304 Stainless Steel Flat Head Threaded Rivet Nut Kit 5/16-18 UNC for Sheet Metal Fastening

When you need to create a strong threaded anchor in thin sheet metal, plastic panels, or composite materials, standard tapping often fails. These 304 stainless steel flat head rivet nuts offer a practical solution: they insert into a pre-drilled hole and lock into place with a pulling tool, forming permanent threads in materials too thin for normal tapping. With a 5/16-18 UNC thread size, they work with widely available bolts and screws, making them ideal for automotive repairs, DIY fabrication, and industrial assembly. The corrosion-resistant 304 stainless steel construction ensures long-lasting performance even in damp or outdoor conditions. This kit gives you either 20 or 40 pieces, letting you choose the right quantity for your project.

Features and Construction

These rivet nuts are built to deliver reliable thread holding in thin materials. Their flat head profile sits flush after installation, avoiding protrusions that could snag or interfere.

Material and Build

Each rivet nut is formed from 304 stainless steel, a grade known for good corrosion resistance and strength. The construction provides a solid threaded insert without requiring access to the back side of the panel, which simplifies installation in tight spaces.

Size and Practical Fit

The body diameter is 0.4 inches, matching the recommended drilling size of 0.4 inches. Head diameter measures 1.5cm with a head height of just 0.07cm, allowing the nut to sit nearly flush. Total length is 0.75 inches (about 1.8cm), and the grip range is 0.00 to 0.10 inches (about 0.1 to 0.3cm), suitable for thin-gauge materials.

Uses and Placement

These rivet nuts are designed for fastening into materials without sufficient thickness for tapping threads. They are particularly useful in automotive, HVAC, and general sheet metal work.

Event or Professional Use

Automotive technicians and fabricators use these inserts for mounting brackets, trim panels, and components in vehicles. The 5/16-18 UNC thread matches common hardware, allowing quick bolt installation.

Everyday Home Use

DIY enthusiasts can use these rivet nuts in home projects such as installing shelves, workbench fixtures, or repair tasks involving thin metal or plastic. The flat head keeps surfaces smooth and tidy.

Benefits and Buying Value

These rivet nuts provide a permanent threaded anchor where tapping is not possible, reducing the need for special adaptors or welding. Their corrosion resistance extends usefulness in challenging environments.

Reuse and Low Maintenance

Once installed, these inserts remain in place and can be unbolted and rebolted multiple times without losing thread integrity. The stainless steel material does not rust easily, reducing maintenance needs.

Why Choose This Product

This kit offers a standardised 5/16-18 UNC thread size, precise dimensions for clean installation, and a choice of 20 or 40 pieces. The flat head profile and flush fit make it suitable for applications requiring a smooth finish.