SIST EN 912:2012

SLOVENSKI STANDARD
01-januar-2012
1DGRPHãþD
SIST EN 912:2000
SIST EN 912:2000/AC:2002
Vezna sredstva za les - Specifikacije za moznike za les
Timber fasteners - Specifications for connectors for timbers
Holzverbindungsmittel - Festlegungen für Dübel bezonderer Bauart für Holz
Eléments de fixation - Spécifications des connecteurs pour structures en bois
Ta slovenski standard je istoveten z: EN 912:2011
ICS:
21.060.99 Drugi vezni elementi Other fasteners
91.080.20 Lesene konstrukcije Timber structures
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 912
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2011
ICS 21.060.99; 91.080.20 Supersedes EN 912:1999
English Version
Timber fasteners - Specifications for connectors for timbers
Organes d'assemblage pour le bois - Spécifications des Holzverbindungsmittel - Spezifikationen für Dübel
assembleurs pour bois besonderer Bauart für Holz
This European Standard was approved by CEN on 17 June 2011.

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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 912:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .5
4 Symbols .6
5 Requirements .7
5.1 General .7
5.2 Classification and requirements of connectors .7
6 Marking .7
Annex A (normative) Specifications for ring connectors .8
A.1 Type A1 .8
A.1.1 Description and dimensions .8
A.1.2 Material .9
A.2 Type A2 .9
A.2.1 Description and dimensions .9
A.2.2 Material . 10
A.3 Type A3 . 11
A.3.1 Description and dimensions . 11
A.3.2 Material . 12
A.4 Type A4 . 12
A.4.1 Description and dimensions . 12
A.4.2 Material . 14
A.5 Type A5 . 14
A.5.1 Description and dimensions . 14
A.5.2 Material . 16
A.6 Type A6 . 16
A.6.1 Description and dimensions . 16
A.6.2 Material . 18
Annex B (normative) Specifications for plate connectors . 19
B.1 Type B1 . 19
B.1.1 Description and dimensions . 19
B.1.2 Material . 19
B.2 Type B2 . 21
B.2.1 Description and dimensions . 21
B.2.2 Material . 21
B.3 Type B3 . 23
B.3.1 Description and dimensions . 23
B.3.2 Material . 23
B.4 Type B4 . 25
B.4.1 Description and dimensions . 25
B.4.2 Material . 26
Annex C (normative) Specifications for toothed-plate connectors . 27
C.1 Type C1 . 27
C.1.1 Description and dimensions . 27
C.1.2 Material . 28
C.2 Type C2 . 29
C.2.1 Description and dimensions . 29
C.2.2 Material . 30
C.3 Type C3 . 30
C.3.1 Description and dimensions . 30
C.3.2 Material . 32
C.4 Type C4 . 32
C.4.1 Description and dimensions . 32
C.4.2 Material . 34
C.5 Type C5 . 34
C.5.1 Description and dimensions . 34
C.5.2 Material . 35
C.6 Type C6 . 35
C.6.1 Description and dimensions . 35
C.6.2 Material . 36
C.7 Type C7 . 37
C.7.1 Description and dimensions . 37
C.7.2 Material . 38
C.8 Type C8 . 38
C.8.1 Description and dimensions . 38
C.8.2 Material . 39
C.9 Type C9 . 40
C.9.1 Description and dimensions . 40
C.9.2 Material . 41
C.10 Type C10 . 41
C.10.1 Description and dimensions . 41
C.10.2 Material . 43
C.11 Type C11 . 43
C.11.1 Description and dimensions . 43
C.11.2 Material . 44
Annex D (normative) Specifications for other connectors . 46
D.1 Type D1 . 46
D.1.1 Description . 46
D.1.2 Material . 47

Foreword
This document (EN 912:2011) has been prepared by Technical Committee CEN/TC 124 “Timber structures”,
the secretariat of which is held by AFNOR.
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 January 2012, and conflicting national standards shall be withdrawn at
the latest by January 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 912:1999.
The following significant technical changes have been introduced in the new edition of this European
Standard:
a) the EN 912:1999/AC:2000 corrigendum is included,
b) modifications regarding newer EN reference standards, steel material and tolerances.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
1 Scope
This European Standard specifies the dimensions and the materials of certain well-established connectors for
use in joints between members in load-bearing timber structures.
For data on strength and deformation properties of joints made with the connectors, reference is given to
EN 13271.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 1561, Founding — Grey cast irons
EN 1562, Founding — Malleable cast irons
EN 1706, Aluminium and aluminium alloys — Castings — Chemical composition and mechanical properties
EN 10025, Hot rolled products of structural steels (all parts)
EN 10131, Cold rolled uncoated and zinc or zinc-nickel electrolytically coated low carbon and high yield
strength steel flat products for cold forming —Tolerances on dimensions and shape
EN 10139, Cold rolled uncoated mild steel narrow strip for cold forming — Technical delivery conditions
EN 10140, Cold rolled narrow steel strip — Tolerances on dimensions and shape
EN 10143, Continuously hot-dip coated steel sheet and strip — Tolerances on dimensions and shape
EN 10268, Cold rolled steel flat products with high yield strength for cold forming — Technical delivery
conditions
EN 10346, Continuously hot-dip coated steel flat products — Technical delivery conditions
EN 13271, Timber fasteners — Characteristic load-carrying capacities and slip-moduli for connector joints
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
connector
device generally consisting of a plate, toothed-plate or ring which, when partly embedded in each or in one of
the contact faces of two members and held together by a connecting bolt, is capable of transmitting a load
from one member to another
3.2
double-sided connector
connector symmetrical in cross-section and embedded into each contact face of two adjacent timber members
3.3
single-sided connector
connector embedded into a timber contact face only on one side
3.4
ring connector
double-sided connector formed as a closed ring or a ring cut at one place on its circumference
3.5
plate connector
single-sided connector made of a circular plate with a flange along the circumference of one side of the plate
3.6
toothed-plate connector
connector made of a plate with triangular teeth along the edges of the plate or with spikes on the plate; a
toothed-plate connector may be double-sided or single-sided
4 Symbols
In this European Standard, the following symbols are used with suitable subscripts where necessary:
a width of cut; distance; offset distance, in millimetre;
a length of tongue; distance between screw holes, in millimetre;
a depth of tongue; depth of countersink, in millimetre;
a depth of slot, in millimetre;
d diameter of centre hole (bolt-hole), in millimetre;
d diameter of screw holes; diameter of nail holes; diameter of inner teeth circle, in millimetre;
d outside diameter of hub; diameter of outer teeth circle, in millimetre;
d diameter of perforations, in millimetre;
d diameter, diameter of plate;
c
h height of straight portion; height of straight portion outside of flange; height of hub above plate, in
millimetre;
h height; total height, in millimetre;
c
r radius, in millimetre;
t thickness, thickness of plate; maximum thickness of plate and flange, in millimetre;
t minimum thickness of plate; thickness of plate, in millimetre;
t thickness of notch, in millimetre.
5 Requirements
5.1 General
Connectors shall be marked in accordance with Clause 6.
Depending on the environmental conditions the connectors shall be given an anti-corrosion treatment of a
type to be agreed between the purchaser and the manufacturer.
5.2 Classification and requirements of connectors
The connectors are classified into the following four groups:
 Group A Ring connectors; see Annex A;
 Group B Plate connectors; see Annex B;
 Group C Toothed-plate connectors; see Annex C;
 Group D Other connectors; see Annex D.
The annexes A to D specify the dimensions and specifications for materials for these 4 groups.
6 Marking
Every delivery unit shall be marked by the manufacturer. The marking shall contain the number of this
European Standard, i.e. EN 912 and the number of the connector according to the annex to this European
Standard. Furthermore, the nominal dimension (e.g. the nominal diameter) shall be marked.
Annex A
(normative)
Specifications for ring connectors
A.1 Type A1
A.1.1 Description and dimensions
A ring connector of type A1 (see Figure A.1) is a closed ring connector with a cross-sectional area like a lens.
The dimensions shall comply with Table A.1.

Figure A.1 — Connector of type A1
Table A.1 — Dimensions of connectors of type A1
Dimensions in millimetres
Diameter Height Thickness Radius
d h t r
c c
65 30 5 50
80 30 6 50
95 30 6 60
126 30 6 60
128 45 8 60
160 45 10 60
190 45 10 60
Tolerances on all dimensions: ± 0,5.

A.1.2 Material
Ring connectors of type A1 are made of aluminium casting alloy EN AC-AlSi9Cu3(Fe) according to EN 1706.
A.2 Type A2
A.2.1 Description and dimensions
A ring connector of type A2 (see Figure A.2) is a connector with parallel sides cut at one place on its
circumference to form a tongue and a slot. The dimensions shall comply with Table A.2.
Figure A.2 — Connector of type A2
Table A.2 — Dimensions of connectors of type A2
Dimensions in millimetres
Nominal Diameter Height Thickness Length of Depth of Depth of slot
diameter tongue tongue
d h t a a a
c c 1 2 3
64 72,0 19,0 4,1 9,0 6,5 7,0
Tolerances: Diameter d ± 0,75
c
Thickness t ± 0,10
Other dimensions ± 0,25
A.2.2 Material
Ring connectors of type A2 are made of hot or temper rolled steel strip of steel alloy HRMS Grade Fe430
according to EN 10025-1 to -6.
A.3 Type A3
A.3.1 Description and dimensions
A ring connector of type A3 (see Figure A.3) is a connector with double bevelled sides cut at one place on its
circumference to form a tongue and a slot. The dimensions shall comply with Table A.3.

Key
1 round milled edge, radius r
Figure A.3 — Connector of type A3
Table A.3 — Dimensions of connectors of type A3
Dimensions in millimetres
Nominal Diameter Height Thickness Height of Radius Length Depth of Depth of
diameter straight of tongue slot
portion tongue
d h t h r a a a
c c 1 1 2 3
64 72,0 19,0 4,1 6,5 1,5 9,0 6,5 7,0
102 112,0 25,4 4,9 8,3 1,7 9,0 8,3 9,0
Tolerances: Diameter d ± 0,75
c
Thickness t ± 0,10
Other dimensions ± 0,25
A.3.2 Material
Ring connectors of type A3 are made of hot or temper rolled steel strip of steel alloy HRMS Grade Fe430A
according to EN 10025-1 to -6.
A.4 Type A4
A.4.1 Description and dimensions
A ring connector of type A4 (see Figure A.4) is a connector with double bevelled sides. In every connector
except the smallest, a V-shaped cut is made at one place on its circumference. The angle between the
direction of cut and the direction of circumference is 45°. The dimensions shall comply with Table A.4.
Figure A.4 — Connector of type A4
Table A.4 — Dimensions of connectors of type A4
Dimensions in millimetres
Diameter Height Thickness Radius Width of cut
d h t r a
c c
a
60 18 5 36 –
80 22 6 48 2
100 26 7 60 2
120 30 8 72 2
140 36 9 84 4
160 40 10 96 4
180 46 10 108 4
200 50 11 120 4
b +1,0
Limit deviations: Diameter d
c
−0,5
Tolerances: Height h ± 0,5 for h < 36
c c
± 0,7 for h > 40
c
Thickness t ± 0,5 for t < 9
± 0,7 for t >10
Angle 45° ± 1°
a
Without cut.
b
Tolerances on cast ring before splitting.
A.4.2 Material
Ring connectors of type A4 are made of grey cast iron EN-GJL-150 or EN-GJL-200 (Material number:
EN-JL 1020 or EN-JL 1030) according to EN 1561.
A.5 Type A5
A.5.1 Description and dimensions
A ring connector of type A5 (see Figure A.5) is a connector with a rectangular cross-section. It is cut at one
place on its circumference so that the ends are in a V-shape. The dimensions shall comply with Table A.5.
Figure A.5 — Connector type of A5
Table A.5 — Dimensions of connectors of type A5
Dimensions in millimetres
Diameter Height Thickness
d h t
c c
88 20 4
108 24 4
130 27 5
152 30 6
174 33 7
196 36 8
216 40 8
236 45 8
260 50 10
a
Tolerances:    Diameter d + 1,0
c
Height h ± 0,75 for h < 33
c c
± 1,0 for h > 36
c
Thickness t ± 0,5
a
Tolerances on cast ring before splitting.

A.5.2 Material
Ring connectors of type A5 are made of hot rolled steel strip of steel alloy S 235 JR G1 (Material
number: 1.0036) according to EN 100
...