Value Collection 101393PR Set Screw 5/16-18 X 7/8 in Cup Point

Product Description

The VALUE COLLECTION 101393PR is a cup point set screw designed for secure fastening applications where a headless, flush-mount fastener is required. Threaded 5/16-18 UNC with an overall length of 7/8 inches, this screw is driven by a 5/32-inch hex key. It is manufactured from Grade 8 alloy steel, providing high tensile strength suitable for demanding mechanical assemblies. The cup point digs into the mating surface to resist rotational and axial movement, making it a reliable choice for locking collars, hubs, pulleys, and shafts in place. HVAC, plumbing, and mechanical trades encounter this fastener type in equipment assemblies and bracket hardware.

This set screw is suited for use in both residential and light commercial mechanical installations. It is commonly used to secure rotating components to shafts, lock adjustment collars, and fasten components where a protruding head is not acceptable. The 5/16-18 UNC thread is a widely used coarse-thread standard, making this screw compatible with a broad range of threaded housings and tapped holes in steel or aluminum assemblies. Technicians installing or servicing motors, blowers, pumps, and similar rotating equipment regularly work with this fastener size.

Key Features

• Cup point design bites into mating surface for strong resistance to rotation and axial shifting
• 5/16-18 UNC coarse thread for broad compatibility with standard tapped holes
• Grade 8 alloy steel construction for high tensile and torsional strength
• 5/32-inch hex drive accepts standard hex keys and L-wrenches
• Conforms to ASME/ANSI B18.3 and ASTM F912 standards
• Headless design allows flush or recessed installation

Compatibility

Designed as a standard replacement or stock set screw for any application requiring a 5/16-18 UNC cup point fastener driven by a 5/32-inch hex key in alloy steel Grade 8.

Installation Notes

Installation is performed with a 5/32-inch hex key or L-wrench; ensure the key is fully seated before applying torque to avoid rounding the drive socket. Power down and de-energize any equipment before accessing rotating assemblies or tightening set screws on motor shafts or pulleys. Do not exceed the rated torque range for the fastener grade, and inspect the mating shaft surface for damage before installation. Follow applicable mechanical and equipment manufacturer guidelines when securing drive components.