Value Collection R40344428 Set Screw 4-40 X 1/4 in Cup Point

Product Description

The VALUE COLLECTION R40344428 is a 4-40 UNC stainless steel set screw with a cup point and hex drive, designed for secure fastening applications where the fastener must sit flush or below the surface of the workpiece. At 1/4 inch overall length, this screw is suited for light-duty clamping and positioning tasks in mechanical assemblies. It is manufactured from Grade 18-8 stainless steel, offering corrosion resistance suitable for general industrial, HVAC, and mechanical environments. The hex drive requires a 0.050-inch hex key for installation. This type of fastener is typically installed by machinists, millwrights, HVAC technicians, and other trade professionals working with set-screw collars, shaft collars, pulleys, or adjustment mechanisms.

This set screw is used in residential and light commercial mechanical assemblies where a compact, corrosion-resistant fastener is needed to lock rotating or sliding components onto a shaft or within a housing. Common applications include motor shaft collars, fan hubs, adjustment knobs, and similar hardware found in HVAC equipment, plumbing fixtures, and general mechanical assemblies. The cup point bites into the mating surface to provide positive locking under vibration and load. This item is sold individually but carries a minimum order quantity of 100 pieces.

Key Features

• Thread size 4-40 UNC for compatibility with standard 4-40 tapped holes
• Cup point design provides positive bite into the mating shaft or surface for secure locking
• Grade 18-8 stainless steel construction resists corrosion in humid and wet service environments
• Hex drive requires a 0.050-inch hex key — standard hex wrench set covers this size
• 1/4 inch overall length suits shallow-bore and thin-collar applications

Compatibility

Designed as a standard 4-40 UNC replacement or service set screw for mechanical assemblies using 4-40 tapped set-screw positions with cup-point and hex-drive requirements.

Installation Notes

Installation is performed using a 0.050-inch hex key; ensure the key is fully seated before applying torque to avoid rounding the drive socket. Before servicing any assembly, de-energize all electrical power and relieve any mechanical load or tension on the shaft being secured. Do not overtighten small-diameter set screws, as thread stripping is common in fine-thread fasteners of this size. Refer to equipment manufacturer documentation for any assembly-specific fastening procedures.