1. This British Standard specifies the materials, dimen-sions and inspection requirements for corrosion-resisting steel pan head bolts with Unified threads for aircraft.
BS 3A 117:1962 history
1962BS 3A 117:1962+A2:2016 Aerospace Series. Bolts, Pan Head, Slotted Drive, Unified Threads, Corrosion Resisting Steel, Strength Class 880 MPa, for Aircraft. Specification
1962BS 3A 117:1962 Specification for corrosion-resisting steel pan head bolts (Unified threads) for aircraft