Value Collection 221073PR Shoulder Screw 3/8 in Grade 8

Product Description

The VALUE COLLECTION 221073PR is a Grade 8 alloy steel shoulder screw designed for precision fastening applications that require a tight-tolerance cylindrical shoulder to locate, guide, or pivot a mating component. The shoulder measures 0.375 inches in diameter and 2 inches in length, providing a smooth bearing surface for bushings, linkages, or sliding parts. The threaded section is 5/16-18 UNC and is driven with a 3/16-inch hex socket key. The screw is left uncoated and meets ANSI B18.3 and ASTM A574 standards, making it a reliable choice for mechanical assemblies in industrial and manufacturing environments.

Shoulder screws of this type are used by maintenance technicians, machinists, and mechanical assemblers across a wide range of applications, including jigs and fixtures, die sets, cam followers, and pivot points in conveyor and linkage systems. The 2-inch shoulder length suits moderate-depth applications where precise shank engagement is needed. The hex socket drive allows installation in recessed or tight locations where a standard wrench cannot reach.

Key Features

• 0.375-inch shoulder diameter for precision fit in standard bushings and bores
• 2-inch shoulder length provides adequate bearing surface for pivot and guide applications
• 5/16-18 UNC thread for positive clamping engagement
• 3/16-inch hex socket drive for installation in confined spaces
• Grade 8 alloy steel construction for high tensile strength and wear resistance
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as an OEM-style replacement or standard-fit fastener for mechanical assemblies requiring a 3/8-inch diameter shoulder screw with a 5/16-18 UNC thread and 2-inch shoulder length.

Installation Notes

Installation is typically performed by machinists or mechanical assemblers using a 3/16-inch hex key or socket driver. Ensure the mating bore diameter matches the shoulder tolerance before installation to avoid binding or misalignment. De-energize and lock out all machinery before servicing any assembly containing shoulder screws. Do not use an impact driver, as this may damage the hex socket recess or over-torque the threaded section.