Value Collection 111013PR Set Screw 4-40 X 1/4 in Grade 8

Product Description

The VALUE COLLECTION 111013PR is a Grade 8 alloy steel set screw designed for secure, headless fastening in mechanical assemblies. It features a knurled cup point that bites into the mating surface to resist rotation and axial movement under load. The hex drive accepts a 0.050-inch hex key for installation and removal. At 1/4 inch overall length with a 4-40 UNC thread, this fastener suits compact, precision applications where a protruding head is not acceptable. It meets ASME/ANSI B18.3 and ASTM F912 standards, confirming dimensional accuracy and material performance. This screw is sold individually with a minimum order quantity of 100 units.

This set screw is used in light-duty mechanical and electromechanical assemblies where a small-diameter, fine-pitch fastener is required. Typical applications include securing collars, hubs, pulleys, and gears to shafts in motors, HVAC components, and control mechanisms. The knurled cup point is particularly suited for locking onto soft or hardened shafts where a permanent or semi-permanent hold is needed without additional locking hardware. Technicians working on small motor assemblies, fan shaft collars, and similar components will encounter this fastener type frequently.

Key Features

• Grade 8 alloy steel construction for high clamping force and hardness
• Knurled cup point bites into mating surface to resist loosening from vibration
• 4-40 UNC thread for fine-pitch engagement in compact assemblies
• 0.050-inch hex drive for installation with a standard hex key
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and material standards
• 1/4 inch overall length suits shallow-depth fastening applications

Compatibility

Designed as a standard 4-40 UNC set screw for use in any mechanical assembly requiring a headless hex-drive fastener with a knurled cup point at this thread size and length.

Installation Notes

Installation requires a 0.050-inch hex key; confirm the key fits fully before applying torque to avoid rounding the drive socket. Power down or de-energize any equipment before accessing fasteners on rotating components such as motor shafts or fan hubs. Verify that the mating shaft material is compatible with a cup point set screw before seating, as the knurled point will mark or indent the shaft surface. Follow applicable mechanical and electrical codes when servicing equipment containing these fasteners.