Armor Coat UST235843 Hex Head Cap Screw 5/8-11 Grade 8

Product Description

The ARMOR COAT UST235843 is a Grade 8 steel hex head cap screw designed for high-strength fastening applications across mechanical, structural, and industrial assemblies. It features a 5/8-11 UNC thread and a 2.25-inch length under head with partial threading, conforming to ASME B18.2.1 and SAE J429 standards. The Armor Coat finish provides corrosion resistance suitable for demanding service environments. This fastener is installed by millwrights, pipefitters, HVAC technicians, and general contractors wherever a high-tensile, inch-series hex cap screw is specified.

This screw is used in applications requiring a Grade 8 tensile rating, including equipment mounting, machinery assembly, structural steel connections, and heavy-duty bracket installations. The partial thread design allows for greater grip length in thick material stack-ups. The UNC 5/8-11 thread pitch is a standard inch-series coarse thread widely found in HVAC equipment frames, pump bases, and mechanical system supports.

Key Features

• Grade 8 steel construction meets SAE J429 high-strength fastener requirements
• Partially threaded shank provides extended grip length for thick material assemblies
• Armor Coat finish delivers corrosion protection over bare steel
• 5/8-11 UNC coarse thread for broad tool and hardware compatibility
• Conforms to ASME B18.2.1 and ASME/ANSI B18.2.1 dimensional standards
• 2.25-inch length under head suits a range of structural fastening needs

Compatibility

Designed as a standard inch-series hex head cap screw for use in any application requiring a 5/8-11 UNC, Grade 8, partially threaded fastener per ASME B18.2.1 specifications.

Installation Notes

Installation should be performed by a qualified mechanic, millwright, or trade professional familiar with high-strength fastener practices. Always verify the mating nut or tapped hole is rated for Grade 8 loading before assembly. Use a calibrated torque wrench and follow the applicable industry torque specification for 5/8-11 Grade 8 fasteners as defined by the equipment manufacturer or relevant structural standard. Inspect threads for damage before installation and do not reuse fasteners that show signs of yielding or corrosion.