Value Collection D39150 Hex Head Cap Screw 5/8-11 X 2-1/4 in Grade 8

Product Description

The VALUE COLLECTION D39150 is a Grade 8 steel hex head cap screw with a 5/8-11 UNC thread and a 2-1/4 inch length under head. It features a zinc yellow dichromate finish that provides corrosion resistance in demanding service environments. The screw is partially threaded, conforming to ASME B18.2.1 standards for inch-series hex cap screws. This fastener is used by mechanical contractors, millwrights, maintenance technicians, and general tradespeople who require a high-strength, standard-geometry hex cap screw for structural and mechanical assembly work.

The D39150 is suited for industrial, commercial, and heavy-duty mechanical applications where Grade 8 tensile strength is required. Partially threaded shanks are preferred in applications where a smooth bearing surface is needed between clamped members, such as flange connections, structural steel assemblies, machinery mounts, and equipment fabrication. The 5/8-11 UNC thread pattern is one of the most common coarse-thread sizes found in trade and industrial work.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish for enhanced corrosion resistance
• Partially threaded shank per ASME B18.2.1 for clean bearing surface between clamped parts
• 5/8-11 UNC coarse thread — widely compatible with standard nuts and tapped holes
• 2-1/4 inch length under head for medium-depth fastening applications
• Inch measurement system; meets ASME B18.2.1 dimensional standard

Compatibility

Designed for use with standard 5/8-11 UNC hex nuts, lock nuts, and tapped holes conforming to inch-series thread standards. Suitable as a general-purpose replacement hex cap screw in any application requiring a Grade 8, 5/8-11 x 2-1/4 inch partially threaded fastener.

Installation Notes

Installation is performed by qualified mechanics, millwrights, or maintenance technicians using a standard hex wrench or impact driver with the appropriate socket size. Always verify that mating threads and tapped holes are clean and free of damage before installation. Torque to the value specified in the applicable engineering drawing or equipment service manual for Grade 8 fasteners of this diameter. Do not reuse fasteners that show signs of thread deformation, corrosion damage, or prior over-torquing.