Value Collection MPFI0-400870-100BX 4-40 Flat Head Screw

Product Description

The VALUE COLLECTION MPFI0-400870-100BX is a 4-40 x 7/8-inch flat head Phillips machine screw manufactured from Grade 2 steel with a zinc-plated finish. Designed to sit flush with or below the surface of a mating part, the flat head profile is suited for countersunk holes where a low-profile fastening point is required. The zinc plating provides a baseline level of corrosion resistance for general indoor and light-duty applications. This screw uses Unified National Coarse (UNC) threading and is measured at overall length, with no washer included. Installers across electrical, HVAC, and light mechanical trades use this fastener for panel assembly, equipment housing, and fixture mounting.

This fastener is appropriate for light-duty mechanical assemblies, electrical enclosures, control panels, and equipment housings where a flush-mount screw is needed. The 4-40 thread size is common in small-device and instrument applications. The Phillips drive type is compatible with standard Phillips screwdrivers and bits. This screw is sold in a minimum order quantity of 100 units per order, with one package per order unit.

Key Features

• 4-40 UNC threading for use in standard tapped holes requiring a number 4 machine screw
• Flat head profile designed for countersunk holes to achieve a flush or sub-flush finish
• Phillips drive for use with common Phillips screwdrivers or power driver bits
• Grade 2 steel construction provides adequate tensile strength for light-duty fastening applications
• Zinc-plated finish offers basic corrosion resistance for indoor and controlled environments
• No washer included; overall length of 7/8 inches equals length under head

Compatibility

Designed as a standard 4-40 UNC flat head Phillips machine screw suitable for use in any application requiring a number 4-40 countersunk machine screw with an overall length of 7/8 inches.

Installation Notes

Installation is performed by hand or with a standard Phillips screwdriver or power driver fitted with the appropriate bit. Ensure the receiving hole is properly tapped to 4-40 UNC before driving the screw to avoid thread stripping. Do not overtorque; Grade 2 steel has lower tensile strength than higher-grade fasteners and is not rated for high-stress structural applications. Power down any electrical equipment before accessing enclosures or panels where fasteners are being replaced.