Value Collection 221127PR Shoulder Screw 1/2 in Grade 8 Alloy Steel

Product Description

The VALUE COLLECTION 221127PR is a Grade 8 alloy steel shoulder screw designed for precision fastening applications where a fixed pivot point, bearing surface, or spacer is required. The uncoated shoulder measures 0.5 inches in diameter and 2.5 inches in length, providing an accurate bearing surface for bushings, linkages, and moving assemblies. Drive engagement is via a 1/4 inch hex socket. This fastener meets ANSI B18.3 and ASTM A574 standards and is typically installed by maintenance technicians, millwrights, and mechanical assemblers working on industrial or commercial machinery.

Shoulder screws of this type are used in jigs, fixtures, die sets, robotic assemblies, and general industrial machinery wherever a hardened, close-tolerance pivot or guide post is needed. The 3/8-16 UNC threaded shank engages standard tapped holes in steel plates and housings. The uncoated finish makes this screw suitable for environments where secondary coatings or lubrication will be applied by the installer. Each unit is sold individually with a minimum order quantity of 5 pieces.

Key Features

• 0.5 inch shoulder diameter provides a precise bearing surface for bushings and linkages
• 2.5 inch shoulder length accommodates thicker plates and deep pivot applications
• Grade 8 alloy steel construction for high tensile strength and shear resistance
• 3/8-16 UNC thread engages standard tapped holes
• 1/4 inch hex socket drive for torque application with standard Allen keys or hex bits
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as a standard shoulder screw replacement or new installation fastener for jigs, fixtures, die sets, and industrial machinery using 3/8-16 UNC tapped holes and requiring a 0.5 inch diameter shoulder bearing surface.

Installation Notes

Installation is performed by maintenance technicians or mechanical assemblers using a 1/4 inch hex key or socket driver. Ensure the mating tapped hole is clean and properly sized to 3/8-16 UNC before installation. Power down and de-energize any machinery before servicing fasteners in moving assemblies. Do not use an impact driver on hex socket shoulder screws, as overtorquing can damage the shoulder fit or strip the socket.