Value Collection 225121PR Shoulder Screw 1/2 in 4140 Steel

Product Description

The VALUE COLLECTION 225121PR is a hex socket shoulder screw machined from 4140 alloy steel, designed for precise locating, pivoting, and bearing retention applications in mechanical assemblies. It features a 1/2-inch shoulder diameter and a 2-inch shoulder length, providing a smooth, ground surface that acts as a bearing or pivot pin within a bored hole. The 3/8-16 UNC threaded section draws the screw firmly into the mating component, while the 3/4-inch diameter head seats cleanly against the surface. Drive engagement is through a 1/4-inch hex socket, requiring an Allen key or hex bit driver for installation. Machinists, maintenance technicians, and mechanical assemblers are the primary installers.

This shoulder screw is suited for use in fixtures, jigs, dies, machine tools, conveyor assemblies, linkage mechanisms, and general industrial equipment where a hardened, precision-diameter shank is required to guide motion or retain a bearing, bushing, or spacer. The 4140 alloy steel construction provides high tensile strength and wear resistance appropriate for demanding load and cycle conditions. Sold individually per package with a minimum order quantity of 5 units.

Key Features

• 1/2-inch shoulder diameter with a 2-inch shoulder length for precise fit in bored locating holes
• 3/8-16 UNC thread for secure engagement into tapped mating components
• 4140 alloy steel construction for high strength and wear resistance
• 1/4-inch hex socket drive for installation with standard Allen keys or hex bit drivers
• 3/4-inch head diameter and 5/16-inch head height for positive seating against the work surface
• Meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards

Compatibility

Designed as an OEM-style replacement or standard-specification shoulder screw for industrial machinery, fixtures, and mechanical assemblies requiring a 1/2-inch shoulder diameter, 2-inch shoulder length, and 3/8-16 UNC thread.

Installation Notes

Installation is performed by qualified machinists or maintenance technicians. De-energize and lock out all equipment before servicing any assembly containing this fastener. Use a calibrated 1/4-inch hex key or bit driver to torque the screw into the tapped receiver; ensure the shoulder seats fully into the precision bore before final tightening. Do not substitute thread lubricants or sealants unless specified by the equipment manufacturer.