Value Collection 0404MSR 4-40 X 1/4 in Round Head Slotted Machine

Product Description

The VALUE COLLECTION 0404MSR is a 4-40 unified coarse thread machine screw designed for light-duty mechanical fastening applications. The round head profile and slotted drive accept a flat-blade screwdriver, making it a straightforward choice for assemblies where a low-profile head and simple tooling are standard. The screw is manufactured from steel with a zinc finish applied for basic corrosion resistance. It conforms to ASME B18.6.3 and SAE J82 standards, which govern dimensional tolerances, head geometry, and mechanical properties for inch-series machine screws. Machinists, electricians, and equipment technicians commonly use this fastener in panel work, electronic enclosures, and light mechanical assemblies.

This screw is suited for use in residential and commercial applications wherever a 4-40 thread pattern is called out in the design. Common install scenarios include securing terminal strips, sub-panels, small gear covers, and electrical component brackets. The 0.25-inch length under head is appropriate for thin stock and sheet metal assemblies. It ships in a package quantity of one unit, with a minimum order quantity of 100 pieces, making it practical to purchase in job-lot quantities for service vans or shop inventory.

Key Features

• 4-40 UNC thread size for compatibility with standard 4-40 tapped holes and nuts
• Round head profile provides a domed appearance and broad bearing surface on thin materials
• Slotted drive accepts standard flat-blade screwdrivers and bits
• Steel construction with zinc finish for basic corrosion resistance in indoor environments
• Conforms to ASME B18.6.3 and SAE J82 dimensional and mechanical standards
• No washer included; washer style is without washer

Compatibility

Designed as a standard inch-series machine screw for use in any application requiring a 4-40 UNC thread with a 0.25-inch length under head, round head, and slotted drive.

Installation Notes

Installation is performed by hand or with a flat-blade screwdriver or power driver fitted with a slotted bit. Ensure the mating tapped hole or nut is clean and free of debris before driving. Do not overtighten; 4-40 screws are small-diameter fasteners and are susceptible to thread stripping if excessive torque is applied. Follow applicable assembly specifications for the equipment being serviced.