Value Collection R63266642 Set Screw 1/4-28 X 5/16 in Cup Point

Product Description

The VALUE COLLECTION R63266642 is a 1/4-28 UNF cup point set screw manufactured from 18-8 stainless steel. This fully threaded fastener seats against a shaft or component surface using a recessed cup tip that bites into the mating material to resist rotation and axial movement. Drive engagement is through a 1/8-inch hex key socket. At 5/16 inches in overall length, it is suited for compact assemblies where a low-profile, headless fastener is required. Licensed machinists, maintenance technicians, and fabricators working with stainless assemblies in corrosion-prone or sanitary environments commonly specify this grade.

This set screw is used in light-to-medium duty shaft-collar, pulley, gear, and coupling applications where the fastener must remain flush with or below the surface of the component. The 1/4-28 unified fine thread provides tight thread engagement in thinner-walled hubs and collars. The cup point geometry is appropriate where a moderate bite into the shaft surface is acceptable and light marring of the shaft is not a concern. Applications span HVAC blower assemblies, plumbing fixture hardware, electrical enclosure hardware, and general industrial fabrication.

Key Features

• Cup point tip provides positive grip against shaft surface to resist rotation and axial movement
• 18-8 stainless steel construction offers corrosion resistance in wet, humid, or mildly chemical environments
• 1/4-28 UNF thread standard for fine-pitch engagement in thin-walled hubs and collars
• 1/8-inch hex key drive allows installation in recessed or blind bores
• Headless design sits flush with or below the mating surface for clearance-sensitive assemblies
• 5/16-inch overall length suits compact collar and coupling configurations

Compatibility

Designed as a direct-fit replacement or standard-stock set screw for any assembly specifying a 1/4-28 UNF cup point set screw with 5/16-inch overall length and 1/8-inch hex drive in 18-8 stainless steel.

Installation Notes

Installation is performed with a 1/8-inch hex key or Allen driver. Ensure the shaft and collar bore are clean and free of debris before driving the screw to prevent cross-threading the fine-pitch thread. De-energize or lock out any rotating equipment before servicing shaft collars, pulleys, or couplings that use this fastener. Avoid over-torquing, as 18-8 stainless fasteners are susceptible to galling; use an anti-seize compound rated for stainless steel if repeated removal is anticipated.