Value Collection 221145PR Shoulder Screw 1/2 in X 4 in Alloy Steel

Product Description

The VALUE COLLECTION 221145PR is an alloy steel shoulder screw designed for precision fastening applications where a controlled-diameter bearing surface is required. The 0.5 inch shoulder diameter and 4 inch shoulder length provide a smooth, accurate pivot or guide surface for bushings, rollers, linkages, and similar components. The fastener drives with a 1/4 inch hex socket and threads into a 3/8-16 UNC tapped hole. Material grade 8 alloy steel delivers the tensile strength needed for demanding mechanical assemblies. The uncoated finish is standard for this class of precision fastener. Machinists, millwrights, and mechanical assemblers are the typical installers for this type of hardware.

This shoulder screw fits applications across industrial machinery, jigs and fixtures, tooling, and mechanical linkage assemblies where a close-tolerance shaft or pivot point is needed. The 4 inch shoulder length accommodates deeper stack assemblies such as multi-plate linkages or guide-bushing arrangements. It is sold individually with a minimum order quantity of 10 pieces, making it suited for production maintenance and repair inventory.

Key Features

• 0.5 inch shoulder diameter provides a precise bearing surface for bushings and rollers
• 4 inch shoulder length supports deep-stack and multi-component assemblies
• Grade 8 alloy steel construction for high tensile strength in demanding applications
• 3/8-16 UNC thread standard ensures wide tap compatibility
• 1/4 inch hex socket drive for standard Allen key or bit driver installation
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as a standard shoulder screw for use in any application requiring a 0.5 inch shoulder diameter, 4 inch shoulder length, and 3/8-16 UNC threaded engagement in grade 8 alloy steel.

Installation Notes

Installation is performed with a 1/4 inch hex key or socket bit driver. Ensure the mating tapped hole is clean and meets 3/8-16 UNC thread specification before installation. Do not use an impact driver, as over-torquing can damage the precision shoulder surface or thread engagement. Follow applicable machine design and safety standards for the host equipment when specifying fastener torque values.