Value Collection MPFI0-400370-100BX 4-40 Flat Head Screw

Product Description

The VALUE COLLECTION MPFI0-400370-100BX is a 4-40 x 3/8 inch flat head Phillips machine screw designed for general-purpose fastening in metal and plastic assemblies. Built from Grade 2 steel with a zinc plating finish, this screw offers basic corrosion resistance suitable for indoor and light-duty applications. The flat head profile sits flush with or below the mating surface when installed in a countersunk hole, keeping the assembly low-profile. The Phillips drive is compatible with standard screwdrivers and power drivers. These screws are sold in a box quantity of 100 units, making them practical for production assembly, maintenance stock, or field kit replenishment.

This screw is suited for light mechanical assemblies, electronics enclosures, panel mounting, and equipment maintenance tasks where a 4-40 UNC thread and flush-mount fastener are specified. The 3/8 inch overall length is measured end-to-end, with the full 3/8 inch also serving as the length under head, confirming the flat-head geometry. Typical users include electricians, HVAC technicians, and general maintenance professionals who need small-diameter machine screws for control board brackets, access panels, and enclosure hardware.

Key Features

• 4-40 UNC thread for compatibility with standard tapped holes in that size
• Flat head profile allows flush or countersunk installation
• Phillips drive works with common screwdrivers and bit drivers
• Grade 2 steel construction provides adequate strength for light-duty fastening
• Zinc plating adds basic corrosion resistance for indoor use
• Sold in a 100-piece box quantity for bench stock and production use

Compatibility

Designed as a standard 4-40 UNC flat head Phillips machine screw for use in any application requiring that thread size and head style in inch-system assemblies.

Installation Notes

Installation is performed by hand or with a Phillips screwdriver or bit driver. Ensure the mating component has a properly tapped 4-40 UNC hole or a matching threaded insert before driving the screw. For flush seating, the receiving surface should be countersunk to match the flat head angle. Do not overtighten; Grade 2 fasteners have lower proof load ratings than higher-grade hardware.