Home > Products > Blind Rivets Nuts & Stud Fasteners for Sheet Metal > Steel Special Rivet Nuts > Custom Flat Head Knurled Body Blind Rivet Nuts for Soft Materials

Custom Flat Head Knurled Body Blind Rivet Nuts for Soft Materials

JUXIN FASTENERS supplies custom Flat Head Open-End Knurled Body Blind Rivet Nuts for automotive sheet-metal and compatible lightweight-material assemblies.

The ribbed round body is designed to engage a correctly sized mounting hole and help resist insert rotation. The flat-head flange provides front-side support, while the open-end barrel allows suitable mating screw engagement.

Head Type: Flat Head
Body Type: Knurled / Ribbed Round Body
End Type: Open End
Installation: One-Sided Blind Installation
Thread Size, Material, Finish and Grip Range: According to the approved product drawing

Inquire Now Next Product Download

Product Specification

Product Specifications

Product Name: Custom Flat Head Open-End Knurled Body Blind Rivet Nuts

North American Search Category: Thick-Wall Twist-Resistant Rivet Nuts for Soft Materials

Product Category: Custom Automotive Blind Rivet Nuts

Head Type: Flat Head

Body Type: Knurled / Ribbed Round Body

End Configuration: Open End

Installation Method: One-Sided Blind Installation

Mounting Hole: Compatible Round Hole

Thread Size: To be confirmed from the approved drawing

Material: To be confirmed from the approved specification

Surface Treatment: To be confirmed from the approved specification

Grip Range: To be confirmed from the approved drawing

Wall Thickness: To be confirmed from the approved drawing

Wedge Geometry: To be confirmed from the approved drawing

Mechanical Performance: Subject to application-specific validation

Primary Market: Automotive OEM and Lightweight-Material Assemblies

Product Overview

JUXIN FASTENERS supplies custom flat head open-end knurled body blind rivet nuts for automotive OEMs, commercial vehicle manufacturers, and industrial equipment producers requiring threaded connections in sheet-metal and selected lightweight-material assemblies.

The product features a flat-head flange, a round body with external knurling, and an open-end threaded barrel.

The knurled body is designed to engage the surrounding parent material after installation, helping resist rotation when mating screws are tightened or removed.

The deformable barrel creates backside retention, allowing installation from one accessible side of the assembly.

This configuration may be evaluated for aluminum sheet-metal components and compatible composite panels where the required retention can be achieved without damaging the parent material.

The actual thread size, material, grip range, body dimensions, and mechanical performance must be confirmed against the approved product drawing.

Thick-Wall Twist-Resistant Rivet Nuts for Soft Materials

In the North American industrial fastener market, thick-wall twist-resistant rivet nuts for soft materials describe specialized inserts intended to provide rotational engagement and mechanical retention in selected relatively soft parent materials.

These designs may combine external ribs, localized wedge features, and increased body wall thickness.

However, these characteristics are not universal to every knurled rivet nut.

For this JUXIN configuration, the visible external knurling supports classification as a knurled or ribbed round-body blind rivet nut.

Any claim of additional wedge features or thick-wall construction must be confirmed using the actual product drawing.

The term "twist-resistant" describes the intended anti-rotation function and does not establish a numerical spin-out rating.

Why Parent-Material Hardness Matters

A knurled rivet nut relies partly on the interaction between its external body features and the surrounding parent material.

In relatively soft materials, the knurling may create localized engagement with the mounting-hole wall.

This can help resist rotation after installation.

However, the engagement mechanism changes with parent-material hardness.

In harder materials, the same knurling may produce less penetration or a different contact pattern.

For automotive engineering, the parent material should therefore be identified before selecting the insert.

Important factors include:

Parent-material type
Material hardness
Panel thickness
Mounting-hole diameter
Hole tolerance
Knurl geometry
Installation deformation
Applied tightening torque

A rivet nut qualified in one aluminum alloy should not automatically be considered suitable for another aluminum alloy, steel panel, or composite laminate.

Automotive Lightweight-Material Applications

Automotive manufacturers increasingly use lightweight materials to manage vehicle mass, packaging, and structural efficiency.

These materials may include aluminum alloys, selected composite panels, and mixed-material assemblies.

Custom knurled body blind rivet nuts may be evaluated for:

Automotive aluminum equipment brackets
Electric vehicle lightweight mounting panels
Commercial truck aluminum equipment frames
Automotive sheet-metal housings
EV battery system accessory panels
Vehicle electrical equipment mounting points
Automotive interior support panels
Lightweight service access covers
Commercial vehicle body equipment
Thermal management equipment brackets
Industrial aluminum enclosures
Selected composite equipment panels

These are potential engineering applications rather than confirmed approvals for every vehicle system.

For structural, crash-related, or safety-critical connections, the complete joint must be qualified against the applicable OEM requirements.

Knurled Body and Rotational Retention

The external ribs or knurling are intended to improve mechanical engagement with the surrounding mounting-hole wall.

During screw tightening or removal, torque can be transferred from the mating screw to the installed insert.

If the insert rotates inside the panel, the threaded connection may become difficult to service or repair.

For automotive OEM applications, spin-out resistance is therefore an important design consideration.

Actual performance depends on:

Knurl profile
Body diameter
Parent-material hardness
Hole dimensions
Panel thickness
Installation stroke or force
Backside deformation
Screw tightening conditions

A knurled body should not be described as completely spin-proof.

The required spin-out torque must be established through representative testing.

Ribbed Body vs. Wedge-Enhanced Body

Not all twist-resistant rivet nuts use the same external geometry.

A conventional knurled body may use longitudinal ribs or another textured surface to engage the parent material.

A wedge-enhanced design may incorporate additional localized protrusions intended to engage selected softer materials.

These designs may behave differently during installation and under applied torque.

The JUXIN product shown uses a visibly knurled round body.

Before identifying it as a wedge-enhanced or thick-wall version, engineers should verify:

Actual knurl profile
Presence of separate wedge features
Body wall thickness
Applicable parent materials
Required mounting-hole dimensions
Installation deformation
Mechanical retention data

This distinction helps prevent incorrect substitutions based only on similar product photographs.

Aluminum Panels: Engineering Selection

Aluminum sheet-metal assemblies are a relevant application area for twist-resistant rivet nuts.

However, aluminum alloys vary in strength, hardness, temper, and deformation behavior.

For automotive aluminum panels, engineers should consider:

Alloy and temper
Sheet thickness
Hole geometry
Local bearing stress
Installation deformation
Spin-out resistance
Pull-out resistance
Corrosion compatibility

A rivet nut that performs well in one aluminum sheet may not provide the same results in a harder alloy or a thinner panel.

Representative installation trials are recommended before production approval.

Composite Panels: Additional Design Considerations

Composite panels require particular attention because their mechanical behavior differs from conventional sheet metal.

Depending on the material, local installation forces may cause crushing, delamination, cracking, or permanent deformation.

For composite applications, engineers should evaluate:

Composite material system
Laminate thickness
Hole-edge quality
Local compressive strength
Backside bearing area
Installation force
Long-term creep
Temperature exposure
Required joint loads

The use of a knurled or wedge-enhanced insert does not automatically establish compatibility with every composite material.

Where necessary, an alternative insert design or local reinforcement may be required.

Thick-Wall Construction and Load Distribution

Some specialized rivet nuts use increased body wall thickness to meet particular mechanical requirements.

Thick-wall construction may influence thread strength, body deformation, and load transfer.

However, a thicker wall does not automatically produce greater installed joint capacity.

The final performance also depends on:

Parent-material strength
Mounting-hole dimensions
Insert geometry
Backside deformation
Flange contact
Thread engagement
Applied load direction

For this product, wall thickness must be verified from the approved drawing before making a thick-wall claim.

Likewise, heavy-duty or structural-load claims require product-specific mechanical testing.

Round-Hole Installation

The knurled round-body design is intended for installation in a compatible round mounting hole.

The hole may be drilled, punched, or produced using another approved manufacturing process.

For automotive production, mounting-hole quality should be controlled.

Important requirements include:

Hole diameter
Hole tolerance
Roundness
Burr condition
Parent-material thickness
Material hardness
Hole-position accuracy
Surface coating

An oversized hole may reduce rotational retention.

An undersized hole may interfere with insertion or damage the insert or panel.

The correct hole dimensions must be taken from the approved drawing.

Installation in Soft Materials

Installation in relatively soft parent materials requires careful control of deformation.

The setting tool applies axial force to deform the designated barrel section behind the panel.

This creates the backside retention needed to secure the threaded insert.

However, excessive installation force may damage softer materials.

For aluminum and composite assemblies, engineers should validate:

Tool and mandrel compatibility
Setting force or stroke
Flange seating
Backside deformation
Parent-material damage
Internal thread condition
Spin-out resistance
Pull-out and push-out resistance

Under-setting may result in inadequate retention.

Over-setting may deform the panel, damage the insert, or compromise the surrounding material.

Installation parameters should be established using representative production components.

Open-End Design and Screw Engagement

The open-end barrel allows a mating screw to extend through the insert where sufficient backside clearance is available.

This may be useful when coordinating screw length and joint stack-up.

For automotive applications, engineers should verify:

Thread compatibility
Required thread engagement
Screw projection
Backside clearance
Adjacent component interference
Required clamp load

An open-end rivet nut does not provide a sealed threaded connection.

Where moisture, dust, or fluid ingress must be controlled, a separate sealing solution may be necessary.

Metric and Inch Thread Selection

The actual thread size for this custom product must be confirmed against the approved drawing.

For international OEM sourcing, metric threads should be specified according to the relevant ISO requirements.

ISO 261 and ISO 965 may be applicable to metric thread selection and tolerances.

For North American purchasing, ASME B1.1 may be relevant when reviewing Unified inch-thread specifications.

Metric and UNC/UNF threads are not directly interchangeable.

A nominal diameter conversion does not establish thread compatibility.

Any inch-thread version must be treated as a separate product configuration requiring dimensional and supply confirmation.

Surface Treatment and Corrosion Protection

The surface-treatment specification for this custom product must be confirmed from the approved drawing or purchase specification.

For steel rivet nuts, zinc-based coatings may be considered where the application requires corrosion protection.

However, coating suitability depends on:

Base material
Coating system
Coating thickness
Passivation chemistry
Environmental exposure
Parent-material compatibility
Restricted-substance requirements

Relevant references may include ISO 4042 for electroplated fastener coating systems and ISO 9227 or ASTM B117 where specified for corrosion testing.

No particular coating system, salt-spray performance, or corrosion rating is claimed without verified product-specific documentation.

Galvanic Corrosion in Aluminum Assemblies

When steel inserts are installed in aluminum panels, galvanic corrosion may be a concern in wet environments.

For automotive applications, engineers should consider:

Aluminum alloy
Insert material
Coating system
Mating screw material
Moisture exposure
Electrical contact
Protective coatings
Sealing arrangements

A suitable coating or isolation strategy may be required according to the complete joint design.

The use of a knurled body does not independently address galvanic corrosion.

Mechanical Retention Testing

For automotive OEM qualification, mechanical retention should be evaluated using the actual parent material and installation conditions.

Important characteristics include:

Spin-out resistance
Pull-out resistance
Push-out resistance
Thread stripping resistance
Parent-panel deformation
Repeated assembly performance

Spin-out resistance measures the torque required to rotate the installed insert.

Pull-out resistance evaluates axial extraction.

Push-out resistance evaluates displacement in the opposite axial direction.

These are separate performance characteristics.

No numerical mechanical rating is claimed without product-specific test data.

Vibration and Joint Reliability

Automotive assemblies may experience vibration, shock, temperature variation, and repeated maintenance operations.

The knurled body helps address insert rotation within the mounting hole.

It does not independently prevent mating screw loosening.

The complete joint should be evaluated for:

Mating screw properties
Tightening torque
Clamp-load retention
Thread engagement
Joint stiffness
Vibration exposure
Thermal cycling
Repeated assembly and disassembly

Where required, a suitable screw-locking strategy should be specified separately.

Automotive OEM and Tier 1 Supplier Qualification

For automotive OEM and Tier 1 sourcing, qualification should address the complete technical specification.

Recommended review items include:

Approved product drawing
Thread specification
Body and flange dimensions
Knurl geometry
Wall thickness
Parent-material compatibility
Mounting-hole dimensions
Grip range
Material specification
Surface-treatment requirements
Installation parameters
Spin-out performance
Axial retention
Inspection and traceability requirements

Customer-specific programs may require dimensional inspection records, material documentation, coating certificates, first article inspection, PPAP submissions, or additional automotive quality records.

APQP, PPAP, IMDS, and IATF 16949-related requirements should be addressed according to the actual customer program.

No certification or OEM approval is implied without supporting evidence.

Automotive Procurement and Total Installed Cost

For purchasing managers, sourcing engineers, and supplier development teams, rivet nut selection should consider both product cost and installation cost.

Important factors include:

Parent-material compatibility
Mounting-hole preparation
Installation-tool requirements
Assembly cycle time
Required mechanical retention
Inspection procedures
Rework risk
Packaging and traceability
Annual purchasing volume
Delivery planning

A low-cost insert may create additional assembly costs if the parent material is damaged during installation or if rotational retention is inconsistent.

For high-volume automotive programs, the complete technical specification should be established before production purchasing quantities are finalized.