Value Collection 3108MPU 5/16-18 X 1/2 in Flat Head Phillips Screw

Product Description

The VALUE COLLECTION 3108MPU is a 5/16-18 x 1/2 inch flat head Phillips machine screw manufactured from steel with a zinc finish. It features a countersunk flat head profile designed to sit flush with or below the surface of the mating material. The 5/16-18 thread designation indicates a 5/16 inch nominal diameter with 18 threads per inch — a coarse thread series commonly used in general mechanical and structural fastening applications. Rated to Grade J82 per ASME B18.6.3 and SAE J82 standards, this fastener is suited for use by mechanics, electricians, HVAC technicians, and maintenance professionals who require a reliable, standardized machine screw in everyday trade work.

This screw is used in residential and light commercial applications wherever a flush or countersunk fastener is needed in pre-tapped or clearance-drilled holes. Typical uses include panel mounting, equipment enclosures, junction box assembly, and general mechanical assembly on HVAC equipment, electrical panels, and plumbing fixtures. The zinc finish provides a basic level of corrosion resistance suitable for indoor and protected outdoor installations. This listing is sold as a minimum order quantity of 100 pieces per order.

Key Features

• 5/16-18 coarse thread series — compatible with standard tapped holes in steel and aluminum
• Flat head, Phillips drive — sits flush or countersunk in chamfered holes, driven with a standard Phillips screwdriver
• 1/2 inch overall length — compact fastener suited for thin material stack-ups
• Steel construction with zinc finish for corrosion resistance in indoor and protected environments
• Grade J82 per ASME B18.6.3 and SAE J82 — meets recognized fastener dimensional and mechanical standards
• Sold in multiples of 100 — practical for stocking in service vans or shop bins

Compatibility

Designed as a standard-dimension machine screw per ASME B18.6.3 and SAE J82, suitable for use in any application requiring a 5/16-18 coarse thread flat head Phillips fastener.

Installation Notes

Installation is performed by hand or with a standard Phillips screwdriver or drill driver set to appropriate torque to avoid stripping the head or cross-threading. Always ensure the receiving hole is properly tapped to 5/16-18 thread before driving. Do not over-torque — over-tightening a zinc-finished steel screw into aluminum or softer materials can cause thread damage or fastener failure. For electrical enclosure or panel work, follow NEC guidelines for appropriate fastener types and torque requirements.