Value Collection MPFI0-400250-100BX Machine Screw 4-40

Product Description

The VALUE COLLECTION MPFI0-400250-100BX is a 4-40 UNC machine screw with a flat head and Phillips drive, sold in a box of 100. It is manufactured from Grade 2 steel with a zinc-plated finish for basic corrosion resistance. At 0.25 inches in overall length, this fastener is designed for light-duty mechanical assembly where a flush-mounted fastener is required. The flat head countersinks into the mating surface, creating a smooth, low-profile finish. Electricians, HVAC technicians, panel assemblers, and general trade professionals commonly use 4-40 fasteners when securing small components, terminal strips, control boards, or sheet metal brackets in equipment enclosures.

This screw is suited for residential and commercial applications involving light-gauge steel, aluminum, and plastic substrates where a 4-40 tapped hole is present. Common use cases include securing control boards, small electrical components, enclosure panels, and instrumentation hardware. The Phillips drive allows for fast installation with standard hand tools or a powered screwdriver. The overall and under-head length are both 0.25 inches, making this screw appropriate for shallow fastening applications where thread engagement is limited by material thickness.

Key Features

• 4-40 UNC thread form for compatibility with standard tapped holes in light mechanical assemblies
• Flat head profile allows the screw to sit flush with or below the mating surface when countersunk
• Phillips drive accepts standard No. 1 Phillips bits for quick installation
• Grade 2 steel construction provides adequate tensile strength for light-duty fastening applications
• Zinc-plated finish offers basic corrosion resistance in indoor and enclosed environments
• Sold in a box of 100 to support production, service, and maintenance workflows

Compatibility

Designed as a standard 4-40 UNC machine screw suitable for any application requiring a flat head Phillips fastener with a 0.25-inch overall length in a 4-40 tapped hole.

Installation Notes

Install using a No. 1 Phillips screwdriver or a compatible powered driver with a clutch set to avoid stripping the drive or overdriving the fastener. When countersinking into sheet metal or plastic, verify that the countersink angle matches the flat head geometry before installation. De-energize any electrical equipment before fastening or removing hardware inside live panels or enclosures. Follow applicable NEC or equipment manufacturer guidelines when securing components inside electrical enclosures.