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 2540 (2008): Dimensions for threaded centre holes [PGD 20: Engineering Standards] “!ा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” . . 01 0 BIS 2008 BUREAU MANAK September 2008 OF BHAVAN.IS 2540:2008 Indian Standard DIMENSIONS FOR THREADED CENTRE HOLES ( First Revision) ICS 25. INDIAN STANDARDS 9 BAHADUR SHAH NEW DELHI 110002 ZAFAR MARG Price Group 1 .080. the final value. In the present revision. the standard is revised in line with the latest standard DIN 332 Teil 2 — 1983 ‘Centre holes 60° with threads for shaft ends for rotating electrical machines’. after the draft finalized by the Engineering Standards Sectional Committee had been approved by the Production and General Engineering Division Council. to the manufacturing This standard is one of a series of Indian Standards related to centre holes. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. expressing the result of a test or analysis. This standard was first published in 1963 and was basedonCSN0149171956’60° Threaded centre holes’. observed or calculated. which corresponds available tools. Duetscher Normenausschuss. shall be rounded off in accordance with IS 2:1960 ‘Rules for rounding off numerical values (revised)’. . Urad Pro Normalisaci and DIN 332 Blatt 2 — 1960’60° Threaded centre holes’.E Engineering Standards Sectional Committee. PG 20 ~> FOREWORD This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards. Other standards types depending on the published so far in the series are: is No. This standard covers three forms of centre holes. 2289:1976 2473:1975 6708:1977 6709:1977 6710:1997 Tide Specification for 60° dead centres for lathes (@f revision) Dimensions for centre holes (@t revision) Specification for centre drills type A (@t revision) Specification for centre drills type B (first revision) Specification for centre drills type R (jirst revision) For the purpose of deciding whether a particular requirement of this standard is complied with. 3 0.4 8.8 25.4 34.3 3. The forms of centre holes are functionally equivalent.4 0.4 5.8 8.1 23 28. for Centrehole M4 shaft dia must be minimum of 12 mm.2 5 6. without individual tolerance indications (third revision) Recommendations for drills for use prior to tapping screw threads Technical drawings — Simplified representation of centre holes 2 02 (Part 1) : 1993 10952: 1984/ ISO 2306:1972 11668:1985 Table 1 Dimensions t+d “e” as per IS 1369 (Parr 3) FIG.8 10.5 21 3.4 10. 1 . hence the choice of form is left to the manufacturers.”5 15 18 z Recommended Diameter Range of Shaft End dcz) (13) 7to 103) over 10 to 133) over 13to163) over 16 to 21 over 21 to 24 over 24 to 30 over 30 to 38 over 38 to 50 over 50 to 85 o~er 85 to 130 ‘)Guide value for drill diameter as per IS 10952. d.8 4.2 4 5 6 7. Threads dz’) d..4 8 0.2 6.4 2.3 8 10 16 20 25 31.7 8.+~ R d. z)For ~hafiends of non.5 3.5 16 19 22 28 36 42 50 ts tl Mirs t3+: (9) (10) (11) (12) 2.2 16.For Shafiends with throu~. d. (1) (2) (3) (4) (5) (6) (7) (8) 0 ii) iii) iv) v) vi) vii) viii) ix) $ M3 M4 M5 M6 M8 MIO M12 M16 M20 M24 2. keyway the diameter of shaft end must be minimum 10 mm for centre hole of M3.8 7. Centre holes as per this standard are meant for the assembly of pulleys and couplings with pressing tools.2 4.2 0.6 0. on of Threaded Centre Holes (Clause 3 and Fig. the medium grade of tolerances as per IS 2102 (Part 1) is applicable (see Fig.3 4. For dimensions without tolerances in Table 1.9 18. and for centre hole M5 shatl dia must be minimum of 16 mm.2 5.2 14 17.8 3.3 38 4 5 6.1 2.3 1. 1) sl No.4 0.5 40 9 10 12.7 1.5 1.circulm cross-sectional form the smallest dimensionk validas & 3. F!!!!!! IS 2540:2008 Indian Standard DIMENSIONS FOR THREADED CENTRE HOLES (First Revision) 1 SCOPE 3 DIMENSIONS This standard prescribes the dimensions of threaded centre holes with 60° countersink. Title 1369 (Part 3) : 995 Fasteners –Thread run-outs and undercuts: Part 3 Dimensions for screw thread run-outs and undercuts for internal threads (Blind tapped holes) (third revision) General tolerances: Part 1 Tolerances for linear and angular dimensions.3 6.3 5. 1 DIMENSIONFORTHREADEDCENTREHOLE 4 DESIGNATION Designation d.= M8 of a centre hole form DR with thread Centre Hole DR.2 14.3 19.5 13.0 1.3 6.6 12.6 12 14 17 21 25 30 37 45 53 63 t~ ~ 1.5 13 17 21 25 5.3 0. t.3 31.6 3. but not for transportation with eyebolts.4 8. KEY 2 REFERENCES The following standards are necessary adjuncts to this standard: IS No.1 9.5 10. For smaller diameters of shatl ends the corresponding centre holes can be used only if there is no through key way or there is no key way. 1).M8 IS 2540 Example for details as per IS 11668 for indication drawing.8 2. IS 2540:2008 0 e L’Q-l U-J DEAD CEN TRE -/ Form D Without protective countersinking with straight contact surface Form DR with surface spherical contact Form DS countersinking surface FIG 2 ENLARGEDVIEW OF THREADEDCENTREHOLE (DETAIL X. FIG. 3 REPRESENTATION J with protective with straight contact . 1) IS:2540-DR I IN DRAWINGS FIG. Road. it is taken should ascertain that they are in possession of the latest amendments Monthly Additions’. This does not preclude the free use. RAJKOT. IV42ross Road. PUNE. E9 MIDC. PARWANOO. : AHMEDABAD. Scheme VII M. type or grade designations. 9 Bahadur Shah Zafar Marg NEW DELHI 110002 23237617 { 23233841 Eastern : 1/14 C. BHOPAL. PG 20 (0550).23379120 2603843 { 2609285 160022 Printed by Prabhat Offset Press . Enquiries relating to copyright be addressed to the Director (Publications). Sector 34-A. No part of these publications may be reproduced in any form without the prior permission in writing of BIS. of comments. THIRUVANANTHAPURAM.e!!!!!! of Indian Standards Bureau 131S is a statutory established under the Bureau of the activities of standardization. 23378499. I. KANPUR. such as symbols and sizes.23378561 { 23378626. a standard along with amendments is reaffirmed when needed. LT. BHUBANESHWAR. FARIDABAD.2323 9402 Telegrams : Manaksanstha (Common to all offices) Telephone RegionaI Offices : Central : Manak Bhavan. Review of Indian Standards Amendments are issued to standards as the need arises on the basis periodically. institution harmonious development and attending to connected of Indian Standards Act. ‘BIS Catalogue’ and ‘Standards: This Indian Standard has been developed from DOC : No. of necessary details. Campus. Andheri (East) MUMBAI 400093 28329295. 1986 to promote marking and quality certification of goods Copyright BIS has the copyright of all its publications.22541442 { 22542519. GUWAHATI. in the course of implementing the standard. V. New Delhi 110002 Telephones :23230131.28327858 28327891. JAIPUR. BIS. NAGPUR. BANGALORE.T. VISAKHAPATNAM. PATNA. Amendments Amend No. Marol. matters in the country.23233375.28327892 { Branches COIMBATORE. CHANDIGARH Southern : C. Standards are also reviewed such review indicates that no changes are up for revision. LUCKNOW. if the review indicates that changes are needed.I.22542315 Western : Manakalaya. HYDERABAD. CHENNAI 600113 22541216. 9 Bahadur Shah Zafar Marg. P. Kankurgachi KOLKATA 700054 Northern : SCO 335-336. Users of Indian Standards or edition by referring to the latest issue of Issued Since Publication Text Affected Date of Issue BUREAU OF INDIAN STANDARDS Headquarters : Manak Bhavan. GHAZIABAD.
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