JIS-B-1043-1993-R2003-ENG.pdf

STDmJIS B 1043-ENGL 1773 W 4733608 0563506 877 JIS JAPANESE I NDUSTRIAL STANDARD Translated and Published by Japanese Standards Association (IS0 6157-3 1988) (Reaffirmed in 1998) Fast eners- Surface d iscon ti nui ties- Part 3: Bolts, screws and studs for special requirements ICs 21.060.10 Descriptors : threads, bolts, studs (fasteners), surface defects Reference number : JIS B 1043 : 1993 (E) 10 s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- 3993 4933b08 05b3507 703 = B 1043 : 1993 (IS0 6157-3 : 1988) Foreword T h i s translation has been made based on the original Japanese Industrial Standard established by the Minister of International Trade and Industry through deliberations at Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law: Date of Establishment: 1993-07-01 Date of Reaffirmation: 1998-03-20 Date of Public Notice in Official Gazette: 1998-03-20 Investigated by: Japanese Industrial Standards Committee Divisional Council on Machine Elements JIS B 1043 : 1993, First English edition published in 2000-06 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Mina to-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. v O JSA2000 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. Printed in Japan Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS B 1043 : 1993 (IS0 6157-3 : 1988) Fasteners-Surface discontinuities- Part 3 : Bolts, screws and studs for special requirements Foreword for Japanese Industrial Standard This Japanese Industrial Standard has been prepared based on IS0 6157-3 (Fas- teners-Surface discontinuities-Part 3 : Bolts, screws and studs for special require- ments) issued in 1988 as the first edition without changing the technical contents. The “Informative references” underlined with dots in this Standard show the matters not specified in the original International Standard. 1 Scope 1.1 bolts, screws and studs for special requirements. This Standard establishes limits for various types of surface discontinuities on It applies to bolts, screws and studs with - nominal thread diameters 5 mm and larger; - product grades A and B; - nominal lengths 1 I10d (or longer if specified) - property class 12.9; - property classes 8.8, 9.8 and 10.9 when specified in product standards or agreed between supplier and purchaser. be c L 2 1.2 Where the permissible limits for surface discontinuities indicated in clause 3 occur, the minimum values for the mechanical and functional properties specified in IS0 898-1 should still be met. When fatigue strength requirements are specified, the fatigue strength should not lower than that obtained on bolts without defects taken from the same lot. Informative reference : IS0 898-1 is equivalent to JIS B 1051 Mechanical operties of steel bolts and screws p.r . _._._. -. Notes 1 The figures in clause 3 are examples only. They apply correspond- ingly also to other types of bolts, screws and studs. The individual figures show the surface discontinuities exaggerated in some cases for clarity. . 2 References IS0 468 Surface roughness-Parameters, their values and general rules for speci- fying requirements Mechanical properties of fasteners-Part 1 : Bolts, screws and studs IS0 898-1 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 1043-ENGL 1993 4933608 05b3509 5ôb 2 B 1043 : 1993 (IS0 6157-3 : 1988) IS0 3269 Fasteners-Acceptance inspection Remarks : JIS B 1091 Fasteners-Acceptance inspection is identical with the said International Standard. 3 Types, causes, appearance and limits of surface discontinuities 3.1 Cracks A crack is a clean (crystalline) fracture passing through or across the grain boundaries and may possibly follow inclusions of foreign elements. Cracks are normally caused by overstressing the metal during forging or other forming operations, or during heat treatment. Where parts are subjected to significant re- heating, cracks usually are discoloured by scale. 3.1.1 Quench cracks Cause Appear- ance Limits Quench cracks may occur during hardening due to excessively high ther- mal and transformation stresses. Quench cracks usually follow an ir- regular and erratic course on the surface of the fastener. Quench crack circum- ferential and adjacent to fillet Quench crack at root Quench crack at comer of head , Quench crack, section at crest Transverse i . k ! Longitudinal quench crack Quench crack across top of head. Usually an extension of crack in shank or side of head I of IA I Quench crack across washer face and to tc Quench crack extending radiallv into fillet depth of washer face thickness A-A Quench crack, / I at root Quench crack Quench cracks of any depth, any length, or in any location are not per- mitted. I Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- STD*JIS B L043-ENGL $973 M 4933b08 05b35LO 2TB 3 B 1043 : 1993 (IS0 6157-3 : 1988) 3 . 1 . 2 Forging cracks Cause Appear- ance Limits Forging cracks may occur during the cut-off of forging operations and are located on the top of the head of screws and bolts. - Forging crack on top of head I Length, 2, of forging cracks: Depth or width, b, of forging cracks: Note : The limits for forging cracks do not apply to socket head screws (see 3 . 1 . 5 ) . I S d b S 0.04d d = nominal thread diameter L I . Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 1043-ENGL 1993 = 4933b08 0563511 134 m 4 B 1043 : 1993 (IS0 6157-3 1988) 3.1.3 Forging bursts Cause Appear- ance Limits Forging bursts may occur for example during forging on the flats 01 corners of the heads of bolts and screws, at the periphery of flanged 0 1 circular head products or on the raised periphery of indented head bolts and screws. rForging burst I ,Forging bursts Forging bursts L Forging bursts Hexagon head screws No forging burst in the flats of hexagon bolts and screws shall extend into the crown circle on the top of the head surface (chamfer circle) or into the underhead bearing surface. Forging bursts occurring at the intersection of two wrenching flats shall not reduce the width across corners below the specified minimum. Forging bursts in the raised periphery of indented head bolts and screws shall not exceed a width of 0.06d or have a depth extending below the indented portion. Circular head screws Flanges of bolts and screws and peripheries of circular head screws may have forging bursts, but they shall not exceed the following lim- its: Width of forging bursts: 0.08dc 0.04dc (with only one forging burst); (with two or more forging bursts, one of which may ex- tend to 0.08dc). Depth of forging bursts: 0.04d d = nominal thread diameter 2, d, = head or flange diameter A . Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- STD*JIS B L043-ENGL LSq3 4933608 0563532 070 b I 5 B 1043 : 1993 (IS0 6157-3 : 1988) 3.1.4 Shear bursts Cause Shear bursts may occur, for example during forging, frequently at the periphery of products having circular or flanged heads, and are located at approximately 45“ to the product axis. I Shear bursts may also occur on the sides of hexagon head products. I I Limits Hexagon head screws Shear burst limits on the wrenching head are as follows: Width Depth 5 0.04d 2, S 0.25 mm + 0.02s No shear burst in the flats of hexagon bolts and screws shall extend into the crown circle on the top of the head surface (chamfer circle) or into the underhead bearing surface. Shear bursts, occurring at the in- tersection of two wrenching flats, shall not reduce the width across corners below the specified minimum. Shear bursts in the raised periphery of indented head bolts and screws shall not exceed a width of 0.06d2) or have a depth extending below the indented portion. Circular head screws Flanges of bolts and screws and peripheries of circular head products may have shear bursts, but shall not exceed the following limits: Width of shear bursts: 0.08 0.04dc (with two or more forging shear bursts, one of which may extend to 0.08dc). s =width across flats 2, d = nominal thread diameter 3, dc = head or flange diameter Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- STDIJIS 6 1043-ENGL 1993 M 4933608 05b3513 TO7 6 B 1043 : 1993 (IS0 6157-3 : 1988) 3.1.5 Forging cracks in socket head screws Cause Appear- ance Cracks in the periphery, in the top surface and on the indented por tion (hexagon socket) may occur on the inner and outer faces due t c cut-off of wire section, shear and compressive stress during forging operations and countersinking of head. Permissible-does not extend more than half the distance between the periphery of the head and the socket Permissible 7 Permissible 'Not permissible potential intersecting discontinuities Not permissible- connects socket and edge of head '. 1 Permissible Not permissible- potential intersecting discontinuities L Not permissible /Permissible Permissible 9 Not permissible- connects socket and edge of head 1 1 a Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- . STD-JIS B 1043-ENGL 1793 m 4733b08 05b3514 943 m 7 B 1043 : 1993 (IS0 6157-3 : 1988) kppear- ince con- ;inued) , - Permissible Not permissibl+ potential intersecting discontinuities Permissit - not in area of key engagement (bottom of socket) J ' h Permissible depths: hl 5 O.O3dk l): 0.13 mm max. h2 5 0.06dk: 1.6 mm max. D Not permissible- transverse discontinuities in the fillet area Permissible bottom of socket dk = head diameter 2) t = key engagement socket depth Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- STDmJIS B L043-ENGL 1993 m 4933608 0563535 88T 9 8 B 1043 : 1993 (IS0 6157-3 : 1988) JLimits Cracks extending from the socket to the outer face and cracks with a traverse indicating a potential to intersect are not permissible. Cracks within 0 . 3 t of the bottom of the socket are not permissible. Cracks located elsewhere in the socket are permissible, provided that they do not exceed a length of 0.25t and a depth of o . o k ? k (0.13 mm max.). One crack in the longitudinal direction with a depth not exceeding 0.03dk (0.13 mm max.) at the headshank intersection and on the top of the head is permissible. Longitudinal cracks with a depth not exceeding 0.06clk (1.6 mm max.) located in the periphery are permissible. 3.2 Raw material seams and laps A seam or lap is a narrow, generally straight or smooth curved line discontinuity running longitudinally on the thread, shank or head. Cause Appear- ance Limits Seams and laps are inherent in the raw material from which fasteners are made. Lap or seam, usuaily straight or smooth curved line discontinuity running longitudinally I I Lap or seam, usually straight or smooth curved line discontinuity running longitudinally Permissible depth: 0.015d i) + 0.1 mm: 0.4 mm max. If laps or seams extend into the head, they shall not exceed the per- missible limits for width and depth specified for bursts (see 3 . 1 . 3 ) . i) d = nominal thread diameter Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- 9 B 1043 : 1993 (IS0 6157-3 : 1988) 3 . 3 Voids due to non-filling of metal during forging or upsetting. A void is a shallow pocket or hollow on the surface of a bolt or screw Cause Appear- ance Limits Voids are produced by marks and impressions due to chips (shear burrs) or by rust formation on the raw material. They are not eliminated during forging or upsetting operations. Voids U Depth, h, of voids: h d 0.02d l): 0.25 mm max. Area of all voids: The combined surface area of all voids on the bearing face shall noí exceed 5 % of the total area. i) d = nominal thread diameter Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:17:24 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 1043-ENGL 2993 4733608 0563537 652 10 B 1043 : 1993 (IS0 6157-3 1988) 3.4 fastener during forging. Folds A fold is a doubling over of metal which occurs at the surface af the Cause Appear- ance Limits Folds are produced by material displacements due to lack of congru- ence of forms and volumes of the single forging steps. Permissible, at the intersedion between flange and driving part Permissible, typical “clover leaf fold in non-circular shoulder fastener Permissible, at the surface Permissible, fold Of