Value Collection 121154PR Set Screw 5/16-18 X 3/4 in Grade 8

Product Description

The VALUE COLLECTION 121154PR is a cone point set screw designed for positive locking and positioning applications in mechanical assemblies. Manufactured from Grade 8 alloy steel, it delivers high tensile strength and resistance to loosening under vibration and load. The cone point digs into or seats against a mating surface, creating a firm, concentrated hold. The 5/32-inch hex drive accepts a standard hex key for installation and removal. At 5/16-18 UNC threading and 3/4-inch overall length, this fastener suits a wide range of industrial and trade applications where a reliable, recessed set screw is required.

This set screw is used in collars, hubs, pulleys, shafts, and similar mechanical components found in HVAC equipment, pump assemblies, fan drives, and general industrial machinery. The cone point style is particularly effective when permanent or semi-permanent shaft positioning is needed, as the point creates an indent in the mating material for positive registration. Installation is straightforward and does not require access to the end of the fastener, making it well suited for flush or recessed applications. Sold individually per package, with a minimum order quantity of 100 pieces.

Key Features

• Grade 8 alloy steel construction for high strength and hardness
• Cone point geometry for positive shaft or surface engagement
• 5/16-18 UNC thread for broad compatibility with standard tapped holes
• 3/4-inch overall length suits medium-depth engagement applications
• 5/32-inch hex drive accommodates standard hex keys and L-wrenches
• Meets ASME/ANSI B18.3 and ASTM F912 fastener standards

Compatibility

Designed as a standard-dimension replacement or stock set screw for any assembly requiring a 5/16-18 UNC cone point set screw with a 5/32-inch hex drive, conforming to ASME/ANSI B18.3 and ASTM F912 specifications.

Installation Notes

Installation is performed with a 5/32-inch hex key or L-wrench. Ensure the tapped hole is clean and free of debris before threading the screw. De-energize and lock out any equipment before servicing rotating components such as shafts, pulleys, or hubs. Do not overtighten, as cone point set screws can permanently deform softer shaft materials.