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1、J IS JAPANESE I N D U STR I AL STANDARD Translated and Published by Ja pa nese Stan dards Association Tolerances for fasteners- Part 1 : Bolts, screws, studs and nuts-Product grades A, B and C ICs 21.060.10; 21.060.20 Reference number : JIS B 1021 : 2003 (E) PROTECTED BY COPYRIGHT 33 s B 1021 : 2003
2、 (IS0 4759-1 : 2000) Foreword This translation has been made based on the original Japanese Industrial Standard revised by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee, as the result of proposal for revision of Japanese Industrial S
3、tandard submitted by The Japan Research Institute for Screw Threads and Fasteners (JFRI)/ the Japanese Standards Association (JSA) with the draft being attached, based on the provision of Article 12 Clause 1 of the Industrial Standard- ization Law applicable to the case of revision by the provision
4、of Article 14. Consequently JIS E 1021 : 1985 is replaced with this Standard. This revision has been made based on IS0 4759-1 : 2000 Tolerances for fasteners-Part 1 : Bolts, screws, studs and nuts-Product grades A, B and C for the purposes of making easy to compare this Standard with Inter- national
5、 Standard; to prepare Japanese Industrial Standard conforming with International Standard; and to propose a draft of International Standard which is based on Japanese Industrial Standard. Attention is drawn to the possibility that some parts of this Standard may conflict with a patent right, applica
6、tion for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have technical properties. The relevant Minister and the Japanese Industrial Standards Committee are not responsible for identifying the patent right,
7、 application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have the said technical properties, Date of Establishment: 1985-03-01 Date of Revision: 2003-03-20 Date of Public Notice in Official Gazette:
8、2003-03-20 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Machine Elements JIS B 1021 : 2003, First English edition published in 2003-09 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In t
9、he event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA 2003 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 mi
10、crofilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT -,-,- B 1021 : 2003 (IS0 4759-1 : 2000) Contents Page Introduction . 1 1 2 3 3.1 3.2 4 4.1 4.2 5 5.1 5.2 Scope 1 Normative references 1 Tolerances for metric bolts. screws and studs . 4 Dimensional tol
11、erances . 4 Geometrical tolerances . 13 Tolerances for metric nuts . 26 Dimensional tolerances . 26 Geometrical tolerances . 32 Tolerances for tapping screws . 37 37 41 Dimensional tolerances-Product grade A Geometrical tolerances-Product grade A . Annex A (informative) Tolerances 45 Annex B (inform
12、ative) Examples of dimensioned and toleranced fasteners 47 Annex C (informative) Examples of gauges and other measuring devices . 50 (i PROTECTED BY COPYRIGHT -,-,- JAPANESE INDUSTRIAL, STANDARD JIS B 1021 : 2003 (IS0 4759-1 : 2000) Tolerances for fasteners- Part 1 : Bolts, screws, studs and nuts- P
13、roduct grades A, 3 and C Introduction This Japanese Industrial Standard has been prepared based on the second edition of IS0 4759-1 : 2000 Tolerances for fasteners-Part 1 : Bolts, screws, studs and nuts-Product grades A, I3 and C published in 2000 without modifying the technical contents. 1 This Sta
14、ndard specifies a selection of tolerances for bolts, screws, studs and nuts with IS0 metric threads and with product grades A, B and C and for tap- ping screws with product grade A. The product grades refer to the size of the tolerances where grade A is the most precise and grade C is the least prec
15、ise. The International Standard corresponding to this Standard is as fol- lows. In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISOAEC Guide 2
16、1. IS0 4759-1 : 2000 Tolerances for fasteners-Part 1 :Bolts, screws, studs and nuts-Product grades A, B and C (IDT) The tolerances, except tolerances for threads, are selected from the system of limits and fits specified in JIS B 0401-1 and JIS B 0401-2. The tolerances for metric threads are taken f
17、rom the series of tolerance classes specified in JIS B 0209-3. The tolerances for tapping screw threads are covered in JIS B 1007. The tolerances of form and position are specified and indicated in accordance with JIS B 0021, JIS B 0023 and JIS B 0024. The tolerances specified in this Standard apply
18、 to fasteners prior to coating un- less otherwise specified. See also JIS B 1044. Deviations from the tolerances specified in this Standard are only permitted in product standards where there are valid technical reasons. In cases where there is a difference between the tolerance requirements in this
19、 Standard and the product standard, the product standard takes precedence. It is recommended that these tolerances also be used for non-standard fasteners. Dimensions and tolerances given in this Standard are in millimetres. Scope NOTE 1 NOTE 2 2 Normative references The following standards contain
20、provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standards (including amendments) indicated below shall be applied. Geometrical product specification (GPS)-Geometrical tolerancing- Tolerancing of form, orientation, location
21、 and run-out JIS B 002 1 PROTECTED BY COPYRIGHT -,-,- 2 B 1021 : 2003 (IS0 4759-1 : 2000) NOTE : ISO/DIS 1101 : 1996 Geometrical product specifications (GPS)-Geo- metrical tolerancing-Tolerancing of form, orientation, location and run-out is identical with the said standard. JIS B 0023 Technical dra
22、wings-Geometrical tolerancing-Maximum material requirement and least material requirement NOTE : IS0 2692 : 1988 Technical drawings-Geometrical tolerancing-Maxi- mum material principle is identical with the said standard. Technical drawings-Fundamental tolerancing principle JIS B 0024 NOTE : IS0 801
23、5 : 1985 Technical drawings-Fundamental tolerancing prin- ciple is identical with the said standard. JIS B 0143 Symbols and designations of dimensions for threaded fasteners NOTE ; IS0 225 : 1983 Fasteners-Bolts, screws, studs and nuts-Symbols and designation of dimensions is equivalent to the said
24、standard. JIS B 0209-3 IS0 general purpose metric screw threads-Tolerances-Part 3 : Deviations for constructional screw threads NOTE : IS0 965-3 : 1988 IS0 general purpose metric screw threads-Toler- ances-Part 3 : Deviations for constructional screw threads is identi- cal with the said standard. JI
25、S B 0401-1 IS0 system of limits and fits-Part 1 : Bases of tolerances, devia- tions and fits IS0 286-1 : 1988 IS0 system of limits and fits-Part 1 : Bases of tol- erances, deviations and fits is identical with the said standard. JIS B 0401-2 IS0 system of limits and fits-Part 2 : Tables of standard
26、tolerance grades and limit deviations for holes and shafts IS0 286-2 : 1988 IS0 system of limits and fits-Part 2 : Tables of stan- dard tolerance grudes and limit deviations for holes and shafts is iden- tical with the said standard. NOTE NOTE : JIS B 1005 Radii under the head for external threaded
27、fasteners NOTE : IS0 885 : 2000 General purpose bolts and screws-Metric series-Radii under the head is identical with the said standard. JIS B 1007 Threads and thread ends for tapping screws NOTE : IS0 1478 : 1999 Tapping screws thread is equivalent to the said stan- dard. JIS B 1012 NOTE : IS0 4757
28、 : 1983 Cross recesses for screws is equivalent to the said stan- dard. Cross recesses for screws JIS B 1013 NOTE : Countersunk head screws-Head configuration and gauging IS0 7721 : 1983 Countersunk head screws-Head configuration and gauging is identical with the said standard. JIS B 1015 Hexalobula
29、r internal driving feature for bolts and screws PROTECTED BY COPYRIGHT -,-,- 3 B 1021 : 2003 (IS0 4759-1 : 2000) NOTE : IS0 10664 : 1999 Hexalobular internal driving feature for bolts and screws is identical with the said standard. JIS B 1044 Fasteners-Electroplated coatings NOTE : IS0 4042 : 1999 F
30、asteners-Electroplated coatings is identical with the said standard. JIS B 1123 Hexagon head tapping screws NOTE : IS0 1479 : 1983 Hexagon head tapping screws is equivalent to the said standard. JIS B 1126 Hexagon washer hear tapping screws NOTE : IS0 7053 : 1992 Hexagon washer head tapping screws i
31、s identical with the said standard. JIS B 1127 Hexagon flange head tapping screws NOTE : IS0 10509 : 1992 Hexagon flange head tapping screws is identical with the said standard. JIS B 1181 Hexagon nuts and hexagon thin nuts NOTE : IS0 4032 : 1999 Hexagon nuts, style 1-Product grades A and B is equiv
32、alent to the said standard. JIS B 1194 Hexagon socket countersunk head screws NOTE : IS0 10642 : 1997 Hexagon socket countersunk head screws is identi- cal with the said standard. PROTECTED BY COPYRIGHT -,-,- 4 B 1021 : 2003 (IS0 4759-1 : 2000) Tolerance for product grades B C 3 Tolerances for metri
33、c bolts, screws and studs 3.1 Dimensional tolerances Symbols and designations of dimensions are speci- fied in JIS B 0143. Notes Feature 8g (but 6g for property class 8.8 a d higher) 3.1.1 Tolerance level Shank and bearing surface Other features For certain prod- ucts and coatings, other tolerance c
34、lasses for threads may be specified in the relevant product and coat- ing standards. 3.1.2 External thread 3.1.3 Driving features 3.1.3.1 External 3.1.3.1.1 Width across flats Figure 1 F j Figure 2 A close close Tolerance 30 h14 close wide wide wide S 5 18 18 5 60 60 i180 180 Tolerance h14 h15 h16 h
35、17 PROTECTED BY COPYRIGHT -,-,- 5 2000) B 1021 : 2003 (IS0 4759-1 Feature 3.1.3.1.2 Width across cor- ners Tolerance for product grades A B C emin = 1.13min emin = l.12smin for bolts and screws with flange and other cold forged heads without trimming operation Figure 3 I Figure 4 I 3.1.3.1.3 Height
36、of head js14 Figure 5 js15 12 14 D12 n I Tolerance +0.06 +0.06 +0.07 B tdes C Notes Tolerance field C13 for n s 1 C14 for n l PROTECTED BY COPYRIGHT 8 B 1021 : 2003 (IS0 4759-1 : 2000) Feature 3.1.3.2.3 Depth of hexagon sockets and slots 3.1.3.2.4 Cross recesses 3.1.3.2.5 Hexalobular recesses 3.1.4
37、Other features 3.1.4.1 Head diameter I Figure 12 I Figure 13 Tolerance for product mades The depth of hexagon sockets and slots is specified in product stan- dards only as a minimum. It is restricted by the minimum wall thickness w. See JIS B 1012 for all dimensions except penetration depths. For pe
38、netration depths see appropriate product standard. See JIS B 1015 for all dimensions except penetration depths. For penetration depths see appropriate product standard. h13 (3) h14 Notes For the time being generally appli- cable tolerances cannot be speci- fied. Note (3) +IT13 for knurled heads Comb
39、ined control of diameter and height for counter- sunk head screws in accordance with JIS B 1013 or JIS B 1194. PROTECTED BY COPYRIGHT 9 B 1021 : 2003 (IS0 4759-1 : 2000) Feature 3.1.4.2 Head height (except for hexagon heads) m n w - Figure 14 !p- Figure 15 3.1.4.3 Bearing face diam- eter and height
40、of washer- faced portion X Note (4) Reference datum for d w Figure 16 Tolerance for product g A 5 M 5 : h13 M5 : h14 Ides For countersunk head screws k is defined in product standards only as a maximum. dw min = smin - IT16 for width across flats 2.5 c: 4 4 16 6 I 14 14 s36 36 o. 10 0.15 0.15 0.15 0
41、.20 0.30 0.25 0.40 0.50 0.60 0.80 1.0 Notes Combined control of diameter and height for counter- sunk head screws in accordance with JIS B 1013 or JIS B 1194. For product grade C a washer face is not mandatory. PROTECTED BY COPYRIGHT -,-,- 10 B 1021 : 2003 (IS0 4759-1 : 2000) Feature Note (6) Refere
42、nce datum for d w Figure 17 h .3 b 3 x Note (6) Reference datum for d w Figure 18 Figure 19 Tolerance for product grades A I B I C dw is defined in product standards only as a minimum. Thread diameter 2.5 5 10 16 24 36 I 2.5 5 10 16 24 36 - Notes min. For product grade A only d k m i n - 0.14 dkmin
43、- 0.25 d k m i n - 0.4 dkmin - 0.5 d k m i n - 0.8 .sy?rAl 0.76 0.84 0.92 1.00 . _. 0.57 1.14 1.26 1.38 33 36 1.52 1.64 0.88 Notes (lo), (11) See Figure 26. Note (20) Up to 0.8 Fig. 74 0.75“rl 0.75“ -71“ I X I I Notes (6) (7) (8) 3 x simultaneously. Figure B.3 Hexagon nut with flange Line of highest
44、 points on any radial line. Radial lines between da max and d, min. PROTECTED BY COPYRIGHT 50 B 1021 : 2003 (IS0 4759-1 : 2000) Annex C (informative) Examples of gauges and other measuring devices C.l Application This annex gives examples of gauges and other measuring de- vices which can verify whet
45、her the tolerances specified in this Standard are satis- fied. The thread of gauges and measuring devices shall be within the limits for GO gauges. Guides shall have such an accuracy that errors due to the guides during inspection are negligible compared to the workpiece tolerance t (e.g. less than
46、10 % oft). If the datum is not associated with the maximum material requirements, indi- cated by 0, the following applies: - when the datum is an external thread, the major diameter axis (MD) or the pitch diameter axis (PD) is the datum as specified in this Standard. When the datum is the major diam
47、eter, the part may be fixed in a 3 jaw chuck; - when the datum is an internal thread, in the examples of this annex the nut is tightened against a conical spring washer. Another possibility is to use a ta- pered threaded mandrel for this purpose; - when the datum is a plain shaft or a tapping screw
48、thread it may be fixed in a 3 jaw chuck regardless of the feature size. C.2 Gauges and other measuring devices NOTE : All gauges given in this annex are GO gauges. Diameter d, if exis- tent, should be chosen by the gauge manufacturer. The gauges and measuring devices given in this annex are intended for the veri- fication of geometrical tolerances specified in 3.2, 4.2 and 5.2. Each gauge and measuring device is allocated to one or more figures in the main, body of this Standard in order to make clear which tolerance is verified by which gauge or measuring device. Note (1) M