Value Collection 221100PR Shoulder Screw 1/2 in Alloy Steel

Product Description

The VALUE COLLECTION 221100PR is an alloy steel shoulder screw designed for precision fastening applications that require a controlled-diameter bearing surface. The shoulder measures 0.5 inches in diameter and 0.5 inches in length, providing an accurate pivot or spacer interface between mated components. The threaded portion is 3/8-16 UNC, and the fastener is driven with a 1/4 inch hex socket. Manufactured to Grade 8 alloy steel with an uncoated finish, this screw meets ANSI B18.3 and ASTM A574 standards. Mechanical technicians, machinists, and maintenance professionals install this type of fastener wherever a close-tolerance cylindrical shank is required to guide, pivot, or locate moving parts.

This shoulder screw is suited for use in jigs, fixtures, linkages, and machine assemblies where the shoulder acts as a precision bearing surface or pivot pin. The 3/8-16 UNC thread engages a tapped hole to clamp the assembly while the shoulder floats freely through a clearance bore in the mating part. Typical applications include industrial machinery, conveyor systems, tooling fixtures, and mechanical linkages in both light and heavy manufacturing environments. This fastener ships in single-unit packaging with a minimum order quantity of 10 pieces.

Key Features

• 0.5 inch shoulder diameter provides a precise bearing and pivot surface
• 0.5 inch shoulder length suited for thin-stack or short-travel linkage assemblies
• Grade 8 alloy steel construction for high tensile strength and shear resistance
• 3/8-16 UNC thread standard for broad compatibility with tapped steel components
• 1/4 inch hex socket drive for use with standard Allen keys and hex bit drivers
• Uncoated finish; meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as an OEM-style replacement or standard-stock shoulder screw for industrial machinery, tooling fixtures, and mechanical assemblies requiring a 1/2 inch diameter shoulder with a 3/8-16 UNC threaded end.

Installation Notes

Installation is performed by machinists or mechanical technicians using a 1/4 inch hex key or socket bit driver. Ensure the mating clearance bore matches the shoulder diameter closely to achieve the intended bearing or pivot fit before driving the threaded end into the tapped hole. Do not overtighten; the shoulder, not the thread, is the functional surface. Torque to the values specified in your assembly drawing or applicable fastener standard.