Value Collection 221082PR Shoulder Screw 3/8 in Grade 8 Alloy Steel

Product Description

The VALUE COLLECTION 221082PR is a Grade 8 alloy steel shoulder screw designed for precision fastening applications requiring a smooth, hardened shoulder as a bearing, pivot, or locating surface. The shoulder measures 0.375 inches in diameter and 2-3/4 inches in length, with a 5/16-18 UNC threaded end for secure engagement. Drive interface is a 3/16-inch hex socket. The head stands 0.25 inches tall with a head diameter ranging from 0.543 to 0.562 inches. Left uncoated, this screw is ready for use in standard dry or lightly lubricated environments. Machinists, tool-and-die technicians, and maintenance professionals install this type of fastener in jigs, fixtures, dies, and mechanical assemblies.

Shoulder screws of this type are used across light and heavy industrial applications wherever a hardened, close-tolerance cylindrical surface is needed to guide motion or serve as a pivot point. Typical installations include punch-and-die sets, spring-loaded assemblies, linkages, and fixture plates. The 5/16-18 UNC thread engages standard tapped holes in steel tooling plates and machine components. This screw meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards, making it suitable for demanding mechanical and tooling applications.

Key Features

• Grade 8 alloy steel construction for high shear strength and hardness
• 0.375-inch shoulder diameter provides a precise bearing and locating surface
• 2-3/4-inch shoulder length accommodates deep fixture and die assemblies
• 5/16-18 UNC thread for engagement in standard tapped steel tooling plates
• 3/16-inch hex socket drive for easy installation with standard Allen keys or hex drivers
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as an OEM-style replacement or direct-use shoulder screw for standard 5/16-18 UNC tapped applications in jigs, fixtures, dies, and mechanical assemblies requiring a 3/8-inch shoulder diameter.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 3/16-inch hex key or socket driver. Ensure the mating tapped hole is clean and threads are in good condition before driving the screw. Do not overtighten; torque to the value specified in the applicable design or maintenance documentation. Follow all applicable ANSI and facility safety standards when working with tooling and fixturing hardware.