Value Collection 40528 Set Screw 1/4-28 X 1/2 in Grade 8 50pk

Product Description

The VALUE COLLECTION 40528 is a 1/4-28 x 1/2-inch knurled cup point set screw manufactured from Grade 8 alloy steel. Set screws are headless fasteners used to secure a component — such as a collar, gear, or pulley — against a shaft, preventing rotation or axial movement. The knurled cup point bites into the mating surface for a firm, vibration-resistant grip. Driven with a 1/8-inch hex key, this screw meets ASME/ANSI B18.3 and ASTM F912 standards. Each package contains 50 pieces, making it practical for shop stock or service truck inventory. Applicable across HVAC, plumbing, and mechanical trades wherever shaft-locking fasteners are required.

This set screw is suited for light-to-medium duty applications in residential and commercial mechanical systems. Common uses include securing fan hubs, motor shaft collars, coupling assemblies, and valve stems. The UNF 1/4-28 thread pitch is standard in precision mechanical assemblies where fine thread engagement and holding strength are critical. Tradespeople in HVAC, refrigeration, plumbing, and general mechanical service will find this fastener appropriate for routine shaft-locking tasks on equipment requiring a small-diameter, high-strength set screw.

Key Features

• Knurled cup point design bites into shaft surfaces for a secure, vibration-resistant hold
• Grade 8 alloy steel construction provides high tensile and proof load strength
• 1/4-28 UNF thread for precise engagement in fine-thread applications
• 1/8-inch hex drive for standard hex key installation
• Meets ASME/ANSI B18.3 and ASTM F912 fastener standards
• Sold in a 50-piece pack for shop stock or multi-unit service use

Compatibility

Designed as a standard 1/4-28 UNF set screw suitable for use in any mechanical assembly calling for a knurled cup point, Grade 8 alloy steel headless fastener of 1/2-inch overall length.

Installation Notes

Set screws of this type are installed by licensed HVAC technicians, plumbers, and mechanical trades using a 1/8-inch hex key or Allen driver. Always de-energize and lock out equipment before disassembling shaft assemblies. Tighten to the torque specification called out in the equipment manufacturer documentation — do not rely on feel alone for Grade 8 fasteners. Inspect threads for damage before installation; cross-threading a set screw in a precision tapped bore may require bore repair or replacement of the mating component.