Value Collection 3RSMSF04C004 Machine Screw 4-40

Product Description

The VALUE COLLECTION 3RSMSF04C004 is a 4-40 x 0.25 inch flat head slotted machine screw manufactured from brass. It meets ASME B18.6.3 dimensional standards and is sold in a minimum order quantity of 100 pieces. The flat head profile sits flush with or below the mating surface, making it well suited for applications where a low-profile or countersunk finish is required. Brass construction provides corrosion resistance and is non-magnetic, which matters in electrical enclosures and instrumentation work. The slotted drive accepts a standard flat-blade screwdriver and is common in legacy hardware and panel assembly applications.

This screw is used across a wide range of light-duty fastening tasks in electrical panels, HVAC controls, instrumentation housings, plumbing fixture trim, and general sheet metal or plastic assembly work. The 4-40 thread is a fine-pitch unified coarse thread commonly found in small control boards, terminal strips, and enclosure covers in both residential and commercial trade applications. Installers in electrical and HVAC fields routinely stock this size for cover plates, grounding lugs, and small component mounting.

Key Features

• 4-40 unified thread form for broad fastener compatibility in small assemblies
• Flat head design sits flush or below surface when used with a countersunk hole
• Slotted drive accepts standard flat-blade screwdrivers — no specialty tooling required
• Brass material is corrosion resistant and non-magnetic
• Conforms to ASME B18.6.3 dimensional standards
• Overall length and length under head are both 0.25 inches — no shank relief

Compatibility

Designed as a standard ASME B18.6.3 inch-series flat head slotted machine screw for use in any application requiring a 4-40 thread and a 0.25 inch overall length in brass.

Installation Notes

Use a properly sized flat-blade screwdriver matched to the slot width to avoid cam-out and slot damage, especially in brass which is softer than steel. For countersunk installations, verify the mating hole is machined or punched to the correct angle before driving. Brass screws should be tightened by feel — overtorquing can strip threads or shear the head. No special tools or trade licensing are required for installation, but proper torque practices apply in any panel or enclosure work subject to NEC guidelines.