Value Collection 221085PR Shoulder Screw 3/8 in Grade 8

Product Description

The VALUE COLLECTION 221085PR is a Grade 8 alloy steel shoulder screw designed for precision mechanical assemblies requiring tight tolerances and controlled bearing surfaces. The shoulder measures 0.375 inches in diameter and 3 inches in length, providing a smooth, hardened shaft that functions as a pivot, guide pin, or bearing surface within a mechanism. The threaded portion is 5/16-18 UNC. Drive engagement is via a 3/16 inch hex socket. The uncoated finish leaves the steel in its natural state, suitable for applications where plating or coating is not required.

Shoulder screws of this type are commonly installed in jigs, fixtures, cams, linkages, and pivot assemblies across industrial machinery, tooling, and fabrication equipment. The 3-inch shoulder length makes this screw appropriate for assemblies requiring extended bearing engagement or spacing between components. Machinists, tool and die makers, and maintenance technicians are the typical users who specify and install this fastener. It is sold in a minimum order quantity of 5 units per order.

Key Features

• 0.375 inch shoulder diameter with precise 0.375 decimal inch tolerance for accurate fits in bored holes
• 3 inch shoulder length for extended pivot or guide applications
• 5/16-18 UNC thread for secure clamping into threaded mounting holes
• Grade 8 alloy steel construction for high tensile strength and wear resistance
• 3/16 inch hex socket drive for installation with standard Allen wrenches or hex bits
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as a standard shoulder screw for use in industrial fixtures, jigs, pivots, linkages, and mechanical assemblies that require a 3/8 inch diameter shoulder, 5/16-18 UNC thread, and a 3 inch shoulder length per ANSI B18.3 and ASME/ANSI B18.3 specifications.

Installation Notes

Installation is performed by machinists or mechanical technicians using a 3/16 inch hex key or Allen driver. The mating hole for the shoulder should be bored or reamed to match the shoulder diameter for proper fit and function. Ensure the receiving threaded hole is clean and the correct 5/16-18 UNC thread form before driving the fastener. De-energize or lock out any machinery before replacing or installing shoulder screws in live assemblies.