Value Collection MSRI0-401500-100BX 4-40 Machine Screw 100pk

Product Description

The VALUE COLLECTION MSRI0-401500-100BX is a 4-40 UNC machine screw with a round head and slotted drive, packaged in a box of 100. Made from alloy steel with a zinc plating finish, this screw measures 1.5 inches in length under the head. The zinc coating provides corrosion resistance suitable for general indoor mechanical and electrical assemblies. These fasteners are commonly installed by electricians, HVAC technicians, panel fabricators, and industrial maintenance professionals who require consistent thread engagement and a low-profile round head seating flush against mating surfaces without a washer.

This screw is suited for light-duty fastening applications in control panels, electrical enclosures, HVAC equipment housings, and general sheet metal or machined-part assemblies. The 4-40 UNC thread is a standard size widely used in instrumentation, small appliance frames, and electronic component mounting. The slotted drive accommodates a standard flat-blade screwdriver, making installation straightforward in tight spaces where a Phillips or hex driver may not fit. The box quantity of 100 suits both service van restocking and bench-assembly operations.

Key Features

• 4-40 UNC thread for standard light-duty mechanical and electrical fastening
• 1.5-inch length under head for deeper thread engagement in thicker assemblies
• Round head profile distributes clamping load without a washer
• Slotted drive compatible with standard flat-blade screwdrivers
• Zinc-plated alloy steel construction for strength and basic corrosion resistance
• Box of 100 supports high-volume service and assembly work

Compatibility

Designed as a standard UNC 4-40 machine screw for use in any application requiring a 4-40 threaded fastener with a round slotted head and 1.5-inch length under the head.

Installation Notes

Install using a flat-blade screwdriver sized to the slot width to avoid cam-out and head damage. Ensure the mating hole is tapped or threaded to 4-40 UNC specification before driving. De-energize and lock out any electrical panel or equipment before fastening screws in live enclosures, per NFPA 70 (NEC) lockout-tagout procedures. Do not overtighten in thin sheet metal or plastic standoffs, as the alloy steel screw can strip or crack softer base materials.