Value Collection R52001079 Flat Head Machine Screw 1/4-20

Product Description

The VALUE COLLECTION R52001079 is a flat head slotted machine screw designed for general-purpose fastening in metal and hard-material assemblies. It features a 1/4-20 unified coarse thread, an overall length of 3.5 inches, and a countersunk flat head profile that sits flush with or below the mating surface when installed. The screw is manufactured from steel with a zinc plating finish that provides basic corrosion resistance for indoor and light-duty applications. It conforms to ASME B18.6.3 and SAE J82 dimensional and grade standards. This fastener is installed by maintenance technicians, millwrights, and general tradespeople using a standard slotted flat-blade screwdriver or bit.

This screw is suited for mechanical assemblies, equipment enclosures, brackets, and structural subassemblies where a flush-seating fastener is required. The 1/4-20 thread pitch is a widely used coarse-thread standard in both light industrial and commercial maintenance work. The full-length thread engagement along the 3.5-inch shank makes it practical for thicker stack-ups or through-fastening applications. No washer is included or specified with this fastener, consistent with its flat head countersunk design.

Key Features

• Flat countersunk head profile seats flush with the mating surface
• Slotted drive accepts standard flat-blade screwdriver or bit
• 1/4-20 unified coarse thread for broad compatibility with standard tapped holes
• Zinc-plated steel construction for basic corrosion resistance
• Conforms to ASME B18.6.3 and SAE J82 standards
• No-washer style; overall length equals length under head at 3.5 inches

Compatibility

Designed as a standard 1/4-20 coarse-thread machine screw for use in tapped holes or with standard 1/4-20 hex nuts and threaded inserts in general mechanical and industrial fastening applications.

Installation Notes

This fastener is installed by qualified tradespeople or maintenance technicians using a flat-blade screwdriver or slotted bit sized to the head recess. The mating material should have a properly sized and tapped 1/4-20 hole or a pre-installed threaded insert; cross-threading will damage both the screw and the tapped surface. When used in countersunk applications, verify the countersink angle matches the flat head geometry before final seating. Do not over-torque; follow applicable equipment manufacturer torque specifications for the assembly being serviced.