Value Collection 221252BR Shoulder Screw 3/4 in Alloy Steel

Product Description

The VALUE COLLECTION 221252BR is an alloy steel shoulder screw designed for precision fastening applications where a hardened, close-tolerance shoulder is required. The shoulder measures 0.750 inches in diameter and 4-3/4 inches in length, providing a smooth bearing surface for rotating or sliding components such as linkages, pivots, and guide assemblies. The 5/8-11 UNC threaded section secures the fastener in the mating part, while the hex socket drive accepts a 3/8-inch drive key for installation. Built to Material Grade 8 and manufactured to ANSI B18.3 and ASTM A574 standards, this screw is suited for high-strength mechanical assemblies in industrial and commercial maintenance environments.

This shoulder screw is used in general industrial and mechanical assembly applications where a precise shoulder diameter is needed to locate, pivot, or guide a mating component. Typical installations include jigs, fixtures, conveyor linkages, tooling assemblies, and machine frames. It is installed by machinists, millwrights, and maintenance technicians working on production equipment, fabrication tooling, or structural mechanical assemblies. The uncoated finish makes it suitable for applications where secondary coating or treatment will be applied, or where bare alloy steel is acceptable for the service environment.

Key Features

• 0.750-inch shoulder diameter provides a close-tolerance bearing surface for rotating and sliding components
• 4-3/4-inch shoulder length accommodates deep pivot or guide applications
• 5/8-11 UNC thread for positive engagement in standard tapped holes
• Material Grade 8 alloy steel construction for high tensile strength and hardness
• Hex socket drive (3/8-inch drive size) for torque application with a standard hex key or socket wrench
• Meets ANSI B18.3, ASME/ANSI B18.3, and ASTM A574 dimensional and strength standards

Compatibility

Designed as a standard-dimension replacement or new-installation shoulder screw for industrial machinery, tooling fixtures, and mechanical assemblies requiring a 3/4-inch shoulder diameter and 5/8-11 UNC thread per ANSI B18.3 specifications.

Installation Notes

Installation is performed by machinists or maintenance technicians using a 3/8-inch hex key or socket driver. Ensure the mating tapped hole is clean, properly sized to 5/8-11 UNC, and free of debris before threading the screw. De-energize and lock out any equipment before servicing mechanical assemblies containing shoulder screws. Do not use impact drivers on hex socket shoulder screws, as this can damage the socket recess or exceed shoulder tolerance requirements.