Value Collection 3RSMSF04C008 4-40 X 1/2 in Flat Head Screw

Product Description

The VALUE COLLECTION 3RSMSF04C008 is a 4-40 x 1/2 inch flat head slotted machine screw manufactured from brass. It conforms to ASME B18.6.3, the standard governing the dimensions and tolerances of slotted flat head machine screws in the inch measurement system. The flat head profile sits flush with or below the surface of the mating material, making this screw well suited for applications where a smooth, unobtrusive finish is required. Brass construction offers good corrosion resistance and electrical conductivity, properties that make this fastener a common choice in electrical assemblies, instrumentation panels, and light mechanical components. Thread size is 4-40 with an overall length of 1/2 inch.

This screw is used across a wide range of light-duty fastening applications in electrical, HVAC controls, instrumentation, and general mechanical assembly work. The slotted drive accepts a standard flat-blade screwdriver, which remains a practical choice in confined spaces or when using hand tools. The brass material is compatible with non-ferrous assemblies and environments where steel fasteners may cause galvanic corrosion concerns. This item is sold in minimum order quantities of 100 pieces per order.

Key Features

• 4-40 unified coarse thread for standard inch-series tapped holes
• Flat head profile allows flush or countersunk installation
• Slotted drive compatible with standard flat-blade screwdrivers
• Brass material provides corrosion resistance and electrical conductivity
• Conforms to ASME B18.6.3 dimensional standard
• No washer — clean, low-profile seating against the work surface

Compatibility

Designed as a standard inch-series machine screw for use in any 4-40 tapped hole requiring a flush-mount flat head fastener, consistent with ASME B18.6.3 specifications.

Installation Notes

Installation is performed with a flat-blade screwdriver sized to the slot width of the screw head. A correctly sized driver prevents cam-out and protects the soft brass head from damage. Countersink the mating material to the appropriate angle before driving to achieve a true flush finish. Do not exceed hand-tight torque levels typical for brass fasteners at this thread size, as brass is softer than steel and the threads can strip if overtightened.