Value Collection MSPI0-401250-100B 4-40 Pan Head Slotted Screw

Product Description

The VALUE COLLECTION MSPI0-401250-100B is a 4-40 x 1.25-inch pan head machine screw with a slotted drive, manufactured from steel with a zinc-plated finish. It conforms to ASME B18.6.3 and SAE J82 standards, ensuring dimensional accuracy and consistent performance. The pan head profile provides a low-profile bearing surface with a wide underside bearing area. The slotted drive is compatible with standard flat-blade screwdrivers. These screws are sold in minimum quantities of 100 per order and are suited for light-duty mechanical assemblies requiring a corrosion-resistant, standardized fastener.

These machine screws are used in a wide range of light mechanical and electrical assembly applications. Common installation environments include HVAC control panels, electrical enclosures, junction boxes, sheet metal assemblies, and general equipment maintenance tasks. The 4-40 thread size is a fine-pitch unified thread commonly found in instrumentation, small appliances, and low-voltage control wiring enclosures. Technicians in HVAC, electrical, and plumbing trades frequently keep 4-40 hardware on hand for panel and bracket fastening during service calls.

Key Features

• 4-40 unified thread size for compatibility with standard tapped holes in light mechanical assemblies
• 1.25-inch length measured under head for accurate fit in stacked or layered materials
• Pan head profile distributes clamping load across a broad bearing surface
• Slotted drive accepts standard flat-blade screwdrivers for quick installation
• Zinc-plated steel finish provides corrosion resistance in dry indoor environments
• Meets ASME B18.6.3 and SAE J82 dimensional and material standards

Compatibility

Designed as a standard 4-40 machine screw for use in any application requiring ASME B18.6.3 compliant slotted pan head fasteners in the inch measurement system.

Installation Notes

Installation is performed by hand or with a standard flat-blade screwdriver sized to the slotted head. Always ensure the mating threaded hole or nut is properly tapped to 4-40 specification before driving the fastener to avoid thread stripping. Power down any electrical equipment or control panel before fastening hardware in live enclosures, in accordance with NEC lockout and tagout procedures. Do not overtighten in thin sheet metal applications where thread engagement may be limited.