EN ISO 2320:1997
(Main)Prevailing torque type steel hexagon nuts - Mechanical and performance requirements (ISO 2320:1997)
Prevailing torque type steel hexagon nuts - Mechanical and performance requirements (ISO 2320:1997)
Sechskantmuttern aus Stahl mit Klemmteil - Mechanische und funktionelle Eigenschaften (ISO 2320:1997)
Diese Internationale Norm legt mechanische und funktionelle Eigenschaften für Sechskantmuttern mit Klemmteil (einschließlich solche mit Flansch) bei Prüfung bei einer Umgebungstemperatur zwischen 10°C und 35°C fest. Die Eigenschaften ändern sich bei höherer oder tieferer Temperatur.
Ecrous hexagonaux autofreinés en acier - Caractéristiques mécaniques et performances (ISO 2320:1997)
Šestrobe zaščitne matice z deformacijo - Mehanske in izvedbene zahteve (ISO 2320:1997)
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sechskantmuttern aus Stahl mit Klemmteil - Mechanische und funktionelle Eigenschaften (ISO 2320:1997)Ecrous hexagonaux autofreinés en acier - Caractéristiques mécaniques et performances (ISO 2320:1997)Prevailing torque type steel hexagon nuts - Mechanical and performance requirements (ISO 2320:1997)21.060.20MaticeNutsICS:Ta slovenski standard je istoveten z:EN ISO 2320:1997SIST EN ISO 2320:2001en01-julij-2001SIST EN ISO 2320:2001SLOVENSKI
STANDARD
SIST EN ISO 2320:2001
SIST EN ISO 2320:2001
SIST EN ISO 2320:2001
SIST EN ISO 2320:2001
SIST EN ISO 2320:2001
I NTE R NAT I ON AL STANDARD IS0 2320 Third edition 1997-1 1-01 Prevailing torque type steel hexagon nuts - Mechanical and performance properties Écrous hexagonaux autofreinés en acier - Caractéristiques mécaniques et performances Reference number IS0 2320:1997(E) SIST EN ISO 2320:2001
IS0 2320:1997(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non- governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnrcal Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 2320 was prepared by Technical Committee lSO/TC 2, Fasteners, Subcommittee SC 1, Mechanical properties of fasteners. This third edition cancels and replaces the second edition (IS0 2320:1983), which has been technically revised. Annexes A and B form an integral part of this International Standard. Annex C is for information only. O IS0 1997 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-121 1 Genbve 20 Switzerland Internet central @iso.ch X.400 c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii SIST EN ISO 2320:2001
INTERNATIONAL STANDARD 0 IS0 IS0 2320: 1997( E) Prevailing torque type steel hexagon nuts - Mechanical and performance properties 1 Scope This International Standard specifies the mechanical and performance properties for prevailing torque type steel hexagon nuts (including those with flange) when tested over an ambient temperature range of 10 "C to 35 OC. Properties will vary at higher and lower temperature. It applies to prevailing torque type nuts -with nominal thread diameters up to and including 39 mm; -of triangular IS0 thread according to IS0 68; - with diameter/pitch combinations according to IS0 261; -with thread tolerances 6H according to IS0 965-2; - with specific mechanical requirements; -with dimensions as specified in product standards provided they make reference to this International Standard; -within the temperature range -50 "C to +300 "C for all metal type nuts; -within the temperature range -50 "C to +I20 "C for non-metallic insert type nuts". It does not apply to nuts requiring special properties which may require special materials or coatings to improve - weldability; - corrosion resistance; - performance outside the above specified temperature ranges. Prevailing torque performance decreases with increasing re-use. The nut user should consider the implications of decreased performance prior to re-use. NOTE - Information on torque/clamping force performance requirements and testing are given in the annex C. These functional requirements and the acompanying test procedure are still under discussion and cannot be specified mandatorily for the time being. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 68-1 : -2', IS0 general purpose screw threads - Basic profile - Part I: Metric screw threads. IS0 261 : -3', IS0 general purpose metric threads - General plan. I) By careful choice of non-metallic materials higher service temperature properties can be attained by agree- ment between user and manufacturer. 2) To be published. (Revision of IS0 68:1973) 3) To be published. (Revision of IS0 261:1973) 1 SIST EN ISO 2320:2001
IS0 2320: 1997( E) 0 IS0 IS0 898-1:-4’, Mechanical properties of fasteners made of carbon steel and alloy steel - Part 7: Bolts, screws and studs. IS0 898-2:1992, Mechanical properties of fasteners - Part 2: Nuts with specified proof load values - Coarse thread. IS0 898-6:1994, Mechanical properties of fasteners - Part 6: Nuts with specified proof load values - Fine pitch thread. IS0 965-2:-5’, /SO general purpose metric screw threads - Tolerances - Part2: Limits of sizes for general purpose bolt and nut threads - Medium quality. IS0 4042:-6’, Fasteners - Electroplated castings. IS0 4753:-”, Fasteners - End of parts with external metric IS0 thread. IS0 6506:1981, Metallic materials - Hardness test - Brinell test. IS0 6507-1:-*’, Metallic materials - Vickers hardness test - Part 7: Test method. IS0 6508: 1986, Metallic materials - Hardness test - Rockwell test (scales A - B - C - D - E - F - G - H - KI. 3 Definitions For the purposes of this International Standard the following definitions apply. 3.1 prevailing torque type nut: Nut which is not free-running on a mating thread by virtue of a self-contained prevailing torque feature, and which provides a degree of resistance to rotation independent of clamping or compression forces. 3.2 prevailing torque developed by a nut:Torque necessary to rotate the nut on its mating, externally threaded component and with no axial load in the mating component. 4 Designation system The property classes specified for prevailing torque type nuts are the same as specified in ISO898-2 and IS0 898-6 for hexagon nuts, namely - nuts with nominal heights a 0,8 d (effective lengths of thread 2 0,6 d) are designated by a number to indicate the maximum appropriate property class of bolts with which they may be mated, see table 1; - nuts with nominal heights 2 0,5 d and e 0,8 d (effective height of thread a 0,4 d and c 0,6 d) are designated by a combination of two numbers: the second indicates the nominal stress under proof load on a hardened test mandrel, while the first indicates that the loadability of a bolt-nut assembly is reduced in comparison with the loadability on a hardened test mandrel and also in comparison with a bolt-nut assembly described in table 1. Table 2 gives the designation system and the stresses under proof load of these nuts. 4) To be published. (Revision of IS0 898-1:1988) 5) To be published. (Revision of IS0 965-2:1980) 6) To be published. (Revision of IS0 4042:1989) 7) To be published. (Revision of IS0 4753:1983) 8) To be published. (Revision of IS0 6507-1:1982; IS0 6507-2:1983; IS0 6507-3:1989; IS0 409-1:1982; IS0 409-2:1983 and ISO/DIS 409-3) 2 SIST EN ISO 2320:2001
Table 1 - Designation system for nuts with nominal heights 3 0,8 d Property Coarse thread class ofthe nut Fine pitch thread IS0 2320: 1997(E) 5 6 8 9 10 12 6 8 - 10 12 - Property class of the mating bolt or screw 5.8 9.8 10.9 12.9 s 6.8 s 8.8 s 8.8 9.8 10.9 8.8 8.8 NOTE - In general, nuts of a higher property class can replace nuts of lower property class. However it is not recommended that a heat-treated all-metal nut be combined with a bolt of lower property class. Property class of nut Table 2 - Designation system and stresses under proof load for nuts with nominal heigths 2 0,5 d and < O,$ d Nominal stress Actual stress under under proof load proof load 04 N/mm2 N/mm2 400 380 05 5 Materials and processes 500 500 5.1 Materials Coarse Fine pitch 511; 611 thread thread 6 8; 9; 04” 8 1 OZ’; 1 OZ’ Nuts shall be made of steel conforming to the chemical composition limits specified in table 3. The prevailing torque element of insert-type nuts may be made of a material other than steel. It is recommended that users and manufacturers consider the maximum limits for sulphur, manganese, boron and other intentionally added elements which may result in component failure, when in excessive amounts. C Mn P S max. min. max. min. 0,50 - 0,060 0,150 0,58 0,25 0,060 0,150 0,58 0,30 0,048 0,058 Table 3 - Limits of chemical composition 1 221 Property class 1 221 0,58 0,45 0,048 0,058 Chemical composition limit (check analysis), % 3 SIST EN ISO 2320:2001
IS0 2320: 1 997( E) 5.2 Heat treatment 5.2.1 Nuts with coarse thread Nuts of property classes 05, 8 (style 1, > M16), 10 and 12 shall be quenched and tempered. Case hardening is not allowed for any property class. 5.2.2 Nuts with fine pitch thread Nuts of property classes 05, 8 (style I), 10 and 12 shall be quenched and tempered. Case hardening is not allowed for any property class. 5.3 Thread The thread of the prevailing torque type nuts must conform to ISO965-2 except for the prevailing torque element. In the case of prevailing torque type nuts with non-metallic insert, the go ga'uge must be capable of being screwed in freely by hand as far as the insert. In the case of all-rnetal nuts the go gauge must be capable of being screwed in freely by hand for at least one thread. 5.4 Finish All-metal nuts shall be lubricated and nuts with non-metallic insert may be lubricated to meet the stated perfor- mance requirements. The lubricant shall not constitute a health hazard to the user, nor emit an unpleasant odour during assembly and shall be suitable for automatic or robotic assembly. Lubricant, when used, must be suitable for assembly speeds from 10 to 500 r/min. The performance of nuts which are supplied with a protective coating and/or lubricant shall not deteriorate when the nuts are stored indoors for a period of six months. The storage temperature shall be within the range -5 "C to +40 OC. NOTE - In the case where nuts are given a protective coating or cleaning following delivery to the user, the nut manufacturer shall not be held responsible for failure of the nut to meet dimensional, mechanical or performance properties traceable to the plating or coating. 5.5 Hydrogen embrittlement For hydrogen embrittlement see IS0 4042. 6 Mechanical properties When tested by methods described in 8.1 and 8.2, the nuts shall have the mechanical properties set out in tables 4 and 5. Nuts shall withstand the proof load values specified in tables 6 and 7 for the applicable property class when tested as specified in 8.1. 4 SIST EN ISO 2320:2001
IS0 2320: 1997( E) D U 2 f 8 O O E z Q, 8 6 2! - O O c O .- I ?j t Q, U I- c .- BI E c 3 z I c - il 5 SIST EN ISO 2320:2001
IS0 2320:1997(E) IIIII c z z I I 6 SIST EN ISO 2320:2001
IS0 2320: 1997( E) I a 5 N - c 3 z a + + - N O W - m W m W I m m N O CO m O O N 7 I U U 9 f n c O c Q, C c d E a, a 2 n - U O c O .- 6 s I 3 m a, U I- N - c 3 z x E $g I- 52 c E .- W m W W m W I O m N N O 0 W m W 7 SIST EN ISO 2320:2001
IS0 2320: 1997( E) Thread Table 6 - Proof load values - Coarse thread (see also IS0 898-2) Property class Nominal Pitch stress of the areaof M3 M4 M5 M6 M7 04 I 05 I 51 61 8 191 10 I 12 Proof load (A, x S,) A, N mm mm2 thin thin style 1 style 1 style 1 style 2 style 2 style 1 style 1 style 2 0,5 5,03 1910 2 500 2 600 3 O00 4000 - 4500 5200 5700 5 800 0,7 8.78 3340 4400 4550 5250 7 O00 - 7900 9150 10000 10100 0,8 14,2 5400 7 100 8250 9500 12 140 - 13000 14800 16200 16300 1 20,l 7640 10000 11 700 13500 17200 - 18400 20900 22900 23100 1 28,9 11000 14500 16800 19400 24700 - 26400 30 100 32900 33200 M12 M14 M16 M18 M20 M24 M27 M30 M33 M36 M22 M39 1,75 84,3 32000 42200 51 400 59000 74200 - 80 100 88500 98600 100300 2 115 43700 57500 70200 80500 101 200 - 109300 120800 134600 136900 2 157 59700 78500 95800 109900 138200 - 149200 164900 183700 186800 2.5 192 73000 96000 121 O00 138200 176600 170900 176000 203500 - 230 400 2.5 245 93100 122500 154400 176400 225400 218100 225400 259700 - 294 O00 363 600 3 353 134100 176500 222400 254200 324800 314200 324800 374200 - 423 600 3 459 174400 229500 289200 330500 422300 408500 422300 486500 - 550 800 3,5 561 213200 280500 353400 403900 516100 499300 516 100 594700 - 673 200 3.5 694 263700 347000 437200 499700 638500 617700 638500 735600 - 832 800 4 817 310500 408500 514700 588200 751600 727100 751600 866000 - 980 400 2,5 303 115100 151500 190900 218200 278800 269700 278800 321200 - 4 976 370900 488000 614900 702700 897900 868600 897900 1035000 - 1171000 Table 7 - Proof load values - Fine pitch thread (see also IS0 898-6) 04 I 05 Property class Nominal 6 8 10 12 mandrel I As thin 14 900 24500 23300 35000 MlOxl I U:; M10x1,25 thin style 1 style 1 style 2 style 1 style 2 style 2 19 600 30 200 37 400 34900 43 100 41 300 47 O00 61 600 57 400 71 O00 68000 77 400 32200 49 600 58400 54500 67 300 64600 73400 30600 47 100 46000 71 800 88000 82000 102200 97200 110 500 M12x1,25 I 92,l 81 700 77500 103 400 M12x1,5 I 88,l M14x1,5 I 125 - - 107500 187000 221 500 232 200 - 102000 177500 210100 220 300 - 136 O00 236 600 280 200 - 293 800 - - - - M16x1,5 M18x1,5 M18x2 M20x1,5 272 t M20x2 258 98000 126 500 120 800 145 900 188 500 236 O00 M22x1,5 I ;i; M22x2 129000 224500 265700 - - - 278 600 166 500 289 700 343 O00 359 700 - 159 O00 276 700 327 500 343 400 - 192 O00 334 100 395 500 41 4 700 - 248 O00 431 500 510 900 535 700 - 310 500 540 300 639 600 670 600 - - - - - - - - - - - M30x2 I 621 289200 I 380500 I 662 100 I 783800 I - M39x3 I 1030 f is the pitch of thread - I 821 900 I - - 33 500 I 44000 I 68700 I 84 100 I 78400 I 97800 I 92900 I 105700 47 500 I 62 500 I 97 500 1 119400 I 111200 I 138700 I 131900 I 150000 - 63500 I 83500 I 130300 I 159500 I 148600 I 185400 I 176200 I 200400 - 391 400 I 515000 I 957 900 I 1 123000 I - I 1112000 - a SIST EN ISO 2320:2001
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IS0 2320: 1 997( E) g. t * c-Y B f c O c P !! f '5 F f '5 d s z s rc a, O c 3 C O, 8 c O d 3 c O, a, c b O e e 9 .- F B z 2 2 O - Y E P O .- F E O u I 3 OI a, O I- 2 c-- N h c-. c-. d mm* O00 *toc0 rc-c- m to- 2 Neto c-vc- f f O O - E 9 a. to 03.r Vc-N WO* towm r! wmm mmo c-Nm c-. '4 P%gj "? t 'we *mm omm wew Nmm 'O mc-to om03 NNN h mm 0 d d "0 P,P 10 SIST EN ISO 2320:2001
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