Value Collection 581439PR Hex Socket Cap Screw 5/16-18 Unc

Product Description

The VALUE COLLECTION 581439PR is a hex socket cap screw designed for fastening applications that require a compact, high-strength connection in tight spaces where a standard hex bolt head would not fit. This partially threaded fastener measures 6 inches in length under the head and accepts a 1/4-inch hex drive. It is machined from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and reduces surface glare. This screw is commonly installed by machinists, millwrights, maintenance technicians, and fabricators working on mechanical assemblies, fixtures, and structural components.

This screw suits residential and commercial applications across general manufacturing, equipment assembly, and structural fabrication. The 5/16-18 UNC thread is a widely used coarse-thread pitch that installs quickly and holds well in standard tapped steel or threaded inserts. The 6-inch length under the head makes it appropriate for thicker stack-ups or applications requiring extended thread engagement with a shank grip zone.

Key Features

• 5/16-18 UNC coarse thread for broad compatibility with standard tapped holes
• 6-inch length under head for deep grip and extended fastening reach
• Partially threaded shank provides a bearing surface for precise alignment
• 1/4-inch hex socket drive for use with standard hex keys or socket drivers
• Alloy steel construction delivers high tensile and shear strength
• Black oxide finish offers mild corrosion resistance and a low-reflectance surface
• Meets ASME/ANSI B18.3 and ASTM A574 standards for dimensional and mechanical conformance

Compatibility

Designed as an OEM-style replacement or standard fastener for use in any application requiring a 5/16-18 UNC partially threaded hex socket cap screw with a 6-inch length under head.

Installation Notes

Install with a 1/4-inch hex key or socket driver; ensure the mating tapped hole is clean and free of debris before driving. Power down or de-energize any equipment before accessing fastened assemblies on live machinery. Follow applicable torque guidelines from ASME standards for the specific joint material and screw grade. Do not over-drive — stop when the head is fully seated against the mating surface.