A black 3/8″ – 16 allen head socket cap screw head, made of steel.

• Allen head socket cap screws feature a hexagonal recess in the head for tightening with hex keys or Allen wrenches.
• No side clearance restrictions mean that they are ideal for applications and assemblies with close tolerances.
• Since they are internally wrenched, Allen head socket cap screws need less counter-bore.
  They also usually have higher tensile strength, greater shear strength, and better yield strength than comparable sizes of standard hex head cap screws.
• Made of heat-treated alloy steel
• Finished with thermal or chemical black oxide