Bulk #4-40 Low Head Socket Cap Screws – Alloy Steel Black Oxide Length:16000 Qty - #4-40 x 1/2" USS (United States Standard) flat

USS (United States Standard) flat washers feature a larger outer diameter compared to SAE washers

Integrated Washer Flange: Wide bearing surface distributes load—no separate washer needed

Corrosion Resistance: Zinc-yellow finish with CR+6 bake helps prevent rust

Undercut Flat Head: 82° countersunk head with undercut shank seats flush yet retains thread depth in thin materials

Bulk #4-40 Low Head Socket Cap Screws – Alloy Steel Black Oxide Length:16000 Qty - #4-40 x 1/2" USS (United States Standard) flatBulk #4 40 Low Head Socket Cap Screws Alloy Steel with Thermal Black Oxide Finish Bulk #4 40 Low Head Socket Cap Screws are designed for compact industrial assemblies where a standard socket head cap screw is too tall. Their reduced head height provides additional overhead clearance while retaining the space saving installation advantages of an internal hex drive. Also called low profile socket screws or low head Allen screws, these UNC coarse thread