Value Collection MSCI0-401000-100BX 4-40 X 1 in Fillister Screw

Product Description

The VALUE COLLECTION MSCI0-401000-100BX is a 4-40 UNC machine screw with a fillister head and slotted drive, manufactured from Grade 2 steel with a zinc-plated finish. It measures 1 inch in length, measured from under the head, and is supplied without a washer. The zinc plating provides basic corrosion resistance for general indoor and light-duty applications. This fastener is suited for electricians, HVAC technicians, and mechanical assemblers who need a reliable small-diameter machine screw for panel work, equipment housings, and light mechanical assemblies.

This 4-40 x 1 inch fillister head screw is commonly used in control panel assembly, electrical enclosures, instrumentation housings, and light sheet metal or plastic component fastening. The fillister head profile offers a taller head height than a standard pan head, providing more engagement for slotted drivers in confined spaces. It is an inch-system fastener conforming to UNC thread standards and is appropriate for residential and commercial trade applications where a small-diameter threaded fastener is required.

Key Features

• 4-40 UNC thread size for compatibility with standard inch-system tapped holes
• Fillister head with slotted drive for use in tight or recessed fastening locations
• Grade 2 steel construction provides adequate strength for light-duty mechanical assembly
• Zinc-plated finish for basic corrosion resistance in indoor environments
• Length measured under head at 1 inch for consistent assembly depth control
• Supplied without washer for straightforward drop-in replacement or new installation

Compatibility

Designed as a standard UNC inch-system machine screw suitable for any application requiring a 4-40 threaded fastener with a fillister head profile.

Installation Notes

Installation is performed by hand-driving with a standard flat-head screwdriver sized for the slotted recess. Ensure the mating tapped hole or nut is clean and free of debris before driving. De-energize all electrical equipment before fastening hardware inside live panels or enclosures. Do not overtighten, as Grade 2 steel at 4-40 diameter has limited torque capacity and thread stripping can occur with power tools.