Value Collection 221088PR Shoulder Screw 3/8 in Alloy Steel

Product Description

The VALUE COLLECTION 221088PR is an alloy steel shoulder screw designed for precision fastening applications requiring a controlled-diameter bearing surface. The shoulder measures 0.375 inches in diameter and 3-1/4 inches in length, providing a smooth, accurate shank for use as a pivot point, guide pin, or spacer. The threaded portion is 5/16-18 UNC, and drive engagement is via a 3/16-inch hex socket. Manufactured to ANSI B18.3 and ASTM A574 standards, this screw is suited for mechanical assemblies, jigs, fixtures, and tooling applications. It ships uncoated and is intended for professional assembly and maintenance technicians.

This shoulder screw is commonly used in industrial machinery, automation equipment, jigs, fixtures, and precision mechanical assemblies where a ground-diameter shoulder is needed to locate, guide, or pivot a component. The uncoated alloy steel construction suits dry or lightly lubricated environments. Machinists, tool and die makers, and mechanical maintenance personnel are the typical installers. The UNSPSC code for this product is 31161619.

Key Features

• Shoulder diameter of 0.375 inches provides a precise bearing and locating surface
• Shoulder length of 3-1/4 inches suits deep-reach pivot and guide-pin applications
• 5/16-18 UNC threaded end for standard tapped-hole engagement
• 3/16-inch hex socket drive for torque application in confined spaces
• Grade 8 alloy steel construction meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards
• Uncoated finish — compatible with secondary plating, coating, or use as-is

Compatibility

Designed as a standard shoulder screw for use in any application requiring a 3/8-inch shoulder diameter, 3-1/4-inch shoulder length, and 5/16-18 UNC threaded engagement in alloy steel.

Installation Notes

Installation is performed by machinists or mechanical technicians using a 3/16-inch hex key or Allen driver. Ensure the receiving tapped hole is clean and properly threaded to 5/16-18 UNC specification before installation. Do not overtighten — the shoulder, not the thread, provides the primary locating and bearing function. Follow applicable ASME and shop safety standards when working with precision fasteners in loaded assemblies.