Value Collection MPRI0-400500-050B Machine Screw 4-40

Product Description

The VALUE COLLECTION MPRI0-400500-050B is a 4-40 x 0.5-inch round head Phillips machine screw built for general-purpose fastening applications. Manufactured from Grade 2 steel with a zinc-plated finish, this UNC-thread fastener delivers reliable corrosion resistance in light-duty indoor and controlled-environment settings. The round head profile provides a low-profile, finished appearance with broad bearing surface contact. Measurement is taken under the head. This screw is sold in a minimum order quantity of 50 pieces per package, making it suitable for shop stock, maintenance inventory, or production-line use.

This fastener is used across a wide range of trade and light industrial applications including electrical panel assembly, equipment enclosure fabrication, control box assembly, and general mechanical maintenance. The 4-40 thread size is a common standard in instrument-grade and light-mechanical assemblies. The Phillips drive is compatible with standard and powered screwdrivers for fast installation. No washer is included or required by design.

Key Features

• 4-40 UNC thread for compatibility with standard 4-40 tapped holes and nuts
• Round head with Phillips drive for broad bearing surface and easy installation
• Grade 2 steel construction for reliable strength in light-duty applications
• Zinc-plated finish for basic corrosion resistance in dry or controlled environments
• Length measured under head at 0.5 inches
• Sold in packs of 50 for shop stock and production use

Compatibility

Designed as a standard 4-40 UNC machine screw suitable for use with 4-40 threaded holes, inserts, and nuts in electrical enclosures, instrumentation panels, and light mechanical assemblies.

Installation Notes

Installation is performed by electricians, mechanics, or maintenance technicians using a Phillips-head screwdriver or compatible power driver bit. Ensure the receiving hole is properly tapped to 4-40 UNC before driving the screw to avoid thread damage. Do not overtighten, as Grade 2 fasteners are not rated for high-torque applications. Follow applicable equipment manufacturer guidelines for fastener torque requirements.