Value Collection 121001PR Set Screw 4-40 X 1/8 in Cone Point

Product Description

The VALUE COLLECTION 121001PR is a Grade 8 alloy steel set screw with a cone point and hex drive, conforming to ASME/ANSI B18.3 and ASTM F912 standards. With a 4-40 UNC thread size and an overall length of 0.125 inches, this fastener is engineered for precision holding and positioning applications where high clamping force and reliable bite into a mating shaft are required. The cone point geometry concentrates load at a single contact area, making it well suited for permanent or semi-permanent assemblies. Machinists, millwrights, and maintenance technicians typically install this fastener using a 0.050-inch hex key driver.

This set screw is used in light-duty mechanical assemblies across industrial, commercial, and maintenance applications. Common uses include securing collars, gears, pulleys, and knobs to shafts where flush or recessed fastener seating is needed. The 4-40 thread size targets small-diameter components and precision instruments. The cone point design provides strong holding power without requiring a drilled dimple in the shaft, though a slight indent in the shaft surface will improve retention. This fastener ships in multiples of 100 per order.

Key Features

• Grade 8 alloy steel construction for high tensile and torsional strength
• Cone point geometry concentrates clamping force for positive shaft engagement
• Hex drive (0.050-inch key size) allows installation in recessed or counterbored holes
• 4-40 UNC thread standard ensures broad compatibility with inch-series tapped components
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and performance standards
• Overall length of 0.125 inches suits thin-wall and compact assembly profiles

Compatibility

Designed as an OEM-style replacement or standard-stock fastener for any 4-40 UNC tapped set screw application requiring a cone point and hex drive per ASME/ANSI B18.3 specifications.

Installation Notes

Installation is performed using a 0.050-inch hex key; apply torque carefully to avoid stripping the small drive recess. De-energize or lock out any rotating equipment before installing or adjusting set screws on shafts. Ensure the mating thread is clean and free of debris before engagement. Follow applicable facility maintenance and machine safety procedures during installation.