120° Countersunk Closed-End Stainless Steel Blind Rivets

120° Countersunk Closed-End Stainless Steel Blind Rivets for OEM Sealing and Flush-Mount Assemblies

Product Overview

JUXIN FASTENERS supplies 120° countersunk closed-end stainless steel blind rivets for OEM sheet-metal fabrication, industrial equipment enclosures, vehicle components and other permanent fastening applications requiring one-sided installation.

This product features a 300-series stainless steel rivet body, a stainless steel pull mandrel and a 120-degree countersunk head.

The closed-end construction is designed to reduce potential leakage through the rivet body, while the countersunk head allows a flush or near-flush installation when used with a correctly prepared mating countersink.

Unlike conventional open-end blind rivets, closed-end designs use a sealed blind-end rivet body to limit the through-body passage of moisture, air and contaminants.

However, the closed-end construction alone does not guarantee that the entire installed joint is watertight or airtight.

The actual sealing performance depends on rivet geometry, hole tolerances, countersink fit, mating surfaces, installation quality and the required environmental conditions.

Product Identification and Technical Specifications

Key Product Features

• 300-series stainless steel rivet body

• Stainless steel pull mandrel

• Closed-end blind rivet construction

• 120° countersunk head

• Flush-mount fastening capability

• One-sided mechanical installation

• Reduced potential leakage through the rivet body

• Defined grip range for controlled material stack-up

• Stainless steel material options for corrosion-sensitive assemblies

• Permanent mechanical fastening

• Compatibility with approved riveting tools

• Drawing-based OEM technical specifications

Actual mechanical strength, sealing effectiveness and corrosion resistance must be verified for the selected part number.

Product Dimensions and Engineering Data

Technical Documentation

For exact product dimensions, available sizes, head geometry and detailed technical information, refer to the original JUXIN product PDF/CAD, pages 107–108.

Customer-specific dimensions and configurations may be submitted for engineering feasibility review.

Engineering Solution 1 — What Is a Closed-End Blind Rivet?

A closed-end blind rivet uses a rivet body with a closed blind end.

During installation, the pull mandrel deforms the rivet body to form the retaining portion on the inaccessible side of the joint.

The closed-end construction differs from an open-end blind rivet, where a potential passage through the rivet body may remain.

Closed-end designs are commonly considered where the assembly requires improved resistance to moisture, air or contaminant passage through the fastener.

However, leakage may still occur around the mounting hole, beneath the head or between the connected panels.

The complete installed joint must therefore be evaluated.

Engineering Solution 2 — 120° Countersunk Head vs. Dome Head

The head style is a critical difference between this product and conventional dome head blind rivets.

A 120° countersunk rivet must not be installed into a countersink prepared for a different head angle without engineering verification.

Engineering Solution 3 — Countersink Geometry and Flush-Mount Design

A properly designed countersink supports the rivet head and allows the required installed surface profile.

Important dimensions include:

• Countersink angle

• Countersink major diameter

• Countersink depth

• Rivet head diameter

• Rivet head height

• Mounting-hole diameter

• Panel thickness

• Remaining material beneath the countersink

Excessive countersink depth may reduce the remaining panel thickness and weaken the joint.

Insufficient countersink depth may leave the rivet head protruding.

A mismatched angle may cause incomplete head seating and uneven contact pressure.

The countersink should be prepared according to the approved rivet and assembly drawings.

Engineering Solution 4 — Closed-End Sealing Mechanism

The closed-end rivet body helps limit leakage through the fastener itself.

This may be valuable in industrial enclosures and other applications where moisture or contamination is a concern.

However, the installed assembly contains multiple possible leakage paths:

1. Through the rivet body

2. Between the rivet body and mounting hole

3. Beneath the countersunk head

4. Between overlapping panels

5. Through adjacent gaps or damaged surfaces

A closed-end rivet primarily addresses the through-body leakage path.

Additional joint design measures may be required to control the other leakage paths.

Engineering Solution 5 — Water Resistance vs. Watertight Performance

The terms water-resistant, watertight and waterproof should not be used interchangeably.

A closed-end rivet may improve resistance to water passage through the rivet body.

A fully watertight joint requires verification of the complete assembly under defined conditions.

Relevant test parameters may include:

• Water pressure

• Exposure duration

• Spray direction

• Temperature

• Joint orientation

• Surface condition

• Installation quality

No universal watertight pressure rating is claimed for this product.

Engineering Solution 6 — Air Leakage and Pressure Boundaries

Closed-end rivets may reduce potential air leakage through the fastener body.

However, they should not automatically be treated as airtight fasteners or pressure-rated components.

For applications involving air leakage limits, engineers should define:

• Permissible leakage rate

• Pressure differential

• Test duration

• Test medium

• Operating temperature

• Joint geometry

• Inspection criteria

Pressure vessels, pressurized piping and regulated pressure boundaries require separate design and qualification.

Engineering Solution 7 — Stainless Steel Material Selection

The original product information specifies a 300-series stainless steel rivet body and stainless steel mandrel.

The 300 series includes several stainless steel grades with different corrosion and mechanical characteristics.

The description does not identify one exact grade.

Therefore, the following details should be confirmed:

• Rivet body alloy

• Mandrel alloy

• Material condition

• Mechanical properties

• Corrosion requirements

• Surface condition

• Traceability requirements

The rivet body and mandrel may use different stainless steel grades to meet their respective forming and pulling requirements.

Engineering Solution 8 — Understanding 18-8 Stainless Steel

The term 18-8 stainless steel is commonly associated with austenitic stainless steels containing approximately 18% chromium and 8% nickel.

It is widely used in industrial fastener descriptions.

However, 18-8 is not an exact substitute for every 300-series stainless steel grade.

A material requirement such as AISI 304, AISI 305 or AISI 316 must be confirmed individually.

The original product information does not establish the exact JUXIN body or mandrel grade.

Engineering Solution 9 — Stainless Steel Corrosion Resistance

Stainless steel can provide useful corrosion resistance in suitable operating environments.

However, stainless steel is not immune to corrosion.

Potential concerns include:

• Pitting corrosion

• Crevice corrosion

• Chloride exposure

• Surface contamination

• Galvanic corrosion

• Chemical exposure

Closed-end geometry does not eliminate corrosion risk at the head, mounting hole or panel interface.

For outdoor or chemically exposed equipment, the stainless steel grades must be matched to the actual service environment.

No salt spray rating or corrosion service life is claimed without verified test data.

Engineering Solution 10 — Magnetic Behavior of Stainless Steel Rivets

Some 300-series stainless steel components may exhibit a degree of magnetic response after cold working.

Magnetic response alone is not a reliable method for identifying the exact stainless steel grade.

For applications requiring controlled magnetic properties, the requirement should be included in the engineering specification.

No nonmagnetic or magnetic performance guarantee is made without testing.

Engineering Solution 11 — Grip Range Selection

The grip range defines the permitted combined thickness of the connected materials.

The selected rivet must accommodate the complete material stack-up.

Relevant factors include:

• Minimum panel thickness

• Maximum panel thickness

• Intermediate layers

• Manufacturing tolerances

• Coatings

• Rivet body length

• Blind-side formation

An incorrect grip range may prevent proper setting and reduce joint integrity.

Engineering Solution 12 — Hole Diameter and Sealing Reliability

Mounting-hole dimensions affect both mechanical performance and sealing behavior.

Engineers should verify:

• Minimum hole diameter

• Maximum hole diameter

• Hole roundness

• Hole alignment

• Burr condition

• Panel deformation

• Surface contamination

• Countersink quality

Oversized, cracked or damaged holes should not be accepted unless specifically approved by the responsible engineer.

A closed-end rivet cannot compensate for every hole defect.

Engineering Solution 13 — Shear Strength

Shear loading acts primarily across the rivet and joint interface.

Shear capacity depends on:

• Rivet diameter

• Rivet body material

• Mandrel material

• Rivet geometry

• Retained mandrel position

• Grip thickness

• Hole diameter

• Installation quality

The complete joint may fail through fastener shear, panel bearing or other mechanisms.

Actual shear values must be verified for the selected product.

Engineering Solution 14 — Tensile Strength and Pull-Through

Tensile loading acts primarily along the fastener axis.

Relevant failure mechanisms include:

• Rivet body fracture

• Mandrel retention failure

• Head-side pull-through

• Blind-side pull-through

• Panel deformation

• Local material failure

Countersunk head geometry can influence head-side pull-through resistance.

The remaining panel thickness beneath the countersink must be considered.

No numerical tensile performance is claimed without verified data.

Engineering Solution 15 — Mandrel Retention

The original product description refers to a retained mandrel.

However, retained mandrel behavior depends on the specific rivet design.

A closed-end body does not automatically establish a particular mechanical locking mechanism.

Engineers should confirm:

• Mandrel break position

• Retained mandrel geometry

• Retention mechanism

• Inspection requirements

• Tool compatibility

• Relevant vibration requirements

No guarantee that the mandrel can never loosen is made without supporting qualification.

Engineering Solution 16 — Installation Tooling and Nosepiece Selection

A compatible blind riveting tool and nosepiece are required.

Tool selection should consider:

• Rivet diameter

• Mandrel diameter

• Required pulling force

• Tool stroke

• Nosepiece geometry

• Head access

• Production cycle time

• Mandrel collection

• Installation monitoring

The tool must be suitable for the selected stainless steel rivet configuration.

Typical Installation Procedure

1. Confirm the approved rivet part number.

2. Verify the rivet body and mandrel material specifications.

3. Confirm the combined material thickness.

4. Select the correct grip range.

5. Prepare the mounting hole.

6. Machine or form the approved 120° countersink.

7. Remove burrs and inspect the seating surface.

8. Select the compatible riveting tool and nosepiece.

9. Insert the rivet from the accessible side.

10. Confirm that the countersunk head seats correctly.

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

12. Complete the mandrel break.

13. Inspect the head position and installed joint.

14. Perform sealing verification where required.

15. Confirm acceptance against the approved engineering specification.

Engineering Solution 17 — Sealing Materials and Additional Joint Protection

Some applications may require additional sealing measures around the riveted joint.

These may include approved sealants, gaskets or other assembly-level sealing features.

Any additional material must be compatible with:

• Stainless steel

• Mating panel materials

• Coatings

• Operating temperature

• Moisture exposure

• Chemicals

• Assembly process

The use of sealant should not be assumed necessary or acceptable for every application.

Engineering Solution 18 — Metric and Inch Diameter Reference

Common nominal blind rivet diameter references include:

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

Actual metric and inch-designated rivets must be checked for dimensions, tolerances, grip ranges, countersink geometry and tooling compatibility before substitution.

Industrial Applications and Engineering Solutions

120° countersunk closed-end stainless steel blind rivets may be evaluated for OEM assemblies requiring flush-head fastening, one-sided access and controlled leakage paths.

The following are potential engineering applications, not product-specific certifications or approvals.

1. Industrial Sheet-Metal Enclosures

Industrial enclosures may use stainless steel covers, protective panels and auxiliary brackets.

Closed-end countersunk rivets may be considered where a flush surface and reduced leakage through the fastener body are desirable.

Joint sealing and mechanical performance must be verified.

2. Electrical Equipment Cabinets

Electrical cabinets may require flush-head fastening for covers, brackets and protective housings.

Closed-end stainless steel rivets may be evaluated for suitable mechanical connections.

Electrical bonding, moisture protection and equipment qualification requirements must be considered.

3. AI Data Center Equipment

AI data center infrastructure may incorporate power cabinets, cooling equipment housings and protective sheet-metal panels.

Closed-end countersunk rivets may be considered for suitable enclosure connections requiring limited head projection.

Condensation, corrosion, electrical requirements and serviceability must be evaluated.

4. Liquid Cooling Equipment Housings

Liquid cooling equipment may contain protective covers, auxiliary panels and external housings.

Closed-end rivets may be evaluated for suitable non-pressure-boundary connections.

They should not be assumed suitable for coolant pressure containment or leak-critical fluid passages.

5. Telecommunications Equipment

Telecommunications equipment may use outdoor stainless steel cabinets, protective covers and auxiliary brackets.

Closed-end countersunk rivets may be considered where surface clearance and moisture exposure are important.

Environmental sealing and corrosion requirements must be verified.

6. HVAC and Industrial Ventilation

HVAC equipment may include stainless steel housings, protective covers and auxiliary brackets.

Closed-end countersunk rivets may be evaluated for suitable permanent connections.

Condensation, vibration and maintenance requirements must be considered.

7. Commercial Vehicle Manufacturing

Commercial vehicles may incorporate stainless steel equipment housings, panels and auxiliary brackets.

Closed-end countersunk rivets may be considered where flush mounting and reduced moisture passage are useful.

Vibration, fatigue, corrosion and joint strength require validation.

8. Trailer and Container Equipment

Trailers and containers may use protective panels, equipment compartments and auxiliary metal structures.

Closed-end rivets may be evaluated for suitable enclosure connections.

Primary structural connections and required weather-sealing performance need separate engineering approval.

9. Automotive OEM Components

Automotive assemblies may require flush-head fastening of selected covers, brackets and metal panels.

Closed-end stainless steel rivets may be considered where approved by the product engineering specification.

Mechanical, corrosion and fatigue requirements must be satisfied.

10. Food Processing Equipment

Food-processing equipment may use stainless steel covers, guards and auxiliary housings.

Closed-end countersunk rivets may be evaluated for suitable non-product-contact mechanical connections.

Crevice corrosion, cleaning chemicals and hygienic design must be assessed.

No food-contact or hygienic certification is implied.

11. Medical Equipment Housings

Medical equipment may incorporate stainless steel covers, panels and protective enclosures.

Closed-end countersunk rivets may be considered for approved non-patient-contact assemblies.

Cleaning, corrosion, traceability and regulatory requirements must be reviewed.

12. Semiconductor Equipment

Semiconductor equipment may use stainless steel protective panels, cabinets and auxiliary housings.

Closed-end rivets may be considered for approved non-process-critical connections.

Cleanliness, particle generation, corrosion and maintenance requirements must be evaluated.

13. Energy Storage Equipment

Energy storage equipment may include stainless steel cabinets, protective panels and auxiliary brackets.

Closed-end countersunk rivets may be evaluated for suitable mechanical connections.

Electrical isolation, thermal conditions, vibration and environmental sealing require assessment.

14. Power Distribution Equipment

Power distribution equipment may use stainless steel cabinets, auxiliary brackets and protective covers.

Flush-head closed-end rivets may be considered where the approved design requires permanent one-sided fastening.

Electrical clearances, grounding and moisture protection must be reviewed.

15. Marine Auxiliary Equipment

Marine equipment may use stainless steel covers, protective housings and brackets.

Closed-end countersunk rivets require evaluation of the actual stainless steel grades, chloride exposure and crevice corrosion risks.

No seawater pressure-boundary or marine structural qualification is implied.

16. Industrial Machinery

Industrial machinery may use protective guards, covers and auxiliary sheet-metal housings.

Closed-end stainless steel rivets may be considered where permanent flush-head fastening is appropriate.

Vibration, impact, corrosion and serviceability must be reviewed.

17. Rail Transit Auxiliary Equipment

Rail equipment may contain stainless steel enclosures, protective panels and equipment covers.

Closed-end countersunk rivets may be considered only where permitted by the approved project specification.

Vibration, fatigue, fire and smoke, traceability and other relevant requirements must be addressed.

18. Custom OEM Sheet-Metal Assemblies

Custom OEM manufacturers may require stainless steel closed-end blind rivets with specified head geometry, grip range and sealing requirements.

JUXIN FASTENERS can review customer drawings and technical specifications for suitable product configurations and quotation.

Application Selection Matrix

Production Engineering and Quality Control

For production managers and manufacturing engineers, repeatable closed-end countersunk riveting requires control of both the rivet and the prepared mounting hole.

Important production characteristics include:

• Approved rivet part number

• Rivet body stainless steel grade

• Mandrel stainless steel grade

• Rivet diameter and length

• Countersunk head dimensions

• Countersink angle

• Countersink depth

• Mounting-hole diameter

• Grip range

• Panel thickness

• Surface condition

• Tool and nosepiece identification

• Installation force and stroke, where specified

• Head seating

• Blind-side formation

• Mandrel break condition

• Leakage testing, where required

• Inspection sampling

• Material traceability

Production trials should be completed where required before full-volume manufacturing.

Common Installation Problems and Engineering Checks

International Standards and Technical Qualification

Closed-end countersunk blind rivets may be specified using applicable product standards, manufacturer specifications and customer-approved engineering drawings.

The exact material combination, head angle, rivet construction and dimensional requirements determine which standard may apply.

A standard covering an open-end rivet or protruding-head rivet must not automatically be applied to a closed-end 120° countersunk product.

Technical qualification should establish:

• Rivet body material grade

• Mandrel material grade

• Head geometry

• Countersink angle

• Rivet dimensions and tolerances

• Grip range

• Mounting-hole requirements

• Shear and tensile performance

• Mandrel retention

• Installation tooling

• Corrosion requirements

• Joint sealing requirements

• Inspection criteria

Where ISO, DIN, EN, ASTM, SAE, IFI or customer-specific specifications apply, conformity must be verified against the actual product.

No unverified standard conformity or certification is claimed.

OEM Procurement and Supplier Development

For purchasing managers, supplier development engineers and supply chain managers, closed-end stainless steel blind rivets should be sourced using complete engineering requirements.

A technical RFQ should identify:

• Approved product drawing

• Rivet body stainless steel grade

• Mandrel stainless steel grade

• Rivet diameter and body length

• 120° countersunk head dimensions

• Countersink depth and diameter

• Minimum and maximum grip thickness

• Mounting-hole diameter and tolerance

• Required shear and tensile loads

• Sealing requirements

• Corrosion and environmental conditions

• Installation tooling

• Inspection and traceability

• Packaging

• Expected annual demand

The total installed cost should consider countersink preparation, tooling, assembly time, inspection, sealing verification and quality consistency rather than unit price alone.

Frequently Asked Questions

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

It is a stainless steel break-mandrel blind rivet with a closed blind-end body and a 120-degree countersunk head, designed for one-sided installation.

What is the difference between closed-end and open-end blind rivets?

Closed-end rivets use a sealed blind-end body to reduce potential leakage through the fastener, while open-end rivets have a different body construction.

Does a closed-end rivet create a watertight joint?

Not automatically. The complete joint must be designed and tested for the required sealing conditions.

Why use a 120° countersunk head?

It allows a flush or near-flush installation when the mating panel has a correctly prepared 120° countersink.

Can a 120° countersunk rivet replace a dome head rivet?

Only after engineering review of the head geometry, countersink, panel thickness and mechanical requirements.

Are these rivets made from 18-8 stainless steel?

The original product information specifies a 300-series stainless steel body and stainless steel mandrel. Exact grades must be confirmed.

Are the body and mandrel the same stainless steel grade?

Not necessarily. The body and mandrel grades should be specified separately.

Are these rivets corrosion-proof?

No. Corrosion resistance depends on the actual stainless steel grades and service environment.

Can these rivets be used in pressure vessels?

Not without separate engineering qualification for the pressure-boundary application.

Are these rivets suitable for vibration?

Suitability depends on the complete joint, mandrel retention and verified fatigue performance.

Can JUXIN review custom closed-end countersunk rivet requirements?

Customer drawings, dimensions, material specifications and sealing requirements can be submitted for technical review and quotation.

Request a 120° Countersunk Closed-End Stainless Steel Blind Rivet OEM Quotation

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

For technical review and quotation, please provide:

• 2D engineering drawing or 3D CAD model

• Rivet body stainless steel grade

• Mandrel stainless steel grade

• Rivet diameter and body length

• 120° countersunk head dimensions

• Countersink diameter and depth

• Minimum and maximum grip thickness

• Mounting-hole diameter and tolerance

• Required shear and tensile performance

• Sealing or leakage requirements

• Corrosion and environmental conditions

• Installation tooling and nosepiece requirements

• Inspection and traceability requirements

• Expected order quantity

• Annual demand forecast

• Packaging specifications

• Target delivery schedule

Email: info@juxinfasteners.com

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

JUXIN FASTENERS — 120° Countersunk Closed-End Stainless Steel Blind Rivets for Global OEM Manufacturing.

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.