Value Collection 221121PR Shoulder Screw 1/2in X 2in 3/8-16 Alloy

Product Description

The VALUE COLLECTION 221121PR is a Grade 8 alloy steel shoulder screw designed for precision fastening applications where a controlled-diameter bearing surface is required. The shoulder measures 0.5 inches in diameter and 2 inches in length, providing an accurate pivot or bearing point for components such as linkages, cams, and fixtures. The 3/8-16 UNC threaded section anchors the fastener securely into a tapped hole. Drive engagement is through a 1/4 inch hex socket. The uncoated finish leaves the alloy steel surface bare, which is standard for applications where dimensional accuracy is the priority. Installed by machinists, maintenance technicians, and assembly professionals.

This shoulder screw is suited for industrial, mechanical, and manufacturing applications where a hardened, close-tolerance shoulder is needed to serve as a shaft, pivot, or guide pin. Typical install scenarios include jigs, fixtures, tooling, and machine assemblies where components must rotate or slide on the shoulder rather than on a threaded surface. The Grade 8 alloy steel construction supports high-load environments. Sold individually with a minimum order quantity of 5 units.

Key Features

• Shoulder diameter of 0.5 inches provides a precise bearing and pivot surface
• 2 inch shoulder length accommodates standard fixture and linkage stack-ups
• 3/8-16 UNC thread for secure engagement in tapped steel or aluminum
• Grade 8 alloy steel construction for high tensile strength and durability
• 1/4 inch hex socket drive for Allen key or hex bit installation
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 standards

Compatibility

Designed as a standard shoulder screw per ANSI B18.3 and ASME/ANSI B18.3, suitable for use in any application requiring a 1/2 inch diameter, 2 inch long shoulder with a 3/8-16 UNC threaded end in alloy steel.

Installation Notes

Installation requires a 1/4 inch hex key or hex socket bit. Ensure the tapped receiving hole meets the 3/8-16 UNC thread specification and that the counterbored shoulder hole is sized to the appropriate close-tolerance fit for the 0.5 inch shoulder diameter. De-energize or lock out any machinery before installing or replacing shoulder screws in active assemblies. Do not use an impact driver at full torque, as this can damage the hex socket recess on hardened fasteners.