Value Collection 225076PR Shoulder Screw 3/8 in 4140 Alloy Steel

Product Description

The VALUE COLLECTION 225076PR is a hex socket shoulder screw manufactured from 4140 alloy steel, designed for precision mechanical assemblies that require a tight-tolerance cylindrical shoulder as a bearing, pivot, or alignment surface. The shoulder measures 3/8 inch in diameter and 2-1/4 inches in length, providing a smooth, accurate mating surface for bushings, linkages, and rotating components. The 5/16-18 UNC threaded end anchors the fastener into tapped holes, while the hex socket drive accepts a 3/16 inch hex key for installation in confined spaces. The 9/16 inch head diameter and 1/4 inch head height seat flush against mating surfaces without excessive protrusion. Meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards.

This shoulder screw is suited for use in industrial machinery, jigs, fixtures, robotic assemblies, and general mechanical fabrication where a precision pivot or guide post is required. The 4140 alloy steel construction provides high tensile strength and wear resistance, making it appropriate for demanding dynamic load applications. Machinists, millwrights, maintenance technicians, and mechanical assemblers commonly specify this fastener type when bushings, rollers, or linkage arms must rotate or slide freely on a controlled-diameter shaft while the threaded portion remains stationary.

Key Features

• 3/8 inch shoulder diameter with 0.3750 inch decimal precision for tight-tolerance fits
• 2-1/4 inch shoulder length accommodates typical bushing stack depths
• 4140 alloy steel construction for high strength and wear resistance
• 5/16-18 UNC thread for secure anchoring in standard tapped holes
• 3/16 inch hex socket drive enables installation in restricted access areas
• Meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards

Compatibility

Designed as a standard shoulder screw replacement for precision mechanical assemblies requiring a 3/8 inch shoulder diameter and 5/16-18 UNC threaded shank per ASME/ANSI B18.3 specifications.

Installation Notes

Installation is performed by a machinist or mechanical technician using a 3/16 inch hex key. Ensure the tapped receiving hole is clean and meets the 5/16-18 UNC thread specification before installation. Do not exceed the torque rating of the threaded portion, and avoid applying torque loads to the shoulder itself. Inspect the shoulder surface for nicks or burrs prior to inserting bushings or rollers, as surface damage will affect fit and rotation quality.