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Steel High Flat Head Open-End Partial Hex Rivet Nuts for EV Applications

Steel High Flat Head Open-End Partial Hex Body Blind Rivet Nuts provide reusable threaded connections for thin sheet-metal assemblies. The partial hexagonal body helps resist rotation in a compatible mounting hole, while the high flat-head flange provides front-side bearing support.

Material: Steel
Thread Sizes: M5, M6
Grip Range: 0.5–2.5 mm
Surface Treatment: Color Zinc or RoHS Blue Zinc
Head Type: High Flat Head
Body Type: Partial Hexagonal
End Type: Open End

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Product Specification

Product Specifications

Product Name: Steel High Flat Head Open-End Partial Hex Body Blind Rivet Nuts

Material: Steel
Thread Sizes: M5, M6
Grip Range: 0.5–2.5 mm (approximately 0.020–0.098 in)
Head Type: High Flat Head
Body Type: Partial Hexagonal / Half Hex
End Type: Open End
Surface Treatment: Color Zinc or RoHS Blue Zinc
Installation: One-Sided Blind Installation
Thread Pitch: According to approved product drawing
Mounting Hole: According to approved product drawing
Steel Grade: Subject to confirmation
Mechanical Performance: Subject to application-specific validation

Product Design and Engineering Features

JUXIN FASTENERS supplies steel high flat head open-end partial hex body blind rivet nuts for electric vehicle manufacturers, automotive component suppliers, and industrial OEMs requiring reusable threaded fastening points in thin sheet-metal assemblies.

The partial hexagonal body provides a non-round engagement feature intended to resist insert rotation within a compatible mounting hole. During installation, the deformable section forms a retaining bulge behind the parent panel, allowing the insert to be installed from one accessible side.

The high flat-head flange provides front-side bearing support. The open-end barrel allows the mating screw to extend through the insert where sufficient backside clearance is available.

These features make the product relevant to automotive assemblies requiring controlled installation, rotational retention, and serviceable threaded connections.

Electric Vehicle and Automotive Applications

Electric vehicle (EV) manufacturers use a variety of fabricated sheet-metal components, equipment housings, mounting brackets, and removable panels requiring reliable threaded fastening points.

Steel partial hex blind rivet nuts may be considered for selected applications including:

EV battery system equipment housings and accessory brackets
Battery management system (BMS) enclosures
EV power electronics housings
Automotive sheet-metal mounting brackets
Electric vehicle thermal management equipment
Automotive electrical equipment enclosures
Vehicle interior equipment panels
Removable service covers and access panels
Commercial vehicle equipment housings

These are potential applications requiring engineering validation, not claims of approval for every automotive assembly.

For battery enclosure applications, engineers must separately verify sealing, electrical isolation, corrosion protection, vibration resistance, and applicable safety requirements.

Partial Hex Body and Anti-Rotation Performance

The partial hex body is designed to provide mechanical resistance to insert rotation through engagement with the mounting-hole geometry.

During screw tightening or removal, torque is transferred to the installed rivet nut. If rotational retention is insufficient, the insert may spin within the parent panel.

The effectiveness of the partial hex design depends on the body dimensions, mounting-hole profile, hole tolerance, parent material, and installation conditions.

Some partial hex rivet nut designs require a matching hexagonal mounting hole, while other specially designed configurations may use a compatible round hole. The approved drawing must establish the correct mounting-hole geometry.

A partial hex body does not automatically prevent mating screw loosening under vibration. Insert spin-out and screw loosening are separate engineering concerns.

High Flat Head and Panel Support

The high flat-head flange provides a bearing surface against the accessible side of the panel.

Its geometry may influence front-side bearing contact, flange projection, local panel loading, and assembly clearance.

Engineers should confirm the flange diameter and thickness against the approved drawing.

A high flat head is not a countersunk head and should not be assumed to sit flush with the mounting surface.

A larger or thicker flange does not automatically establish higher pull-out or push-out strength without supporting test results.

Grip Range and Thin Sheet-Metal Installation

The product-family grip range is 0.5–2.5 mm.

This makes the series relevant to selected thin-sheet applications where direct tapping may not provide sufficient thread engagement.

The approved grip range for each M5 or M6 configuration must be confirmed individually.

Installation outside the approved grip range may affect backside deformation, flange seating, and retention.

For automotive production, mounting-hole dimensions, panel thickness, and installation parameters should be controlled to support repeatable assembly.

Metric Thread Compatibility

Available metric thread sizes are M5 and M6.

Common ISO metric coarse-thread references are M5 × 0.8 and M6 × 1.0. The actual supplied thread pitch and tolerance class must be confirmed from the approved product drawing.

Applicable thread references may include ISO 261 and ISO 965.

Metric threads are not directly interchangeable with UNC or UNF threads.

The inch values shown for the grip range are dimensional references only and do not indicate availability of corresponding inch-thread products.

Installation Process and Tooling

These blind rivet nuts are installed using a compatible rivet nut setting tool.

During installation, the tool applies axial force to deform the designated body section behind the parent panel.

A controlled installation process should verify:

Correct mounting-hole dimensions
Panel thickness within the approved grip range
Appropriate mandrel and nosepiece
Correct insert positioning
Flange seating
Setting force or stroke
Backside deformation
Internal thread condition

Insufficient setting may reduce retention, while excessive setting may damage the insert or surrounding panel.

Installation parameters must be established for the actual product and parent material.

Pull-Out, Push-Out, and Spin-Out Resistance

Three mechanical characteristics are particularly important for automotive fastening applications.

Pull-out resistance concerns axial removal of the installed insert under a defined test arrangement.

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

Spin-out resistance concerns rotation of the installed insert within the mounting hole.

These are separate performance characteristics.

Results depend on the insert geometry, parent material, panel thickness, mounting-hole dimensions, and installation process.

No numerical mechanical performance is claimed without representative test data.

Automotive Vibration and Joint Reliability

Electric vehicle assemblies may experience road vibration, dynamic loading, and repeated maintenance.

Joint reliability depends on the complete fastening system, including the mating screw, tightening torque, thread engagement, joint stiffness, and parent-material properties.

The partial hex body helps address insert rotation but does not independently establish vibration resistance.

Where required, the complete assembly should be evaluated under representative service conditions.

Steel Material and Zinc Surface Treatment

The product is supplied in steel with Color Zinc or RoHS Blue Zinc surface-treatment options.

The exact steel grade, coating thickness, passivation chemistry, and corrosion-performance requirements must be confirmed against the approved specification.

Zinc-based coatings are commonly used to protect steel fasteners against corrosion.

However, coating appearance alone does not establish corrosion resistance or restricted-substance compliance.

Where RoHS compliance is required, the applicable coating chemistry and supporting documentation should be verified.

For susceptible higher-strength steel components, electroplating-related hydrogen embrittlement risks should also be reviewed.

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

No particular salt-spray rating or coating service life is assumed.

Galvanic Corrosion in Electric Vehicle Assemblies

Electric vehicles may use steel, aluminum alloys, and other materials within the same assembly.

Where dissimilar conductive materials are electrically connected in the presence of an electrolyte, galvanic corrosion may occur.

For zinc-plated steel rivet nuts installed in aluminum panels, engineers should evaluate the coating system, moisture exposure, mating screw material, and any required isolation or protective measures.

Thermal Cycling and Material Compatibility

Automotive components may experience significant temperature changes.

Different materials expand and contract at different rates, potentially influencing local contact conditions and joint behavior.

Where steel inserts are installed in aluminum or other parent materials, the complete assembly should be evaluated for the intended temperature range and service conditions.

Industrial Applications Beyond Electric Vehicles

In addition to automotive applications, these rivet nuts may be considered for:

Industrial machinery housings
Automation equipment
Electrical cabinets and control panels
HVAC equipment
Agricultural machinery
Fabricated metal enclosures
Commercial equipment brackets
Removable maintenance panels

The selected product must be validated for the actual installation geometry and mechanical requirements.

OEM Engineering Selection Considerations

Before approving a steel partial hex rivet nut, engineers should confirm:

M5 or M6 thread requirement
Steel material specification
Parent-panel material and thickness
Mounting-hole geometry and tolerance
Flange dimensions
Partial hex body dimensions
Approved grip range
Available backside clearance
Mating screw specifications
Installation tool compatibility
Required tightening torque
Pull-out and push-out requirements
Spin-out resistance
Vibration and environmental requirements
Surface-treatment specification

Automotive OEM Procurement and Supplier Qualification

For electric vehicle manufacturers and automotive Tier 1 and Tier 2 suppliers, fastener qualification requires more than matching the nominal thread size.

Two M6 partial hex rivet nuts may differ in flange dimensions, body geometry, mounting-hole requirements, grip range, steel grade, coating system, and mechanical retention.

Before approving an alternative supplier, procurement teams should compare the complete drawings and applicable technical specifications.

Where required by the customer program, supplier qualification may include dimensional inspection, material documentation, coating records, traceability, first article inspection, and agreed automotive quality submissions.

APQP, PPAP, IMDS, and IATF 16949-related requirements should be addressed according to the actual customer program. No certification or customer approval is implied without supporting documentation.

Total Installed Cost for OEM Purchasing

For OEM procurement, the purchase price of the rivet nut is only one component of the total installed cost.

Other considerations include mounting-hole preparation, installation tooling, assembly cycle time, inspection, rework, scrap, coating requirements, and supplier qualification.

A partial hex design may be commercially advantageous where its rotational retention and installation characteristics meet the application requirements.