Value Collection 581383PR Hex Socket Cap Screw 1/4-20 Unc

Product Description

The VALUE COLLECTION 581383PR is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling, and structural fixtures. It features a 1/4-20 UNC thread form with a 5-inch length under head and is partially threaded, allowing the unthreaded shank to bear shear loads in precision-fit applications. The screw is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and reduces light reflection. A 3/16-inch hex drive socket is required for installation. This fastener meets ASME/ANSI B18.3 and ASTM A574 standards, confirming it is rated for socket head cap screw service loads.

The 581383PR is suited for use in machine shops, manufacturing facilities, maintenance environments, and general industrial assemblies wherever a high-tensile, recessed-drive cap screw is required. The partial threading makes it well suited for through-hole and clearance-hole applications where a tight grip on mating surfaces or a shoulder effect is needed. It is commonly installed by machinists, millwrights, and maintenance technicians working on jigs, fixtures, hydraulic components, and mechanical enclosures.

Key Features

• 1/4-20 UNC thread form for broad compatibility with standard inch-series tapped holes
• 5-inch length under head accommodates deeper assemblies and stacked material
• Partially threaded shank provides shear strength and precision fit in clearance holes
• Alloy steel construction delivers high tensile and proof load per ASTM A574
• Black oxide finish offers mild corrosion resistance and a low-glare surface
• Conforms to ASME/ANSI B18.3 dimensional standards for socket head cap screws

Compatibility

Designed as an OEM-style replacement or standard fastener for applications requiring a 1/4-20 UNC hex socket cap screw meeting ASME/ANSI B18.3 and ASTM A574 specifications.

Installation Notes

Installation should be performed by a qualified machinist or maintenance technician using a calibrated 3/16-inch hex key or T-handle driver. Ensure the mating tapped hole is clean, free of debris, and cut to the correct thread class before installing. Do not exceed the load ratings implied by ASTM A574 for this diameter and grade. Apply thread-locking compound or specified torque per the assembly's engineering documentation rather than estimating by feel.