M2 Outer Diameter 3.8 and 4.0 Copper Nut Hot Melt Nut Brass Metric Threaded Insert

Hot melt copper nuts provide a practical solution for adding strong, reusable threads to plastic components during manufacturing. These brass threaded inserts are designed for heat or ultrasonic insertion into thermoplastic materials, creating a secure anchor point for screws. Following the Metric GB national standard, each nut offers consistent dimensions and reliable performance in electronic enclosures, automotive parts, and consumer goods assembly. The range includes M2 and M3 thread sizes with outer diameters of 3.8mm, 4.0mm, and 4.2mm, and heights from 3.0mm to 6.0mm, allowing you to match the insert to your specific design requirements. Supplied in convenient pack quantities per style, these nuts are a straightforward choice for production environments where threaded fastening in plastic is needed.

Features and Construction

These hot melt nuts are constructed from brass with an untreated surface, providing natural corrosion resistance and good electrical conductivity. The Metric GB standard ensures that thread dimensions and outer diameters are accurate and repeatable. Each style is clearly defined by thread size, outer diameter, and height, making selection simple.

Material and Build

The nuts are made from brass, a material chosen for its combination of strength, corrosion resistance, and workability. The surface is left untreated, which is typical for hot melt inserts where the bond with the plastic relies on the metal surface texture rather than coatings. This construction supports reliable insertion and long-term thread retention.

Size and Practical Fit

Thread sizes M2 and M3 cover common small fastener requirements. Outer diameters of 3.8mm, 4.0mm, and 4.2mm correspond to standard hole sizes in plastic mouldings. Heights from 3.0mm to 6.0mm provide options for different wall thicknesses and pull-out strength needs. Select the combination that matches your component design.

Uses and Placement

Hot melt nuts are widely used in electronics, automotive interiors, appliances, and plastic enclosures where a screw thread must be added after moulding. They are inserted using heat or ultrasonic energy, melting the surrounding plastic to lock the nut in place. This process is fast and repeatable in production.

Event or Professional Use

In professional manufacturing and repair settings, these nuts allow quick addition of threaded points without redesigning moulds. They are ideal for prototyping, jig building, and low-to-medium volume production runs where moulded threads are not practical.

Everyday Home Use

For DIY enthusiasts and hobbyists working with 3D-printed parts or plastic repairs, these nuts offer a way to add durable threads to plastic components. They work well with heat-set insertion tools and can be used in custom electronics projects, model making, and home appliance repairs.

Benefits and Buying Value

Using hot melt nuts reduces the need for self-tapping screws in plastic, which can strip over repeated use. These inserts provide a metal thread that remains intact through multiple assembly cycles, improving product longevity and serviceability. The availability of multiple sizes in one range simplifies sourcing.

Reuse and Low Maintenance

Once installed, the brass thread allows screws to be removed and reinserted without damaging the plastic. This makes the product suitable for applications where disassembly for maintenance or upgrades is required. The untreated brass surface requires no special care during storage or use.

Why Choose This Product

These nuts follow the Metric GB national standard, so you can rely on dimensional accuracy. The choice of eight sizes covers common thread and height requirements in a single product range. Whether you need M2 nuts for compact electronics or M3 nuts for larger assemblies, this set provides a straightforward, source-supported solution.