Value Collection 221043PR Shoulder Screw 5/16 in Alloy Steel

Product Description

The VALUE COLLECTION 221043PR is a hex socket shoulder screw manufactured from Grade 8 alloy steel with an uncoated finish. The shoulder measures 0.312 inches in diameter and 1-3/4 inches in length, providing a precision bearing surface for rotating or sliding components. The 1/4-20 UNC threaded section locks the fastener in place, while the 5/32-inch hex socket drive allows installation with a standard hex key. This screw is used in mechanical assemblies, fixtures, and tooling applications where a precision-ground cylindrical shoulder is required. Installation is typically performed by machinists, maintenance technicians, or mechanical assemblers.

Shoulder screws of this type are commonly used in industrial machinery, jigs, fixtures, and die sets where a hardened, close-tolerance shaft surface is needed to guide or pivot a mating component. The 5/16-inch shoulder diameter and 1-3/4-inch shoulder length suit moderate-depth assemblies requiring a reliable pivot pin or stripper bolt function. The Grade 8 alloy steel construction supports high-load and high-cycle applications in manufacturing and maintenance environments.

Key Features

• 5/16-inch shoulder diameter (0.312 inches decimal) for precise fit in mating bores
• 1-3/4-inch shoulder length provides adequate bearing surface for most fixture applications
• 1/4-20 UNC threaded end with Grade 8 alloy steel construction for high tensile strength
• 5/32-inch hex socket drive for use with standard Allen or hex keys
• Uncoated finish — suitable for use as-is or with applied lubrication or coating
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as a standard shoulder screw for use in jigs, fixtures, die sets, and general mechanical assemblies requiring a 5/16-inch shoulder diameter and 1/4-20 UNC threaded engagement.

Installation Notes

Install using a 5/32-inch hex key; do not use power tools without torque control, as overtightening can damage the threaded bore. Ensure the mating bore diameter is matched to the shoulder diameter tolerance before assembly. Clean and inspect the bore for burrs or debris prior to installation. Always follow applicable ASME fastener standards and facility-specific torque procedures.