120° Countersunk Closed-End Aluminum Blind Rivets

120° Countersunk Closed-End Aluminum Blind Rivets for OEM Sheet-Metal and Equipment Assemblies

Product Overview

JUXIN FASTENERS supplies 120° countersunk closed-end aluminum blind rivets for industrial sheet-metal fabrication, equipment enclosures, lightweight metal assemblies and OEM manufacturing applications.

The product is specified with an aluminum rivet body and two pull-mandrel material configurations:

• Aluminum body with steel mandrel

• Aluminum body with aluminum mandrel

Both configurations are identified in the original product information as closed-end blind rivets with 120° countersunk heads.

The closed-end construction uses a cup-shaped rivet body to restrict the passage of moisture, vapor and contaminants through the mandrel channel.

The 120° countersunk head is designed to fit a matching countersink, reducing head projection when the mounting hole and joint geometry are correctly prepared.

These characteristics can be useful in lightweight metal enclosures, electrical equipment housings and selected industrial assemblies where one-sided installation, surface clearance and leakage control are important.

Actual dimensions, grip ranges, material grades, mechanical performance and joint sealing must be confirmed against the approved engineering specification.

Product Identification and Material Configurations

Material Configuration A — Aluminum Body with Steel Mandrel

This configuration combines an aluminum rivet body with a steel pull mandrel.

The steel mandrel is used to develop the installation force required to deform the rivet body.

The actual setting force, mandrel break characteristics and mechanical performance depend on the approved rivet design.

The presence of a steel mandrel does not establish a particular shear strength, tensile strength or mandrel-locking mechanism.

Material Configuration B — Aluminum Body with Aluminum Mandrel

This configuration uses aluminum for both the rivet body and pull mandrel.

It may be considered where an aluminum/aluminum material combination is preferred for a particular assembly.

However, its mechanical performance and installation requirements must be evaluated independently from the aluminum/steel configuration.

The two material combinations should not be treated as automatically interchangeable.

Key Product Features

• Aluminum closed-end rivet body

• Steel or aluminum pull mandrel options

• 120° countersunk head geometry

• One-sided installation

• Closed cup-shaped construction

• Reduced leakage path through the rivet body

• Potential for reduced head projection

• Suitable for engineering evaluation in lightweight sheet-metal assemblies

• OEM drawing-based dimensional requirements

• Product-specific mechanical and sealing performance

Dimensions and Technical Specifications

Technical Documentation

Please refer to the original JUXIN product PDF/CAD specification, pages 103–104.

The approved technical documentation governs available sizes, grip ranges, tolerances, material grades and mechanical requirements.

Engineering Solution 1 — Closed-End Construction and Leakage Control

The principal difference between closed-end and conventional open-end blind rivets is the rivet-body construction.

A conventional open-end rivet may allow moisture or contaminants to pass through the mandrel channel.

A closed-end rivet uses a cup-shaped body that encloses the blind end of the fastener.

This construction helps restrict leakage through the rivet itself.

Potential applications include:

• Electrical equipment housings

• Industrial metal cabinets

• Protective equipment covers

• Automotive auxiliary enclosures

• HVAC equipment panels

• Outdoor equipment housings

• Lightweight aluminum assemblies

However, a closed rivet body does not automatically establish a watertight or airtight joint.

Leakage can occur around the rivet head, mounting hole or mating surfaces.

Engineering Solution 2 — Rivet-Body Sealing vs. Complete Joint Sealing

Engineers should distinguish between the sealing function of the closed rivet body and the sealing performance of the complete assembly.

Where a customer requires a specified leakage rate, pressure rating or ingress protection level, the complete assembly must be tested under defined conditions.

Closed-end construction alone is not evidence of compliance with those requirements.

Engineering Solution 3 — 120° Countersunk Head for Reduced Surface Projection

The 120° countersunk head is designed for a matching 120° recess.

Correct installation can reduce the projection of the fastener head above the accessible panel.

This may be useful where assemblies include:

• Overlapping sheet-metal panels

• Close-fitting equipment covers

• Sliding or adjacent components

• Limited head clearance

• Smooth external panel surfaces

The head will not necessarily be perfectly flush in every assembly.

The result depends on:

• Countersink angle

• Countersink major diameter

• Countersink depth

• Head geometry

• Panel thickness

• Hole alignment

• Installation conditions

A 120° countersunk rivet should not be substituted for a 90° or 100° countersunk rivet without engineering verification.

Engineering Solution 4 — Countersinking Thin Aluminum Panels

Countersinking reduces the material thickness supporting the fastener head.

For thin aluminum panels, excessive countersink depth can reduce local bearing support and increase the risk of deformation.

Before selecting this rivet, evaluate:

• Original panel thickness

• Remaining material beneath the countersink

• Head diameter and height

• Panel alloy and temper

• Mounting-hole diameter

• Joint loading

• Edge distance

• Rivet spacing

Where the remaining panel material is insufficient, a protruding-head rivet or a redesigned joint may be more appropriate.

Engineering Solution 5 — Aluminum/Steel vs. Aluminum/Aluminum Mandrels

The two material configurations should be compared using actual engineering data rather than general material assumptions.

A steel mandrel may provide different installation and mechanical characteristics, but a higher strength rating cannot be assumed without product-specific data.

Likewise, the aluminum/aluminum configuration should not automatically be considered equivalent in strength or installation behavior.

Engineering Solution 6 — Lightweight Design and Material Compatibility

Aluminum rivet bodies may be useful in lightweight industrial assemblies.

However, the mass of a complete rivet depends on:

• Body alloy and geometry

• Mandrel material

• Mandrel dimensions

• Rivet length

• Head dimensions

• Retained mandrel portion

For an accurate lightweighting comparison, engineers should compare complete installed fastener mass rather than simply comparing aluminum and steel material densities.

Where aluminum rivets are installed in aluminum panels, material compatibility may be favorable, but the actual alloy combinations and operating environment must still be assessed.

Engineering Solution 7 — Galvanic Corrosion and Environmental Exposure

Aluminum and steel can behave differently when exposed to moisture or other conductive environments.

For aluminum-body rivets with steel mandrels, engineers should evaluate:

• Aluminum alloy

• Steel mandrel grade

• Mandrel surface coating

• Retained mandrel exposure

• Moisture and condensation

• Contact with dissimilar materials

• Installation damage

• Service temperature

Closed-end construction may reduce some exposure pathways but does not eliminate every corrosion mechanism.

No particular salt spray performance or corrosion service life is claimed without supporting data.

Engineering Solution 8 — Grip Range and Installation

The combined thickness of the joined materials must remain within the specified grip range.

Important parameters include:

• Rivet diameter

• Rivet body length

• Minimum grip thickness

• Maximum grip thickness

• Hole diameter

• Countersink geometry

• Blind-side clearance

• Mandrel configuration

A compatible blind riveting tool and nosepiece are required.

Typical Installation Procedure

1. Confirm the rivet material configuration and dimensions.

2. Verify the total material stack-up.

3. Prepare the mounting hole according to the approved drawing.

4. Produce the matching 120° countersink.

5. Inspect hole diameter, countersink depth and burr condition.

6. Align the joined components.

7. Insert the closed-end rivet.

8. Seat the countersunk head.

9. Engage the mandrel using a compatible riveting tool.

10. Pull the mandrel to form the blind-side retaining portion.

11. Complete the setting operation.

12. Inspect head seating, blind-side formation and mandrel break condition.

13. Conduct leakage testing where specified.

Engineering Solution 9 — Mechanical Strength and Mandrel Retention

Shear strength, tensile strength and mandrel retention are separate technical characteristics.

The installed joint must be evaluated according to:

• Rivet diameter

• Material grades

• Grip thickness

• Hole geometry

• Countersink dimensions

• Blind-side formation

• Retained mandrel condition

• Panel stiffness

• Vibration and fatigue

• Environmental exposure

Certain proprietary closed-end rivet systems have verified mandrel-retention features.

However, those characteristics cannot be assigned to this JUXIN product without the applicable drawing or test evidence.

Engineering Solution 10 — Metric and Inch Diameter Reference

Common nominal blind rivet diameter references include:

These are general nominal references, not a confirmed list of available sizes for this product.

Metric and inch-designated rivets must be verified for actual dimensions, grip range, hole requirements and countersunk geometry before substitution.

Special Engineering Application — How to Select Blind Rivets for EV Battery Pack Cooling Plate Fixing

EV Battery Thermal Management and Lightweight Assembly

Modern electric vehicle battery systems commonly incorporate aluminum housings, cooling plates, structural supports and thermal management components.

Battery cold plates transfer heat from battery modules to a liquid-cooling circuit.

The thermal management system must maintain suitable operating conditions while meeting vehicle requirements for mechanical integrity, durability and manufacturing efficiency.

Blind riveting may be considered for selected noncritical mounting brackets, auxiliary covers and positioning components where one-sided access is beneficial.

However, rivets should not be introduced into a coolant-carrying wall or fluid channel without a specifically engineered and validated joint design.

Structural Characteristics of EV Battery Enclosures

Depending on the vehicle and battery pack design, assemblies may include:

• Aluminum battery housings

• Stamped or formed aluminum cooling plates

• Cooling channels and fluid manifolds

• Mounting brackets

• Reinforcement structures

• Thermal interface materials

• Electrical isolation components

• Multiple mechanical fastening points

These components may experience vibration, thermal expansion, manufacturing variation and service loads.

The fastener must be selected according to the actual function of the joint.

EV Engineering Requirement 1 — Structural Load and Fatigue

Blind rivets used for approved auxiliary attachments must withstand the specified mechanical loads.

Relevant considerations include:

• Static shear loads

• Tensile loads

• Vibration

• Fatigue

• Thermal cycling

• Joint stiffness

• Installation consistency

A closed-end aluminum blind rivet should not automatically be classified as an automotive structural rivet.

Its suitability must be demonstrated against the actual joint requirements.

EV Engineering Requirement 2 — Lightweight Construction

Reducing component mass is important in electric vehicle design.

Aluminum-body rivets may support lightweighting objectives in suitable assemblies.

However, a complete aluminum/steel rivet and a complete aluminum/aluminum rivet can have different masses and mechanical characteristics.

For OEM design decisions, compare:

• Complete installed rivet mass

• Required rivet quantity

• Joint performance

• Assembly process

• Total system cost

The lightest individual fastener is not necessarily the best overall joint solution.

EV Engineering Requirement 3 — Aluminum Panel Compatibility

Aluminum battery housings and cooling-related brackets may require fasteners compatible with the selected aluminum alloys.

Engineers should evaluate:

• Material combinations

• Galvanic corrosion

• Surface coatings

• Hole preparation

• Panel thickness

• Countersink depth

• Joint stiffness

• Thermal expansion

For thin cooling plates, countersinking may remove material needed for structural support or fluid-channel integrity.

Therefore, the 120° countersunk design must be evaluated against the actual cooling plate geometry.

EV Engineering Requirement 4 — Cooling Circuit Leak Integrity

The closed-end rivet body helps restrict leakage through the mandrel passage.

However, this does not establish that a riveted cooling plate or battery enclosure is leak-tight.

The cooling circuit may require:

• Fluid-channel isolation

• Approved joining methods

• Suitable sealing elements

• Pressure and leakage testing

• Thermal cycling validation

• Production process controls

A rivet hole must not compromise the cooling channel.

Where a mechanical fastener is used near a fluid boundary, the design must provide appropriate separation from the coolant passage or use a separately qualified sealing arrangement.

EV Engineering Requirement 5 — One-Sided Installation and Production Efficiency

Blind rivets can be useful where rear-side tool access is limited.

Potential manufacturing benefits include:

• One-sided setting

• Repeatable assembly operations

• Compatibility with selected sheet-metal joints

• Reduced need for rear-side fastening access

• Potential automation with suitable tooling

Actual productivity depends on the rivet, tooling, access conditions and assembly design.

EV Engineering Requirement 6 — Corrosion and Condensation

Even internal battery pack components may experience moisture-related risks.

Potential exposure can arise from:

• Condensation

• Temperature cycling

• Environmental ingress

• Manufacturing contamination

• Coolant leakage

• Service conditions

Material selection should not assume that an internal enclosure will remain permanently dry.

Corrosion requirements should be defined according to the vehicle manufacturer's actual operating and validation conditions.

EV Engineering Requirement 7 — Fastener Selection by Joint Function

EV Engineering Requirement 8 — OEM Validation and Quality Control

For an EV-related project, a suitable validation plan may include:

1. Confirm the function of the joint.

2. Review the 2D/3D assembly drawings.

3. Identify whether the joint intersects a fluid boundary.

4. Verify panel thickness and countersink geometry.

5. Select the material and mandrel configuration.

6. Confirm the grip range and mounting-hole dimensions.

7. Validate installation using production tooling.

8. Evaluate mechanical and vibration performance.

9. Evaluate corrosion and thermal cycling requirements.

10. Conduct leakage testing where applicable.

11. Define inspection and traceability requirements.

12. Obtain customer engineering approval before production release.

Automotive-specific documentation, including PPAP where required, should be discussed and agreed for each project rather than assumed to be available.

Industrial Applications & Engineering Fastening Solutions

Beyond EV battery assemblies, 120° countersunk closed-end aluminum blind rivets may be considered for a range of industrial applications.

1. AI Data Center Cabinets and Cooling Equipment

Potential applications include approved auxiliary aluminum panels, protective covers and equipment housings.

The closed-end design may help restrict leakage through the rivet body, while the countersunk head may reduce interference with adjacent components.

For liquid-cooling equipment, coolant containment and pressure integrity require separate validation.

2. Power Electronics and Electrical Equipment

Power conversion equipment, control cabinets and electrical housings may require low-profile mechanical connections.

Engineers should evaluate electrical bonding, insulation, corrosion, head clearance and serviceability.

3. Telecommunications Equipment

Outdoor and indoor telecommunications enclosures may use lightweight metal panels.

Closed-end rivets may be considered where reduced through-fastener moisture passage is desirable.

Complete enclosure ingress protection requires separate verification.

4. Automotive OEM and Tier-1 Manufacturing

Potential applications include noncritical sheet-metal covers, auxiliary brackets and lightweight equipment housings.

Vibration, fatigue, corrosion and customer-specific engineering requirements must be validated.

5. Motorcycle and Racing Vehicle Manufacturing

Aluminum closed-end countersunk rivets may be evaluated for suitable noncritical panels and protective covers.

Weight, vibration, fatigue and installation access should be considered.

6. Rail Transit Equipment

Rail equipment may include auxiliary aluminum panels and electrical enclosures.

Project-specific vibration, fatigue, fire and smoke, traceability and approval requirements must be evaluated.

7. Container Manufacturing

Auxiliary container compartments, lightweight covers and equipment housings may benefit from reduced head projection and closed-end construction.

Outdoor corrosion and structural loading require separate evaluation.

8. Energy Storage Systems

Energy storage cabinets may use aluminum auxiliary panels and protective covers.

Engineers should evaluate thermal movement, electrical isolation, corrosion and enclosure sealing requirements.

9. Semiconductor Equipment

Auxiliary cabinets and non-process-critical covers may require controlled head projection and one-sided fastening.

Cleanliness, installation debris and material compatibility should be evaluated.

No cleanroom or process-chamber qualification is implied.

10. Medical Equipment

Approved non-patient-contact instrument housings and auxiliary covers may use countersunk blind rivets where permanent fastening is acceptable.

Cleaning, corrosion, traceability and applicable regulatory requirements must be evaluated.

11. Food Processing Machinery

Non-product-contact guards and auxiliary equipment covers may be candidates for suitable aluminum closed-end rivets.

Hygienic design, cleaning compatibility and corrosion requirements must be reviewed.

No direct food-contact suitability is claimed.

12. Marine Equipment

Lightweight auxiliary housings and covers may require corrosion-resistant fastening solutions.

Aluminum alloy, steel mandrel exposure, galvanic compatibility and chloride conditions must be assessed.

Marine suitability is not automatic.

13. HVAC Equipment

HVAC housings and protective panels may require low-profile fasteners and controlled moisture pathways.

Condensation, vibration, corrosion and air leakage requirements should be evaluated.

14. Electronics and Electrical Appliances

Thin metal housings, equipment covers and protective panels may use countersunk closed-end rivets where appropriate.

Head clearance, installation consistency and maintenance access are important.

15. Outdoor Equipment and Leisure Products

Lightweight metal covers, accessory housings and auxiliary brackets may be considered.

Weather exposure, corrosion, vibration and joint loading require evaluation.

16. Aerospace Ground-Support Equipment

Nonflight-critical tooling covers, auxiliary cabinets and ground-support equipment may use approved mechanical fasteners.

No aircraft structural, flight-critical or aerospace-qualified application is claimed.

Production Engineering — Common Installation Problems

International Standards and Technical References

ISO 15974 is a relevant technical reference for closed-end blind rivets with countersunk heads and aluminum-alloy bodies with steel mandrels.

However, product conformity must be established using the applicable standard edition, actual material grades, dimensions and mechanical requirements.

The aluminum-body/aluminum-mandrel configuration requires separate standard applicability review.

ISO 15975 covers a protruding-head aluminum/aluminum closed-end configuration and should not automatically be cited as proof of conformity for a 120° countersunk product.

For EV battery assemblies, relevant vehicle and battery-pack requirements may include vibration, thermal cycling, corrosion and leakage evaluation.

SAE J3277 provides technical information concerning liquid leak-tightness evaluation for EV battery packs, but it does not establish certification of an individual JUXIN rivet.

The approved engineering drawing and customer specification remain the controlling technical references.

OEM Procurement and Supplier Development

For purchasing managers, supplier development engineers, manufacturing engineers and supply chain managers, technical qualification should distinguish between the two mandrel material configurations.

A complete sourcing evaluation should address:

• Aluminum body alloy and temper

• Steel or aluminum mandrel material

• Rivet diameter and length

• 120° countersunk head dimensions

• Grip range

• Mounting-hole and countersink requirements

• Mechanical performance

• Mandrel retention

• Corrosion requirements

• Sealing requirements

• Installation tooling

• Drawing revision

• Inspection and traceability

• Packaging specifications

• Expected annual demand

A visually similar closed-end rivet from another supplier is not automatically interchangeable.

Frequently Asked Questions

What is a 120° countersunk closed-end aluminum blind rivet?

It is a blind rivet with an aluminum closed-end body and a 120° countersunk head, designed for one-sided installation and reduced head projection.

What mandrel materials are available in the original product specification?

The original product information identifies steel and aluminum mandrel configurations.

What is the advantage of a closed-end rivet?

Its closed cup-shaped body helps restrict leakage through the mandrel passage.

Are closed-end blind rivets completely waterproof?

Not automatically. Complete joint sealing depends on hole geometry, installation and the assembly sealing design.

Can these rivets be used in EV battery enclosures?

They may be evaluated for suitable noncritical auxiliary assemblies, subject to OEM engineering approval.

Can a closed-end rivet be installed directly through a liquid-cooling channel?

Not without a specifically engineered and validated fluid-boundary design.

Is an aluminum/steel rivet stronger than an aluminum/aluminum rivet?

Not necessarily in every performance category. Actual strength depends on the complete product design and verified mechanical data.

Are aluminum/steel and aluminum/aluminum rivets interchangeable?

Not automatically. Dimensions, grip range, installation requirements and mechanical performance must be checked.

Can a 120° countersunk rivet replace a 90° or 100° countersunk rivet?

Only after confirming compatible head geometry and joint requirements.

Does this product comply with ISO 15974?

ISO 15974 is a relevant reference for the aluminum/steel configuration, but conformity for this JUXIN product has not been established from the available information.

Can JUXIN review custom closed-end blind rivet drawings?

Customer-specific drawings, material combinations, grip ranges and performance requirements can be submitted for engineering review and quotation.

Request an OEM 120° Countersunk Closed-End Aluminum Blind Rivet Quotation

JUXIN FASTENERS supplies industrial blind rivets for OEM manufacturing, sheet-metal fabrication and bulk purchasing projects.

For technical evaluation and quotation, please provide:

• Rivet body diameter and length

• 120° countersunk head diameter and height

• Aluminum body alloy and temper requirements

• Steel or aluminum mandrel selection

• Minimum and maximum material stack-up

• Mounting-hole diameter and tolerance

• Countersink diameter and depth

• 2D engineering drawings or 3D CAD files

• Required shear and tensile performance

• Mandrel retention requirements

• Corrosion and environmental requirements

• Sealing and leakage requirements

• Installation tooling and inspection requirements

• EV battery application details, if applicable

• Packaging specifications

• Expected order quantity and annual demand forecast

• Target delivery schedule

Email: info@juxinfasteners.com

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

JUXIN FASTENERS — 120° Countersunk Closed-End Aluminum Blind Rivets and Custom OEM Fastening Solutions.

Packaging Standard

At Juxin Fasteners, we apply standardized export packaging to ensure product protection, traceability, and compliance with international logistics requirements.

1. Standard Export Packaging

Unless otherwise specified, all products will be packed according to our factory standard export packaging, which includes:

Moisture-resistant inner protection

Poly bag or small box packing as required

Reinforced export cartons

Clear labeling with part number, specification, batch number, and quantity

Palletizing for sea or air shipment when necessary

Our standard packaging is designed to ensure safe transportation, efficient warehousing, and long-distance international shipping.

2. Customized Packaging Options

We also provide customized packaging solutions according to customer requirements, including but not limited to:

Private labeling

Customized barcodes

Specific carton dimensions

Retail packaging

Special pallet configuration

Customer-specific marking and identification

So that you know, customized packaging may involve additional costs and extended lead time depending on the complexity of the requirements.

3. Compliance & Quality Assurance

All packaging processes are controlled under our ISO 9001 quality management system to ensure consistency, traceability, and product integrity throughout the supply chain.