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 9519 (2005): Fasteners - Hexagon products - Width across flats [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 9519:2005 ISO 272:1982 tiwi W–Fl-?h-w$i”ih GFi–TF– @-dwiT?m’dk@. Indian Standard FASTENERS — HEXAGON PRODUCTS — WIDTH ACROSS FLATS . ( First Revision) ICS 21.060.01 @BIS 2005 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 March 2005 Price Group 2 Bolts, Nuts and Fasteners Accessories Sectional Committee, MGP 33 NATIONAL FOREWORD This Indian Standard (First Revision) which is identical with ISO 272: 1982 ‘Fasteners _ Hexagon products — Width across flats’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendations of the Bolts, Nuts and Fasteners Accessories Sectional Committee and approval of the Medical Instruments, General and Production Engineering Division Council. The original version of this standard was issued in 1980. This first revision has been made by adoption of latest edition of ISO 272 published in 1982 to make pace with the latest developments taken place at international level. The text of ISO Standard has been approved as suitable for publication as an 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 a decimal marker, while in Indian Standards, the current practice is to use a point (.) as a decimal marker. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test, shall be rounded off in accordance with IS2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. IS 9519:2005 ISO 272:1982 Indian Standard FASTENERS — HEXAGON PRODUCTS — WIDTH ACROSS FLATS ( First Revision) 1 Scope and field of application ThisInternational Standard apacifieawidths acrossflatsforhexagonproducts, forexample hexagon headboltsandscrews, hexagon nutsand hexagon flanged bolts, screws and nuts, to be usedinthe respective product standards. Italsospecifiesalogicalratiobetween underhead (ornut)bearingarea(which determines themagnitude ofthecompressive stresson tha bolted members ralative tg the clamping force applied bv the fastener) and the tensile stressarea of the screw thread (which governs the clarnpiti force which can be developed by tightening the fastener for any particular strength classof fastener). This calculationtechnique wasappliedtoeach ofthe hexagon seriessothat apropergrading ofbaaring area/stress arearatioswould be availableto engineering designers. 1 IS 9519:2005 ISO 272: 1982 2 Dimensions + 63 El s f!? s u--l Dimensions inmiliimetres Oimeneions inmiilimatrea Thread I Width across fiatss Thread Width across diameter Series Flenged products diameter flatss d I d normal series Normal I Large Bolts , Nuts 1,6 3,2 — — — 42 65 2 4 — — — 46 m 2,5 5 — 46 75 3 5,5 — — — 62 e) 66 65 4 7 — — — 60 ’80 5 8 — 7 6 64 85 6 10 8 10 66 lat 7 11 — — — 72 105 6 13 10 13 10 16 — 13 15 76 110 so 115 12 16 21 15 18 65 lm 14 21 24 16 21 m 130 16 24 27 21 24 16 27 30 — — 65 135 100 145 20 30 34 27 w 22 34 36 — 106 150 24 36 41 — 110 155 27 41 46 — — 116 165 30 46 50 — — 120 lm 126 160 33 w 65 — — 130 1= M 55 60 — — 3s 60 es — 140 200 160 210 IS 9519:2005 ISO 27.2:1982 3 Ratio of bearing area to stress area Thefollowing graph shows the ratiosfor the normal, largeand hexagon flange series(hexagon flange boltsand nutahavecommon flange diameters), ineach casethe across-flats dimension being ahown against the appropriate point on each curve. Old Iwxegon sizeshavealw beenincludedtoindicatethachangeswhichware found nacaaaaryintheinterestsofinternational standardization and optimization. “1 ---.. --” ----- _____+ Hexagonal flange sariaat) .- 3 .0- : t 1) Still underconaidaration. 3 Bureau of Indian Standards BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote harmonious development of the activities of standardization, marking and quality certification of goods and attending to connected matters in the country. Copyright 61S has the copyright of all its publications. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. This does not preclude the free use, in the course of implementing the standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating to copyright be addressed to the Director (Publication), BIS. Review of Indian Standards I Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewed periodically; astandard along with amendments is reaffirmed when such review indicates that I no changes are needed; if the review indicates that changes are needed, it is taken up for revision. i Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ’61S Catalogue’ and ‘Standards: Monthly Additions’. 1 ~q This Indian Standard has been developed from Dot: No. MGP/BP 33 (0397). .: Amendments Issued Since Publication ~ Amend No. Date of Issue Text Affected BUREAU OF INDIAN STANDARDS Headquarters: Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telephones 23230131,23233375,2323 9402 website: www.bis.org.in Regional Offices: Telephones Central : Manak Bhavan, 9 Bahadur Shah Zafar Marg 23237617 NEW DELHI 110002 { 23233841 Eastern : 1/14 C.I.T. 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