Value Collection R52000307 4-40 X 3/8 in Round Head Screw

Product Description

The VALUE COLLECTION R52000307 is a 4-40 x 3/8 inch round head slotted machine screw manufactured from brass. Designed for precision fastening in electrical, HVAC, plumbing, and general trade applications, this screw features a slotted drive that accepts a standard flat-blade screwdriver. The 4-40 thread designation indicates a No. 4 screw with 40 threads per inch, suitable for light-duty fastening into tapped holes or with mating nuts. Brass construction provides corrosion resistance and electrical conductivity, making it well suited for panel work, terminal assemblies, and moisture-prone environments. This item meets ASME B18.16.3 dimensional standards and is sold in a minimum quantity of 100 pieces per order.

This screw is commonly used by electricians, HVAC technicians, and plumbers when securing small components such as terminal blocks, control board standoffs, cover plates, and instrument panels. The 3/8 inch under-head length suits shallow through-hole and tapped-boss applications in both residential and light commercial equipment. The round head profile provides a low-profile bearing surface without requiring a countersunk hole.

Key Features

• 4-40 thread size with 40 threads per inch for fine-pitch fastening
• 3/8 inch length measured under the head per ASME B18.16.3
• Round head profile eliminates need for countersunk or flat-bottom holes
• Slotted drive accepts standard flat-blade screwdrivers
• Brass material offers corrosion resistance and electrical conductivity
• Meets ASME B18.16.3 dimensional standard for inch-series machine screws

Compatibility

Designed as a standard 4-40 inch-series machine screw for use wherever a round head slotted brass fastener of this thread size and length is specified. Consult equipment service documentation to confirm thread size, length, and material requirements before installation.

Installation Notes

Install using a flat-blade screwdriver sized to fit the slotted head to avoid cam-out and head damage. De-energize all circuits and follow applicable NEC or equipment-specific lockout procedures before replacing fasteners in electrical enclosures or control panels. Avoid over-torquing brass screws into tapped holes, as brass is softer than steel and susceptible to thread stripping. Verify thread engagement depth is sufficient in the mating component before final tightening.