Value Collection 111247PR Set Screw 1/4-20 X 5/16 in Grade 8

Product Description

The VALUE COLLECTION 111247PR is a 1/4-20 UNC set screw with a knurled cup point, manufactured from Grade 8 alloy steel. Set screws are headless fasteners used to secure a component — such as a collar, pulley, gear, or sprocket — against a shaft by applying clamping force directly through the point. The knurled cup point bites into the mating surface to resist rotation and axial movement. At 5/16 inches overall length with a 1/8-inch hex drive, this fastener is sized for compact assemblies where a standard cap screw cannot be used. It meets ASME/ANSI B18.3 and ASTM F912 standards. Installation requires a 1/8-inch hex key.

This set screw is suited for mechanical assemblies across industrial, HVAC, and equipment-maintenance applications. Typical uses include securing shaft collars on fan and blower assemblies, locking pulleys on motor shafts, and fixing couplings in pump or drive systems. The Grade 8 alloy steel construction is appropriate for moderate-to-high torque applications where a softer set screw would deform or back out under vibration or load. This fastener uses fractional inch measurement and UNC thread form, common in North American equipment manufacturing and repair.

Key Features

• Knurled cup point grips mating shaft surface to resist rotation and axial movement
• Grade 8 alloy steel for high-strength performance under torque and vibration
• 1/4-20 UNC thread for compatibility with standard fractional inch tapped holes
• 1/8-inch hex drive accepts a standard hex key or Allen driver
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and mechanical standards
• Headless design allows flush or recessed installation in tapped through-holes or blind holes

Compatibility

Designed for use in any tapped 1/4-20 UNC blind hole or through-hole requiring a headless set screw with a knurled cup point. Suitable as a direct replacement in mechanical assemblies that specify an ASME/ANSI B18.3 or ASTM F912 compliant socket set screw at this thread size and length.

Installation Notes

Install with a 1/8-inch hex key; ensure the key is fully seated before applying torque to avoid rounding the drive. De-energize and lock out any equipment before servicing shaft-mounted components secured by set screws. Do not reuse a set screw that shows deformation at the point or drive socket. Apply thread-locking compound per the equipment manufacturer's specification when vibration resistance is required.