Value Collection 0420MSL 4-40 Fillister Head Slotted Machine Screw

Product Description

The Value Collection 0420MSL is a 4-40 unified coarse thread machine screw with a fillister head and slotted drive, manufactured from steel with a zinc finish. It measures 1-1/4 inches in length under head and conforms to ASME B18.6.3 and SAE J82 standards. The fillister head profile features a small, high-crowned head with a deep slot, making it well suited for applications where a recessed or close-clearance head is needed. The zinc finish provides basic corrosion resistance. This screw is sold individually but carries a minimum order quantity of 100 pieces, making it appropriate for shop stock or production use by maintenance technicians, electricians, and mechanical assemblers.

The 0420MSL is used in light-duty mechanical assemblies, electrical enclosures, panels, and control boxes where a 4-40 threaded fastener with a slotted fillister head is specified. The small diameter and fine thread pitch make it common in instrument panels, electronic enclosures, and precision assemblies requiring a clean, low-profile head without a washer. Installation is handled by general maintenance trades, electricians, and assembly technicians in both residential and commercial settings.

Key Features

• 4-40 unified coarse thread for use with standard 4-40 tapped holes or nuts
• Fillister head with deep slotted drive for reliable engagement in tight spaces
• 1-1/4 inches length under head as measured per ASME B18.6.3
• Steel construction with zinc finish for basic corrosion protection
• Manufactured to SAE J82 material grade for consistent mechanical properties
• No washer face — ships without integrated washer

Compatibility

Designed as a standard inch-series machine screw for any application specifying a 4-40 x 1-1/4 inch fillister head slotted fastener per ASME B18.6.3.

Installation Notes

Install using a flat-blade screwdriver sized to the slot width to avoid cam-out and head damage. Ensure the mating hole or nut is tapped to 4-40 specifications before driving the screw. Do not over-torque small-diameter machine screws, as the threads and head slot can strip easily. De-energize any electrical panel or enclosure before fastener work in live equipment.