इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 1367-2 (2002): Technical Supply Conditions for Threaded Steel Fasteners, Part 2: Tolerances for Fasteners - Bolts, Screws, Studs and Nuts - Product Grades A, B and C [PGD 31: Bolts, Nuts and Fasteners Accessories] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 1367 (Part 2) :2002 .- 1s0 4759-1:2000 m2 ( ?%!7y?m7 f)?m) Indian Standard TECHNICAL SUPPLY CONDITIONS FOR THREADED STEEL FASTENERS PART 2 TOLERANCES FOR FASTENERS — BOLTS, SCREWS, STUDS AND NUTS — PRODUCT GRADES A, B AND C (Third Revision ) ICS 21.060.10 @BIS 2002 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 December 2002 Price Group 14 J ‘\. Bolts, Nuts and Fasteners Accessories Sectional Committee, BP 33 — NATIONAL FOREWORD This Indian Standard (Part 2) (Third Revision) which is identical with ISO 4759-1:2000 ‘Tolerances for fasteners—Part 1:Bolts, screws, studs and nuts — Product grades A, B and C’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recomrhendation of the Bolts, Nuts and Fasteners Accessories Sectional Committee and approval of the Basic and Production Engineering Division Council. This standard was originally published in 1961 and subsequently revised in 1967 and 1979. The last revision was based on ISO 4759/1-1978. This revision of the standard has been taken up to align it with ISO 4759-1:2000 by adoption under dual numbering system. The text of ISO Standard has been approved as suitable for publication as Indian Standard without deviations. Certain terminology and conventions are, however, not identical to those used in Indian Standards. Attention is drawn especially to the following: a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’. b) Comma (,) has been used as adecimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker. Inthis adopted standard, reference appears to certain International Standards for which Indian Standards also exist. The corresponding Indian Standards which are to be substituted in their place are listed below along with their degree of equivalence for the editions indicated: Corresponding Indian Standard Degree of International Standard Equivalence ISO 225:1983 IS 8536:1987 Fasteners—Bolts, screws, studs and Identical nuts—Symbols and designation of dimensions (first revision) ISO 286-1:1988 IS 919(Part 1):1993 ISO systems of limits and fits: do Part 1Basis of tolerances, deviations and fits (second revision) ISO 286-2:1988 IS 919(Part 2):1993 ISO systems of limits and fits: do Part 2 Tables of standard tolerance grades and limit deviations for holes and shafts (second revision) ISO 885:2000 IS 4172:1987 Dimensions for radii under the head of Identically . bolts and screws (first revision) ISO 965-3:1998 IS 14962(Part 3):2001 ISO General purpose metric do screw threads —Tolerances : Part 3 Deviations for . constructional screw threads 1s0 1101:2000 IS 8000( Partl ):1985 Geometrical tolerancing on Identicalz) technical drawings: Part 1 Tolerances for form orientation, location and run-out and appropriate geometrical definitions (first revision) “1 (Continued on third coved 1)~dentic~l~i~ ISO885:1978. ‘4 ldenti~~l ~~ ISO 1101:1983 IS 1367 (Part 2) :2002 1s0 4759-1 :2000 Contents Page 1 Scope ..............................................................................................................................................................1 2 Normative references ....................................................................................................................................2 3 Tolerances for metric bolts, screws and studs ..........................................................................................3 4 Tolerances for metric nuts ..........................................................................................................................25 5 Tolerances for tapping screws ...................................................................................................................36 Annex A (informative) Tolerances ...........................................................................................................................44 Annex B (informative) Examples of dimensioned and tolerance fasteners ......................................................46 Annex C (informative) Examples of gauges and other measuring devices ........................................................49 IS 1367 (Part 2) :2002 1s0 4759-1 :2000 Indian Standard TECHNICAL SUPPLY CONDITIONS FOR THREADED STEEL FASTENERS PART 2 TOLERANCES FOR FASTENERS — BOLTS, SCREWS, STUDS AND NUTS — PRODUCT GRADES A, B AND C ( Third Revision) 1 Scope This part of ISO 4759 specifies a selection of tolerances for bolts, screws, studs and nuts with ISO metric threads and with product grades A, Band Cand for tapping screws with product grade A. NOTE The product grades refer to the size of the tolerances where grade A isthe most precise and grade C isthe least precise. The tolerances, except tolerances for threads, are selected from the system of limits and fits specified in ISO 286-1 and ISO 286-2. The tolerances for metric threads are taken from the series of tolerance classes specified in ISO 965-3. The tolerances for tapping screw threads are covered in ISO 1478. The tolerances of form and position are specified and indicated in accordance with ISO 1101, ISO 8015 and ISO 2692. The tolerances specified in this part of ISO 4759 apply to fasteners prior to coating unless otherwise specified. See also ISO 4042. Deviations from the tolerances specified in this part of ISO 4759 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 part of ISO 4759 and the product st a ndard, the product standard takes precedence. Itis recommended that these tolerances also be used for non-standard fasteners. Dimensions and tolerances given in this part of ISO 4759 are in millimetres. -. IS 1367 (Part 2) :2002 1s0 4759-1 :2000 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 4759. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO4759 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 225:1983, Fasteners — Bolts, screws, studs and nuts — Symbols and designation ofdimensions. ISO 286-1:1988, /S0 system of limits and fits — Part 1:Bases of tolerances, deviations and fits. ISO 286-2:1988, /S0 system of limits and fits — Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts. ISO 885:2000, General purpose bolts and screws — Metric series — Radii under the head. ISO 965-3:1998, ISO general purpose metric screw threads — Tolerances — Part 3: Deviations for constructional screw threads. ISO 1101:2000, Geometrical Product Specifications (GPS) — Geometrical tolerancing — Tolerances of form, orientation, location and run-out. ISO 1478:1999, Tapping screws thread. ISO 1479:1983, Hexagon head tapping screws. ISO 2692:1988, Technical drawings — Geometrical tolerancing — Maximum material principle. ISO 4032:1999, Hexagon nuts, style 1— Product grades A and B. ISO 4042:1999, Fasteners — Electroplated coatings. ISO 4757:1983, Cross recesses for screws. ISO 7053:1992, Hexagon washer head tapping screws. ISO 7721:1983, Countersunk head screws — Head configuration and gauging. ISO 8015:1985, Technical drawings — Fundamental tolerancing principle. ISO 10509:1992, Hexagon flange head tapping screws. ISO 10642:1997, Hexagon socket countersunk head screws. ISO 10664:1999, Hexalobular internal driving feature for bolts and screws. \ 2 IS 1367 (Part 2) :2002 1s0 4759-1 :2000 3 Tolerances for metric bolts, screws and studs 3.1 Dimensional tolerances Symbols and designations of dimensions are specified in ISO 225. Tolerance for product grades Feature Notes A B c .1.1 Tolerance level ;hank and bearing surface close close wide )ther features close wide wide 1.1.2 External thread 6g 6g 8g For certain products and (but 6g for coatings, other property tolerance classes class 8.8 for threads may and hi9W be specified in th( relevant product and coating standards. 1,1.3 Driving features s Tolerance s Tolerance 1.1.3.1 External <30 h13 < 18 h14 1.1.3.1.1 Width across flats >30 h14 >18 <60 h15 >60< 180 h16 >180 h17 —— ——— I s Q Figure 1 -4- S B Figure 2 3 .— IS 1367 (Part 2) :2002 1s0 4759-1 :2000 Tolerance for product grades Feature Notes A B c 3.1.3.1.2 Width across corners e~in= 1,13 S~i” emin= 1,12 ~minfor bolts and screws with flange —— w and other cold forged heads without trimming -t- operation a Figure 3 t?~in= 1,3 $~i” “+- t Q Figure 4 3.1.3.1.3 Height of head R= @ F ‘s’4 ‘s’5 “ ‘“’F Figure 5 \, \