Value Collection 581436PR Hex Socket Cap Screw 5/16-18

Product Description

The VALUE COLLECTION 581436PR is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling, and structural fabrication. Threaded 5/16-18 UNC, this screw measures 9 inches under the head and is partially threaded, making it well suited for applications that require a clamping grip on a smooth shank. It is driven with a 1/4-inch hex (Allen) key. Constructed from alloy steel with a black oxide finish, it meets ASME/ANSI B18.3 and ASTM A574 standards, which specify dimensional and tensile requirements for socket head cap screws. Machinists, maintenance technicians, and fabricators typically specify this fastener where a flush or recessed drive profile is required.

This fastener is used across a broad range of industrial and mechanical service work, including machine tool assembly, jig and fixture building, equipment maintenance, and structural bracketing. The partial threading allows the unthreaded shank to bear shear loads and align mating components before the threads engage. The black oxide coating provides mild corrosion resistance and a low-reflectance appearance. It is appropriate for indoor and sheltered applications where exposure to standing moisture is limited.

Key Features

• 5/16-18 UNC thread for broad compatibility with standard tapped holes
• 9-inch length under head accommodates deep through-hole and long-reach clamping setups
• Partially threaded shank for shear load bearing and component alignment
• 1/4-inch hex drive for use with standard Allen keys and hex bit drivers
• Alloy steel construction meets ASTM A574 tensile requirements
• Black oxide finish for mild corrosion resistance and reduced glare

Compatibility

Designed as a standard 5/16-18 UNC hex socket cap screw conforming to ASME/ANSI B18.3, compatible with any standard 5/16-18 UNC tapped hole accepting a socket head cap screw per that specification.

Installation Notes

Installation is performed by machinists, maintenance technicians, or assemblers using a 1/4-inch hex key or hex bit driver. Ensure the tapped hole is clean and free of debris before installation. Do not exceed the rated tensile capacity of the fastener by over-torquing; consult published torque tables for ASTM A574 alloy steel socket cap screws at this diameter and thread pitch. Black oxide is not a heavy corrosion barrier - apply thread lubricant or anti-seize in environments with moisture exposure.