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When engineers need to create reliable, reusable threaded connections in thin materials, hollow sections, or assemblies where only one side is accessible, rivet nuts deliver an elegant solution. Also known as blind nuts, threaded inserts, or nutserts, rivet nuts are one of the most versatile fastening technologies in modern industrial manufacturing.
Yet they remain under-specified and under-utilised, often because procurement teams and even design engineers are unfamiliar with the full range of rivet nut types, body configurations, and material options available.
This guide provides a complete technical overview of rivet nuts: what they are, how they work, what types are available, and how to select the right rivet nut for your application.
A rivet nut is a one-piece fastener typically made from steel, stainless steel, or aluminium that provides a permanent, load-bearing internal thread in a parent material where through-hole threading is not possible or practical.
The rivet nut is inserted into a pre-drilled hole from the accessible face (the front). An installation tool applies a pulling force to the threaded mandrel, causing the lower body of the rivet nut to deform (upset) behind the parent material. This creates a secure, load-bearing anchor without requiring access to the back of the panel.
The resulting threaded insert can accept standard metric or imperial fasteners and supports multiple assembly and disassembly cycles unlike a welded nut, which is permanent and subject to heat distortion.
The most common type, available with smooth or knurled bodies. Knurled versions resist rotation when torque is applied during bolt installation. Suitable for round holes in sheet metal, aluminium extrusions, and thin plate.
Hexagonal body provides positive anti-rotation locking in a corresponding hex hole. Used where high torque resistance is required and round-body rivet nuts may spin in the hole. Common in automotive and structural assembly.
Low-profile head sits flush against the panel surface after installation. Used where a flush or near-flush finish is required panel assemblies, aesthetic surfaces, and applications where head protrusion would interfere with mating parts.
Designed for countersunk holes, providing a fully flush installed profile. Used in aerospace-influenced applications and precision panel assemblies.
Large bearing area under the head distributes clamping load across a wider area, ideal for soft or low-strength substrates (thin aluminium, plastics, and composite panels) where a small flange would concentrate stress and risk pull-through.
Specifically designed for installation in very thin sheets (0.5mm - 1.5mm), where standard rivet nut body lengths would be excessive. Short body ensures correct deformation in minimal material thickness.
|
Material |
Properties |
Typical Applications |
|
Carbon Steel |
High strength, cost-effective |
General manufacturing, structural assemblies |
|
Stainless Steel (A2/A4) |
Corrosion-resistant, high-strength |
Solar, marine, food processing, outdoor |
|
Aluminium |
Lightweight, corrosion-resistant |
Aerospace, automotive, lightweight structures |
|
Brass |
Electrical conductivity, corrosion resistance |
Electronics, electrical enclosures |
|
Zinc Plated Steel |
Moderate corrosion resistance, economy |
General indoor manufacturing applications |
Rivet nuts require a dedicated installation tool to achieve correct deformation and joint performance. The installation tool grips the rivet nut mandrel, applies a controlled pulling force, and upsets the body behind the panel to the correct geometry.
Manual hand tools are suitable for low-volume assembly and maintenance. Pneumatic and battery-powered tools are used in production assembly for speed and repeatability. Hydraulic tools are specified for large-diameter or thick-wall rivet nuts requiring high installation force.
Using the correct, calibrated installation tool matched to the specific rivet nut type and size is critical to achieving the specified pull-out and torque resistance values. Avlock supplies rivet nut installation tools designed specifically for its products.
|
Feature |
Rivet Nut |
Weld Nut |
Self-Clinching Nut |
|
Installation method |
Tool, one-sided |
Welding, two-sided heat |
Press force, one-sided |
|
Parent material distortion |
Minimal |
Heat distortion risk |
Minimal (hard materials only) |
|
Applicable materials |
All metals, some composites |
Weldable metals only |
Sheet metal (hard) |
|
Reworkability |
Not removable (permanent) |
Not removable |
Not removable |
|
Post-treatment |
Compatible |
May affect coating |
Compatible |
|
Access requirement |
Front access only |
Full access + welding equipment |
Press access |
|
Best for |
Thin sheet, one-sided access |
Structural steel assemblies |
Precision sheet metal |
Automotive: Door panels, seat structures, dashboard assemblies, EV battery housings, and body-in-white aluminium structures. Creating threaded connections in thin aluminium extrusions and AHSS panels without welding.
Solar Energy: Aluminium racking frame assembly, panel mounting brackets, inverter enclosures, junction boxes. One-sided installation is essential in solar frame assembly, where back access is impossible.
Construction and Facade Systems: Aluminium curtain wall systems, cladding panels, and modular construction components. High-volume, fast installation with consistent thread quality.
HVAC and Ventilation: Sheet metal ductwork, equipment mounting, and access panels. Thin-gauge materials and one-sided access make rivet nuts the preferred solution.
Electronic Enclosures and Equipment Racks: Creating serviceable threaded connections in thin steel and aluminium enclosures. Supports repeated assembly and disassembly without thread wear.
Rail and Public Transport: Interior panel fixings, seat mounting, and trim assemblies in rolling stock where access is restricted and joint reliability is required.
Parent material thickness and strength: Must match rivet nut grip range and body length.
Material of parent: Determines rivet nut material choice (galvanic compatibility, strength matching).
Thread size and pitch requirement: M4 through M16 are the most common ranges.
Required pull-out strength: Match rivet nut specification to joint load requirement.
Torque resistance required: Choose knurled or hex body for high-torque applications.
Surface finish and aesthetics: Choose an appropriate head profile (flat, CSK, standard).
A regular nut requires through-hole access and a bolt from the other side. A rivet nut installs from one side only, creating a permanent internal thread in the parent material that accepts a standard bolt from the same side. No back-face access is required.
Yes, aluminium rivet nuts are specifically designed for use in aluminium parent materials, providing galvanic compatibility and avoiding the risk of galvanic corrosion that would occur with a steel insert in an aluminium substrate.
Torque resistance depends on rivet nut type, body design (knurled or hex vs. smooth round), material, and parent material strength. Knurled and hex body rivet nuts offer significantly higher torque resistance than smooth round body versions. Supplier technical data sheets provide specific values for each size and configuration.
Rivet nuts are designed as permanent fasteners they are not intended to be removed from the parent material after installation. The bolt or screw threaded into the rivet nut can be removed and replaced repeatedly, but the rivet nut itself remains permanently installed.
A dedicated rivet nut installation tool available in manual, pneumatic, or battery-powered versions is required. The tool must be correctly sized and set for the specific rivet nut diameter and type to achieve the correct installation force and body deformation.
Email: marketing@avlock.co.in
Call: +91 22 25872300
WhatsApp: +91 91520 94678
