BSI BS 2 A 59 Cadmium-Plated Steel Hexagonal-Headed Bolts (B.A. and B.S.F. Threads) with Close Tolerance Shanks for Aircraft - PD 4732: November 28, 1962; PD 5302: August 12, 1964; AMD 2111: October 29, 1976; AMD 5750: November 30, 1987; AMD 7659: April 1
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