Value Collection 581389PR Hex Socket Cap Screw 1/4-20 Unc

Product Description

The VALUE COLLECTION 581389PR is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling, and industrial equipment. It features a 1/4-20 UNC thread with a 7-inch length under the head and is partially threaded, allowing the unthreaded shank to bear shear loads in clearance-hole applications. The 3/16-inch hex drive accepts a standard hex key or Allen-type bit driver. Constructed from alloy steel with a black oxide finish, the 581389PR delivers solid corrosion resistance and a clean, consistent appearance. Licensed tradespeople, machinists, and maintenance technicians working in fabrication, assembly, or equipment service will find this screw suited to demanding fastening needs.

This socket cap screw is intended for use in medium-to-heavy mechanical assemblies where a low-profile head and high clamping force are required. The partial threading makes it well-suited for applications where the bolt shank passes through a clearance hole before engaging a tapped bore, such as machine bases, fixtures, brackets, and structural joints. The black oxide alloy steel construction is appropriate for indoor and semi-protected environments where moderate corrosion resistance is acceptable.

Key Features

• 1/4-20 UNC thread for compatibility with standard tapped holes and nuts
• 7-inch length under head for deep-reach or thick-stack fastening
• Partially threaded shank supports shear-load clearance-hole installations
• 3/16-inch hex socket drive accepts standard hex keys and bit drivers
• Alloy steel construction meets ASME/ANSI B18.3 and ASTM A574 standards
• Black oxide finish provides mild corrosion resistance and reduced light reflection

Compatibility

Designed as a standard 1/4-20 UNC hex socket cap screw conforming to ASME/ANSI B18.3 and ASTM A574, suitable for use in any tapped or through-hole assembly that accepts a 1/4-20 thread pattern and a 3/16-inch hex drive.

Installation Notes

Installation is typically performed by machinists, millwrights, or maintenance technicians using a 3/16-inch hex key or Allen bit driver. Ensure the mating tapped hole is clean and free of debris before driving the screw. Power down and de-energize any equipment before fastener service on live machinery. Do not exceed the torque capacity of the thread or the drive socket, and inspect threads for damage before reinstallation.