Value Collection 307042PR Hex Socket Cap Screw 4-40 Unc

Product Description

The VALUE COLLECTION 307042PR is a hex socket cap screw designed for secure fastening in precision assemblies where torque must be applied through an internal hex drive. Sized at 4-40 UNC with a 3/8 inch length under head, this screw is fully threaded and machined from alloy steel with a black oxide finish. The black oxide coating provides mild corrosion resistance and reduces light reflection in finished assemblies. With a 5/64 inch hex drive size, it is tightened using a standard hex key or Allen driver. This fastener meets ASTM A574 specifications, making it appropriate for structural and mechanical fastening applications.

This screw is suited for use in light mechanical assemblies, electronics enclosures, jigs and fixtures, and precision instrument work where a low-profile socket cap head is required. The 4-40 UNC thread is common in small-scale mechanical and electrical assembly, including panel mounting and component securing in both industrial and commercial settings. Installation is typically performed by machinists, maintenance technicians, or assembly personnel.

Key Features

• 4-40 UNC thread size for fine-pitch small fastener applications
• 3/8 inch length under head, fully threaded for maximum thread engagement
• 5/64 inch internal hex drive for use with standard hex keys
• Alloy steel construction meets ASTM A574 fastener standard
• Black oxide finish for mild corrosion resistance and reduced reflectivity

Compatibility

Designed as an OEM-style replacement or standard-fit hex socket cap screw for any 4-40 UNC threaded application requiring a 3/8 inch fully threaded alloy steel fastener.

Installation Notes

Installation requires a 5/64 inch hex key or Allen driver. Ensure the mating threaded hole is clean and free of debris before driving the screw. Power down any electrical equipment before fastening components within energized enclosures. Follow applicable mechanical assembly standards and torque practices appropriate to the material and joint being secured.