Value Collection BH031C138N Hex Head Cap Screw 5/16-18

Product Description

The VALUE COLLECTION BH031C138N is a Grade 8 steel hex head cap screw with a 5/16-18 UNC thread and a 1-3/8 inch length under head. Grade 8 steel offers high tensile strength suited for demanding fastener applications. A zinc-plated finish provides corrosion resistance in general-purpose environments. This fastener meets ASTM A354 BD and MIL-HDBK-57 standards, making it appropriate for structural, mechanical, and industrial assembly work performed by maintenance technicians, millwrights, pipefitters, and general tradespeople.

This cap screw is used in residential and commercial mechanical assemblies where a high-strength, UNC-threaded fastener is required. Typical applications include equipment mounting, bracket attachment, and structural joint assembly across HVAC, plumbing, electrical, and general industrial installations. The 5/16-18 thread size is a common standard in trade applications, and the 1-3/8 inch under-head length accommodates moderate stack thicknesses in panel and frame work.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• 5/16-18 UNC thread for broad tool and hardware compatibility
• Zinc-plated finish for corrosion resistance in general-purpose use
• Meets ASTM A354 BD and MIL-HDBK-57 standards
• 1/2 inch hex key size for standard wrench and socket drive installation
• 1-3/8 inch length under head suits medium-depth fastening applications

Compatibility

Designed as a standard UNC hex head cap screw suitable for use in any application requiring a 5/16-18 x 1-3/8 inch Grade 8 fastener conforming to ASTM A354 BD or MIL-HDBK-57 specifications.

Installation Notes

Installation requires a 1/2 inch wrench or socket driver. Power down or de-energize any associated equipment before fastening components in electrical or HVAC assemblies. Follow applicable torque guidelines from the equipment manufacturer or relevant trade standards for Grade 8 fasteners in the specific joint application. Inspect threads for damage before installation and do not reuse fasteners that show deformation or corrosion.