Value Collection 121118PR Set Screw 1/4-20 X 3/4 in Cone Point

Product Description

The VALUE COLLECTION 121118PR is a 1/4-20 UNC cone point set screw manufactured from Grade 8 alloy steel. At 3/4 inches in overall length, it is driven with a 1/8-inch hex key and conforms to ASME/ANSI B18.3 and ASTM F912 standards. Cone point set screws are designed to bite into a mating surface or shaft, creating a strong frictional hold that resists rotation and axial movement. This type of fastener is installed by machinists, millwrights, and maintenance technicians in mechanical assemblies where a collar, pulley, gear, or cam must be locked to a shaft.

This set screw is suited for mechanical and industrial applications requiring a secure, permanent or semi-permanent shaft-to-hub connection. The cone point geometry concentrates clamping force at a single contact point, making it effective on shafts where indentation is acceptable or desired. Typical use cases include motor shaft collars, shaft couplings, set collar assemblies, and rotating machine components found in both light industrial and heavy manufacturing environments.

Key Features

• Cone point geometry concentrates holding force and creates a positive indent on the mating shaft surface
• Grade 8 alloy steel construction provides high tensile strength for demanding mechanical applications
• 1/4-20 UNC thread for broad compatibility with standard tapped holes
• 1/8-inch hex drive allows installation with a standard hex key or Allen wrench
• Meets ASME/ANSI B18.3 and ASTM F912 dimensional and material standards

Compatibility

Designed as a standard 1/4-20 UNC cone point set screw for use in any tapped hole conforming to ASME/ANSI B18.3 specifications where a 3/4-inch overall length and cone point geometry are required.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 1/8-inch hex key. Always de-energize and lock out the equipment before working on any rotating assembly. Thread the set screw into the tapped hole by hand before applying torque to avoid cross-threading. Do not exceed the rated capacity of the tapped hole material, and inspect the mating shaft for proper surface condition before final tightening.