Holo-krome 72136 Hex Socket Cap Screw 5/16-18 Unc 2 in

Product Description

The HOLO-KROME 72136 is a hex socket cap screw designed for high-strength mechanical fastening in industrial, commercial, and trade applications. It features a 5/16-18 UNC thread with a 2-inch length under the head and is partially threaded, which helps maintain clamping load in thicker assemblies. The drive is a 1/4-inch internal hex socket, engaged with a standard Allen key or hex bit driver. Constructed from alloy steel with a black oxide finish, this fastener delivers solid tensile strength and moderate corrosion resistance in controlled environments. Machinists, millwrights, maintenance technicians, and HVAC equipment installers commonly use this type of fastener when securing brackets, panels, and mechanical assemblies.

This screw is suited for use in mechanical assemblies, equipment panels, structural brackets, and machinery frames where a recessed-drive, high-torque fastener is required. The 5/16-18 UNC coarse thread is a widely used size in North American manufactured equipment and replacement components. The partial thread design is appropriate for through-bolting and clamping applications where the unthreaded shank spans across mating materials. It meets ASME B18.3 and ASTM A574 standards, making it appropriate for demanding mechanical fastening work.

Key Features

• 5/16-18 UNC coarse thread for broad compatibility with standard North American hardware
• 2-inch length under head with partial threading for clamping and through-bolt applications
• 1/4-inch internal hex socket drive for high torque transfer with a standard Allen key or hex bit
• Alloy steel construction meets ASTM A574 for high-strength fastener requirements
• Black oxide coating provides mild corrosion resistance and reduces surface galling
• Meets ASME B18.3 dimensional standard for socket cap screws

Compatibility

Designed as a standard ASME B18.3 hex socket cap screw suitable for general mechanical assemblies, equipment panels, and structural brackets requiring a 5/16-18 UNC partially threaded fastener.

Installation Notes

Installation is performed with a 1/4-inch hex key or hex socket bit driver. Ensure the mating threaded hole or nut is clean and free of debris before driving. Apply appropriate thread engagement depth per ASME guidelines for the material being fastened. Do not exceed rated torque for the alloy grade, and always de-energize or lock out any equipment before accessing fastener locations on powered machinery.