BS EN 1337-7

BRITISH STANDARD
BS EN
1337-7:2004
Structural bearings —
Part 7: Spherical and cylindrical PTFE
bearings
The European Standard EN 1337-7:2004 has the status of a
British Standard
ICS 91.010.30
12&23<,1*:,7+287%6,3(50,66,21(;&(37$63(50,77('%<&23<5,*+7/$:
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BS EN 1337-7:2004
This British Standard was
published under the authority
of the Standards Policy and
Strategy Committee
on 29 December 2006
© BSI 2006
ISBN 0 580 49852 2
National foreword
This British Standard was published by BSI. It is the UK implementation of
EN 1337-7:2004. It supersedes BS EN 1337-7:2001 which is withdrawn. It
partially supersedes BS 5400-9-1:1983 and BS 5400-9-2:1983 which will
remain current until the remaining parts of the BS EN 1337 series have been
published, the last part being Part 8.
The UK participation in its preparation was entrusted to Technical Committee
B/522, Structural bearings.
A list of organizations represented on B/522 can be obtained on request to its
secretary.
This publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immunity from
legal obligations.
Amendments issued since publication
Amd. No. Date Comments
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EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
EN 1337-7
March 2004
ICS 91.010.30 Supersedes EN 1337-7:2000
English version
Structural bearings - Part 7: Spherical and cylindrical PTFE
bearings
Appareils d'appui structuraux - Partie 7: Appareils d'appui
cylindriques sphériques comportant du PTFE
Lager im Bauwesen - Teil 7: Kalotten- und Zylinderlager mit
PTFE
This European Standard was approved by CEN on 2 January 2004.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMI TÉ EUROPÉEN DE NORMALI SATI ON
EUROPÄI SCHES KOMI TEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.
Ref. No. EN 1337-7:2004: E
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EN 1337-7:2004 (E)
2
Contents
page
Foreword......................................................................................................................................................................3
Introduction .................................................................................................................................................................4
1 Scope ..............................................................................................................................................................5
2 Normative references ....................................................................................................................................5
3 Terms and definitions, symbols and abbreviations...................................................................................5
4 Requirements .................................................................................................................................................9
5 Material properties.........................................................................................................................................9
6 Design requirements .....................................................................................................................................9
7 Manufacturing, assembly and tolerances .................................................................................................12
8 Conformity evaluation.................................................................................................................................12
Annex A (informative) Method for calculating the eccentricities in spherical and cylindrical PTFE
bearings ........................................................................................................................................................13
Annex B (informative) Reduced area for curved sliding surfaces .......................................................................15
Annex ZA (informative) Provisions for the CE marking of cylindrical and spherical PTFE bearings (with
or without flat sliding elements) under the EU Construction Products Directive.................................18
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EN 1337-7:2004 (E)
3
Foreword
This document (EN 1337-7:2004) has been prepared by Technical Committee CEN /TC 167, "Structural bearings",
the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by September 2004, and conflicting national standards shall be withdrawn at the
latest by September 2004.
This document has been prepared under a mandate given to CEN by the European Commission and the European
Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.
Annexes A and B are informative.
This document supersedes EN 1337-7:2000.
This European Standard EN 1337 “Structural bearings”, consists of the following 11 Parts:
Part 1: General design rules
Part 2: Sliding elements
Part 3: Elastomeric bearings
Part 4: Roller bearings
Part 5: Pot bearings
Part 6: Rocker bearings
Part 7: Spherical and cylindrical PTFE bearings
Part 8: Guide bearings and restrain bearings
Part 9: Protection
Part 10: Inspection and maintenance
Part 11: Transport, storage and installation
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,
Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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EN 1337-7:2004 (E)
4
Introduction
This standard considers a minimum operating temperature of –35°C.
An extension down to –40°C will be considered in a future amendment.
Applications beyond the range of temperature given in clause 1 need special consideration not covered by this
standard. Characteristics, requirements and test procedures given in this standard do not apply in such cases.
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EN 1337-7:2004 (E)
5
1 Scope
This European Standard deals with the requirements for the design and manufacture of spherical and cylindrical
PTFE bearings. The requirements and properties of the curved sliding surfaces are included in EN 1337-2.
Spherical and cylindrical bearings with an included angle 2 θ > 60° and 2 θ > 75° respectively are beyond the
scope of this European Standard. (see Figure 6).
For the purpose of controlling the degree of freedom the bearings may be combined with flat sliding elements and
guides according to EN 1337-2:2004 and restraining rings as per 6.3.4.
Cylindrical bearings are susceptible to unexpected moments about the transverse axis of the cylindrical surface.
Additional limitation of application to be taken into consideration is given in clause 1 of EN 1337-2:2004.
2 Normative references
This European Standard incorporates, by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 1337-1:2000, Structural bearings - Part 1: General design rules
EN 1337–2:2004, Structural bearings - Part 2: Sliding elements
prEN 1337–5:1996, Structural bearings - Part 5: Pot bearings
3 Terms and definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1.1
backing plate
metallic component which supports sliding materials
3.1.2
cylindrical PTFE bearing
bearing consisting of a backing plate with a convex cylindrical surface (rotational element) and a backing plate with
a concave cylindrical surface between which a PTFE sheet and the mating material form a curved sliding surface
(see Figure 1). Cylindrical PTFE bearings are also used in combination with flat sliding elements and guides to form
free or guided bearings (see Figure 2)
NOTE Numbers in brackets in Figures 1 and 2 refer to the examples shown in Figure 1 of EN 1337-1:2000.
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EN 1337-7:2004 (E)
6
Key
a) Fixed by end stops and sliding surface (7.1)
b) Without end stops for displacements in y direction (7.2)
Figure 1 — Cylindrical PTFE bearings
Key
a) Free for displacements in any direction (7.4)
b) Guided by an internal guide for displacements in x direction (7.3)
c) Guided by external guides for displacements in x direction
Figure 2 — Cylindrical PTFE bearings combined with flat sliding elements
3.1.3
guide
sliding element which restrains a sliding bearing from moving in one axis
3.1.4
lubricant
special grease used to reduce the friction and wear in the sliding surfaces
3.1.5
mating surface
hard smooth metallic surface against which the PTFE slides
3.1.6
polytetrafluoroethylene (PTFE)
thermoplastic material used for its low coefficient of friction
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EN 1337-7:2004 (E)
7
3.1.7
sliding materials
materials which form sliding surfaces
3.1.8
sliding surface
combination of a pair of flat or curved surfaces of different materials which allow relative displacements
3.1.9
spherical PTFE bearing
bearing consisting of a backing plate with a convex spherical surface (rotational element) and a backing plate with
a concave spherical surface between which a PTFE sheet and the mating material form a curved sliding surface
(see Figure 3)
Spherical PTFE bearings are also used in combination with flat sliding elements and guides to form free and
guided bearings (see Figures 4 a) to 4 c)). Spherical PTFE bearings combined with a flat sliding element can be
used together with a restraining ring to form fixed bearings (see Figure 4 d))
NOTE 1 Numbers in brackets in Figures 3 and 4 refer to the examples shown in Figure 1 of EN 1337-1:2000.
NOTE 2 Fixed by sliding surface (3.2).
Figure 3 — Spherical PTFE bearing
Key
a) Free for displacements in any direction (3.5)
b) Guided by an internal guide for displacements in one direction (3.4)
c) Guided by external guides for displacements in one direction (3.3)
d) Fixed by a restraining ring (3.1)
Figure 4 — Spherical PTFE bearings combined with flat sliding elements
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EN 1337-7:2004 (E)
8
3.2 Symbols
The most frequently occurring symbols are defined below. Those that are local, and unique to a particular clause,
are defined at their first appearance.
3.2.1 Latin upper case letters
A contact area of sliding surface; projected area of the curved sliding surface mm
2
L diameter or diagonal of the projected area of the PTFE sheet ............................. mm
Figure 5 — Plan dimensions of spherical and cylindrical bearings
N axial or normal force............................................................................................ N; kN
V lateral or shear force ........................................................................................... N; kN
3.2.2 Latin lower case letters
a minor side of the projection in plan of cylindrical PTFE surfaces ...................... mm
b major side of the projection in plan of cyclindrical PTFE surfaces;
distance from the projected area of the curved sliding surface .......................... mm
c dimension............................................................................................................ mm
d diameter ............................................................................................................. mm
e eccentricity ......................................................................................................... mm
f nominal compressive strength ........................................................................... N/mm
2
h protrusion of PTFE sheet from its recess ........................................................... mm
r radius of curvature .............................................................................................. mm
t thickness ............................................................................................................ mm
x longitudinal axis
y transverse axis
z axis normal to the principal bearing surface
3.2.3 Greek letters
α rotation angle............................................................................................. radians
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EN 1337-7:2004 (E)
9
β deviation angle from vertical axis of the line of action of the
applied load............................................................................................... degrees, radians
∆z maximum deviation of plane or curved sliding surfaces from
theoretical surface .................................................................................... mm
θ half included angle of PTFE curved surfaces ........................................... degrees, radians
λ ratio, coefficient
µ coefficient of friction
σ normal pressure ....................................................................................... N/mm
2
3.2.4 Subscripts
b backing plate
d design value
min minimum
p PTFE
S internal forces and moments from actions
t total
3.3 Abbreviations
PTFE Polytetrafluoroethylene
NDP Nationally Determined Parameters
4 Requirements
4.1 General
Cylindrical PTFE bearings shall permit rotational movements about one axis, spherical PTFE bearings about any
axis. They shall be capable of transferring specified forces between superstructure and substructure.
4.2 Requirements for load bearing capacity
The curved PTFE sheet shall meet the requirements given in 6.2.1 to 6.2.3 and the backing plate with concave
surface those given in 6.3.3.
4.3 Requirements for rotation capability
The sliding surfaces shall meet the requirements given in 6.2.4 and clause 4 of EN 1337-2:2004.
5 Material properties
The materials to be used and the properties to be verified shall be in accordance with clause 5 of EN 1337-2:2004.
6 Design requirements
NOTE This clause gives requirements for the design of components which are specific to spherical and cylindrical bearings
and which are in addition to those given in clause 6 of EN 1337-2:2004.
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EN 1337-7:2004 (E)
10
6.1 Design principles
For design calculations the principles given in clause 5 of EN 1337-1:2000 shall be taken into account.
NOTE The design values of internal forces and moments as well as of movements should be available from a bearing
schedule as shown in annex B of EN 1337-1:2000.
6.2 Design verification for curved sliding surfaces
6.2.1 General
For the purpose of verifications as per 6.2.2 and 6.2.3 the curved sliding surface shall be replaced by its projection
on a plane surface as shown in Figure 6.
Key
1 Projected area
Figure 6 — Verification scheme for the curved sliding surface (example)
Internal forces and moments acting on the curved sliding surface due to frictional resistance, externally applied
horizontal loads and the rotated condition of the bearing shall be taken into account when determining the resulting
total eccentricity e
t
of the axial force N
S
.
Secondary effects due to the action of the restraints shall also be considered.
NOTE In annex A of this standard, formulae are given for the evaluation of the eccentricities in the most common cases.
The frictional resistance shall be determined using the coefficients of friction given in Table 11 of EN 1337-2:2004.
6.2.2 Separation of sliding surfaces
NOTE Separation of the sliding surfaces may lead to wear due to contamination and increased deformation due to lack of
confinement. As this could endanger long term fitness for use, the condition σ
p
= 0 is considered as serviceability limit state.
It shall be verified that σ
p
≥ 0 under the characteristic combination of actions. In doing so the sliding material shall
be assumed to be linear elastic and the backing plates shall be deemed to be rigid. The condition σ
p
≥ 0 is satisfied
when the total eccentricity e
t
falls within the kernel of the projected area.
For spherical bearings this condition is satisfied when:
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EN 1337-7:2004 (E)
11
Dimension L is shown in Figure 5.
6.2.3 Compressive stress verification
NOTE 1 Excessive pressure may cause loss of the sliding function and this may lead to structural failure or states close to
structural failure. Therefore this condition is considered as ultimate limit state.
The following conditions shall be verified under a fundamental combination of actions:
where
N
Sd
is the design axial force at ultimate limit state
f
k
characteristic value of compressive strength for PTFE sheets (see Table 10 of EN 1337-2:2004)
A
r
is the reduced contact area of the curved sliding surface
NOTE 2 The γm value should be given in NDP. Recommended value is γm = 1,4 (see clause 6.8.3 of EN 1337-2:2004).
The reduced area A
r
is given by the formula:
A
r
= λ×A
where
A is the area of the projected curved sliding surface (see Figure 6)
λ is a coefficient given in annex B
6.2.4 Rotation capability
Under the fundamental combination of actions it shall be shown that
 the metallic surfacing mating with the PTFE material is so proportioned that it completely covers the PTFE
sheet,
 there is no contact between the upper and the lower part of the bearing or any other metallic component (see
EN 1337-1:2000, annex A).
For the verification of the above conditions the increase of rotation, specified in clause 5.4 of EN 1337-1:2000, shall
be taken into account.
) 2 (
r
m
k
Sd
A
f
N × ≤
γ
) 1 (
8
L
e
t
≤
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EN 1337-7:2004 (E)
12
6.3 Design details
6.3.1 General
For basic design features clause 7 of EN 1337-1:2000 applies.
The permissible material combinations of curved sliding surfaces are given in Table 9 of EN 1337-2:2004.
6.3.2 Curved PTFE sheet
The curved PTFE sheet may be attached to either the convex or the concave backing plate.
The design details of curved PTFE sheet shall be in accordance with 6.2.1 of EN 1337-2:2004.
6.3.3 Backing plates with concave surfaces
For cylindrical and spherical bearings, backing plates with concave surfaces shall be verified in accordance with
6.9 of EN 1337-2:2004.
Dimensional limitations of backing plates with concave surfaces are shown in Figure 7.
Figure 7 — Dimensional limitations of a backing plate with a concave surface.
6.3.4 Restraining ring
Free spherical bearings (see Figure 4 a)) may be fixed by a steel restraining ring as shown in Figure 4 d).
For design and verification, the design rules for pot and piston of pot bearings given in clause 6 of prEN 1337-
5:1996 shall be followed.
7 Manufacturing, assembly and tolerances
Requirements for flat and curved sliding surfaces are given in clause 7 of EN 1337-2:2004.
Protrusion “h” of curved PTFE sheets shall be measured as shown in Figure 2 of EN 1337-2:2004.
8 Conformity evaluation
Conformity to this Part shall be demonstrated in accordance with relevant subclauses of clause 8 of EN 1337-
2:2004. The given systems of attestation of conformity (see ZA.2) are also valid for non-serial productions.
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EN 1337-7:2004 (E)
13
AnnexA
(informative)
Method for calculating the eccentricities in spherical and cylindrical PTFE
bearings
A.1 General
Frictional forces, forces from applied horizontal loads and the rotated condition of the bearing produce eccentricity
of the axial force N
S
, which is used in the verification of PTFE sheets, the adjacent structural members and the
anchoring devices.
This annex gives methods for calculating the significant eccentricities.
Depending on the design features of a particular bearing, additional eccentricities may exist.
When several eccentricities occur in a cross-section under consideration, they need to be added.
A.2 Friction resistance
A.2.1 Curved sliding surfaces
In the presence of rotational movements, in both cylindrical and spherical bearings, an internal moment occurs due
to the frictional resistance.
Regardless of whether the bearing has one or two surfaces, the associated eccentricity e
1
is:
e
1
= µ
max
× r (A.1)
The coefficient of friction µ
max
is given in Table 11 of EN 1337-2:2004.
A.2.2 Sliding surfaces with external guides and restraining rings
For the spherical bearings of the type shown in Figures 4 c) and 4 d), rotational movements produce an
eccentricity which affects only the adjacent structural members (i.e. plinth, beam etc) and the anchoring devices,
where:
For the bearing of the type shown in Figure 4 c), the coefficient of friction µ
max
is given in 6.7 of EN 1337-2:2004.
For the bearing of type shown in Figure 4 d), µ
max
should be assumed to be 1,0.
(A.2) c ì
N
1
e
ma\
s
s
2
× × =
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EN 1337-7:2004 (E)
14
A.3 Rotation
In all the types of bearings with two sliding surfaces as in Figures 2 a), b), c) and 4 a) b), c), d), a rotation angle α
produces an eccentricity e
3
of the vertical load on the curved surface equal to:
e
3
= α × (r + b) (A.3)
where
b represents the distance between the cross-section under consideration and the sliding surface (see Figure 6).
At any rate, this eccentricity acts nonetheless in the opposite direction to that given under A.2.
The occurrence of e
3
depends on whether the curved PTFE sheet is either attached to the convex or concave
backing plate and whether the value α is greater or lesser than µ as well as on whether the bearing clearance is
performing its function effectively in the case of guided bearings.
Because of the uncertainty concerning the actual values of α and µ as well as the effect bearing clearance can
entail, it is suggested that e
3
should in any case be taken into account since a precise analysis cannot be carried
out.
In the type of bearings equipped with only one sliding surface as the ones shown in Figures 1 and 3, e
3
occurs only
in the curved PTFE sheet and, furthermore, only when said sheet is attached to the convex backing plate.
A.4 Lateral forces
Lateral forces result from horizontal actions and the friction resistance of the other bearings in the structure.
In bearings where lateral forces are transmitted by guides or restraining rings, the eccentricity in the curved sliding
surface is equal to zero.
In bearings of the fixed type with only one sliding surface as in Figures 1 and 3 and in the guided spherical bearing
as in Figure 4 b), the horizontal load V
s
produces an eccentricity given by (see Figure 6):
In all cases where the lines of application of lateral action and reaction are not coincident (see e.g. Figure 2 b)) the
resulting couple causes an eccentricity that shall be additionally taken into account.
( ) (/.4) b r
N
V
e
S
S
+ × =
4
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EN 1337-7:2004 (E)
15
AnnexB
(informative)
Reduced area for curved sliding surfaces
B.1 General
This annex gives the values of the coefficient λ used in 6.2.3 for the calculation of the reduced area A
r
of curved
sliding surfaces.
B.2 Modelling assumptions
The values of the coefficient λ have been calculated by means of a mathematical model made with the following
assumptions:
1) only compressive stresses are transmitted;
2) the stresses in the compressed area are constant and equal to the design value f
d
of compressive resistance
of PTFE sheets (i.e. the stress block theory is adopted);
3) stresses are always normal to the contact surface: a conservative hypothesis justified by the low coefficient of
friction of PTFE in contact with polished metal surfaces;
4) both concave and convex backing plates are perfectly rigid; a conservative hypothesis justified by the fact that
steel's elastic modulus is at least 5 000 times greater than that of PTFE.
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EN 1337-7:2004 (E)
16
Table B.1 - Coefficient λ for spherical bearings
θ
e/L
30° 25° 20° 10°
0,00 1,000 1,000 1,000 1,000
0,01 0,982 0,981 0,980 0,979
0,02 0,962 0,961 0,960 0,958
0,03 0,942 0,940 0,938 0,936
0,04 0,922 0,919 0,916 0,913
0,05 0,901 0,898 0,894 0,890
0,06 0,880 0,876 0,872 0,867
0,07 0,858 0,853 0,849 0,844
0,08 0,836 0,831 0,826 0,820
0,09 0,814 0,808 0,803 0,796
0,10 0,792 0,786 0,780 0,773
0,11 0,770 0,763 0,757 0,749
0,12 0,747 0,740 0,733 0,724
0,13 0,725 0,717 0,710 0,700
0,14 0,702 0,693 0,686 0,676
0,15 0,680 0,670 0,663 0,653
0,16 0,657 0,647 0,639 0,628
0,17 0,635 0,624 0,616 0,604
0,18 0,612 0,601 0,592 0,581
0,19 0,590 0,578 0,569 0,557
0,20 0,567 0,556 0,546 0,533
0,21 0,545 0,533 0,523 0,510
0,22 0,523 0,511 0,500
0,23 0,501
0,24
0,25
NOTE Intermediate values may be obtained by linear interpolation.
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EN 1337-7:2004 (E)
17
Table B.2 - Coefficient λ for cylindrical bearings
θ
e/L
37,5° 30° 20° 10°
0,00 1,000 1,000 1,000 1,000
0,01 0,984 0,983 0,981 0,980
0,02 0,968 0,965 0,962 0,961
0,03 0,951 0,947 0,943 0,941
0,04 0,934 0,929 0,924 0,921
0,05 0,917 0,911 0,905 0,901
0,06 0,900 0,893 0,886 0,881
0,07 0,882 0,874 0,866 0,862
0,08 0,864 0,855 0,847 0,842
0,09 0,846 0,837 0,827 0,822
0,10 0,828 0,818 0,808 0,802
0,11 0,809 0,799 0,788 0,782
0,12 0,790 0,779 0,768 0,762
0,13 0,771 0,760 0,749 0,742
0,14 0,752 0,740 0,729 0,722
0,15 0,733 0,721 0,709 0,702
0,16 0,713 0,701 0,689 0,682
0,17 0,693 0,681 0,669 0,662
0,18 0,673 0,661 0,649 0,642
0,19 0,653 0,641 0,629 0,622
0,20 0,633 0,621 0,609 0,602
0,21 0,612 0,600 0,589 0,582
0,22 0,592 0,580 0,569 0,562
0,23 0,571 0,559 0,548 0,542
0,24 0,550 0,539 0,528 0,522
0,25 0,529 0,518 0,508 0,502
NOTE Intermediate values may be obtained by linear interpolation.
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EN 1337-7:2004 (E)
18
AnnexZA
(informative)
Provisions for the CE marking of cylindrical and spherical PTFE bearings
(with or without flat sliding elements) under the EU Construction Products
Directive
ZA.1 Clauses of this European Standard addressing the essential characteristics of the
EU Construction products Directive
This European Standard has been prepared under a mandate
1
given to CEN by the European Commission and the
European Free Trade Association.
The clauses of this European Standard, shown in the Table ZA.1 below, meet the requirements of the mandate
given under EU Construction Products Directive (89/106/EEC).
Compliance with these clauses confers a presumption of fitness of the construction products covered by this
European Standard and intended uses given below.
WARNING: Other requirements and other EU Directives, not affecting the fitness for intended uses, can be
applicable to the structural bearings within the scope of this annex.
Note:
In addition to any specific clauses relating to dangerous substances contained in this Standard, there may be
other requirements applicable to the products falling within its scope (e.g. transposed European legislation and
national laws, regulations and administrative provisions). In order to meet the provisions of the EU Construction
Products Directive, these requirements need also to be complied with, when and where they apply. An
informative database of European and national provisions on dangerous substances is available at the
Construction web site on EUROPA (CREATE, accesses through
http://europa.eu.int/comm/enterprise/construction/internal/dangsub/dangmain.htm).
Tables ZA.1 - Scope and relevant clauses
Table ZA.1.a
Construction Products: Cylindrical and spherical PTFE bearings (Figures 1 and 3) covered by the
scope of this standard
Intended uses: In buildings and civil engineering works
Requirements
Requirement clause(s) in this and other
European Standard(s):
Mandated level(s) or
class(es):
Notes:
Load bearing capacity
EN 1337-7, 4.2 , 5, 6.2.1, 6.2.2, 6.2.3,
6.3.2, 6.3.3, 6.3.4, 7
None
Design value,
in kN
Rotation capability EN 1337-7, 4.3, 5, 6.2.4, 6.3.1, 7 None
Design value,
in radians
Durability aspects
EN 1337-7, clause 7
EN 1337-9, clause 4
None

1
M/104 "Structural bearings" as amended by M/132 (anti-seismic devices are covered by CEN/TC 340)
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EN 1337-7:2004 (E)
19
Table ZA.1.b
Construction Products: Cylindrical and spherical PTFE bearings combined with flat sliding elements
(Figures 2 and 4) covered by the scope of this standard
Intended uses: In buildings and civil engineering works
Requirements
Requirement clause(s) in this and other
European Standard(s):
Mandated level(s) or
class(es):
Notes:
Load bearing capacity EN 1337-7, 4.2, 5, 6.2.1, 6.2.2, 6.2.3,
6.3.2, 6.3.3, 6.3.4, 7
None Design value,
in kN
Rotation capability EN 1337-7, 4.3, 5, 6.2.4, 6.3.1, 7 None Design value,
in radians
Durability aspects EN 1337-7, clause 7
EN 1337-9, clause 4
None
Load bearing capacity
(of sliding element)
EN 1337-2:2004, 5, 6.2, 6.3, 6.4, 6.6, , 6.8,
6.9, 7.1, 7.2
None Design value,
in kN
Coefficient of friction
(of sliding element)
EN 1337-2:2004, 4, 5, 6.1, 6.5, 6.7, 7.5 None Tabulated
value (Table
11)
Durability aspects (of
sliding element)
EN 1337-2:2004, 7.3, 7.4
EN 1337-9, clause 4
None
The requirement on a certain characteristic is not applicable to those Member States where there are no
regulations for such characteristic. In this case, manufacturers willing to place their products in the market of these
Member States are not obliged to determine nor to declare the performance of their products with regard to this
characteristic and the option "no performance determined" in the information accompanying the CE mark (see
ZA.3) may be used.
The “No performance determined” (NPD) option may not be used where the characteristic is subject to a threshold
level.
ZA.2 Procedures for attestation of conformity
a) For the products and intended uses listed in Table ZA.1.a) and ZA.1.b) in accordance with the European
Commission Decision 95/467/EC of 24/10/1995 the systems of attestation of conformity are the following:
Table ZA.2 - Attestation of conformity systems
Product Intended use(s)
Level(s) or
class(es)
Attestation of
conformity
systems
In buildings and civil engineering works
where requirements on individual bearings
are critical
a
1
Structural bearings
In buildings and civil engineering works
where requirements on individual bearings
are not critical
b
None
3
System 1: See annex III.2.(i), without audit testing of samples
System 3: See annex III.2.(ii), second possibility
a
Critical in the sense that those requirements may, in case of failure of the bearing, put the works or parts
thereof in states beyond those regarded as serviceability and ultimate limit states.
b
Not critical in the sense that those requirements may not, in case of failure of the bearing and under normal
circumstances, put the works or parts thereof in states beyond those regarded as serviceability and ultimate
limit states.
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EN 1337-7:2004 (E)
20
b) The evaluation of conformity of cylindrical and spherical PTFE bearings; within the given systems of attestation
of conformity shall be based on evaluation of conformity clauses of clause 8 of EN 1337-7 indicated in Tables
ZA.3.a) and ZA.3.b)
Table ZA.3.a) - Assignation of tasks for the attestation of conformity of cylindrical and spherical PTFE
bearings intended to be subject to critical requirements
Tasks Content of the task Clauses to apply
Factory production control
(F.P.C)
Parameters related to all
characteristics of Table ZA.1 a)
EN 1337-7, clause 8 (only
8.2.1, 8.2.3, 8.3, 8.4 of EN
1337-2:2004) Tasks for the
manufacturer Further testing of samples
taken at factory, where
relevant
All characteristics of
Table ZA.1 a)
EN 1337-7, clause 8 (only
8.2.1, 8.4 of EN 1337-
2:2004)
Initial type testing
All characteristics of
Table ZA.1 a)
EN 1337-7, clause 8 (only
8.2.1, 8.2.2, 8.4 of EN
1337-2:2004)
Initial inspection of factory
and of F.P.C
Parameters related to all
characteristics of Table ZA.1 a)
EN 1337-7, clause 8 (only
8.2.1, 8.2.3 of EN 1337-
2:2004)
Tasks for the
notified body
Continuous surveillance,
assessment and approval
of F.P.C.
Parameters related to all
characteristics of Table ZA.1 a)
EN 1337-7, clause 8 (only
8.2.1, 8.2.3, 8.3, 8.4 of EN
1337-2:2004)
Table ZA.3.b) - Assignation of tasks for the attestation of conformity of cylindrical and spherical PTFE
bearings intended to be subject to non critical requirements
Tasks Content of the task Clauses to apply
Tasks for the
manufacturer
Factory production control
(F.P.C)
Parameters related to all
characteristics of
Table ZA.1.a)
EN 1337-7, clause 8
(only 8.2.1, 8.2.3, 8.3, 8.4
of EN 1337-2:2004)
Tasks for the
notified body
Initial type testing
All characteristics of
Table ZA.1.a)
EN 1337-7, clause 8
(only 8.2.1, 8.2.2, 8.4 of
EN 1337-2:2004)
c) The evaluation of conformity of cylindrical and spherical PTFE bearings with flat sliding elements within the given
systems of attestation of conformity shall be based on the evaluation of conformity clauses of chapter 8 of EN
1337-7 and EN 1337-2:2004 indicated in Tables ZA.3.c) and ZA.3.d)
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EN 1337-7:2004 (E)
21
Table ZA.3.c) - Assignation of tasks for the attestation of conformity of cylindrical and spherical PTFE
bearings combined with flat sliding elements intended to be subject to critical requirements
Tasks Content of the task Clauses to apply
Factory production control
(F.P.C)
Parameters related to all
characteristics of Table ZA.1 b)
EN 1337-7, clause 8 as
in/and
EN 1337-2:2004, 8.2.1,
8.2.3, 8.3, 8.4
Tasks for the
manufacturer
Further testing of samples
taken at factory, where
relevant
All characteristics of
Table ZA.1 b)
EN 1337-7, clause 8 as
in/and
EN 1337-2:2004, 8.2.1, 8.4
Initial type testing
All characteristics of
Table ZA.1 b)
EN 1337-7, clause 8 as
in/and
EN 1337-2:2004, clauses
8.2.1, 8.2.2, 8.4
Initial inspection of factory
and of F.P.C
Parameters related to all
characteristics of Table ZA.1 b)
EN 1337-7, clause 8 as
in/and
EN 1337-2:2004, 8.2.1,
8.2.3, 8.3, 8.4
Tasks for the
notified body
Continuous surveillance,
assessment and approval
of F.P.C.
Parameters related to all
characteristics of Table ZA.1 b)
EN 1337-7, clause 8 as
in/and
EN 1337-2:2004, 8.2.1,
8.2.3, 8.3, 8.4
Table ZA.3.d) - Assignation of tasks for the attestation of conformity of cylindrical and spherical PTFE
bearings combined with flat sliding elements intended to be subject to non critical requirements
Tasks Content of the task Clauses to apply
Tasks for the
manufacturer
Factory production control
(F.P.C)
Parameters related to all
characteristics of
Table ZA.1 b)
EN 1337-7, clause 8 as
in/and
EN 1337-2:2004, 8.2.1,
8.2.3, 8.3, 8.4
Tasks for the
notified body
Initial type testing
All characteristics of
Table ZA.1 b)
EN 1337-7, clause 8 as
in/and
EN 1337-2:2004, 8.2.1,
8.2.2, 8.4
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EN 1337-7:2004 (E)
22
d) EC Certificate and declaration of conformity
When compliance with the system of attestation of conformity is achieved:
a) for bearings under system 1, the certification body shall draw up a certificate of conformity (EC Certificate of
conformity) with the information indicated below. This EC Certificate of conformity entitles the manufacturer to affix
the CE marking, as described in ZA.3.
The EC Certificate of conformity shall include the following information:
• Name, address and identification number of certification body,
• Name and address of the manufacturer, or his authorised representative established in the EEA and place
of production,
• Description of the product (type, identification, use,...),
• Provisions to which the product conforms (e.g. annex ZA of EN 1337-7),
• Particular conditions applicable to the use of the product (e.g. provisions for the use of a bearing under
certain conditions, etc),
• The certificate’s number,
• Conditions and period of validity of the certificate,
• Name of, and position held by, the person empowered to sign the certificate.
In addition, for each product covered by an EC Certificate of conformity, the manufacturer shall draw up a
declaration of conformity (EC Declaration of conformity) including the following information:
- Name and address of the manufacturer, or his authorised representative established in the EEA,
- Number of the attached Certificate of factory production control,
- Name of, and position held by, the person empowered to sign the declaration on behalf of the
manufacturer or of his authorised representative.
Both documents shall be presented in the official language or languages of the Member State of the EU in which
the product is to be used.
b) For bearings under system 3, the manufacturer shall draw up a declaration of conformity (EC Declaration of
conformity) including the following information:
• Name and address of the manufacturer, or his authorised representative established in the EEA and place
of production,
• Description of the product (type, identification, use,...),
• Provisions to which the product conforms (e.g. annex ZA of EN 1337-7),
• Particular conditions applicable to the use of the product (e.g. provisions for the use of a bearing under
certain conditions, etc),
• Name and address of the approved laboratory that carried out the initial type tests,
• Name of, and position held by, the person empowered to sign the declaration on behalf of the manufacturer
or of his authorised representative.
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EN 1337-7:2004 (E)
23
This EC Declaration of conformity entitles the manufacturer to affix the CE marking, as described in ZA.3.
This document shall be presented in the official language or languages of the Member State of the EEA in which
the product is to be used.
ZA.3 CE marking
Regardless of the requirements stated in 7.3 of EN 1337-1:2000, the CE mark, the identification number of the
certification body and the name or identifying mark and registered address of the manufacturer should be affixed
on the bearing so that it will be visible throughout the life of the bearing. The full information given below should be
in the relevant accompanying documents.
The CE conformity mark, consists exclusively of the letters “CE” in the specified form of the Directive 93/68/EC and
the identification number of the notified body, where relevant.
CE marking for structural bearing products shall be accompanied by the information shown below:
- Identification number of the certification body (only for products under system 1);
- Name or identifying mark of the producer;
- Registered address of the producer;
- The last two digits of the year in which the marking is affixed;
- Number of the EC Certificate of conformity (only for products under system 1);
- Reference to this European Standard;
- Description of the product: generic name, material, dimensions,.. and intended use;
- Declaration of characteristics related to the mandated requirements;
- Values and, where relevant, level or class to declare for each mandated characteristic as indicated in "Notes" in
Table ZA.1.
As an alternative, where possible, standard designation may be given. This designation should give information on
all the characteristics, if all are not covered, then values for those not covered shall be additionally given.
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EN 1337-7:2004 (E)
24
As example, for cylindrical and spherical PTFE bearings combined with flat sliding elements under system 1, the
following information shall accompany the CE marking symbol:
0123-CPD-0001
CE conformity marking, consisting of
the “CE”-symbol given in Directive
93/68/EEC.
Identification number of the
certification body
Any Co Ltd, PO Box 21, B-1050
00
0123-CPD-0456
EN 1337-7:2004
Cylindrical PTFE bearing combined with flat
sliding element / Spherical PTFE bearing
combined with flat sliding element, for minimum
operating temperature of -35
O
C, for uses in
buildings and civil engineering works where
requirements on individual bearings are critical
BEARING
Characteristic load bearing capacity, in kN
Characteristic rotation capability, in radians
Durability, conforming
SLIDING ELEMENT
Characteristic load bearing capacity, in kN
Coefficient of friction, conforming
Durability, conforming
Name or identifying mark and
registered address of the
manufacturer
The last two digits of the year in
which the marking was affixed
Number of the EC certificate of
conformity
No. of European Standard
Identification of product and
intended use
And
Information on mandated
characteristics
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EN 1337-7:2004 (E)
25
As example, for cylindrical and spherical PTFE bearings under system 3, the following information shall accompany
the CE marking symbol:
CE conformity marking, consisting of
the “CE”-symbol given in directive
93/68/EEC.
Any Co Ltd, PO Box 21, B-1050
00
EN 1337-7:2004
Cylindrical PTFE bearing / Spherical PTFE
bearing, for minimum operating temperature of -
35
O
C, for uses in buildings and civil engineering
works where requirements on individual
bearings are not critical
BEARING
Characteristic load bearing capacity, in kN
Characteristic rotation capability, in radians
Durability, conforming
Name or identifying mark and
registered address of the
manufacturer
The last two digits of the year in
which the marking was affixed
No. of European Standard
Identification of product and
intended use
And
Information on mandated
characteristics
In addition to any specific information relating to dangerous substances shown above, the product should also
be accompanied, when and where required and in the appropriate form, by documentation listing any other
legislation on dangerous substances for which compliance is claimed, together with any information required by
that legislation. Note: European legislation without national derogations need not be mentioned.
Copyright British Standards Institution
Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Kellogg Brown & Root/3262700001
Not for Resale, 05/28/2008 01:41:39 MDT No reproduction or networking permitted without license from IHS
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BS EN
1337-7:2004
BSI
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Copyright British Standards Institution
Provided by IHS under license with BSI - Uncontrolled Copy Licensee=Kellogg Brown & Root/3262700001
Not for Resale, 05/28/2008 01:41:39 MDT No reproduction or networking permitted without license from IHS
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