Steel Full Hex Closed-End Sealing Blind Rivet Nuts with Plastic Seal

Product Specifications

Product Name: Steel Full Hex Closed-End Sealing Blind Rivet Nuts with Plastic Seal

North American Search Name: Twist-Resistant Closed-End Sealing Rivet Nuts

Alternative Names: Full Hex Sealing Rivet Nuts; Closed-End Sealed Blind Rivet Nuts; Under-Flange Sealing Rivet Nuts; Overmolded Sealing Rivet Nuts

Product Category: Custom Automotive Sealing Fasteners

Material: Steel

Thread Sizes: M5, M6, M8

Thread Pitch and Tolerance: According to the approved drawing

Head Type: Flat Head

Body Type: Full Hexagonal

End Configuration: Closed End

Seal Configuration: Plastic sealing feature beneath the flange

Seal Material and Hardness: According to the approved specification

Grip Range: 0.5–3.0 mm (approximately 0.020–0.118 in)

Surface Treatment: Color Zinc or RoHS Blue Zinc, subject to approved coating specifications

Installation: One-Sided Blind Installation

Mounting Hole: Compatible hexagonal hole, dimensions according to the approved drawing

Mechanical Retention: Subject to product-specific validation

Sealing Performance: Subject to installed-joint testing

Primary Market: Automotive OEM, Electric Vehicles and Industrial Enclosures

Product Overview

JUXIN FASTENERS supplies custom steel full hex closed-end sealing blind rivet nuts for automotive OEMs, electric vehicle manufacturers and industrial equipment suppliers.

This specialized fastening component combines three important functions: mechanical anti-rotation engagement, blind-side threaded attachment and a sealing interface beneath the flange.

The full hexagonal body is designed to engage a compatible hexagonal mounting hole, helping resist rotation during screw installation and removal.

The closed-end barrel prevents the mating screw from extending beyond the insert when the correct screw length is used.

The under-flange plastic sealing feature is intended to provide a sealing interface between the rivet nut flange and the surrounding panel.

Together, these features make the product relevant to automotive electrical enclosures, equipment housings and selected assemblies where mechanical retention and environmental protection must be considered simultaneously.

The final sealing capability depends on the complete installed joint, including the panel surface, mounting hole, seal compression and installation conditions.

Engineering Difference: Sealing Rivet Nuts vs. Standard Rivet Nuts

A conventional blind rivet nut primarily provides an internal thread in sheet metal or another compatible parent material.

A sealing rivet nut introduces an additional design requirement: controlling potential leakage paths through or around the installed fastener.

For this product, the closed-end barrel and under-flange plastic seal address two different potential leakage paths.

The closed end blocks the direct opening through the threaded barrel.

The plastic seal beneath the flange is intended to address the interface between the flange and the parent panel.

Both functions matter when a rivet nut is installed in an equipment enclosure.

However, a sealed barrel alone does not guarantee that the complete joint is watertight or airtight.

Likewise, the presence of a plastic seal does not establish a particular pressure rating or IP classification.

The installed assembly must be validated against its actual environmental requirements.

Automotive and Electric Vehicle Applications

Automotive manufacturers use sealed fastening systems in selected locations where equipment must be protected from moisture, dust and environmental contamination.

Potential applications include:

• Automotive electrical enclosure mounting points

• Vehicle fuse box housings

• Electric vehicle control unit enclosures

• Battery management system accessory housings

• EV power electronics equipment covers

• Automotive junction box mounting assemblies

• Vehicle electrical distribution equipment

• Automotive sensor equipment housings

• Commercial vehicle electrical enclosures

• Thermal management equipment housings

• Automotive service access panels

• Industrial control cabinet assemblies

These are potential application areas, not confirmed approvals for every vehicle system.

For high-voltage battery enclosures, safety-critical systems or components subject to specific pressure and ingress requirements, additional qualification is necessary.

Full Hexagonal Body and Twist Resistance

The full hexagonal body is an important mechanical distinction from a round-body knurled rivet nut.

Its flat sides engage the corresponding surfaces of a compatible hexagonal mounting hole.

This geometric engagement helps resist rotation of the installed rivet nut when the mating screw is tightened or loosened.

For automotive production, rotational retention is important because an insert that spins inside its mounting hole may become difficult to tighten, remove or service.

However, actual anti-rotation performance depends on:

• Hexagonal body dimensions

• Mounting-hole geometry

• Hole tolerance

• Parent-material strength

• Panel thickness

• Installation deformation

• Applied screw torque

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

Required spin-out torque must be established through representative testing.

Hexagonal Mounting Hole Requirements

A full hexagonal rivet nut generally requires a compatible hexagonal mounting hole to provide its intended geometric anti-rotation function.

The hole may be produced by punching, laser cutting or another approved manufacturing process.

Important hole characteristics include:

• Across-flats dimension

• Corner geometry

• Dimensional tolerance

• Burr condition

• Panel thickness

• Parent-material hardness

• Surface condition

• Hole-position accuracy

The required hole dimensions must be taken from the approved product drawing.

A conventional round hole should not be substituted for a hexagonal hole without a separately validated design.

For automotive OEM sourcing, hole preparation should be considered as part of total installed cost.

Under-Flange Plastic Seal

The sealing feature beneath the flange is a defining characteristic of this custom product.

During installation, the seal is intended to form a contact interface between the rivet nut flange and the parent-panel surface.

The effectiveness of this interface depends on several factors:

• Seal geometry

• Seal material

• Seal hardness

• Compression behavior

• Flange seating

• Panel surface finish

• Hole-edge condition

• Temperature exposure

• Fluid compatibility

• Long-term compression behavior

The seal must be compatible with the intended automotive environment.

Potential exposures may include water, road spray, cleaning agents, temperature changes and selected automotive fluids.

The exact seal polymer has not been specified.

Therefore, it should not be identified as PVC, EPDM, silicone or another material without confirmation.

Overmolded vs. Separately Applied Sealing Features

Automotive sealing rivet nuts may use different manufacturing approaches.

Some products incorporate an overmolded polymer feature bonded or mechanically retained around the flange.

Others use a separately assembled gasket, sealing washer or applied sealing compound.

These approaches may differ in manufacturing consistency, handling requirements and compression behavior.

For this JUXIN product, the supplied description identifies a plastic sealing feature associated with an overmolding configuration.

The approved drawing and manufacturing specification should confirm whether the seal is overmolded, mechanically retained or separately applied.

This distinction matters for OEM quality control and replacement-part identification.

Closed-End Barrel and Contamination Protection

The closed-end barrel provides a physical barrier at the rear of the threaded insert.

This can help prevent direct contamination through the barrel opening and prevent a correctly selected mating screw from protruding beyond the insert.

For electrical equipment housings, these functions may be useful where nearby components or restricted internal space require protection.

However, the closed-end construction introduces an important screw-length constraint.

A screw that is too long may bottom out against the closed end before developing the intended clamp load.

Engineers should verify:

• Usable internal thread depth

• Screw length

• Thread engagement

• Joint stack-up

• Screw-tip clearance

• Tightening torque

• Required clamp load

The actual usable depth must be confirmed from the approved drawing.

IP67 and IP68 Enclosure Design Considerations

Sealed rivet nuts may be considered in assemblies designed to meet specified ingress-protection requirements.

IEC 60529 defines the IP classification system used for electrical enclosures.

IP67 and IP68 involve different water-ingress test conditions, and the applicable requirements must be understood at the complete enclosure level.

The presence of a closed-end rivet nut and plastic seal does not automatically establish IP67 or IP68 performance.

For an automotive enclosure, engineers should consider:

• Complete enclosure design

• All fastener penetration points

• Gasket interfaces

• Seal compression

• Mounting-hole tolerances

• Panel deformation

• Temperature cycling

• Water exposure

• Pressure differentials

• Assembly repeatability

Any claimed enclosure IP rating requires appropriate testing of the assembled product under the applicable specification.

No IP67, IP68 or pressure-tight performance is claimed for this rivet nut without verified test data.

Grip Range: 0.5–3.0 mm

The specified grip range is 0.5–3.0 mm.

This corresponds approximately to 0.020–0.118 in.

Grip range refers to the parent-material thickness that the specified rivet nut is intended to accommodate.

It is not equivalent to the insert's overall length, flange thickness or internal thread depth.

For sealed installations, panel thickness can affect both backside retention and flange seating.

The installation must therefore be evaluated for mechanical retention and seal compression.

A rivet nut installed outside its approved grip range may experience insufficient deformation, excessive deformation or inconsistent sealing contact.

The same grip range has been supplied for the product family, but individual M5, M6 and M8 drawings should confirm the applicable dimensions.

M5, M6 and M8 Metric Thread Selection

The specified thread sizes are M5, M6 and M8.

Nominal diameter references:

M5: 5.0 mm, approximately 0.197 in

M6: 6.0 mm, approximately 0.236 in

M8: 8.0 mm, approximately 0.315 in

Common ISO metric coarse-thread designations are M5 × 0.8, M6 × 1.0 and M8 × 1.25.

These pitch values are references only. The actual thread specification must follow the approved product drawing.

Relevant metric thread standards include ISO 261 and ISO 965.

For North American purchasing, approximate diameter similarity does not establish interchangeability with UNC or UNF threads.

ASME B1.1 applies to Unified inch-thread specifications, which are distinct from ISO metric threads.

Any inch-thread version requires separate product and supply confirmation.

Steel Material and Zinc Surface Treatment

The confirmed base material is steel.

The available surface-treatment descriptions are Color Zinc and RoHS Blue Zinc.

For automotive OEM purchasing, these commercial finish names should be translated into an approved coating specification.

Important requirements include:

• Coating chemistry

• Coating thickness

• Passivation system

• Restricted-substance compliance

• Corrosion-performance requirements

• Thread fit after coating

• Compatibility with the plastic seal

• Coating inspection criteria

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

RoHS compliance must be supported by appropriate material and process documentation.

Coating color alone does not establish compliance.

No specific salt-spray duration, coating thickness or corrosion-resistance rating is claimed without verified documentation.

Corrosion and Seal Compatibility

A sealed rivet nut must be evaluated as a combination of metal, coating and polymer.

For automotive applications, the coating and seal should be compatible with the intended operating environment.

Potential concerns include:

• Moisture exposure

• Galvanic corrosion

• Coating degradation

• Seal compression set

• Temperature cycling

• Cleaning chemicals

• Automotive fluid exposure

• Seal displacement during installation

When steel inserts are installed in aluminum panels, galvanic corrosion should also be considered.

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

Installation Process for Automotive Production

The rivet nut is installed using compatible blind rivet nut setting equipment.

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

This creates backside retention while the flange seats against the accessible panel surface.

For this sealed configuration, installation must achieve both mechanical retention and the intended seal contact.

Important process controls include:

• Correct hexagonal mounting-hole dimensions

• Panel thickness within the approved grip range

• Compatible mandrel and nosepiece

• Correct setting force or stroke

• Flange seating

• Seal position

• Seal compression

• Backside deformation

• Internal thread condition

• Axial retention

• Spin-out resistance

Under-setting may produce insufficient mechanical retention or inadequate seal contact.

Over-setting may damage the insert, deform the panel or excessively compress the seal.

Installation parameters should be established using representative production components.

Mechanical Retention and Sealing Validation

Automotive OEM qualification should evaluate mechanical and environmental performance separately.

Mechanical tests may include:

• Pull-out resistance

• Push-out resistance

• Spin-out torque

• Thread stripping resistance

• Parent-panel deformation

Sealing evaluation may include:

• Water ingress testing

• Pressure or leakage testing where required

• Seal compression assessment

• Thermal cycling

• Environmental aging

• Fluid compatibility

• Post-installation inspection

A successful mechanical retention test does not establish sealing performance.

Similarly, a successful initial leakage test does not automatically establish long-term durability.

The acceptance criteria should be defined by the OEM application.

Vibration and Joint Reliability

Automotive assemblies may experience vibration, shock and repeated temperature changes.

The full hexagonal body helps resist rotation within the mounting hole.

However, this does not independently prevent the mating screw from loosening.

The complete joint should be evaluated for:

• Screw tightening torque

• Clamp-load retention

• Thread engagement

• Joint stiffness

• Vibration exposure

• Thermal cycling

• Seal durability

• Repeated assembly and disassembly

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

Repeated disassembly may also affect the sealing interface.

Service and reuse requirements should therefore be established during engineering validation.

Automotive OEM and Tier 1 Qualification

For automotive OEM and Tier 1 sourcing, the complete product specification should be reviewed before production approval.

Recommended qualification items include:

• Approved product drawing

• M5, M6 or M8 thread specification

• Steel material specification

• Zinc coating specification

• Full hexagonal body dimensions

• Mounting-hole geometry

• Grip range

• Closed-end depth

• Plastic seal material

• Seal manufacturing method

• Seal compression requirements

• Installation parameters

• Mechanical retention

• Sealing performance

• Inspection and traceability requirements

Customer-specific programs may require first article inspection, material documentation, coating reports, sealing test records, PPAP submissions or additional quality documentation.

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

No particular certification, automotive approval or PPAP status is implied without supporting evidence.

Automotive Procurement and Total Installed Cost

For purchasing managers, supplier development engineers and OEM sourcing teams, a sealing rivet nut should be evaluated as a complete installed fastening system.

Relevant commercial considerations include:

• Insert manufacturing cost

• Plastic seal manufacturing method

• Hexagonal hole preparation

• Installation cycle time

• Seal inspection requirements

• Mechanical testing

• Environmental testing

• Assembly rework risk

• Packaging and traceability

• Annual purchasing volume

• Delivery planning

A combined threaded insert and sealing feature may reduce the need for certain separately handled components in a suitable assembly.

However, any assembly-cost advantage must be confirmed through actual production evaluation.

The lowest unit price does not necessarily provide the lowest total installed cost.

Other Industrial Applications

Beyond automotive and electric vehicle manufacturing, similar sealed rivet nuts may be evaluated for:

• Industrial electrical enclosures

• Control cabinet housings

• Commercial vehicle equipment

• Outdoor equipment panels

• Industrial automation systems

• HVAC electrical housings

• Machinery access covers

• Environmental equipment enclosures

Application suitability must be verified against the actual joint requirements.

Related Fastening Solutions and Internal Linking

Steel Flat Head Open-End Full Hexagonal Body Blind Rivet Nuts

A related full hexagonal body design for applications where a closed-end sealing configuration is not required.

Steel High Flat Head Closed-End Knurled Body Blind Rivet Nuts

A related closed-end design using a knurled round body instead of a full hexagonal body.

Steel Thin Head Open-End Knurled Body Blind Rivet Nuts

An alternative for applications requiring reduced front-side flange projection.

Stainless Steel Closed-End Twist-Resistant Rivet Nuts

An alternative material and body configuration for applications requiring a stainless steel insert.

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

A related anti-rotation design with a partial hexagonal body.

Internal links should connect to the corresponding verified JUXIN FASTENERS product pages using descriptive anchor text.

These products should not be treated as directly interchangeable without engineering review.

OEM RFQ and Engineering Information

For a technical review and quotation, please provide:

• Approved 2D drawing or 3D CAD model

• Required thread size: M5, M6 or M8

• Thread pitch and tolerance

• Parent-panel material

• Panel thickness

• Hexagonal mounting-hole dimensions

• Flange and body dimensions

• Required grip range

• Steel material specification

• Zinc coating requirements

• Closed-end internal depth

• Plastic seal material and geometry

• Seal manufacturing requirements

• Required IP or leakage-test criteria

• Installation-tool information

• Required spin-out torque

• Pull-out and push-out requirements

• Corrosion and environmental requirements

• Inspection and traceability requirements

• Prototype or production quantities

• Estimated annual purchasing volume

• Delivery destination

Why Source Custom Sealing Rivet Nuts from JUXIN FASTENERS?

JUXIN FASTENERS supplies industrial fastening products for drawing-based OEM purchasing and engineering requirements.

For automotive customers, technical discussions can focus on full hexagonal anti-rotation geometry, closed-end screw clearance, under-flange plastic sealing features, installation requirements and mechanical retention.

The specified product family includes M5, M6 and M8 steel full hex closed-end sealing blind rivet nuts with a stated 0.5–3.0 mm grip range and Color Zinc or RoHS Blue Zinc surface-treatment options.

Final product dimensions, coating specifications, seal materials, installation parameters and sealing acceptance criteria must be confirmed before production approval.

Request an Automotive OEM Quotation

Looking for twist-resistant closed-end sealing rivet nuts, custom full hex blind rivet nuts with plastic seals, or automotive enclosure threaded inserts?

Send your drawings, technical specifications, sealing requirements and estimated purchasing quantities to JUXIN FASTENERS.

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

Product Packaging

JUXIN FASTENERS arranges packaging for custom steel full hex closed-end sealing blind rivet nuts according to confirmed order quantities, product dimensions, surface-treatment requirements, plastic seal protection and automotive OEM customer instructions.

Packaging Configuration

Inner Packaging: Suitable protective bags, trays or containers, as agreed.

Outer Packaging: Cartons according to confirmed shipping requirements.

Pallet Packaging: Subject to order and logistics arrangements.

Custom OEM Packaging: According to approved customer specifications.

Quantity per Package: Confirmed during order processing.

Product Identification

Where required, packaging labels may include:

• Product Name: Full Hex Closed-End Sealing Blind Rivet Nut

• Thread Size: M5, M6 or M8

• Material: Steel

• Grip Range: 0.5–3.0 mm

• Surface Treatment: Color Zinc or RoHS Blue Zinc

• Seal Configuration: Under-Flange Plastic Seal

• Customer or Supplier Part Number

• Lot or Batch Number

• Package Quantity

• Customer Purchase Order Number

Product and Seal Protection

Packaging should protect the full hexagonal body, flat-head flange, closed-end barrel, internal threads, zinc coating and plastic sealing feature against unnecessary damage during handling, storage and transportation.

Special attention should be given to preventing distortion, contamination or displacement of the plastic seal.

Packaging should also minimize unnecessary contact that could damage the coating or sealing surface.

Seal Handling and Storage

Any specific temperature limits, shelf-life requirements, storage conditions or handling precautions must follow the approved plastic seal material specification.

Seal-treated parts should be identified and handled according to the confirmed product requirements.

Automotive OEM Packaging and Traceability

For automotive OEM and Tier 1 purchasing programs, packaging and identification requirements may be agreed according to customer-specific logistics procedures.

Where required, arrangements may include lot traceability, barcode labeling, batch segregation, coating identification, seal-material identification and supporting inspection documentation.

Final packaging quantities, carton configurations, labeling formats and shipment arrangements are confirmed before delivery.

For OEM packaging requirements and quotations:

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com