BS 4463:1969 pdf free download.Specification for crinkle washers for general engineering purposes – Metric series.
BS 4463:1969 specifies the dimensions tolerances and general requirements for metric series crinkle washers suitable for use with metric series crinkle washers suitable for use with metric threaded fasteners in the range 1.6 mm (M1. 6) to 20 mm (M20) diameter inclusive.
2 Material and mechanical properties
2.1 The material to be used for the manufacture of crinkle washers to this specification shall be subject to agreement between the manufacturer and the purchaser and be in accordance with the appropriate British Standard specification for material such that after suitable heat treatment,the products are capable of meeting the test requirements specified in Clause 7.
3 Finish
Unless otherwise specified crinkle washers complying with this British Standard shall be of “natural” self-colour finish.
4 Freedom from defects The surfaces of the washers shall be clean, smooth and free from scale or harmful defects.

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