IS 3063 (1994): Fasteners - Single coil rectangular ...

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2 IS 3063 (1994): Fasteners - Single coil rectangular section spring lock washers [PGD 31: Bolts, Nuts and Fasteners Accessories]. ! $ ' + - . Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge . ! > 0 B .. Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen . IS 3063 : 1994. ( Reaffirmed 2004 ). Indian Standard Fasteners -SINGLECOTLRECTANGULAR. SECTIONSPRINGLOCKWASHERS- SPECIFICATION. (Second Revision ). Second Reprint OCTOBER 1997. UDC Q BIS lY94. BUREAU OF INDIAN STANDARDS. MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG. NEW DELHI 110002. March 1994 Price Groop 4. Bolts, Nuts and Fasteners Accessories Sectional Committee, LM 14. FOREWORD. This Indian Standard ( Second Revision ) was adopted by the Bureau of Indian Standards, after the draft finalized by the Bolts, Nuts and Fasteners Accessories Sectional Committee had been approved by the Light Mechanical Engineering Division Council.

3 The rectangular section spring lock washers are suitable for use with bolt/nut assemblies of property class or less. For higher property classes other sections such as waveform, conical, etc, are generally used. steel spring lock washers serve to counteract the loss in inherent tension caused by setting or creep of a bolt/nut assembly provided that they are sufficiently resilient to increase. the overall resilience of the assembly and that their inherent springiness can compensate for any loss in tension so that the clamping force required to ensure the reliability of the assembly is maintained. There may be a relative movement between bolt and nut if the friction between the clamped components is overcome by transverse forces. If this does occur, loosening of the assembly cannot be prevented by spring lock washers.

4 Thus, when using these components, it should be checked whether the spring lock washers may useful)y be applied as the elements maintaining the clamping force. This standard was originally published in 1965 and revised in 1972. In the present revision following major changes have been made: a) The title and scope have been modified. b) Permanent set test has been modified and aligned with DIN 127 : 1987. c) Permanent load test has been incorporated in line with DIN 127 : 1987. d) Free height of spring lock washers has been incorporated in the table of dimensions. e) Non-preferred sizes have been covered under separate table. f) spring force test has been incorporated in Annex A for information. In preparation *of this standard assistance has been derived from: DIN 127-1987 < spring lock washers with square ends or tang ends'.

5 DIN 267 ( Part 26 ) : 1987 Fasteners - Technical supply conditions - Steels spring washer for bolt/nut assemblies'. IS 3063:1994. Indian Standard Fasteners -SINGLECQILRECTANGULAR. SECTIQNSPRINGLOCKWASWERS- SPECIFICTAION. /Second Revision ). 1 SCQPE 7 FINISH. This standard covers requirements for Single spring lock washers shall be supplied in natural coil rectangular section spring lock washers finish unless otherwise specified by the pur- suitable for use with bolt/nut assemblies involv- chaser. At the request of the purchaser washers ing Fasteners of property class or less in the may be phosphate coated, nickel plated, tinned, size range 2 to 100 mm. electrogalvanized, copper plated or cadmium plated. The functional properties of the spring 2 REFERENCES lock washers shall not be impaired as a result of the protective coatings.

6 These coated The following Indian Standards are necessary washers shall be subjected to appropriate adjuncts to this standard: treatment as given in the relevant electroplating 1s No. Title standard to avoid hydrogen embrittlement. 1501 Method for vickers hardness NOTE - The use of hot dip galvanized spring lock ( Part 1 ) : I984 test for metallic materials: washers is not recommended as it entails the loss of Part 1 HV 5 to HV 100 physical propeities during the process of galvaniz- ing. ( second revision ). 4072 : steel for spring washers 8 DESIGN AT ION. (first revision ) The spring lock washers shall be designated by 6821 : 1973 Methods for sampling non- the nomenclature, type, nominal size, the num- threaded Fasteners ber of this standard and the surface protection, if any.

7 3 TYPES. Example: The spring lock washers shall be of following A spring lock washer of nominal size two types: 10 mm, Type A and with phosphate Type A - spring lock washers with bent coating shall be designated as follows: ( deflected or tang ) ends. spring Lock Washer A10 - IS 3063. Type B - spring lock washers with flat Phosphate coated ( square ) ends. case the spring washer is intended for use with LH thread, the designation shall be 4 DIMENSIONS modified as follows: The dimensions of the spring lock washers shall spring Lock Washer LH-A 10 IS 3063. be as given in Tables 1A and IB. Phosphate coated 5 MATERIAL 9 GENERAL REQUIREMENTS. The spring lock washers shall be made from The flat faces of washers and the inner and suitable steel according to IS 4072 : 1975 to outer peripheries shall be smooth and free from meet the requirements specified.

8 Knurling, serrations, die-marks, deep scratches etc, although slight feed roll marks shall bi 6 HEAT TREATMENT permissible. The spring lock washers after coiling shall be Washers shall also be free from burrs, rust, suitably heat treated to a hardness of HV 430 pit marks, loose scale and defects that might to 530. affect their serviceability. 1. IS 3063 : 1994. The clearances and angles of the cut ends Twist Test shall be in such degree so that the washers do not cause lapping when they are completely A portion of the washer shall be gripped in vice compressed and shall not be liable to tangle or jaws and then equal portion shall be gripped in link together when in the free condition. wrench jaws as shown in Fig. 1. Edges of the wrench jaws shall be sharp and parallel to the 10 SAMPLING AND ACCEPTANCE vice jaws.

9 The wrench shall then be rotated in a direction that increases the free height of the The sampling and acceptance criteria shall be spring lock washer till the washer is, twisted in accordance with IS 6821 : 1973. through an angle of 90 . The washer shall show no sign of fracture. 11 TESTS. Test 12 PACKING. The hardness shall be tested in accordance with Unless otherwise specified, spring lock washers IS 1501 ( Part 1 ) : 1984. For checking hardness, shall be packed in cartons of 100, 500 or 1 000. the washers shall be lightly ground to assure Each carton shall contain spring lock washers the removal of a decarburized or plated of one size only. surface. The values shall be measured, where possible, in the middle of the washer surface at 13 MARKING. the point of contact with the supporting surface.

10 Each carton containing the spring lock washers shall be marked with the following: Permanent Set Test a) Indication of source of manufacture, The spring lock washer shall be compressed b) Nominal size, between hardened, flat ground washers ( with a c) Type, and hardness of not less than 60 HRC ) for two minutes using the compression loads specified d) Quantity. in Tables 2A and 2B. BIS Certification Marking The free height of the washers after release of load shall not be less than the values specified The product may also be marked with Standard in Tables 2A and 2B. Mark. Permanent Load Test ;1 The use of the Standard Mark is governed by the provisions of Bureau of Indian Standards Ten spring lock washers, threaded on a bolt and Act, 1986 and the Rules and Regulations made separated from one another by parallel-faced thereunder.