Value Collection 3172MSF 5/16-18 X 4.5 in Flat Head Slotted Screw

Product Description

The VALUE COLLECTION 3172MSF is a 5/16-18 unified coarse thread machine screw with a flat head and slotted drive, manufactured from steel with a zinc finish. At 4.5 inches overall length, this fastener is suited for general-purpose mechanical assembly where a flush or countersunk surface is required. It conforms to ASME B18.6.3 and SAE J82 standards, making it appropriate for structural and mechanical applications where dimensional consistency and material grade compliance matter. Tradespeople and maintenance technicians use this type of fastener in equipment panels, enclosures, and mechanical assemblies across HVAC, electrical, and general industrial settings.

This screw is intended for use in applications requiring a 5/16-18 UNC thread engagement. The flat head profile sits flush with or below the mating surface when installed in a countersunk hole, which is common in sheet metal panels, equipment housings, and fabricated assemblies. The zinc finish provides a baseline level of corrosion resistance suitable for indoor and light-duty environments. Sold individually per package, with a minimum order quantity of 50 units.

Key Features

• 5/16-18 unified coarse thread for broad compatibility with standard tapped holes
• Flat head profile for flush or countersunk installation in panels and housings
• Slotted drive compatible with standard flat-blade screwdrivers
• Steel construction with zinc finish for baseline corrosion resistance
• Meets ASME B18.6.3 and SAE J82 dimensional and material grade standards
• 4.5 inches overall length suits deeper thread engagement or thicker assemblies

Compatibility

Designed for use in any application requiring a 5/16-18 UNC flat head slotted machine screw at 4.5 inches overall length, including mechanical assemblies, equipment enclosures, and fabricated panels where countersunk fasteners are specified.

Installation Notes

Installation is typically performed by maintenance technicians, electricians, or equipment assemblers using a flat-blade screwdriver or slotted bit driver. Ensure the mating hole is properly tapped to 5/16-18 UNC thread form and that a countersink is machined to the appropriate angle for a flat head screw before driving. De-energize and lock out any equipment before servicing panels or enclosures where these fasteners are used. Do not over-torque; follow the torque specifications listed in the equipment manufacturer's service documentation.