इंटरनेटमानक 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” “The Right to Information, The Right to Live” “Step Out From the Old to the New” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru IS 7170 (1989): Slotted countersunk (flat) head tapping screws (common head style) [PGD 31: Bolts, Nuts and Fasteners Accessories] “!ान $ एक न' भारत का +नम-ण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह” है” ह Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” . . IS 7170 IS0 1482 : 1989 : 1983 ( Reaffirmed 2004 ) Indian Standard SLOTTED COUNTERSUNK ( FLAT) HEAD TAPPING SCREWS ( COMMON HEAD STYLE) ( First Revision ) UDC 621’993 : 621*882*21!5’3 I -0 @ BIS 1990 . .- BUREAUOF MANAK February 1990 BHAVAN. INDIAN STANDARDS 9 BAHADUR SHAH NEW DELHI 110002 ZAFAR MARG Price Group 3 . b) Types AB and B have been re-designated as types C and F. The following numbers. identical referring in Indian with to this have been those used standard.IS 7170 : 1989 ISa 1482 : 1983 Indian Standard SLOTTED COUNTERSUNK ( FLAT) HEAD TAPPING SCREWS ( COMMON HEAD STYLE ) ( NATIONAL First Revision) FOREWORD This Indian Standard ( First Revision ) which is identical sunk ( flat ) head tapping screws ( common for Standardization ( IS0 ) was adopted by the recommendation of the Bolts. a).5 (12) 14 ST 2. ) as the decimal marker.5 -- have been rationalized. respectively. The revision has been made by adoption of the revised IS0 standardThe following major changes have been made in this revision: IS0 1482 : 1983. as per IS 7170 : 1974 Corresponding Sizes in this Revision (0) Not covered (1) 2 Not covered ST 202 (3) 4 Not covered (5) 6 d) Dimensions are re-designated by the table gives old screw size Screw Size No. attention is specially drawn to the following: a) Wherever the words ‘International should be read as ‘Indian Standard’. The original version of this standard IS 7170 : 1974 ‘Specification for slotted countersunk ( flat ) head tapping ‘screws’ was based on lSO/R 1482 : 1970 ‘Slotted countersunk ( flat ) head tapping screws’ issued by ISO.8 ST 5. certain terminology and conventions are not in Indian Standards. with the corresponding new size designations: Screw Size No. c) Screw size numbers have been dispensed with and screw sizes nominal drameters prefixed with letters ST. they Standards the current .2 (7) 8 10 ST 4.5 ST 9. specifications covered in ISO’ 1482 : 1983 ln the adopted standard. Countersunk angle has been changed from 80” to 90”. as per IS 7170: 7974 Corresponding Sizes in this Revision Not covered ST 4. ) has been used as a decimal marker while practice is to use point ( . Standard’ appear. Nuts and and approval of the Mechanical Engineering with IS0 1482 : 1983 Slotted counterhead style )’ issued by the international Organization the Bureau of Indian Standards on 3 March 1989 on Fasteners Accessories Sectional Ccmmittee ( EDC 27 ) Division Council.9 Not covered ST 6’3 ST8 (16) Not covered ST 3. b) Comma ( . Additional requirements supplementing given in the National Annex. Bolts.6 and < 150 mm and product grades A. 2 . *Was in draft stage in 1983. $The provisions of this Indian Standard are applicable.Electroplated coatings components IS 1367 (Part 11 )t Technical supply conditions for threaded fasteners: Part 11 Electroplated coatings Would be identical IS0 475911 : 1978 Tolerances for fasteners. screws. and second edition in 1988.IS 7170: 1888 IS0 1102 : 1883 CROSS REFERENCES International Standard Indian Standard Degree of Correspondence IS0 225 : 1983 Fasteners .Mechanical perties IS0 3269 : 1988’ Acceptance inspection steel pro- ALTERATION In Clause 5 the designation ‘Tapping screw IS 7170 of slotted - in place of ‘Tapping screw IS0 1482 - countersunk IS0 1482 - ( fiat ) head tapping screw may be read as: ST3. Part 1 Bolts. screws. 5 x 16-C’. B and C IS 1367 ( Part 2 ) : 1984 Technical supply conditions for threaded steel fasteners: Part 2 Product grades and toierances ( second revision ) Technically equivalent Countersunk IS0 7721 : 1983 head screws . first edition published in 1964.Head configuration and gauging IS 11362 : 1985 Head configuration and gauging of countersunk head screws Identical Tapping screws IS0 2702 : 1974 Heat-treated tapping screws . studs and nuts . screws and nuts with thread diameters ) 1. 5 x 16-C’ ST3. studs and nuts .Bolts. *At present in draft stage.Symbols and designation of dimensions ( first revision ) Identical IS0 1478 : 1983 thread IS 6957 : 1989 Dimensions of screws for thread forming tapping screws ( first rewsion ) Identical IS 7178 : 1989 Technical conditions for tapping ( second revision ) supply screws Related Fasteners - IS 2614 : 1969: Method for sampling of fasteners ( first revision ) Related IS0 4042t Threaded components .Symbols and designation of dimensions IS 8536 : 1987 Fasteners . IS0 2702. B and c. inspection. 1) At presentat the stage of draft. 3 . This International Standard specifies the characteristics of slotted countersunk (flat) head tapping screws with thread sizes from ST 2. IS0 7721. Tolerances for fastdners grades A. tfeet. 1) IS0 475911. festeners - Bolts. Fasteners -‘Acceptance IS0 4042.5 inclusive. screws.IS 7170 : 1999 IS0 1692 : 1993 1 Scope and field of application 1. Tapping screws thread. 2 References IS0 22fi. 1) Electroplated coatings components.treated steel tapping screws IS0 3269. screws 8nd nuts with thread diameters > 1. Threaded components - Mechanical properties.2 to ST 9.6 and < 160 mm 8nd product Head configurations and gauging. studs and nuts - symbols and designations of dimensions. Countersunk head screws - Part 1: Bolts. IS0 1478. limits. pitch of the thread. from the underside of the head to the first major diameter 4) Length of incomplete 5J Sizes with lengths marked with a dash of the thread within specified thread. l-) in the table shall not be manufactured.4) 1) P = 2) Distance 3) See IS0 7721.IS 7170 : 1989 IS0 1492 : 1983 Type /r\ /Edge c rounded Tybe F or flat Dimensions y ref . in millimetres . according to IS0 2702 I According to IS0 1478 Thread Mechanical properties Tolerances According to IS0 2702 A Product grade International Standard Finish IS0 475911 I Plain Requirements for electroplating are covered in IS0 4042.5 x 16 .C 5 . Designation Example for the designation of a slotted countersunk (flat) head tapping screw with thread size ST 3. they should be negotiated between customerand supplier. nominal length I = 16 mm and cone end type C.ST 3. If different electroplating requirements are desired or if requirements are needed for other finishes.IS . Tapping screw IS0 1462 . Aqceptability 5 For acceptance procedure see IS0 3269.5.176 : 1889 ’ IS0 1482 : 1983 4 Specifications and reference International Material Standards Steel. IS 7170 : 1989 shall also comply with the following. not covered in this standard. GENERAL the self tapping screws manufactured to REQUIREMENTS In respect of such other requirements conform to IS 7178 : 1989.IS 7170 : 1989 NATIONAL ANNEX In addition to the requirements covered in the standard. the tapping screws shall . Copyright BIS has the copyright of all its publications. CHANDIGARH 160036 I 31641 2 1843 r41 1% Western : Manakalaya. Maniktola CALCUTTA 700054 36 24 99 Northern : SC0 445-446. Andheri BOMBAY 400093 24 42 600113 . Marol.Bureau of Indian BIS is a statutory promote Standards institution harmonious certification established development under the Bureau of the of goods and attending activities to connected of lndian Standards of standardization. the following EDC27 Indian or edition. 9 Bahadur Shah Zafar Marg NEW DELHI 110002 Eastern : l/14 if any. E9 MIDC. Regional should ascertain reference : Amendments Headquarters and revised. that they are in ( 4120) Amend No. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. GUWAHATI. I. in the course of implementing grade designations. JAIPUR. I. HYDERABAD.BANESHWAR. Standards are issued from be addressed to the Director (Publications). Campus. such as symbols and sizes. I. New Delhi 110002 Telephones : 331 01 31. when necessary and amendments. marking 1986 to and quality matters in the country. MADRAS Sector 35-C. i 331 01 137531 C. V. 331 13 75 Telegrams : Manaksanstha (Common to all Offices) Offices : Telephone Central : Manak Bhavan. Delhi. Standards Comments on this Indian Standard may be sent Issued Since Publication Date of lsssue BUREAU OF INDIAN Text Affected STANDARDS : Manak Bhavan. Southern : C. type or Enquiries relating to copyright of Indian Indian Standards are reviewed time possession to periodically time. BANGALORE. P. Doc:No. Road. of necessary details. IV Cross Road. T. Users of of the latest amendments to BIS giving BIS.: 1: (East) 6 32 92 95 Branches : AHMADABAD. This does not preclude the free use. BHU. Printed at Printograph. 9 Bahadur Shah Zafar Marg. BHOPAL. T. KANPUR. Revision the standard. Act. Scheme VII M. PATNA. TRIVANDRUM. Inx .