Value Collection 121157PR Set Screw 5/16-18 X 1 in Grade 8

Product Description

The VALUE COLLECTION 121157PR is a Grade 8 alloy steel set screw with a cone point tip and hex socket drive. It is manufactured to ASME/ANSI B18.3 and ASTM F912 standards, making it a precision fastener intended for demanding clamping and locking applications. The 5/16-18 UNC thread and 1-inch overall length suit it for securing collars, hubs, pulleys, and similar components to shafts. Drive engagement requires a 5/32-inch hex key. This fastener is installed by millwrights, maintenance technicians, equipment assemblers, and any trade professional working with power transmission or mechanical assemblies.

This set screw is suited for industrial and commercial maintenance environments where a reliable, fully threaded locking fastener is needed. The cone point geometry concentrates clamping force at a small contact area, providing strong rotational and axial resistance on shafts. Typical applications include securing pulleys, gears, sprockets, and shaft collars in rotating equipment. The Grade 8 alloy steel construction handles high-stress service conditions where standard-grade fasteners would be insufficient.

Key Features

• Cone point tip concentrates holding force for firm shaft engagement
• Grade 8 alloy steel construction for high-strength, high-stress applications
• 5/16-18 UNC thread provides positive thread engagement in standard tapped holes
• 1-inch overall length suits a wide range of hub and collar depths
• 5/32-inch hex socket drive works with standard hex keys and L-wrenches
• Manufactured to ASME/ANSI B18.3 and ASTM F912 dimensional and material standards

Compatibility

Designed as an OEM-style and aftermarket replacement set screw for any application requiring a 5/16-18 UNC, 1-inch overall length, cone point, Grade 8 alloy steel fastener conforming to ASME/ANSI B18.3 and ASTM F912.

Installation Notes

Installation and removal require a 5/32-inch hex key or Allen wrench. Ensure the mating tapped hole is clean and free of debris before threading the screw in by hand to verify engagement. Power down and de-energize any rotating equipment before servicing fasteners on shafts, collars, or hubs. Apply thread-locking compound if vibration is a service concern, following the equipment manufacturer's torque and locking guidance.