Value Collection MPFI0-400310-100BX 4-40 Machine Screw 100pk

Product Description

The VALUE COLLECTION MPFI0-400310-100BX is a 4-40 UNC machine screw with a flat head and Phillips drive, sold in a box of 100. Made from Grade 2 steel with a zinc-plated finish, this fastener offers reliable corrosion resistance for light- to medium-duty assembly work. At 5/16 inches in overall length with no washer, it seats flush when countersunk into metal, plastic, or composite panels. Electricians, HVAC technicians, and panel assemblers commonly use 4-40 hardware when securing terminal blocks, cover plates, and small electrical enclosures. The zinc plating provides a protective barrier suitable for indoor environments where moisture exposure is minimal.

This screw is suited for residential and light commercial applications where 4-40 UNC thread engagement is required. Typical use cases include securing low-voltage control boards, equipment cover panels, switchbox hardware, and instrument enclosures. The flat head profile allows the fastener to sit flush or slightly below the surface when installed into a properly countersunk hole, keeping clearances tight in confined assemblies. The 100-count box format makes it practical for service vans and shop stock alike.

Key Features

• 4-40 UNC thread form for precise engagement with standard tapped holes
• Flat head with Phillips drive for flush or countersunk installation
• Grade 2 steel construction provides adequate tensile strength for light assembly
• Zinc-plated finish resists corrosion in typical indoor service environments
• 5/16 inch overall length with no washer for low-profile seating
• 100-piece box quantity supports bulk service and shop restocking needs

Compatibility

Designed for use in any application requiring a 4-40 UNC flat head Phillips machine screw at 5/16 inches in length, including electrical panel covers, control board mounting, and general light-duty mechanical assemblies.

Installation Notes

Installation is performed by hand or with a Phillips screwdriver; a power driver with adjustable torque is acceptable to avoid stripping the Grade 2 head. Ensure the mating hole is properly tapped to 4-40 UNC or fitted with a compatible threaded insert before driving the fastener. For flush seating, the receiving material should be countersunk to match the flat head angle. De-energize any electrical equipment before accessing panels or enclosures where these fasteners are being installed or removed.