Value Collection 111331PR Set Screw 5/16-18 X 7/8 in Grade 8

Product Description

The VALUE COLLECTION 111331PR is a 5/16-18 x 7/8-inch knurled cup point set screw manufactured from Grade 8 alloy steel. Set screws are fully threaded fasteners with no head, designed to secure a component — such as a collar, gear, or pulley — against or onto a shaft by applying direct clamping force through their point. The knurled cup point bites into the mating surface for a positive, slip-resistant grip. Drive is a 5/32-inch hex (Allen) socket. This screw is built to ASME/ANSI B18.3 and ASTM F912 standards, making it suitable for high-load, vibration-prone assemblies in mechanical and industrial applications.

This set screw is used wherever a flush or recessed fastener is required to lock rotating or sliding components in place on a shaft. Typical applications include motor shaft collars, sprocket hubs, coupling assemblies, and valve stems in HVAC equipment, industrial machinery, and general mechanical installations. The UNC thread form and Grade 8 alloy steel construction make it appropriate for high-torque, heavy-duty service where standard steel fasteners would be insufficient. Installation requires a 5/32-inch hex key.

Key Features

• Knurled cup point provides positive grip and resists loosening under vibration
• Grade 8 alloy steel for high tensile strength in demanding mechanical applications
• 5/16-18 UNC thread for compatibility with standard unified coarse thread assemblies
• 5/32-inch hex drive accepts standard Allen or hex key tools
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and material standards
• Headless design allows flush or sub-flush installation in threaded bores

Compatibility

Designed as a standard UNC set screw for use in any threaded bore sized for 5/16-18 thread, including shaft collars, hubs, couplings, and similar mechanical components requiring a knurled cup point fastener.

Installation Notes

Set screws are installed and removed by a qualified mechanic or technician using a 5/32-inch hex key. De-energize and lock out all equipment before servicing any assembly that contains this fastener. Do not exceed the rated torque range for Grade 8 fasteners of this thread size as published in applicable mechanical standards. Ensure the threaded bore is clean and free of debris before installation to avoid cross-threading.