Value Collection MSCI0-400310-100BX 4-40 Machine Screw

Product Description

The VALUE COLLECTION MSCI0-400310-100BX is a 4-40 x 5/16 inch fillister head machine screw designed for general fastening applications requiring a compact, low-profile head with a reliable slotted drive. Manufactured from Grade 2 steel with a zinc-plated finish, this screw provides basic corrosion resistance in indoor and light-duty service environments. The fillister head sits higher than a pan head and features a deep slot, making it well suited for applications where the driver needs positive engagement in tight clearances. These screws follow UNC thread standards and are sold in a minimum order quantity of 100 pieces per box.

These machine screws are used across a broad range of mechanical assembly tasks including electrical enclosures, control panels, HVAC equipment covers, and light sheet metal or plastic chassis work. The 4-40 thread size is a common specification in instrumentation, light electrical hardware, and equipment access panels. The zinc plating suits dry or minimally humid indoor environments. Installers in electrical, HVAC, and general mechanical trades will find this screw appropriate for securing lightweight components where a slotted driver is the correct tool.

Key Features

• Fillister head profile provides a deep slotted recess for positive driver engagement in confined spaces
• 4-40 UNC thread form ensures compatibility with standard tapped holes and nuts in that size
• Grade 2 steel construction meets requirements for general-purpose mechanical fastening
• Zinc-plated finish adds basic corrosion resistance for indoor service environments
• 5/16 inch length measured under the head suits thin-stock and light-gauge assembly work
• Sold in 100-piece increments for job-site and shop convenience

Compatibility

Designed as a general-purpose UNC machine screw for use in any application requiring a 4-40 threaded fastener with a fillister head and slotted drive in standard inch-measurement systems.

Installation Notes

Install using a flat-blade screwdriver sized to match the slot to avoid cam-out or head damage. Confirm the mating tapped hole or nut is rated for 4-40 UNC before driving the screw. Do not over-torque into plastic or thin sheet stock, as Grade 2 steel will strip soft base materials before the fastener fails. Power down any electrical equipment before replacing fasteners on enclosures or control panels per applicable NEC guidelines.