Value Collection 409081PR Set Screw 3/8-16 X 4 in Cup Point

Product Description

The VALUE COLLECTION 409081PR is a 3/8-16 x 4 inch cup point set screw manufactured from Grade 2 alloy steel. Set screws are fully threaded fasteners with no head, designed to secure a component — such as a pulley, collar, or gear — against or onto a shaft by applying compressive force at the point of contact. The cup point geometry bites into the mating surface to resist rotation and axial movement. This fastener uses a square drive and follows the Unified National Coarse (UNC) thread standard. It is a common choice in mechanical assemblies where a flush or recessed fastener is required.

This set screw is suited for industrial, mechanical, and light fabrication applications where a 3/8-16 UNC thread is specified. It is used in shaft collars, set collar assemblies, drive components, and mechanical linkages across a wide range of equipment. Installation is performed by machinists, millwrights, and maintenance technicians. Length is measured under the head per standard convention. The minimum order quantity for this part is 10 pieces.

Key Features

• Cup point geometry bites into mating shaft surface to resist rotation and axial movement
• Square drive accepts a standard square key wrench for high torque installation in tight spaces
• 3/8-16 UNC thread for broad compatibility with standard tapped holes
• Grade 2 alloy steel construction for adequate strength in general mechanical assemblies
• 4 inch length accommodates deep thread engagement or through-hole applications
• Fully threaded, headless design allows flush or below-surface installation

Compatibility

Designed for use in any assembly with a 3/8-16 UNC tapped hole requiring a headless cup point set screw with a 4 inch length under head.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a correctly sized square key wrench. De-energize and lockout all equipment before servicing any rotating assembly. Do not overtighten — excessive force can strip the drive recess or damage the mating shaft surface. Confirm thread engagement is clean and the hole is free of debris before driving the screw to final position.