Value Collection MSFI0-400370-100BX 4-40 Flat Head Slotted Screw

Product Description

The VALUE COLLECTION MSFI0-400370-100BX is a 4-40 x 3/8-inch flat head slotted machine screw designed for general fastening applications across mechanical, electrical, and light fabrication work. The screw is manufactured from Grade 2 steel with a zinc-plated finish that provides basic corrosion resistance in indoor and light-duty environments. The flat head profile sits flush with the mating surface when countersunk correctly, making it suitable for assemblies where a smooth, snag-free surface is required. Each box contains 100 screws. This item ships in a package quantity of 1 box.

This screw is used in residential and commercial maintenance, panel assembly, electrical enclosure work, and light equipment fabrication. The 4-40 Unified National Coarse thread is one of the most common small-fastener thread standards in North American manufacturing and service applications. Typical installations include securing terminal blocks, small brackets, covers, and control panel components. The slotted drive accepts a standard flat-blade screwdriver, which is common in field service environments. The overall length and length under head are both 3/8 inch, indicating no shoulder — threads run the full fastener body.

Key Features

• 4-40 UNC thread — standard Unified National Coarse thread for broad compatibility with tapped holes and nuts in North American applications
• Flat head profile — sits flush when installed in a countersunk hole, reducing surface protrusion
• Slotted drive — accepts standard flat-blade screwdrivers; no specialty bits required
• Grade 2 steel construction — suitable for general-purpose, non-structural fastening
• Zinc-plated finish — provides basic corrosion resistance for indoor and controlled-environment use
• Box of 100 — bulk quantity suitable for service stock and repetitive assembly tasks

Compatibility

Designed as a general-purpose replacement or service-stock fastener for any application requiring a 4-40 UNC flat head slotted machine screw with a 3/8-inch overall length.

Installation Notes

Installation is performed with a flat-blade screwdriver sized to match the screw slot. For flush seating of the flat head, the receiving material must be properly countersunk to the correct angle and diameter before driving. Do not overtighten small-diameter machine screws into tapped holes, as Grade 2 fasteners have limited tensile strength and thread stripping can occur. For electrical enclosure or panel applications, follow applicable NEC guidelines for fastener use and torque requirements.