Value Collection -33643-1 Hex Socket Cap Screw 3/8-16 Unc

Product Description

The VALUE COLLECTION -33643-1 is a partially threaded hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, fixtures, and structural connections. It features a 3/8-16 UNC thread size and a 4.5-inch length under head, providing deep thread engagement for secure clamping. The 5/16-inch hex drive accepts a standard Allen key or hex bit. Manufactured from alloy steel with a black oxide finish, this fastener resists corrosion and surface wear under typical shop and field conditions. It meets ASME/ANSI B18.3 and ASTM A574 standards, making it appropriate for demanding mechanical and industrial installations.

This screw is suited for use in general industrial equipment, machinery frames, jigs, fixtures, and fabricated assemblies where a recessed-drive, high-strength cap screw is required. The partial threading allows the unthreaded shank to bear shear loads, which is useful in precision alignment applications. This fastener is a stock item commonly used by machinists, millwrights, maintenance technicians, and fabricators working across both light and heavy industrial environments.

Key Features

• 3/8-16 UNC thread size for standard inch-series fastener compatibility
• 4.5-inch length under head for deep material engagement
• Partially threaded shank to support shear load and alignment functions
• 5/16-inch hex socket drive for Allen key or hex bit installation
• Alloy steel construction with black oxide coating for corrosion resistance
• Meets ASME/ANSI B18.3 and ASTM A574 standards

Compatibility

Designed as an OEM-style replacement or stock fastener for general industrial and mechanical assemblies requiring a 3/8-16 UNC partially threaded hex socket cap screw.

Installation Notes

Installation requires a 5/16-inch hex key or socket bit driver. Ensure mating threaded holes are clean and free of debris before driving. Follow applicable torque specifications from the equipment manufacturer or relevant ASME standards for alloy steel fasteners of this size grade. De-energize and lock out any equipment before performing fastener service on live machinery.