Value Collection 0406MST 4-40 Truss Head Slotted Machine Screw

Product Description

The VALUE COLLECTION 0406MST is a 4-40 unified coarse thread machine screw with a truss head and slotted drive. Made from steel with a zinc finish, it meets ASME B18.6.3 and SAE J82 standards. The truss head profile features a wide, low-diameter head that distributes clamping load across a broader surface area than a standard pan or round head. With a 3/8-inch length measured under the head, this screw suits applications requiring a short, precise fastener in light-gauge assemblies. It ships in a minimum order quantity of 100 pieces per package.

This screw is used in light mechanical and electrical enclosure assembly, control panel fabrication, and small-device hardware applications. The 4-40 thread size is common in instrumentation, electronics housings, HVAC control boards, and low-voltage electrical equipment. The truss head profile makes it well suited for thin sheet metal and plastic panel work where head pull-through resistance is a consideration. Installation is typically performed by sheet metal technicians, electrical assemblers, or service technicians during control component replacement.

Key Features

• 4-40 unified coarse thread for standard light-duty fastening in instrumentation and panel work
• Truss head profile provides a wide, low-profile bearing surface to reduce pull-through in thin materials
• Slotted drive compatible with standard flat-blade screwdrivers
• Steel construction with zinc finish for corrosion resistance in indoor applications
• Meets ASME B18.6.3 and SAE J82 dimensional and material standards
• Sold in multiples of 100 pieces, suitable for service stock or production use

Compatibility

Designed as a standard 4-40 machine screw replacement suitable for light mechanical assemblies, electrical enclosures, control panels, and instrumentation hardware that accept a truss head slotted fastener with 3/8-inch length under head.

Installation Notes

Installation requires a flat-blade screwdriver sized to the slotted head. De-energize all electrical equipment before replacing fasteners in control panels or enclosures. Avoid over-torquing into plastic or thin sheet metal substrates, as the slotted drive is susceptible to cam-out under high torque. Ensure the mating thread is clean and free of debris before installation.