Value Collection MSPI0-400250-100BX Machine Screw 4-40

Product Description

The VALUE COLLECTION MSPI0-400250-100BX is a 4-40 UNC machine screw designed for light-duty fastening in metal, plastic, and composite assemblies. The pan head profile provides a low-profile bearing surface with a wide, flat underside that distributes clamping load evenly across the mating material. The slotted drive accepts a standard flat-blade screwdriver, making it compatible with both manual and power installation in high-volume assembly and service work. Constructed from Grade 2 steel with a zinc-plated finish, this screw resists light corrosion and meets standard dimensional tolerances for 4-40 UNC thread systems. Sold in boxes of 100 units, this fastener is well-suited for electrical panel work, equipment assembly, and general trade service applications.

This screw is used across electrical, HVAC, and light mechanical applications where a small-diameter, fine-pitch fastener is required. The 4-40 UNC thread size is common in control boards, terminal blocks, junction boxes, equipment enclosures, and instrumentation panels. At 0.25 inches in length under head, it is intended for thin-material applications where deeper thread engagement is not required. Electricians, HVAC technicians, and general mechanical tradespeople typically keep this size on hand for field service and repair work.

Key Features

• 4-40 UNC thread for compatibility with standard tapped holes in electrical and mechanical assemblies
• Pan head profile distributes clamping force and sits flush enough for most enclosure and panel applications
• Slotted drive works with standard flat-blade screwdrivers and bit drivers
• Grade 2 steel construction meets standard strength requirements for light-duty fastening
• Zinc-plated finish provides light corrosion resistance in typical indoor service environments
• Box quantity of 100 supports field stocking and assembly production runs

Compatibility

Designed as a standard 4-40 UNC machine screw for use in any application requiring a pan head slotted fastener with 0.25-inch length under head in inch-system hardware.

Installation Notes

Install using a flat-blade screwdriver or appropriately sized bit driver rated for slotted drive fasteners. Confirm the receiving tapped hole is 4-40 UNC before installation to avoid cross-threading or thread damage. Power down any electrical equipment fully before fastening or removing screws in live panels or control enclosures. Do not over-torque Grade 2 steel screws in thin sheet metal or plastic tapped holes, as thread stripping can occur.