Value Collection 221184BR Shoulder Screw 5/8 in Alloy Steel

Product Description

The VALUE COLLECTION 221184BR is a Grade 8 alloy steel shoulder screw designed for precision mechanical assemblies requiring a hardened, close-tolerance shoulder. The screw features a 0.625-inch shoulder diameter and a 3-1/4-inch shoulder length, providing a reliable pivot or bearing surface in jigs, fixtures, linkages, and machinery components. The 1/2-13 UNC threaded section locks securely into a tapped hole, while the 7/8-inch diameter hex socket head accepts a 5/16-inch hex key for installation in tight clearances. This fastener is installed by machinists, maintenance technicians, and mechanical assemblers working across industrial and OEM applications.

This shoulder screw is suited for applications where a smooth, hardened shaft surface must pass through a bushing, bearing, or pivot point. Common use cases include tooling fixtures, cam mechanisms, conveyor linkages, and precision machine frames. The uncoated finish makes it appropriate for environments where secondary coating or plating will be applied, or where bare steel is acceptable for the service condition. It ships individually and is ordered in single-unit quantities, making it practical for maintenance and repair as well as production line use.

Key Features

• Grade 8 alloy steel construction for high tensile strength and hardness
• 0.625-inch shoulder diameter with 3-1/4-inch shoulder length for extended pivot or guide surface
• 1/2-13 UNC thread for secure engagement in standard tapped holes
• 7/8-inch head diameter with 5/16-inch hex socket drive for installation in confined spaces
• 3/8-inch head height for low-profile seating
• 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 5/8-inch shoulder diameter, 3-1/4-inch shoulder length, and 1/2-13 UNC threaded engagement in alloy steel construction.

Installation Notes

Installation requires a 5/16-inch hex key or Allen driver. Ensure the mating tapped hole is clean and correctly sized for 1/2-13 UNC thread engagement before installation. Do not overtighten beyond the torque capacity appropriate for Grade 8 alloy steel fasteners of this thread size, and consult applicable engineering or maintenance specifications for the assembly. Always de-energize or lock out any machinery before replacing or servicing fasteners in moving assemblies.