Value Collection 121004PR Set Screw 4-40 X 3/16 in Grade 8

Product Description

The VALUE COLLECTION 121004PR is a Grade 8 alloy steel set screw designed for secure, load-bearing fastening applications in mechanical assemblies. With a 4-40 UNC thread size and an overall length of 3/16 inches, this cone point set screw bites into mating surfaces to resist rotation and axial movement. Drive type is hex socket, requiring a 0.050-inch hex key for installation. Manufactured to ASME/ANSI B18.3 and ASTM F912 standards, this fastener is suited for machinists, millwrights, maintenance technicians, and assemblers working with precision components.

This set screw is commonly used in shaft-to-hub connections, collars, pulleys, and gear assemblies where positive locking without a protruding fastener head is required. The cone point geometry concentrates clamping force at a single contact point, making it appropriate for permanent or semi-permanent installations in both light industrial and commercial mechanical systems. Sold in multiples of 100 per minimum order.

Key Features

• Cone point geometry for concentrated locking force on mating shaft or surface
• Grade 8 alloy steel construction for high tensile and torsional strength
• 4-40 UNC thread for precise, fine-pitch engagement
• Hex socket drive requiring a 0.050-inch hex key
• Conforms to ASME/ANSI B18.3 and ASTM F912 fastener standards
• Headless design sits flush or below surface for clean, snag-free assemblies

Compatibility

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

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using the correct 0.050-inch hex key to avoid rounding the drive socket. Ensure the mating shaft or surface is clean and properly aligned before torquing. Do not overtighten, as cone point set screws can permanently deform soft shaft materials. Always verify thread engagement depth meets design requirements before returning the assembly to service.