Value Collection 111257PR Set Screw 1/4-20 X 3/4 in Grade 8

Product Description

The VALUE COLLECTION 111257PR is a 1/4-20 x 3/4 inch alloy steel set screw with a knurled cup point, designed for secure, vibration-resistant fastening in mechanical assemblies. This Grade 8 fastener features a 1/8 inch hex drive socket and is manufactured to ASME/ANSI B18.3 and ASTM F912 standards, ensuring dimensional accuracy and consistent performance. The knurled cup point bites into the mating surface to resist loosening under load or vibration. Machinists, millwrights, and maintenance technicians install these screws in shaft-to-hub connections, set collars, and similar mechanical applications where a headless, flush-mount fastener is required.

This set screw is suited for general industrial and mechanical maintenance applications where a 1/4-20 UNC threaded fastener is specified. Typical installations include securing pulleys, gears, couplings, and shaft collars in light to medium-duty machinery. The knurled cup point provides positive grip against the mating shaft surface without the need for adhesives or locking inserts. Sold individually per package, with a minimum order quantity of 100 pieces, making it appropriate for production use or bench-stock replenishment.

Key Features

• 1/4-20 UNC thread with 3/4 inch overall length for versatile fitment in standard tapped holes
• Knurled cup point grips mating shaft surfaces and resists loosening from vibration
• Grade 8 alloy steel construction for high tensile and torsional strength
• 1/8 inch hex socket drive compatible with standard hex keys and Allen wrenches
• Meets ASME/ANSI B18.3 and ASTM F912 fastener standards for dimensional and mechanical conformance
• Headless design allows flush or sub-flush installation in collars, hubs, and housings

Compatibility

Designed as a direct-replacement or stock set screw for any mechanical assembly specifying a 1/4-20 UNC x 3/4 inch knurled cup point set screw to ASME/ANSI B18.3 or ASTM F912 standards.

Installation Notes

Install using a 1/8 inch hex key; ensure the driven surface and tapped hole are clean and free of debris before installation. Torque to the assembly specification for Grade 8 fasteners of this thread size as called out by the equipment manufacturer or applicable engineering standard. Always secure rotating machinery and de-energize equipment before accessing shaft and hub connections. Avoid over-torquing, which can cause thread stripping or deformation of the cup point.