Value Collection 580771PR 5/16-18 X 2.5in Flat Head Slotted Screw

Product Description

The VALUE COLLECTION 580771PR is a 5/16-18 x 2.5 inches overall length machine screw designed for general fastening applications across industrial, mechanical, and construction assemblies. It features a flat head with a slotted drive, allowing installation with a standard flat-blade screwdriver. Manufactured from steel with a zinc finish, this screw carries a Grade 2 material rating and is threaded in Unified National Coarse (UNC) form. The full-length thread runs the entire 2.5 inches under the head, providing consistent engagement across the fastened material stack. Sold individually, with a minimum order quantity of 100 pieces.

This screw is suited for light- to medium-duty fastening tasks in mechanical assemblies, electrical enclosures, equipment panels, and structural brackets. The flat head sits flush with or countersunk into the mating surface, making it appropriate where a low-profile finish is required. The zinc coating provides basic corrosion resistance for indoor and light-exposure environments. Trades including electricians, HVAC technicians, plumbers, and general maintenance mechanics routinely use this screw type in equipment access panels, junction boxes, and component mounting applications.

Key Features

• 5/16-18 UNC thread — coarse pitch for fast engagement and strong pull-out resistance in steel and aluminum
• 2.5 inches overall length with full thread under head for maximum thread engagement
• Flat head profile allows flush or countersunk installation in prepared holes
• Slotted drive accepts standard flat-blade screwdrivers — no specialty tooling required
• Zinc finish provides basic corrosion resistance for indoor and light-duty service environments
• Grade 2 steel construction suitable for general-purpose fastening loads

Compatibility

Designed as a general-purpose UNC machine screw for use in any 5/16-18 threaded hole or with a corresponding nut, suitable for steel, aluminum, and similar materials in light- to medium-duty mechanical assemblies.

Installation Notes

Install using a flat-blade screwdriver sized to match the slotted head. For countersunk applications, ensure the mating surface is properly chamfered or countersunk to the correct angle before driving the screw. Do not overtighten Grade 2 fasteners — they carry lower proof load ratings than Grade 5 or Grade 8 hardware. Follow applicable mechanical and electrical codes when used in equipment assemblies requiring specific fastener grades.