Blind Rivet Nuts: Types, Grip Range, Installation, Materials and OEM Sheet Metal Design Guide

Blind Rivet Nuts: Types, Grip Range, Installation, Materials and OEM Sheet Metal Design Guide

Creating reliable internal threads in thin sheet metal, hollow sections and closed assemblies is a common engineering challenge.

Conventional tapping may not provide sufficient thread engagement in thin materials, 

while a separate nut may be impossible to install when the rear side of the component is inaccessible.

Blind rivet nuts, also known as rivet nuts, nutserts or blind threaded inserts, 

provide a practical solution by creating a permanent threaded attachment point using installation access from only one side.

They are widely considered for industrial enclosures, machinery, automotive equipment, electrical cabinets, 

HVAC systems, robotics and other sheet-metal assemblies.

However, choosing the correct rivet nut requires more than matching the thread size.

The installation hole, sheet thickness, grip range, flange geometry, body design, material, setting force and service loads must work together.

For design and mechanical engineers, the critical questions concern joint geometry, substrate strength, pull-out resistance, torque resistance and corrosion.

For manufacturing engineers and production managers, the priorities are repeatable installation, 

correct tool settings, manageable cycle times, consistent hole quality and low rework rates.

For purchasing managers, procurement specialists and supplier development teams, the priorities include drawing conformity, material selection,

 OEM customization, qualification requirements, MOQ, delivery schedules and long-term supply consistency.

Juxin Fasteners supplies industrial fastening products and welcomes drawing-based inquiries for blind rivet nuts,

 hex rivet nuts, knurled rivet nuts, sealed rivet nuts and custom threaded inserts.

What Is a Blind Rivet Nut?

A blind rivet nut is an internally threaded fastener installed into a prepared hole from one accessible side of the workpiece.

During installation, a tool pulls on the internal thread while supporting the flange.

The deformable portion of the rivet nut collapses behind the substrate, creating a mechanical retention feature.

After the tool is removed, the rivet nut remains installed and provides an internal thread for a mating screw or bolt.

Main Functional Elements

A typical blind rivet nut includes:

• Internal machine thread

• Cylindrical or shaped body

• Deformable setting section

• Head or flange

• Installation grip range

• Defined overall length

• Material and surface finish

Why Blind Installation Matters

Blind rivet nuts are particularly useful when the rear side of the substrate cannot be reached.

Examples include:

• Closed box sections

• Hollow metal profiles

• Tubular structures

• Electrical enclosures

• Vehicle body panels

• Preassembled equipment frames

Important Design Limitation

A blind rivet nut does not automatically provide the same strength as a welded nut, solid threaded block or through-bolt assembly.

Its performance depends on the complete rivet nut–substrate system.

How Do Blind Rivet Nuts Work?

Blind rivet nuts create retention through controlled deformation of the insert body.

Installation Sequence

1. Prepare the specified installation hole.

2. Check the hole diameter, shape and burr condition.

3. Thread the rivet nut onto the installation tool mandrel.

4. Insert the rivet nut into the workpiece.

5. Support the flange against the substrate.

6. Apply the specified installation stroke or force.

7. Allow the deformable section to collapse behind the substrate.

8. Release the tool and check the installed condition.

The exact procedure depends on the rivet nut design and installation equipment.

What Happens During Setting?

The setting tool applies an axial force that compresses the deformable body section.

The body forms an enlarged region behind the substrate.

The flange and rear deformation provide retention.

Why Controlled Setting Is Essential

Insufficient setting can produce a loose insert.

Excessive setting may damage the internal thread, deform the flange or overload the substrate.

The correct setting parameters should be established using the actual rivet nut and workpiece.

Types of Blind Rivet Nuts

Different rivet nut body designs provide different installation and retention characteristics.

The most suitable design depends on the substrate, hole preparation, loading and assembly process.

Round Body Rivet Nuts

Round body rivet nuts are widely used in general industrial sheet-metal applications.

Typical Applications

• Electrical cabinets

• Machinery covers

• Industrial enclosures

• Equipment frames

• Sheet-metal housings

Advantages

• Relatively simple hole preparation

• Broad application suitability

• Compatibility with many installation methods

Engineering Consideration

Round body designs may depend on body deformation, knurling or other retention features to resist rotation.

Their anti-rotation performance must be validated for the substrate and installation conditions.

Hex Body Rivet Nuts

Hex rivet nuts have an external hexagonal body.

They are installed into a corresponding hexagonal hole.

Potential Advantages

• Positive geometric resistance to rotation

• Improved anti-rotation capability in suitable substrates

• Useful for applications involving repeated screw installation

Design Considerations

The installation hole must match the specified hex geometry.

A round hole is not an acceptable substitute unless the particular product is designed and approved for it.

Applications

• Automotive equipment brackets

• Machinery assemblies

• Sheet-metal structures

• Industrial enclosures

Important Limitation

A hex body does not guarantee a particular spin-out torque.

Performance depends on the insert, hole tolerances, material and setting conditions.

Knurled Body Rivet Nuts

Knurled rivet nuts have external surface features intended to improve mechanical engagement with the substrate.

Potential Advantages

• Additional anti-rotation engagement

• Suitable for certain round-hole applications

• Useful where the substrate can accommodate the knurl geometry

Applications

• Aluminum panels

• Industrial sheet metal

• Selected plastic housings

• Machinery covers

Engineering Consideration

Knurl effectiveness depends on the substrate hardness, thickness and installation process.

Knurled inserts are not automatically suitable for every plastic or composite material.

Slotted or Petal Rivet Nuts

Slotted rivet nuts are designed to form multiple expanded sections during installation.

The resulting petal-like deformation can distribute load over a larger rear contact area in suitable materials.

Potential Applications

• Soft substrates

• Selected plastics

• Lightweight panels

• Thin materials requiring broader rear support

Important Limitation

Petal-style expansion does not guarantee superior pull-out resistance in every substrate.

Performance must be tested with the actual panel material and thickness.

Sealed and Closed-End Rivet Nuts

Sealed rivet nuts may use a closed-end body, sealing element or other design feature intended to limit fluid ingress.

Potential Applications

• Outdoor electrical enclosures

• Automotive electronics housings

• Selected EV battery enclosure interfaces

• Equipment exposed to moisture

Critical Sealing Principle

A closed-end rivet nut is not necessarily a complete waterproof joint.

Potential leakage paths include:

• Flange-to-panel interface

• Damaged or oversized installation holes

• Incorrectly compressed sealing elements

• Mating screw interfaces

• Substrate distortion

IP67 and IP68 Claims

Ingress protection ratings under IEC 60529 apply to tested enclosure arrangements under specified conditions.

An individual sealed rivet nut should not be described as making an entire enclosure IP67 or IP68 without appropriate assembly-level validation.

Blind Rivet Nut Type Comparison

Blind Rivet Nut Materials

Material selection influences strength, corrosion resistance, installation behavior, weight and cost.

Carbon Steel Rivet Nuts

Carbon steel rivet nuts are widely considered for general industrial applications.

Potential Advantages

• Cost-effective material selection

• Suitable mechanical performance

• Availability of multiple protective finishes

Surface Treatment Options

Depending on the product and project requirements, possible finishes include:

• Zinc plating

• Zinc-nickel coating

• Zinc-aluminum coating systems

• Other approved finishes

Engineering Consideration

The selected coating must be compatible with the installation process and service environment.

Aluminum Rivet Nuts

Aluminum rivet nuts offer low weight and can be suitable for certain lightweight assemblies.

Potential Advantages

• Reduced component weight

• Suitable for selected aluminum structures

• Relatively low installation force in some designs

Limitations

• Lower mechanical strength than some steel alternatives

• Potential thread wear

• Galvanic corrosion concerns with dissimilar metals

• Substrate-dependent pull-out and torque resistance

Stainless Steel Rivet Nuts

Stainless steel rivet nuts are considered where corrosion resistance is important.

Common material options include:

• 304 stainless steel

• 316 stainless steel

304 Stainless Steel

Often suitable for general industrial corrosion-resistant applications.

316 Stainless Steel

May offer improved resistance to certain chloride-containing environments because of its molybdenum content.

Important Limitations

316 stainless steel is not immune to pitting, crevice corrosion or stress corrosion cracking.

Stainless steel rivet nuts may require higher setting forces than softer alternatives.

Installation equipment must be suitable for the specified product.

Blind Rivet Nut Grip Range: How to Select the Correct Panel Thickness

Grip range is one of the most important specifications for a blind rivet nut.

It identifies the substrate thickness range for which the particular insert is designed to be installed.

Why Grip Range Matters

The deformable body must collapse correctly behind the substrate.

If the substrate is outside the intended grip range, the insert may not form the required retention geometry.

Too Thin a Substrate

Potential problems include:

• Excessive rear deformation

• Reduced stability

• Panel distortion

• Inconsistent retention

Too Thick a Substrate

Potential problems include:

• Insufficient body collapse

• Incomplete setting

• Reduced pull-out resistance

• Installation tool overload

How to Determine Grip Range

Measure the actual thickness of the substrate at the installation location.

Where multiple layers are involved, determine whether the rivet nut design is approved to clamp the full stack.

Consider:

• Nominal sheet thickness

• Material thickness tolerance

• Coatings

• Surface irregularities

• Panel stack-up

• Installation access

Engineering Example

A panel nominally specified at 2.0 mm may have a manufacturing thickness tolerance.

The selected rivet nut grip range must accommodate the permitted thickness variation.

The exact grip range must be taken from the approved product drawing or supplier specification.

Important Distinction

Grip range is not the same as maximum joint strength.

A rivet nut that fits the panel thickness still requires load validation.

Hole Size and Hole Geometry

The installation hole directly affects rivet nut performance.

Round Holes

Used for compatible round-body designs.

Hexagonal Holes

Used for compatible hex-body designs.

Hole Diameter or Across-Flats Dimension

Must follow the approved product specification.

Burr Control

Excessive burrs may prevent proper flange seating.

Hole Deformation

Poor punching or drilling quality may reduce retention consistency.

Edge Distance

The distance from the installation hole to the sheet edge must be sufficient for the substrate and loading.

Engineering Principle

A correct rivet nut installed into an incorrect hole may still fail.

Information Gain: Why Hole Tolerance Can Matter More Than Insert Strength

Consider two identical rivet nuts installed into panels of the same material and thickness.

Assembly A

The installation hole matches the specified size and shape.

Assembly B

The hole is oversized or distorted.

Even when the same installation tool setting is used, the assemblies may develop different anti-rotation and pull-out performance.

Potential Consequences

• Insert rotation

• Loose retention

• Reduced load capacity

• Assembly rework

• Threaded joint failure

Design Lesson

Installation hole control is a functional requirement, not merely a manufacturing convenience.

Blind Rivet Nut Flange Design

The flange supports the rivet nut against the front surface of the substrate.

Flat Head or Large Flange Designs

May provide a larger bearing surface.

Reduced Head Designs

May reduce the amount the flange projects above the panel surface.

Countersunk Designs

May be selected where a flush installation is required, provided the substrate thickness and countersink geometry are suitable.

Engineering Considerations

• Flange diameter

• Flange thickness

• Panel bearing stress

• Countersink geometry

• Component seating

• Surface appearance

Important Limitation

A countersunk rivet nut should not be selected solely for appearance.

Removing material from a thin panel to create a countersink may reduce local substrate strength.

Pull-Out Resistance vs Spin-Out Torque

These are different performance characteristics.

Pull-Out Resistance

The axial load required to remove or fail the installed insert under a defined test condition.

Spin-Out Torque

The torque associated with rotation of the installed insert relative to the substrate under a defined test condition.

Why Both Matter

A rivet nut may resist axial loading but still rotate when a mating screw is tightened.

Conversely, a rivet nut may resist rotation but fail under excessive axial load.

Engineering Recommendation

Specify the appropriate mechanical tests according to the intended loading and assembly requirements.

Other Relevant Failure Modes

• Thread stripping

• Flange deformation

• Substrate tearing

• Fatigue damage

• Insert fracture

• Joint loosening

Installation Stroke and Installation Force

Rivet nut tools deform the insert using controlled mechanical action.

Stroke-Controlled Installation

The tool applies a defined displacement.

Force-Controlled Installation

The tool controls or monitors the applied setting force.

Why Tool Settings Matter

The correct setting depends on:

• Rivet nut design

• Material

• Thread size

• Grip range

• Substrate thickness

• Installation equipment

Under-Setting

May result in insufficient rear deformation.

Over-Setting

May damage the insert or substrate.

Production Recommendation

Validate the tool setting using actual production parts.

Do not assume one setting is suitable for all rivet nuts with the same thread size.

Blind Rivet Nut Installation Tools

Manual Installation Tools

Often suitable for maintenance, prototyping and low-volume work.

Pneumatic Installation Tools

May support faster production where compressed-air equipment is available.

Battery-Powered Installation Tools

Provide portability for suitable installation operations.

Electric and Automated Systems

May support process monitoring, repeatability and integration into production lines.

Production Manager's Considerations

Evaluate:

• Installation cycle time

• Tool ergonomics

• Mandrel wear

• Setup changes

• Thread size changeover

• Setting repeatability

• Operator training

• Maintenance

• Inspection access

Important Qualification

A pneumatic or electric tool does not automatically produce correct installations.

The tool must be matched to the rivet nut and qualified setting parameters.

Blind Rivet Nuts for Automotive Manufacturing

Automotive assemblies may use blind rivet nuts where one-side access and reusable threaded attachment points are required.

Potential Applications

• Interior brackets

• Equipment covers

• Selected body-mounted accessories

• Wiring harness supports

• Non-safety-critical sheet-metal assemblies

Engineering Considerations

• Vibration

• Substrate thickness

• Corrosion exposure

• Installation access

• Assembly torque

• Fatigue

• Serviceability

Safety-Critical Applications

Seat mounts, restraint systems, suspension connections and other safety-critical structures require application-specific approval.

A general-purpose rivet nut must not be assumed suitable for these connections.

EV Battery Pack and Battery Enclosure Applications

EV battery assemblies may require threaded inserts for selected covers, brackets and accessory interfaces.

Potential Applications

• Battery enclosure accessories

• Electrical equipment mounting

• Thermal management brackets

• Service-access panels

• Selected module support components

Engineering Considerations

• Substrate material

• Corrosion

• Electrical isolation

• Thermal expansion

• Vibration

• Sealing

• Service requirements

Sealed Rivet Nuts in Battery Enclosures

A sealed rivet nut may contribute to an enclosure sealing strategy.

However, the complete assembly must be validated for the required environmental conditions.

Important Limitation

A rivet nut must not be selected for a safety-critical battery structural or electrical connection solely on the basis of its nominal material or thread size.

Rail Transit Applications

Blind rivet nuts may be used in selected rail equipment assemblies.

Potential Applications

• Interior panels

• Equipment cabinets

• Electrical enclosures

• Maintenance covers

Engineering Considerations

• Vibration

• Service access

• Corrosion

• Mechanical loading

• Customer-specific qualification

Aerospace and Lightweight Structures

Blind threaded inserts may be considered for selected lightweight panels and interior equipment.

However, aerospace use requires appropriate product qualification, material control and customer approval.

Composite Materials

Composite substrates require particular attention to local crushing, delamination and load distribution.

A rivet nut designed for metal sheet should not automatically be used in composite material.

Electrical Cabinets and Sheet-Metal Fabrication

Electrical cabinets frequently use thin steel or aluminum panels.

Typical Applications

• Control panels

• Electrical enclosures

• Equipment covers

• Access doors

• Cable management brackets

Why Rivet Nuts Are Useful

They provide internal threads where rear access is restricted.

Production Considerations

• Hole punching consistency

• Insert orientation

• Tool access

• Flange seating

• Thread engagement

• Repeated service removal

Alternative Fasteners

Depending on the design, engineers may also consider:

• Self-clinching nuts

• Weld nuts

• Cage nuts

• Clip nuts

• Threaded inserts

Each alternative has different installation and load characteristics.

HVAC and Outdoor Equipment

HVAC equipment may use rivet nuts in sheet-metal housings and mechanical supports.

Potential Applications

• Equipment covers

• Service panels

• Ventilation frames

• Outdoor unit enclosures

Engineering Considerations

• Moisture exposure

• Corrosion

• Thermal cycling

• Vibration

• Maintenance access

Material Selection

Carbon steel with an appropriate coating, aluminum or stainless steel may be considered depending on the environment and design.

Medical and Laboratory Equipment

Selected medical and laboratory equipment may use rivet nuts for removable covers and mechanical assemblies.

Potential Applications

• Instrument housings

• Laboratory equipment frames

• Maintenance panels

• Non-patient-contact mechanical components

Important Qualification

Material selection and installation performance must satisfy the applicable equipment requirements.

A stainless steel rivet nut is not automatically suitable for every medical application.

Machinery, Robotics and Automation

Industrial machinery often requires threaded mounting points in fabricated structures.

Potential Applications

• Robotic equipment covers

• Machine guarding accessories

• Control cabinets

• Sensor brackets

• Automation frames

• CNC machine enclosures

Production Benefits

Where properly designed, rivet nuts may simplify assembly and maintenance.

Design Limitations

High cyclic loads, severe vibration or critical structural loads may require alternative fastening methods.

Information Gain: Why Rivet Nut Rotation Occurs During Bolt Tightening

Rivet nut rotation is a common assembly problem.

Possible Causes

• Oversized installation hole

• Incorrect body style

• Inadequate setting

• Excessive tightening torque

• Unsuitable substrate

• Damaged knurling

• Incorrect grip range

Engineering Solution

Review the installed insert and mating screw together.

A higher-strength bolt does not necessarily solve an insert rotation problem.

Information Gain: Why Pull-Out Failure Can Occur Below Expected Loads

An insert may fail through the substrate rather than through the rivet nut body.

Possible Causes

• Thin panel

• Weak substrate

• Excessive edge loading

• Incorrect hole geometry

• Insufficient rear deformation

• Bending loads

• Poor load distribution

Engineering Lesson

The substrate is part of the load-bearing system.

Rivet nut strength cannot be evaluated independently of the panel.

Information Gain: Why Sealed Rivet Nuts May Still Leak

A closed-end rivet nut may prevent fluid from passing through the body end.

However, water may still enter through the flange-to-panel interface.

Possible Causes

• Inadequate sealing element compression

• Surface roughness

• Panel distortion

• Oversized hole

• Damaged seal

• Incorrect installation

Engineering Recommendation

Test the complete fastened assembly under the required environmental conditions.

Blind Rivet Nut Installation Quality Control

A reliable OEM assembly process requires appropriate controls.

Incoming Inspection

Check:

• Product identity

• Material

• Thread size

• Body dimensions

• Flange dimensions

• Surface condition

• Grip range designation

Hole Inspection

Check:

• Hole size

• Hole shape

• Burr condition

• Edge distance

• Substrate thickness

Installation Control

Check:

• Tool compatibility

• Setting parameters

• Mandrel condition

• Flange seating

• Insert orientation

Post-Installation Verification

Depending on the application, verify:

• Visual condition

• Thread usability

• Pull-out resistance

• Spin-out torque

• Assembly function

• Sealing performance where required

Important Qualification

Inspection frequency and acceptance criteria must be defined by the approved quality plan.

Blind Rivet Nut Failure Mode Comparison

Blind Rivet Nuts vs Other Threaded Fastening Solutions

How to Select the Right Blind Rivet Nut

A practical selection process should consider:

Substrate

Identify material, thickness and strength.

Access

Confirm whether installation is possible from one side.

Thread

Specify diameter, pitch and tolerance.

Grip Range

Select a product covering the actual thickness range.

Body Design

Choose round, hex, knurled, slotted or another suitable design.

Flange

Select the required head geometry.

Mechanical Loads

Define axial, torsional, bending and fatigue requirements.

Environment

Evaluate corrosion, temperature and moisture.

Sealing

Specify assembly-level leakage requirements where applicable.

Production

Confirm tool compatibility, installation rate and inspection requirements.

Commercial Requirements

Confirm production quantity, MOQ, delivery and packaging.

Metric and Inch Thread Compatibility

Blind rivet nuts may be manufactured with metric or Unified inch threads depending on the product design.

Metric Threads

Common nominal sizes include M3, M4, M5, M6, M8, M10 and M12, subject to the actual product range.

Metric thread requirements may reference applicable ISO thread standards.

Unified Inch Threads

UNC and UNF threads are separate systems commonly used in North American industrial applications.

The applicable ASME B1.1 requirements should be considered where specified.

Critical Compatibility Rule

Metric, UNC, UNF, BSW and BSF threads are not directly interchangeable.

Any inch-to-metric diameter conversion is dimensional reference only, not a thread compatibility statement.

OEM Supplier Qualification for Blind Rivet Nuts

Procurement teams should confirm more than the nominal thread size.

Product Requirements

• Drawing and revision

• Body style

• Flange style

• Material

• Thread

• Grip range

• Surface treatment

Installation Requirements

• Hole geometry

• Tooling

• Setting parameters

• Substrate

• Assembly loads

Quality Requirements

• Dimensional inspection

• Functional thread checks

• Pull-out and spin-out requirements

• Corrosion testing where specified

• Sealing verification where applicable

• Traceability requirements

Commercial Requirements

• Prototype quantity

• Annual demand

• MOQ

• Lead time

• Packaging

• Delivery schedule

Supplier Development Principle

Two rivet nuts with the same thread size may not be equivalent if their grip ranges, body designs, installation holes or retention performance differ.

OEM Blind Rivet Nut RFQ Checklist

Frequently Asked Questions

What is the difference between a rivet nut and a nutsert?

Nutsert is a commonly used name for a blind threaded insert. Both terms are used in industrial sourcing, although exact product designs vary.

Can blind rivet nuts be installed from one side?

Yes. One-side installation is a defining feature of blind rivet nuts.

Are hex rivet nuts stronger than round rivet nuts?

Not necessarily in every loading condition. Hex designs may improve anti-rotation performance when installed in suitable hexagonal holes.

How do I select the correct grip range?

Measure the actual substrate thickness and choose an insert with an approved grip range covering that thickness.

Can rivet nuts be used in aluminum panels?

Yes, with suitable product selection and validation of installation and mechanical performance.

Are stainless steel rivet nuts corrosion-proof?

No. Stainless steel offers corrosion resistance but is not immune to corrosion in every environment.

Do sealed rivet nuts guarantee IP67 or IP68 protection?

No. The complete enclosure and fastened interface must be tested for the specified ingress protection requirement.

What causes a rivet nut to spin during bolt tightening?

Common causes include incorrect hole size, insufficient setting, unsuitable body design and excessive assembly torque.

Can blind rivet nuts replace weld nuts?

Sometimes. The alternative must meet the required load, installation, corrosion and production requirements.

What information should an OEM provide for a custom rivet nut quotation?

The drawing, thread, body design, material, grip range, substrate, hole geometry, performance requirements and expected production volume.

Juxin Fasteners: Blind Rivet Nuts and Custom OEM Threaded Inserts

Juxin Fasteners welcomes inquiries for standard and customized industrial threaded fastening products.

Relevant product categories include:

• Blind rivet nuts

• Round body rivet nuts

• Hex body rivet nuts

• Knurled rivet nuts

• Slotted and petal rivet nuts

• Sealed rivet nuts

• Stainless steel rivet nuts

• Aluminum rivet nuts

• Carbon steel rivet nuts

• Custom threaded inserts

Product availability, material grades, grip ranges, installation characteristics, manufacturing feasibility, 

MOQ, inspection documentation and delivery schedules require confirmation against the customer's requirements.

Request Blind Rivet Nuts and OEM Quotations

Are you sourcing blind rivet nuts for sheet metal, hex rivet nuts, knurled rivet nuts, sealed rivet nuts or custom threaded inserts?

Juxin Fasteners welcomes inquiries from design engineers, mechanical engineers, manufacturing engineers, production managers,

 procurement specialists, purchasing managers, supplier development teams and supply chain managers.

For technical review and quotation, please provide:

Product drawing and revision + thread designation + body type + flange design + material + surface finish + substrate material and thickness 

+ grip range + installation hole + tool requirements + pull-out or spin-out performance + sealing requirements 

+ inspection documentation + prototype quantity + annual demand + packaging + delivery schedule.

Company: Juxin Fasteners

Website: https://www.juxinfasteners.com/

Email: info@juxinfasteners.com

Send your blind rivet nut drawings and OEM RFQ to Juxin Fasteners for product selection, technical confirmation and quotation.