Socket Head Cap Screw Reference

Why Socket Head Cap Screw Data Matters

Socket head cap screws (SHCSs) are the default fastener in machine design — they pack high clamping force into a small head that fits inside counterbores. Knowing the exact head diameter and height is essential for designing clearance pockets and counterbore depths.

• Head diameter is approximately 1.5x the nominal screw size — a 3/8-16 SHCS has a 9/16-inch head diameter
• Counterbore depth should be head height plus 0.010-0.020 inch clearance so the head sits below flush
• Body diameter (unthreaded shank) is critical for dowel-fit applications where the screw also locates the joint

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