BS EN 4161:2019 Aerospace series. Screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated. Classification: 1 100 PMa (at ambient temperature)/235 °C

Metal plating
Recessed-head fasteners
Aircraft components
Threaded fasteners
Marking
Dimensions
Fasteners
Weight (mass)
Pan-head fasteners
Metal coatings
Screws (bolts)
Designations
Cadmium
Alloy steels
Surface treatment
Cruciform-head fasteners
Threads

Link: BS EN 4161:2019 Aerospace series. Screws, pan head, offset cruciform recess, coarse tolerance normal shank, long thread, in alloy steel, cadmium plated. Classification: 1 100 PMa (at ambient temperature)/235 °C
Source: BSI Standards