Value Collection 101341P Set Screw 1/4-28 X 3/8 in Cup Point

Product Description

The VALUE COLLECTION 101341P is a 1/4-28 cup point set screw manufactured from Grade 8 alloy steel. Set screws are headless fasteners used to secure a component — such as a collar, pulley, or gear — onto a shaft by applying direct pressure at the point of contact. The cup point design bites into the mating surface to resist rotation and axial movement. Driven with a 1/8-inch hex key, this fastener meets ASME/ANSI B18.3 and ASTM F912 standards. It is appropriate for mechanical assemblies requiring reliable holding force in a compact, flush-mount form factor. Sold individually; minimum order quantity is 100 pieces.

This set screw is suited for light industrial, mechanical maintenance, and OEM assembly applications where a flush or below-surface fastener is required. The 1/4-28 thread is a fine-pitch unified thread (UNF), offering higher thread engagement and resistance to loosening compared to coarse-pitch alternatives. Typical applications include shaft collars, set-screw hubs, couplings, and similar mechanical drive components across HVAC equipment, pumps, and general machinery.

Key Features

• Cup point geometry bites into shaft surface to resist axial and rotational movement
• Grade 8 alloy steel construction provides high tensile strength and durability
• 1/4-28 fine-pitch UNF thread for improved holding force and vibration resistance
• 1/8-inch internal hex drive for use with standard hex keys or Allen wrenches
• Meets ASME/ANSI B18.3 and ASTM F912 fastener standards
• Headless design sits flush or below surface for clearance-sensitive assemblies

Compatibility

Designed for use in any mechanical assembly requiring a 1/4-28 threaded set screw with a cup point. Verify thread size, length, and point type against the existing hardware specification before installation.

Installation Notes

Installation is typically performed by a machinist, millwright, or mechanical technician using a 1/8-inch hex key. De-energize and lock out any rotating equipment before servicing components secured by set screws. Apply appropriate thread-locking compound if vibration is a concern, and torque to the value specified by the equipment manufacturer or applicable engineering specification — do not over-tighten, as cup point set screws can deform the mating shaft surface. Inspect the seating surface for burrs or contamination before installation.