Value Collection 0403MSL 4-40 Fillister Head Slotted Machine Screw

Product Description

The VALUE COLLECTION 0403MSL is a 4-40 unified coarse-thread machine screw designed for light-duty mechanical fastening in electrical enclosures, instrument panels, and precision assemblies. It features a fillister head profile with a slotted drive, manufactured from steel with a zinc finish for basic corrosion resistance. The thread size follows the inch measurement system with a 3/16-inch length measured under the head. This screw conforms to ASME B18.6.3 and SAE J82 standards, making it a reliable choice for assemblies that require a dimensionally consistent, specification-grade fastener. Electricians, HVAC technicians, and light industrial mechanics commonly use this style when reassembling control panels or securing small components.

This fastener suits residential and commercial applications where a low-profile, tight-tolerance screw is needed. The fillister head sits slightly raised with a smaller diameter than a pan head, allowing it to seat cleanly in counterbored or close-clearance holes. It is well-suited for control board enclosures, junction box covers, instrumentation housings, and similar assemblies. The slotted drive is compatible with standard flat-blade screwdrivers. Sold as a single piece with a minimum order quantity of 100 units.

Key Features

• 4-40 unified coarse thread for consistent engagement in tapped holes
• Fillister head profile fits counterbored holes and tight-clearance applications
• Slotted drive compatible with standard flat-blade screwdrivers
• Steel construction with zinc finish for basic corrosion resistance
• Conforms to ASME B18.6.3 and SAE J82 fastener standards
• Inch measurement system, length measured under head

Compatibility

Designed as a standard inch-series machine screw for use in any application requiring a 4-40 thread with a fillister head profile and slotted drive. No washer is included or required by design.

Installation Notes

Always power down and de-energize any electrical assembly before replacing or installing fasteners in control enclosures or panel boxes, following applicable NEC guidelines. Use a properly sized flat-blade screwdriver to avoid stripping the slotted drive. Do not over-torque small-diameter machine screws into tapped holes, as the 4-40 thread is susceptible to cross-threading and stripping in softer base materials. Verify thread engagement depth matches the tapped hole before applying load.