Rivet Nut Assortment Kit M3-M8 — Reliable Fastening for Automotive & DIY Repairs
When thin sheet metal, plastic panels, or hollow sections leave you without a solid anchor point, stripped threads and loose fasteners become a constant frustration. Whether you're a weekend mechanic, a fabricator, or a hands-on homeowner, this M3-M8 rivet nut assortment kit gives you a ready-to-use selection of thread inserts that create strong, permanent threads in materials that can't be tapped conventionally.
The kit covers six metric thread sizes — M3, M4, M5, M6, M8 — with a nominal length of typically 17.7 mm and a pitch of 0.3 mm on the M3 size, scaling appropriately across the range. The flange diameter measures approximately 12.4 mm with a flange thickness of around 0.45 mm, providing a flush, low-profile seating surface on your workpiece.
Use these rivet nuts to mount brackets on car body panels, secure electronics enclosures, reinforce furniture joints, or add threaded anchors to aluminum extrusions — anywhere a bolt needs a reliable mate in thin or hollow material.
✅ Compatible with standard rivet nut tools and hand riveters; suitable for steel, aluminum, and plastic substrates in automotive, marine, HVAC, and general fabrication applications.
Key Features
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🔩 Multi-size assortment covering M3 through M8 thread diameters — one kit handles the most common metric fastening needs on the job or in the garage
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🚗 Engineered for automotive repair and body panel work where welding or tapping is impractical on thin sheet metal
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💪 Flanged collar design (approx. 12.4 mm diameter, 0.45 mm thick) distributes clamping load evenly and prevents pull-through under vibration
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⚙️ Works with standard rivet nut installation tools — no special equipment required beyond a basic hand or pneumatic riveter
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📦 Assortment format keeps your toolbox stocked for mixed-size jobs without ordering individual packs for each thread size
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🔧 Suitable for steel, aluminum, and rigid plastic panels — versatile enough for automotive, marine, HVAC, and DIY fabrication projects
Who Is This For
🚗 Automotive DIYers & Mechanics — Install bumper brackets, interior trim panels, and underbody shields without welding. Rivet nuts give you clean, removable threaded anchors in body panels and chassis sections.
🔧 Fabricators & Metalworkers — Add threaded inserts to aluminum extrusions, steel tubing, and sheet metal enclosures where tapping isn't possible due to material thickness or access constraints.
🏠 Home DIY Enthusiasts — Reinforce furniture, mount shelving brackets, or secure fixtures to hollow-section materials around the house with a professional-grade fastening solution.
🎁 Workshop Gift — A practical, ready-to-use assortment that makes a thoughtful gift for anyone who works with metal, cars, or hands-on projects.
Technical Specifications
| Thread Size Range |
M3 – M8 |
| Nominal Length |
Typically 17.7 mm (varies by size) |
| Thread Pitch (M3) |
0.3 mm |
| Flange Diameter |
Approx. 12.4 mm |
| Flange Thickness |
Approx. 0.45 mm |
| Thread Nominal Diameter |
M3 mm (see variant options for full range) |
| Compatible Tools |
Standard hand or pneumatic rivet nut tool |
Frequently Asked Questions
What thread sizes are included in this kit?
This assortment covers M3 through M8 metric thread sizes, giving you the most commonly needed sizes for automotive and general DIY fastening in a single kit.
Do I need a special tool to install these rivet nuts?
A standard rivet nut installation tool (hand or pneumatic) is required. Most generic rivet nut tools available at hardware stores are compatible with this size range.
What materials can these rivet nuts be installed into?
These rivet nuts are suitable for steel, aluminum, and rigid plastic panels — typically any material where you need a threaded insert and cannot access the back side for a conventional nut.
What is the minimum material thickness required?
Minimum grip thickness varies by size. Generally, rivet nuts in this range work with material thicknesses from approximately 0.5 mm up to 3–4 mm depending on the specific size. Contact us to confirm for your application.
Are these rivet nuts removable after installation?
Rivet nuts create a permanent threaded insert in the base material. The bolt or screw inserted into the rivet nut is removable, but the rivet nut itself is designed to remain fixed in the panel.
Can these be used for automotive body panel repairs?
Yes — rivet nuts are widely used in automotive repair for attaching brackets, trim panels, and accessories to thin sheet metal where welding or tapping is not practical.
How do I choose the right size for my project?
Match the rivet nut thread size to the bolt or screw you plan to use. For example, use an M6 rivet nut with an M6 bolt. The hole diameter you drill should match the rivet nut's body diameter — refer to the installation tool's sizing chart for exact drill sizes.
Ready to tackle your next repair or build? Add this rivet nut assortment to your cart and keep every thread size on hand — because the right fastener makes all the difference.
