Value Collection MPFI0-400500-100BX 4-40 X 1/2 in Flat Head Screw

Product Description

The VALUE COLLECTION MPFI0-400500-100BX is a 4-40 UNC machine screw with a flat head and Phillips drive, supplied in a 100-piece box. Manufactured from Grade 2 steel with a zinc-plated finish, this fastener measures 1/2 inch in overall length and is designed for general-purpose assembly and maintenance applications. The countersunk flat head sits flush with the mating surface when installed in a properly prepared countersunk hole. This screw follows inch-system standards and is compatible with 4-40 UNC tapped holes commonly found in light-gauge metal, electronic enclosures, and mechanical assemblies.

This fastener is suited for light-duty industrial, electrical, and mechanical assembly work where a flush-mount Phillips-drive screw is required. Typical applications include panel assembly, junction box mounting, control enclosures, and equipment maintenance across commercial and light industrial settings. The zinc plating provides basic corrosion resistance for indoor and sheltered environments. Installation does not require specialized tooling beyond a standard Phillips screwdriver or bit.

Key Features

• 4-40 UNC thread form for use in standard inch-system tapped holes
• Flat countersunk head seats flush with the work surface
• Phillips drive compatible with standard No. 1 Phillips bits and screwdrivers
• Grade 2 steel construction for general-purpose fastening duty
• Zinc-plated finish for basic corrosion resistance in sheltered environments
• Sold in a 100-piece box for bench stock and maintenance inventory

Compatibility

Designed as a general-purpose replacement or stock fastener for any application requiring a 4-40 UNC thread, 1/2 inch overall length, flat head, Phillips drive machine screw in inch-system hardware.

Installation Notes

Installation requires a properly tapped or pre-threaded 4-40 UNC hole and a No. 1 Phillips screwdriver or bit driver. For flush seating, the receiving material must be countersunk to match the flat head angle before driving the screw. Do not overtighten — Grade 2 steel has lower tensile strength than higher-grade fasteners and is not rated for high-clamp-load or structural applications. Verify thread engagement depth before finalizing torque to avoid stripping the mating thread.