Value Collection R83924443 4-40 Machine Screw Round Head

Product Description

The VALUE COLLECTION R83924443 is a 4-40 UNC machine screw designed for precision fastening in light-duty mechanical, electrical, and instrumentation assemblies. It features a round head profile with a slotted drive and is manufactured from grade 18-8 stainless steel with a bright, uncoated finish. The 0.25-inch length is measured under the head. These screws are used wherever corrosion resistance and consistent thread engagement are required in compact fastener applications. Licensed tradespeople and maintenance technicians rely on this fastener type for panel assembly, junction box hardware, and equipment enclosure work.

This screw is suited for residential and commercial applications where small-diameter, fine-thread fasteners are required. Common install scenarios include securing terminal blocks, control board mounting, enclosure panels, and instrumentation hardware. The 4-40 UNC thread designation is a standard size widely used across HVAC controls, electrical enclosures, and light mechanical assemblies. Sold in minimum order quantities of 100 pieces per order.

Key Features

• 4-40 UNC thread size for precision engagement in standard tapped holes
• Round head profile with slotted drive for common flat-head screwdriver installation
• Grade 18-8 stainless steel construction for corrosion resistance
• Bright, uncoated finish with no washer
• 0.25-inch length under head for compact fastening applications
• Inch measurement system, UNC thread standard

Compatibility

Designed as a standard 4-40 UNC replacement or maintenance fastener for use in electrical enclosures, control panels, instrumentation housings, and similar light mechanical assemblies that require a round head slotted machine screw.

Installation Notes

Installation is typically performed by electricians, HVAC technicians, or mechanical maintenance personnel. Always de-energize equipment and follow applicable NEC or equipment manufacturer lockout/tagout procedures before fastener work on live panels or enclosures. Use a flat-head screwdriver sized to the slotted drive to avoid cam-out and slot damage. Do not overtighten into threaded inserts or thin sheet metal to prevent thread stripping.