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1、BRITISH STANDARD BS EN ISO 898-6:1996 Mechanical properties of fasteners Part 6: Nuts with specified proof load values Fine pitch thread The European Standard EN ISO 898-6:1995 has the status of a British Standard ICS 21.060.20 BS EN ISO 898-6:1996 This British Standard, having been prepared under t
2、he direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1996 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference FME/9 Draft for comment 93/702772 DC ISBN 0 580 25496 8 Comm
3、ittees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee FME/9, Bolts, nuts and accessories, upon which the following bodies were represented: BEAMA Ltd. British Constructional Steelwork Association Ltd. British Industrial Fasteners F
4、ederation British Steel Industry British Steel Industry (Wire Section) Gauge and Tool Makers Association National Association of Fastener Stockholders Society of Motor Manufacturers and Traders Ltd. Washer Manufacturers Association of Great Britain The following bodies were also represented in the d
5、rafting of the standard, through subcommittees and panels: British Turned-parts Manufacturers Association Institute of Metal Finishing Metal Finishing Association Stainless Steel Fabricators Association of Great Britain National Centre of Tribology Amendments issued since publication Amd. No.DateCom
6、ments BS EN ISO 898-6:1996 BSI 12-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 1Scope3 2Normative references3 3Designation system4 4Materials5 5Mechanical properties5 6Proof load values5 7Failure loads for nuts with nominal heights of U 0.5d and 16 mm ma
7、y be quenched and tempered at the discretion of the manufacturer. EN ISO 898-6:1995 BSI 12-19997 Table 6 Proof load values Thread Nominal stress area of mandrel Property class 04055681012 d PAsProof load (As Sp) N mm2style 1style 1style 1style 2style 1style 2style 2 M8 139,214 90019 60027 00030 2003
8、7 40034 90043 10041 40047 000 M10 164,524 50032 20044 50049 70061 60057 40071 00068 00077 400 M10 1,2561,223 30030 60044 20047 10058 40054 50067 30064 60073 400 M12 1,2592,135 00046 00063 50071 80088 00082 000102 20097 200110 500 M12 1,588,133 50044 00060 80068 70084 10078 40097 80092 900105 700 M14
9、 1,512547 50062 50086 30097 500119 400111 200138 800131 900150 000 M16 1,516763 50083 500115 200130 300159 500148 600185 400176 200200 400 M18 1,521581 700107 500154 800187 000221 500232 200 M18 220477 500102 000146 900177 500210 100220 300 M20 1,5272103 400136 000195 800236 600280 200293 800 M20 22
10、5898 000129 000185 800224 500265 700278 600 M22 1,5333126 500166 500239 800289 700343 000359 600 M22 2318120 800159 000229 000276 700327 500343 400 M24 2384145 900192 000276 500334 100395 500414 700 M27 2496188 500248 000351 100431 500510 900535 700 M30 2621236 000310 500447 100540 300639 600670 700
11、 M33 2761289 200380 500547 900662 100783 800821 900 M36 3865328 700432 500622 800804 400942 800934 200 M39 31 030391 400515 000741 600957 9001 123 0001 112 000 EN ISO 898-6:1995 8 BSI 12-1999 Table 7 Minimum stripping strength of nuts as a percentage of the proof load of bolts 8.2 Hardness test For
12、routine inspection, hardness tests shall be carried out on one bearing surface of the nut and the hardness shall be taken as the mean of three values spaced 120 apart. In case of dispute, the hardness tests shall be carried out on a longitudinal section through the nut axis and with impressions plac
13、ed as close as possible to the nominal major diameter of the nut thread. The Vickers hardness test is the referee test, and where practicable a load of HV 30 shall be applied. If Brinell or Rockwell hardness tests are applied, the conversion tables in accordance with ISO 4964 shall be used. The Vick
14、ers hardness test shall be carried out in accordance with the requirements of ISO 6507-1. The Brinell hardness test shall be carried out in accordance with the requirements of ISO 6506. The Rockwell hardness test shall be carried out in accordance with the requirements of ISO 6508. 8.3 Surface integ
15、rity test For the surface integrity test, see ISO 6157-2. 9 Marking 9.1 Symbols Marking symbols are shown in Table 8 and Table 9. 9.2 Identification Hexagon nuts of all property classes shall be marked in accordance with the designation system described in clause 3, by indenting on the side or beari
16、ng surface, or by embossing on the chamfer. See Figure 3 and Figure 4. Embossed marks shall not protrude beyond the bearing surface of the nut. Property class of the nut Minimum stripping strength of nuts as a percentage of the proof load of bolts with property classes 6.88.810.912.9 0485654540 0510
17、0856050 Figure 1 Axial tensile test Figure 2 Axial compressive test Figure 3 Examples of marking with designation symbol EN ISO 898-6:1995 BSI 12-19999 9.3 Marking of left-hand thread Nuts with left-hand thread shall be marked as shown in Figure 5 on one bearing surface of the nut by indenting. The
18、alternative marking for left-hand thread shown in Figure 6 may also be used. 9.4 Alternative marking Alternative or optional permitted marking as stated in 9.1 to 9.3, is left to the choice of the manufacturer. 9.5 Trade (identification) marking The trade (identification) marking of the manufacturer
19、 is mandatory on all products covered by the obligatory marking requirements for property classes, provided this is possible for technical reasons. Packages, however, shall be marked in all cases. Table 8 Marking for nuts with property classes in accordance with 3.1 Figure 4 Examples of marking with
20、 code symbol (clock-face system) Figure 5 Left-hand thread marking Figure 6 Alternative left-hand thread marking Property class5681012a Alternative marking either designation symbol 5681012 or code symbol (clock-face system) a Indication of the 12 oclock position with the manufacturers mark is not p
21、ossible. EN ISO 898-6:1995 10 BSI 12-1999 Table 9 Marking for nuts with property classes in accordance with 3.2 Property class0405 Marking EN ISO 898-6:1995 BSI 12-199911 Annex ZA (normative) Normative references to international publications with their relevant European publications This European S
22、tandard 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
23、 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. PublicationYearTitleEN/HDYear ISO 286-11988ISO systems of limits and fits Part 1: Bases of tolerances, deviations and fits EN 20286-1199
24、3 ISO 898-21992Mechanical properties of fasteners Part 2: Nuts with specified proof load values Coarse thread EN 20898-21993 12 blank BS EN ISO 898-6:1996 BSI 12-1999 List of references See national foreword. BS EN ISO 898-6:1996 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institu
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