1、October 2011 Translation by DIN-Sprachendienst.English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS
2、 21.060.10; 97.220.20!$tux“1818285www.din.deDDIN ISO 7794Cross-country skis Ski-binding screws Requirements (ISO 7794:2011)English translation of DIN ISO 7794:2011-10Langlaufski Skibindungsschrauben Anforderungen (ISO 7794:2011)Englische bersetzung von DIN ISO 7794:2011-10Skis de fond Vis de fixatio
3、n Exigences (ISO 7794:2011)Traduction anglaise de DIN ISO 7794:2011-10SupersedesDIN ISO 7794:1992-04www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.9 09.11 A comma is used as the decimal marker. Contents Page National foreword .3 N
4、ational Annex NA (informative) Bibliography.3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions5 4 Designation 6 5 Requirements .6 5.1 General6 5.2 Materials .6 5.3 Dimensions.6 5.3.1 Screw head .6 5.3.2 Thread and tip configuration 6 5.4 Surface8 5.5 Application characteris
5、tics .8 5.5.1 General8 5.5.2 Strength requirements 8 5.5.3 Fastening characteristics8 Bibliography 9 2 DIN ISO 7794:2011-10 National foreword This standard has been prepared by Technical Committee ISO/TC 83 “Sports and recreational equipment” (Secretariat: DIN, Germany). The responsible German body
6、involved in its preparation was the Normenausschuss Sport- und Freizeitgert (Sports Equipment Standards Committee), Working Committee NA 112-03-01 AA Ski- und Snowboardsport-gerte. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. D
7、IN and/or DKE shall not be held responsible for identifying any or all such patent rights. This third edition cancels and replaces the first edition (DIN ISO 7794:1992-04), which has been technically revised. The DIN Standards corresponding to the International Standards referred to in this document
8、 are as follows: ISO 1478 DIN EN ISO 1478 ISO 2702 DIN EN ISO 2702 ISO 4042 DIN EN ISO 4042 ISO 4757 DIN EN ISO 4757 ISO 7795 DIN ISO 7795 Amendments This standard differs from DIN ISO 7794:1992-04 as follows: a) Subclause 5.2 “Materials” has been added; b) in Subclause 5.3.2, the requirements for t
9、he thread and tip configuration have been revised and the drawing of the screw has been adopted from DIN ISO 10228. Previous editions DIN ISO 7794: 1985-05, 1992-04 National Annex NA (informative) Bibliography DIN EN ISO 1478, Tapping screw thread DIN EN ISO 2702, Heat-treated steel tapping screws M
10、echanical properties DIN EN ISO 4042, Fasteners Electroplated coatings DIN EN ISO 4757, Cross recesses for screws DIN ISO 7795, Cross-country skis Ski-binding screws Test methods 3 DIN ISO 7794:2011-10 Introduction The use of ski-binding screws that comply with the requirements of this International
11、 Standard will improve binding mounting. By standardizing the drill hole diameter, recommendations by the manufacturers will no longer be required, while mistakes and improper mounting, caused by differences in instructions, will be avoided. Standardization of the penetration depth will enable ski m
12、anufacturers to design their products so that there will be sufficient thickness in the mounting area and suitable positioning of reinforced parts to make optimum use of the fastening characteristics. The proposed values for driving torque and stripping torque will enable adjustable torque-limiting
13、screwdrivers to be used with the same adjustment for all skis. The use of the cross-recess type Z No. 3 screw will also contribute significantly to simplifying the binding mounting procedure. Cross-country skis Ski-binding screws Requirements 4 DIN ISO 7794:2011-10 1 Scope This International Standar
14、d specifies the dimensions, mechanical properties, mounting and fastening characteristics of screws used for mounting ski bindings on cross-country skis. The purpose of this International Standard is to facilitate the design of a more rational and safer binding mounting system. 2 Normative reference
15、s 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. ISO 1478, Tapping screws thread ISO 2702, Heat-
16、treated steel tapping screws Mechanical properties ISO 7795, Cross-country skis Ski-binding screws Test methods 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 ski-binding screw fastener which, after mounting, ensures the connection of bindin
17、g and ski by axial pre-tension 3.2 penetration depth distance from the top surface of the ski to the lower extremity of the ski-binding screw 3.3 driving torque maximum value of the moment required to drive the ski-binding screw into the drill hole of the test specimen without lubrication or tapping
18、 3.4 tightening torque moment, specified in the mounting instructions or in the test procedure, which is used to tighten the ski-binding screw to ensure sufficient fastening 3.5 stripping torque maximum measurable moment which causes damage to the internal thread in the test assembly, or to the thre
19、ad of the screw if the already tightened screw is further loaded by a driving moment 5 DIN ISO 7794:2011-10 3.6 static pull-out resistance resistance of the test assembly to a pull-out force applied to one screw quasistatically in the axial direction 4 Designation Cross-country ski-binding screws in
20、 accordance with this International Standard shall be designated by: a) the words “cross-country ski-binding screws”, and the abbreviation “XCSBS”; b) the reference of this International Standard, i.e. ISO 7794; c) their nominal dimensions, i.e. diameter length; d) the type of screw head. EXAMPLE Cr
21、oss-country ski-binding screws of nominal diameter 6,0 mm and length 17 mm, with countersunk heads would be designated: Cross-country ski-binding screws XCSBS ISO 7794 6,0 17 with countersunk heads 5 Requirements 5.1 General The strength requirements and typical application characteristics of cross-
22、country ski-binding screws are tested in accordance with ISO 7795. 5.2 Materials Cross-country ski-binding screws shall be made of steel as specified in ISO 2702, which shall comply with the additional requirements in 5.4 and 5.5 of this International Standard. 5.3 Dimensions 5.3.1 Screw head Cross-
23、country ski-binding screws shall be cross recess type Z No. 3 with a recommended minimum penetration depth of 2,72 mm to 3,18 mm (see ISO 4757). If screws having countersunk heads are used, the angle of countersinking 2090+ is recommended. 5.3.2 Thread and tip configuration The cross-section of the
24、screw may be circular or non circular within the major diameter of 00,156,3 mm mm(see Figure 1). The tolerance shall be in accordance with Figure 1. The thread should be extended up to the screw head but shall be at least 1 mm longer than the penetration depth. The shaft end shall correspond to Figu
25、re 1. 6 DIN ISO 7794:2011-10 Dimensions in millimetres aCross-recess type Z No. 3 in accordance with ISO 4757. bPitch. Figure 1 Thread and end configuration 7 DIN ISO 7794:2011-10 5.4 Surface Ski-binding screws shall be coated or plated with materials which provide adequate protection against corros
26、ion and ensure a reproducible coefficient of friction. For example, a suitable coating would be a zinc electroplated coating, Fe/Zn 5c (see ISO 4042), having a clear chromate conversion coating and a minimum local thickness of 5 m (batch average 4 m min., 6 m max.), when measured on the top surface
27、of the screw head. During electroplating, adequate precautions shall be taken to avoid hydrogen embrittIement. 5.5 Application characteristics 5.5.1 General The specified fastening and mounting characteristics of the screw shall be based on a uniform drill diameter of 0,1503,6 mm mm.+5.5.2 Strength
28、requirements The screw head shall not be damaged when submitted to the following torques: a) a driving torque of not more than 2 Nm; b) a stripping torque of not less than 3,5 Nm. 5.5.3 Fastening characteristics The mean static pull-out resistance shall correspond to at least that of a reference screw complying with the requirements of ISO 1478, type F, and having a diameter of 6,3 mm. 8 DIN ISO 7794:2011-10 Bibliography 1 ISO 4042, Fasteners Electroplated coatings 2 ISO 4757, Cross recesses for screws 9 DIN ISO 7794:2011-10
