Value Collection 601278PR Set Screw 3/8-16 X 3 in Cup Point

Product Description

The VALUE COLLECTION 601278PR is a cup point set screw designed for clamping and positioning applications in mechanical assemblies. Manufactured from alloy steel, this fastener provides high holding strength and resistance to loosening under vibration and torque loads. The cup point geometry bites into the mating shaft for a secure grip without requiring a through-hole. Driven with a 3/16-inch hex key, the screw follows a 3/8-16 UNC thread pattern and measures 3 inches in overall length. It meets ASME/ANSI B18.3 and ASTM F912 standards. Machinists, millwrights, and maintenance technicians commonly install this type of fastener in shaft collars, pulleys, gears, and similar rotating components.

This set screw is suited for use in industrial and commercial mechanical assemblies where a headless, flush-mount fastener is required. Typical applications include securing hubs, sprockets, and couplings to shafts in conveyor systems, HVAC equipment drives, pump assemblies, and general power transmission setups. The 3/8-16 UNC thread is a widely used coarse-thread size that is compatible with standard tapped holes in steel, cast iron, and aluminum components.

Key Features

• Cup point geometry bites into the shaft surface for positive holding without shaft damage
• Alloy steel construction provides high tensile strength and hardness
• 3/8-16 UNC coarse thread for reliable engagement in standard tapped holes
• 3-inch overall length accommodates deeper shaft engagement requirements
• 3/16-inch hex drive for use with standard hex keys and Allen wrenches
• Meets ASME/ANSI B18.3 and ASTM F912 standards for dimensional and mechanical compliance

Compatibility

Designed as a standard-dimension replacement or stock set screw for any 3/8-16 UNC tapped hole application requiring a cup point, headless fastener per ASME/ANSI B18.3 and ASTM F912.

Installation Notes

Installation is performed by machinists, millwrights, or qualified maintenance technicians using a correctly sized 3/16-inch hex key or Allen wrench. De-energize and lockout/tagout any equipment before accessing shaft assemblies. Ensure the tapped hole is clean and free of debris before threading the screw. Do not exceed the rated torque for the thread size and material combination as specified by applicable ASME standards.