Allen Screws

Socket Head Cap Screws

Socket Head Cap Screws (SHCS) are high-strength fasteners featuring a cylindrical head and an internal hexagonal drive designed to withstand substantial tightening torque. Manufactured predominantly from heat-treated alloy steel conforming to Class 12.9 or 10.9 standards, they deliver superior tensile and yield strength compared to standard hex bolts. The recessed drive mechanism facilitates top-down installation in tight clearances, making them indispensable in CNC machinery, aerospace engines, and high-stress industrial tooling fixtures.

Socket Head Cap ScrewSHCSInternal Hex DriveHigh-Tensile SteelClass 12.9Counterbored FastenerSpace-SavingPrecision Fastener

Specifications

Standards

ASTM F835DIN 912ISO 4762ASTM F837ASTM A574

Materials

Carbon SteelAlloy SteelStainless Steel (A2)Stainless Steel (A4)

Grades

8.810.912.9A2-70A4-70

Head Styles

Cylindrical HeadKnurled Head

Drive Types

Hexagonal Socket (Allen)

Finishes

Black OxideZinc PlatedElectroless NickelZinc Flake CoatingPTFE

Thread Types

Metric CoarseUNCUNF

Thread Fit

Class 3AClass 2A

Tensile Strength170,000 - 190,000 psi

Hardness38–44 HRC

Socket Head Cap Screws — Full Specifications

Our socket head cap screws are available in a range of sizes, materials, and standards. Contact us for a detailed specifications sheet and competitive bulk pricing.

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