Aerospace Series. Bolts, Pan Head, Slotted Drive, Unified Threads, Corrosion Resisting Steel, Strength Class 880 MPa, for Aircraft. SpecificationWhat is BS 3A 117 Aerospace series about? BS 3A 117 provides specifications and dimensions for manufacturing bolts and pan heads. BS 3A 117 specifies the materials, dimensions, and inspection requirements for corrosion resisting steel pan head bolts (Unified threads), Strength class 880 MPa, for aircraft. Who is BS 3A 117 Aerospace series for? BS 3A 117 on Aerospace series is useful for: Manufacturers of bolts and Panheads Aircraft manufacturers

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