Value Collection 581381PR Hex Socket Cap Screw 1/4-20 Unc

Product Description

The VALUE COLLECTION 581381PR is a hex socket cap screw designed for high-strength fastening applications in mechanical assembly, fabrication, and maintenance work. Featuring a 1/4-20 UNC thread and a 4-1/2 inch length under head, this screw is partially threaded to provide clamping force where it matters most. The 3/16 inch hex drive accepts a standard Allen wrench or hex bit. Constructed from alloy steel with a black oxide coating, it resists corrosion and surface wear under normal service conditions. Machinists, millwrights, and maintenance technicians commonly install this fastener type in equipment frames, fixtures, and structural assemblies.

This screw is suited for general industrial and mechanical applications where a partially threaded, socket-head cap screw is required. The 1/4-20 UNC thread pitch is one of the most common inch-series coarse thread standards, making this a widely applicable replacement or new-installation fastener. The black oxide finish makes it appropriate for applications where mild corrosion resistance and a low-reflectance appearance are needed. It conforms to ASME/ANSI B18.3 and ASTM A574 standards, which are the governing specifications for alloy steel hex socket cap screws in North American fastener practice.

Key Features

• 1/4-20 UNC coarse thread for broad compatibility with standard inch-series tapped holes
• 4-1/2 inch length under head accommodates deeper grip and clamping requirements
• Partially threaded shank provides shear strength and precise clamping
• 3/16 inch hex socket drive for Allen wrench or hex bit installation
• Alloy steel construction meets ASTM A574 mechanical property requirements
• Black oxide finish provides mild corrosion resistance and low-glare appearance

Compatibility

Designed as an OEM-style or replacement hex socket cap screw for any application requiring a 1/4-20 UNC partially threaded alloy steel fastener conforming to ASME/ANSI B18.3 and ASTM A574 standards.

Installation Notes

Installation is performed using a 3/16 inch hex key or Allen-head driver bit; ensure the drive tool seats fully before applying torque to avoid cam-out damage. Verify that the mating tapped hole is clean, properly threaded to 1/4-20 UNC, and free of debris before installation. Apply a thread lubricant or anti-seize compound if specified by the equipment manufacturer for the application. Do not exceed the torsional capacity of the fastener or the thread-strip limit of the base material.