Value Collection D39157 Hex Cap Screw 5/8-11 X 4 in Grade 8

Product Description

The VALUE COLLECTION D39157 is a partially threaded hex head cap screw designed for high-strength fastening applications in mechanical, structural, and industrial assemblies. Manufactured from Grade 8 steel with a zinc yellow dichromate finish, this fastener delivers superior tensile strength and corrosion resistance compared to lower-grade alternatives. The 5/8-11 UNC thread size and 4-inch length under head make it suitable for through-bolt and tapped-hole applications where heavy load transfer is required. Conforming to ASME B18.2.1, this screw meets recognized dimensional standards for inch-series hex head cap screws, making it a reliable choice for tradespeople working to specification.

This fastener is used across a broad range of trade and industrial applications including HVAC equipment mounting, structural steel connections, machinery assembly, and heavy-duty equipment fabrication. The partial threading is well suited for applications requiring a smooth shank section for shear loading or precise location within a clearance hole. Installers in mechanical, construction, and industrial maintenance trades will encounter this size in equipment frames, brackets, and flanged connections where Grade 8 strength is specified by the engineer or equipment manufacturer.

Key Features

• Grade 8 steel construction provides high tensile and proof load strength for demanding fastening applications
• Zinc yellow dichromate finish offers corrosion resistance and is visually identifiable as a Grade 8 fastener
• Partially threaded shank supports shear loading and precise hole location in clearance-fit assemblies
• 5/8-11 UNC thread form is the standard coarse-thread series for this diameter
• Conforms to ASME B18.2.1 for dimensional consistency with standard hex head cap screw tooling and specifications

Compatibility

Designed as a standard inch-series hex head cap screw compatible with any 5/8-11 UNC tapped hole or nut conforming to ASME B18.2.1 dimensional requirements.

Installation Notes

Installation is typically performed by mechanics, millwrights, pipefitters, or general tradespeople using a standard hex wrench or socket. Always verify that the mating thread, nut, or tapped hole is also rated for Grade 8 loading before assembly. Do not mix Grade 8 fasteners with lower-grade nuts in structural or high-load joints. Follow applicable codes and engineering specifications for required torque values, as proper clamp load is critical to joint integrity.