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

Product Description

The VALUE COLLECTION 33643 is a partially threaded hex socket cap screw designed for secure, high-torque fastening in demanding mechanical and structural applications. It features a 3/8-16 UNC thread size with a 4-inch length under the head and is driven by a 5/16-inch hex key. Constructed from alloy steel with a black oxide finish, this fastener delivers solid tensile strength and moderate corrosion resistance. It conforms to ASME/ANSI B18.3 and ASTM A574 standards, making it a recognized choice for precision fastening work in trade and industrial settings.

This cap screw is suited for mechanical assemblies, machinery maintenance, jig and fixture work, and general industrial fabrication where a recessed-drive, high-strength fastener is required. The partial threading allows the unthreaded shank to act as a shoulder, providing precise locating and shear resistance. It is commonly installed by millwrights, maintenance technicians, and pipefitters working on equipment assemblies and structural connections.

Key Features

• 3/8-16 UNC thread for broad compatibility with standard inch-thread tapped holes
• 4-inch length under head with partial threading for shear load and locating applications
• 5/16-inch hex drive for use with standard hex keys and T-handle drivers
• Alloy steel construction meets ASTM A574 high-strength fastener requirements
• Black oxide coating provides mild corrosion resistance and reduces light glare on exposed fasteners
• Conforms to ASME/ANSI B18.3 dimensional standards

Compatibility

Designed as an OEM-style replacement or standard fastener for any application requiring a 3/8-16 UNC partially threaded hex socket cap screw meeting ASME/ANSI B18.3 and ASTM A574 specifications.

Installation Notes

Installation requires a properly sized 5/16-inch hex key or Allen driver. Ensure the mating tapped hole is clean and free of debris before threading. Power down and de-energize any associated equipment before fastener replacement or assembly work. Do not exceed the rated torque for 3/8-16 alloy steel fasteners as specified in your equipment service documentation.