BSI BS 2A 173 + A7 Specification for 100В° Countersunk head steel bolts (Unified threads), cadmium plated, for aircraft - AMD 4655: October 1962; AMD 4735: November 1962; AMD 5312: August 1964; AMD 6164: May 1967; AMD 2123: October 1976; AMD 5385: July 19
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