Historical
BS EN 4161:2009
Aerospace series. Screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated. Classification: 1100 MPa (at ambient temperature) / 235 $0DC (British Standard)
This European Standard specifies the characteristics of screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated.
Classification: 1 100 MPa1) / 235 °C2).
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British Standards Institution [bsi]