Value Collection 111325PR Set Screw 5/16-18 X 1/2 in Grade 8

Product Description

The VALUE COLLECTION 111325PR is a 5/16-18 x 1/2 inch alloy steel set screw with a knurled cup point, designed for secure and vibration-resistant fastening in mechanical assemblies. Driven by a 5/32 inch hex key, this headless fastener seats flush within a tapped bore and uses its knurled cup point to bite into a mating shaft or surface, resisting rotation and axial movement. Manufactured to Grade 8 alloy steel, it meets ASME/ANSI B18.3 and ASTM F912 standards. Licensed machinists, maintenance technicians, and industrial mechanics use this fastener where a protruding head is not acceptable and holding strength is critical.

This set screw is suited for use in shaft collars, pulleys, gears, knobs, and similar mechanical components found in light industrial machinery, HVAC equipment drives, and general fabrication applications. The knurled cup point is preferred in applications requiring a strong grip on hardened or semi-hardened shafts without a dedicated flat or dimple. The UNC thread standard ensures compatibility with standard inch-series tapped holes commonly found in North American manufactured components.

Key Features

• Knurled cup point bites into shaft surface for superior rotational and axial holding power
• Grade 8 alloy steel construction provides high tensile and torsional strength
• 5/32 inch hex drive allows use with standard hex keys and ball-end drivers
• Headless design sits flush or below the surface of the tapped component
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and performance standards
• UNC 5/16-18 thread for compatibility with standard inch-series tapped holes

Compatibility

Designed as a standard inch-series UNC set screw for use in any 5/16-18 tapped hole requiring a knurled cup point headless fastener per ASME/ANSI B18.3.

Installation Notes

Installation is performed by machinists or maintenance mechanics using a 5/32 inch hex key or Allen driver. Ensure the mating tapped hole is clean and free of debris before threading the fastener. De-energize and lock out any rotating or powered equipment before installing or adjusting set screws on shafts or drive components. Do not exceed the rated torque range for the fastener size and grade; overtightening can strip threads or fracture the fastener.