Holo-krome 72122 Hex Socket Cap Screw 5/16-18 Unc

Product Description

The HOLO-KROME 72122 is a hex socket cap screw designed for high-strength fastening applications in mechanical assemblies, tooling, and equipment maintenance. Threaded 5/16-18 UNC and fully threaded along its 5/8 inch length under head, this fastener accepts a 1/4 inch hex drive. It is manufactured from alloy steel and finished with a black oxide coating that provides mild corrosion resistance and reduces surface glare. Compliance with ASME B18.3 and ASTM A574 confirms it meets recognized dimensional and mechanical property standards for socket cap screws. Machinists, millwrights, and maintenance technicians are the typical installers.

This screw is suited for use in machinery frames, fixture plates, jigs, and fabricated assemblies where a recessed drive is preferred to keep fastener heads flush or below the surface. The 5/16-18 UNC thread form is a common coarse-thread size found across a wide range of industrial and commercial equipment. The compact 5/8 inch length under head makes it appropriate for thinner material stacks or close-clearance applications where a longer fastener would bottom out or protrude.

Key Features

• 5/16-18 UNC fully threaded alloy steel socket cap screw
• 5/8 inch length under head for use in shallow or tight fastening locations
• 1/4 inch hex drive for standard hex keys and hex bit drivers
• Black oxide finish provides mild corrosion resistance and low-glare appearance
• Meets ASME B18.3 dimensional standard and ASTM A574 mechanical property requirements

Compatibility

Designed as a standard 5/16-18 UNC hex socket cap screw suitable for use wherever ASME B18.3 socket head cap screws of this thread size and length are specified.

Installation Notes

Installation is performed by machinists, millwrights, or maintenance technicians using a 1/4 inch hex key or hex bit driver. Verify that mating threads are clean and free of debris before driving. Do not exceed the torque rating specified by the assembly designer or equipment manufacturer for this thread size and material grade. Always de-energize and lock out equipment before performing fastener service on mechanical assemblies.