Value Collection 221153PR Shoulder Screw 1/2 in Alloy Steel

Product Description

The VALUE COLLECTION 221153PR is a Grade 8 alloy steel shoulder screw designed for precision fastening applications that require an accurately machined unthreaded shoulder to serve as a bearing surface, pivot point, or alignment feature. The shoulder measures 0.5 inches in diameter and 4-3/4 inches in length, providing a generous bearing surface for linkage, jig, and fixture work. The fastener drives with a 1/4-inch hex socket and threads at 3/8-16 UNC. The uncoated finish means the base alloy steel is bare, suitable for use where additional coating or plating will be applied by the end user or where clean metal contact is required.

Shoulder screws of this specification are commonly used in industrial machinery, tooling fixtures, die sets, robotic linkages, and general mechanical assemblies wherever a precise pivot or guided-slide interface is needed. The long 4-3/4-inch shoulder length makes this screw well suited to thick-plate assemblies or applications requiring extended bearing engagement. Machinists, tool-and-die makers, millwrights, and maintenance technicians in manufacturing environments are the typical installers. Sold individually with a minimum order quantity of 5 pieces.

Key Features

• Grade 8 alloy steel construction for high tensile strength and wear resistance
• Precisely machined 0.5-inch diameter shoulder provides accurate bearing and pivot surface
• 4-3/4-inch shoulder length accommodates thick-plate and extended-engagement assemblies
• 3/8-16 UNC thread standard ensures broad hardware compatibility
• 1/4-inch hex socket drive for positive torque engagement
• Uncoated finish for use in plating lines or clean metal-to-metal contact applications
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as a standard shoulder screw conforming to ANSI B18.3 and ASME/ANSI B18.3 specifications, fitting any application that calls for a 1/2-inch shoulder diameter, 4-3/4-inch shoulder length, 3/8-16 UNC threaded shoulder screw with a hex socket drive.

Installation Notes

Installation requires a 1/4-inch hex key or socket bit driver rated for the torque demands of Grade 8 hardware. Ensure the mating bore is machined to the correct tolerance for a 0.5-inch shoulder diameter before installation to achieve proper fit and bearing function. Do not use an impact driver at full power, as over-torquing the 3/8-16 thread can damage the threaded bore in softer mating materials. De-energize and lock out any machinery before servicing assemblies that incorporate shoulder screws as pivot or linkage components.