Value Collection MP39039 Hex Cap Screw 5/16-18 X 3-1/2 in Grade 8

Product Description

The VALUE COLLECTION MP39039 is a partially threaded hex head cap screw built to Grade 8 steel specifications with a zinc yellow dichromate finish. Sized at 5/16-18 thread pitch and 3-1/2 inches under the head, this fastener delivers high tensile strength suited for demanding mechanical assemblies. The zinc yellow dichromate coating provides corrosion resistance while meeting ASME B18.2.1 dimensional standards. Sold in a pack of 25, this screw is a reliable choice for maintenance technicians, pipefitters, HVAC installers, and general mechanical trades requiring a high-strength inch-series fastener.

This fastener fits applications where UNC thread form and Grade 8 strength are required, including equipment mounting, bracket fabrication, mechanical support structures, and field repairs in HVAC, plumbing, and industrial service environments. The partial threading allows for load-bearing clamping across unthreaded shank length, making it appropriate for bolted joint assemblies where the shank passes through a clearance hole before engaging a nut or tapped bore.

Key Features

• Grade 8 steel construction for high tensile and proof load strength
• Zinc yellow dichromate finish for corrosion resistance in exposed environments
• Partially threaded shank per ASME B18.2.1 dimensional standard
• UNC thread form, 5/16-18 pitch for broad nut and tapped-hole compatibility
• 3-1/2 inch length under head suits medium-depth through-bolt applications
• Pack quantity of 25 supports job-site and service-truck stocking

Compatibility

Designed for use with standard 5/16-18 UNC nuts, washers, and tapped holes in inch-series mechanical assemblies requiring Grade 8 fastener strength.

Installation Notes

Installation should be performed by a qualified mechanic or trade technician using an appropriate hex wrench or socket driver sized for a 5/16-18 hex head cap screw. Ensure mating threads are clean and free of debris before installation. Do not exceed recommended clamp load for Grade 8 fasteners in the applicable joint design. Always follow relevant mechanical and safety codes for the equipment being serviced.