Value Collection 40526 Set Screw 1/4-28 X 5/16 in Grade 8 50pk

Product Description

The VALUE COLLECTION 40526 is a 1/4-28 UNF alloy steel set screw with a knurled cup point, offered in a pack of 50. Set screws are headless fasteners used to secure a component — such as a collar, gear, or pulley — against or onto a shaft by applying direct force through the point. This screw measures 5/16 inches in overall length and is driven with a 1/8-inch hex key. Built to Grade 8 alloy steel, it delivers high tensile strength suitable for demanding mechanical assemblies. Machinists, millwrights, and maintenance technicians are the typical installers of this fastener type.

This set screw is appropriate for use in light-to-heavy mechanical assemblies where shaft retention or positioning is required. The knurled cup point bites into the mating surface to resist rotation and axial movement without requiring a nut or bolt head. Applications include motor shafts, conveyor components, HVAC blower wheel hubs, and general industrial assemblies. The fine UNF thread pitch (1/4-28) provides precise thread engagement and greater resistance to loosening under vibration compared to coarse thread equivalents.

Key Features

• Knurled cup point for increased grip and surface bite on mating shaft material
• 1/4-28 UNF fine thread for precise engagement and vibration resistance
• Grade 8 alloy steel construction for high tensile and torsional strength
• 1/8-inch hex drive — compatible with standard hex keys and Allen wrenches
• Meets ASME/ANSI B18.3 and ASTM F912 fastener standards
• Pack of 50 for job-site or shop stock replenishment

Compatibility

Designed as a standard 1/4-28 UNF headless set screw suitable for use in any mechanical assembly requiring a knurled cup point fastener conforming to ASME/ANSI B18.3 and ASTM F912 specifications.

Installation Notes

Installation is performed by machinists, millwrights, or qualified maintenance technicians using a 1/8-inch hex key or Allen wrench. De-energize and lock out all rotating equipment before installing or adjusting set screws. Do not exceed the torsional limits of the hex socket — use a properly sized hex key to avoid rounding the drive. Verify thread engagement depth is sufficient for the clamping load of the application before returning equipment to service.