Value Collection 121178PR Set Screw 3/8-16 X 3/4 in Cone Point

Product Description

The VALUE COLLECTION 121178PR is a Grade 8 alloy steel set screw designed for secure, positive-contact fastening in industrial and mechanical assemblies. With a 3/8-16 UNC thread and 3/4-inch overall length, this fastener uses a cone point to bite into or indent a mating surface, creating a firm hold that resists rotation and axial movement. Drive is a 3/16-inch hex socket, compatible with standard hex keys or Allen drivers. Manufactured to ASME/ANSI B18.3 and ASTM F912 standards, it meets consistent dimensional and mechanical requirements expected in precision applications.

This set screw is suited for securing collars, pulleys, gears, and hubs onto shafts in mechanical and electromechanical equipment. Cone point geometry is preferred when permanent or semi-permanent seating is required, as the point creates an indentation in the shaft for positive locking. Typical applications include motor shaft assemblies, conveyor components, and industrial equipment maintenance. Installation is performed by machinists, millwrights, maintenance mechanics, and assembly technicians working in manufacturing, HVAC equipment fabrication, or general mechanical service.

Key Features

• Cone point geometry for positive shaft indentation and high holding power
• Grade 8 alloy steel for elevated tensile and torsional strength
• 3/8-16 UNC thread for broad compatibility with standard tapped holes
• 3/16-inch hex drive accepts standard hex keys and Allen wrenches
• Manufactured to ASME/ANSI B18.3 and ASTM F912 for dimensional consistency

Compatibility

Designed as a standard UNC set screw for use in any tapped 3/8-16 threaded hole requiring a cone point fastener at 3/4-inch overall length.

Installation Notes

Installation is performed with a 3/16-inch hex key torqued to the fastener manufacturer or equipment OEM specification. De-energize and lock out all rotating equipment before servicing shaft-mounted components. Cone point set screws will indent the mating shaft surface upon tightening — confirm shaft material and surface condition are appropriate before installing. Follow applicable equipment service manuals and industry fastener standards when determining proper preload.