100C500KCS, 1-8 x 5 In. Standard Socket Head Cap Screw Alloy Steel Black Oxide Finish
Standard socket head cap screws typically supply higher tensile strength, better yield strength, and more shear strength than equivalent sizes of hex head cap screws; yet they require less counter-bore because they are internally wrenched. These socket head cap screws feature a hexagonal center recess in the head for tightening with an Allen wrench or hex key. With no sideclearance restrictions, they can be placed close together and are ideal for assemblies with close tolerances.
ASTM A574/ANSI B 18.3