Value Collection 225055PR Shoulder Screw 3/8 in 4140 Alloy Steel

Product Description

The VALUE COLLECTION 225055PR is a hex socket shoulder screw machined from 4140 alloy steel, designed for precision mechanical assemblies where a smooth cylindrical bearing surface is required. The shoulder measures 3/8 inch in diameter and 5/8 inch in length, providing a close-tolerance pivot or guide surface. The threaded portion is 5/16-18 UNC. The hex socket drive accepts a 3/16 inch hex key for installation in tight or recessed spaces. This fastener meets ASME/ANSI B18.3, ASTM F835, and IFI 124 standards, making it appropriate for industrial, tooling, and machinery applications where dimensional accuracy and material strength are critical.

Shoulder screws of this type are commonly used in die sets, jigs, fixtures, cams, linkages, and pivot assemblies across manufacturing, maintenance, and repair operations. The smooth shoulder acts as a bearing surface or positive stop, eliminating the need for a separate dowel or bushing in many designs. Machinists, toolmakers, and maintenance mechanics typically install this fastener in light to medium-duty mechanical assemblies requiring repeatable positioning.

Key Features

• 3/8 inch shoulder diameter provides a precise bearing or pivot surface
• 5/8 inch shoulder length suits shallow pivot and guide applications
• 5/16-18 UNC thread for positive clamping with standard nuts or tapped holes
• 4140 alloy steel construction for high tensile strength and wear resistance
• 3/16 inch hex socket drive allows installation with a standard hex key in confined spaces
• Meets ASME/ANSI B18.3, ASTM F835, and IFI 124 dimensional and material standards

Compatibility

Designed as a standard shoulder screw for use in tooling, fixtures, dies, and mechanical assemblies requiring a 3/8 inch diameter shoulder with 5/16-18 UNC thread engagement.

Installation Notes

Install with a 3/16 inch hex key. Ensure the mating tapped hole or clearance bore is clean and free of debris before installation. Do not over-torque — shoulder screws are designed to clamp with the shoulder as the bearing surface, not to be driven to high preload values. In machinery applications, follow applicable ASME or facility maintenance standards for fastener installation and inspection.