Countersunk Cap 1/2 x 2.1/4 UNC Black Gr.10.9 BS 2470

Countersunk Cap Screw
Hexagon Head
Black Imperial UNC
High Tensile Grade 10.9
Dia: 1/2'
TPI: 13
Length: 2.1/4'
BS 2470
Allen Key Size: 5/16'
A UNC countersunk head shoulder cap screw is a specialized imperial fastener that combines a flush-fitting head with an unthreaded shoulder. This hybrid design is primarily a custom or non-standard item, as standard UNC fasteners typically feature either a countersunk head (for flush finish) or a shoulder (for pivoting) but not both in a standard configuration.