BS-EN-20898-2-1994.pdf
《BS-EN-20898-2-1994.pdf》由会员分享,可在线阅读,更多相关《BS-EN-20898-2-1994.pdf(24页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 20898-2:1994 ISO 898-2: 1992 Mechanical properties of fasteners Part 2: Nuts with specified proof load values Coarse thread The European Standard EN 20898-2:1993 has the status of a British Standard UDC 621.882.3 BS EN 20898-2:1994 This British Standard, having been prepared u
2、nder the direction of the General Mechanical Engineering Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 June 1994 BSI 01-1999 First published April 1992 Second edition June 1994 The following BSI references relate to the work on this
3、standard: Committee reference GME/9 Draft for comment 90/79942 DC ISBN 0 580 23137 2 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Aus
4、triaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IcelandTechno
5、logical Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade SpainAsociac
6、in Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments BS EN 20898-2:1994 BSI 01-1999i Contents Page Cooperating organiz
7、ationsInside front cover National forewordii Foreword2 1Scope3 2Normative references3 3Designation system4 4Materials4 5Mechanical properties4 6Proof load values8 7Failure loads for nuts with nominal height $ 0.5 D but M16 M16 53.6; 4.6; 4.8# M16 # M39 5.6; 5.8# M39 66.8# M39# M39 88.8# M39# M39 M16
8、 # M39 99.8# M16# M16 1010.9# M39# M39 1212.9# M39# M16# M39 NOTEIn general, nuts of a higher property class can replace nuts of a lower property class. This is advisable for a bolt/nut assembly going into a stress higher than the yield stress or the stress under proof load. Property class of nut No
9、minal stress under proof load Actual stress under proof load N/mm2N/mm2 04400380 05500500 Property class Chemical composition limits (check analysis), % CMnPS max.min.max.max. 4a; 5a; 6a0,500,0600,150 8;904a0,580,250,0600,150 10b05b0,580,300,0480,058 12b0,580,450,0480,058 a Nuts of these property cl
10、asses may be manufactured from free-cutting steel unless otherwise agreed between the purchaser and the manufacturer. In such cases, the following maximum sulfur, phosphorus and lead contents are permissible: sulfur 0,34 %; phosphorus 0,11 %; lead 0,35 %. b Alloying elements may be added, if necessa
11、ry, to develop the mechanical properties of the nuts. EN 20898-2:1993 BSI 01-19995 Table 5 Mechanical properties Thread Property class 04054 Stress under proof load Sp Vickers hardness HV Nut Stress under proof load Sp Vickers hardness HV Nut Stress under proof load Sp Vickers hardness HV Nut greate
12、r than less than or equal toN/mm2min.max.statestyleN/mm2min.max.statestyleN/mm2min.max.statestyle M4 M4M7 M7M10380188302NQTathin500272353QTbthin M10M16 M16M39510117302NQTa1 Thread Property class 5c68 Stress under proof load Sp Vickers hardness HV Nut Stress under proof load Sp Vickers hardness HV Nu
13、t Stress under proof load Sp Vickers hardness HV Nut Stress under proof load Sp Vickers hardness HV Nut greater than less than or equal toN/mm2min.max.statestyleN/mm2min.max.statestyleN/mm2min.max.statestyleN/mm2min.max.statestyle M4520 130 600 150 800180 302NQTa 1 M4M7580670855 M7M10590302NQTa16803
14、02NQTa1870200 M10M16610700880 M16M39630146720170920233353QTb890180302 NQTa2 EN 20898-2:1993 6 BSI 01-1999 Table 5 Mechanical properties Thread Property class 91012 Stress under proof load Sp Vickers hardness HV Nut Stress under proof load Sp Vickers hardness HV Nut Stress under proof load Sp Vickers
15、 hardness HV Nut Stress under proof load Sp Vickers hardness HV Nut greater than less than or equal toN/mm2min.max.statestyleN/mm2min.max.statestyleN/mm2min.max.statestyleN/mm2min.max.statestyle M49001701 0401 140 295353QTb1 1 150 M4M7915 188 1 0401 1401 150 M7M10940302NQTa21 040272353QTb11 1401 160
16、272353QTb2 M10M169501 0501 1701 190 M16M399201 0601 200 NOTEMinimum hardness is mandatory only for heat-treated nuts and nuts too large to be proof-load tested. For all other nuts, minimum hardness is not mandatory but is provided for guidance only. For nuts which are not hardened and tempered, and
17、which satisfy the proof-load test, minimum hardness shall not be cause for rejection. a NQT = Not quenched or tempered. b QT = Quenched and tempered. c The maximum bolt hardness of property classes 5.6 and 5.8 will be changed to be 220 HV in the next revision of ISO 898-1:1988. This is the maximum b
18、olt hardness in the thread engagement area whereas only the thread end or the head may have a maximum hardness of 250 HV. Therefore the values of stress under proof load are based on a maximum bolt hardness of 220 HV. EN 20898-2:1993 BSI 01-19997 Table 6 Proof load values Coarse thread Thread Thread
19、 pitch Nominal stress area of the mandrel As Property class 0405456891012 Proof load (As p) N mmmm2Style 1Style 1Style 1Style 1Style 2Style 2Style 1Style 1Style 2 M30,55,031 9102 500 2 6003 0004 0004 5005 2005 7005 800 M3,50,66,782 5803 400 3 5504 0505 4006 1007 0507 7007 800 M40,78,783 3404 400 4 5
20、505 2507 0007 9009 15010 00010 100 M50,814,25 4007 100 8 2509 50012 14013 00014 80016 20016 300 M6120,17 64010 000 11 70013 50017 20018 40020 90022 90023 100 M7128,911 00014 500 16 80019 40024 70026 40030 10032 90033 200 M81,2536,613 90018 300 21 60024 90031 80034 40038 10041 70042 500 M101,55822 00
21、029 000 34 20039 40050 50054 50060 30066 10067 300 M121,7584,332 00042 200 51 40059 00074 20080 10088 50098 600100 300 M14211543 70057 500 70 20080 500101 200109 300120 800134 600136 900 M16215759 70078 500 95 800 109 900138 200149 200164 900183 700186 800 M182,519273 00096 00097 900 121 000 138 200
22、176 600170 900176 600203 500230 400 M202,524593 100122 500 125 000 154 400 176 400225 400218 100225 400259 700294 000 M222,5303115 100151 500 154 500 190 900 218 200278 800269 700278 800321 200363 600 M243353134 100176 500 180 000 222 400 254 200324 800314 200324 800374 200423 600 M273459174 400229
23、500 234 100 289 200 330 500422 300408 500422 300486 500550 800 M303,5561213 200280 500 286 100 353 400 403 900516 100499 300516 100594 700673 200 M333,5694263 700347 000 353 900 437 200 499 700638 500617 700638 500735 600832 800 M364817310 500408 500 416 700 514 700 588 200751 600727 100751 600866 0
24、00980 400 M394976370 900488 000 497 800 614 900 702 700897 900868 600897 9001 035 0001 171 000 EN 20898-2:1993 8 BSI 01-1999 6 Proof load values Proof load values are given in Table 6. The nominal stress area As is calculated as follows: where d23)is the basic pitch diameter of the external thread;
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS EN 20898 1994
链接地址:https://www.31doc.com/p-3741392.html