1. This British Standard specifies the materials, dimen-sions, finish and inspection requirements for steel pan head bolts with Unified threads for aircraft.
BS 3A 116:1962 history
2012BS 4A 116:2012 Steel pan head bolts (Unified threads), cadmium plated for aircraft
1962BS 3A 116:1962 Specification for steel pan head bolts (Unified threads) for aircraft