Value Collection MP39030 Hex Cap Screw 5/16-18 Grade 8 50 Pack

Product Description

The VALUE COLLECTION MP39030 is a fully threaded hex head cap screw designed for high-strength mechanical fastening applications. Sized at 5/16-18 UNC thread with a 1-1/4 inch length under head, this fastener is manufactured from Grade 8 steel and finished with a zinc yellow dichromate coating for corrosion resistance. Meets ASME B18.2.1 and SAE J429 standards, making it suitable for structural and load-bearing assemblies where a verified tensile and proof load rating is required. Sold in a pack of 50 fasteners. Installers in HVAC, plumbing, electrical, and general mechanical trades commonly specify Grade 8 hardware for vibration-prone or high-load connection points.

This screw is appropriate for a wide range of industrial and trade applications including equipment mounting, bracket fastening, and structural panel assembly. The fully threaded shank provides maximum thread engagement across the grip length, which is advantageous in thin-material or close-tolerance installations. The zinc yellow dichromate finish provides a baseline level of protection against oxidation in typical indoor and light-duty outdoor environments. The 5/16-18 UNC thread pattern is a standard Unified National Coarse designation, compatible with matching 5/16-18 nuts and tapped holes throughout the inch-standard fastener ecosystem.

Key Features

• Grade 8 steel construction — high tensile strength for load-bearing and structural connections
• Fully threaded shank — maximizes thread engagement across the full 1-1/4 inch length under head
• Zinc yellow dichromate finish — provides corrosion inhibition for general-purpose use
• 5/16-18 UNC thread — standard coarse-thread pitch, compatible with industry-standard nuts and tapped components
• Meets ASME B18.2.1 and SAE J429 — verified dimensional and mechanical property standards
• Pack of 50 — reduces per-unit cost for volume fastening tasks

Compatibility

Designed as a standard inch-series hex head cap screw for use with any 5/16-18 UNC threaded nut, insert, or tapped hole in steel, aluminum, or comparable structural materials.

Installation Notes

Installation is performed with a standard 1/2 inch hex wrench or socket driver. Always verify that mating threads are clean and free of debris before driving. Follow applicable torque specifications from the equipment manufacturer or relevant mechanical codes for Grade 8 fasteners at this thread size. Do not mix Grade 8 hardware with lower-grade nuts or threaded inserts, as mismatched grades can result in thread stripping under load.