Flat Head Closed-End Full-Hex Blind Rivet Nuts

Technical Specifications – Flat Head Closed-End Full-Hex Blind Rivet Nuts

1. General Technical Specifications

The supplied grip range applies to the product series. Individual grip ranges and installation dimensions must be verified using the relevant size-specific drawing.

2. Metric Thread Specifications

The thread pitches shown are ISO metric coarse-thread references. Final thread pitch and tolerance class must match the approved product drawing.

Relevant international references include:

• ISO 261 — ISO General-Purpose Metric Screw Threads

• ISO 965 — Tolerances for ISO Metric Screw Threads

• ISO 4042 — Electroplated Coating Systems for Fasteners

• ASTM B117 — Standard Practice for Operating Salt Spray Apparatus

Compliance with a particular standard must be confirmed against the ordered product specification and available documentation.

3. Full-Hexagonal Body Design

The full hexagonal body provides positive mechanical engagement with a matching hexagonal installation hole.

Anti-Rotation Performance

A correctly installed full-hex blind rivet nut resists rotation through geometric engagement with the workpiece.

This design can provide advantages over conventional round-body inserts in applications where resistance to torque-induced spinning is important.

Factors affecting torque-to-turn performance include:

• Hexagonal body dimensions

• Installation-hole across-flats dimensions

• Hole manufacturing tolerances

• Panel thickness

• Workpiece material strength

• Insert setting conditions

• Installed deformation

• Bolt tightening torque

Full-hex geometry does not eliminate the need to validate torque-to-turn performance for the actual joint.

Applications Requiring Anti-Rotation Resistance

Typical examples include removable equipment panels, electrical cabinet brackets, machine covers, and threaded connections requiring periodic servicing.

4. Closed-End Construction and Contamination Protection

The closed-end design incorporates an enclosed bottom rather than a through-hole.

This provides a physical barrier against direct contamination entering the threaded cavity from the rear of the insert.

Main Functional Advantages

• Protects the threaded cavity from direct backside exposure.

• Reduces the possibility of contamination entering through the insert bottom.

• Limits available bolt penetration depth.

• Provides an alternative to open-end rivet nuts in selected protected-thread applications.

• Supports fastening designs where rear-side contamination is a concern.

Watertight and Airtight Applications

Closed-end rivet nuts may be considered for equipment requiring resistance to moisture or contamination, including electrical enclosures, HVAC housings, and industrial containers.

However, a closed-end insert alone does not guarantee a watertight or airtight joint.

Potential leakage paths include:

• The interface between the flange and the workpiece

• Gaps around the installation hole

• Surface irregularities

• Coating defects

• Incorrect installation deformation

For sealing-critical applications, engineers should evaluate an appropriate under-head gasket or sealant and validate the completed assembly against the required leakage or ingress-protection criteria.

Where applicable, IEC 60529 may be used as a reference for enclosure ingress-protection testing.

5. Flat Head and Large-Flange Configuration

The flat-head configuration provides a bearing surface around the installation hole.

Compared with reduced-head designs, a larger flange may provide greater contact area and improve load distribution in suitable materials.

Engineering Advantages

• Increased bearing contact area

• Support around the installation opening

• Improved local load distribution

• Reduced risk of local flange pull-through under suitable loading conditions

• Suitable configuration for selected load-bearing threaded connections

The flange must be fully seated against the mounting surface after installation.

Flat Head vs. Countersunk Head

Flat-head large-flange rivet nuts normally sit above the workpiece surface.

Countersunk rivet nuts require a corresponding countersunk hole and are selected where a recessed head is required.

These designs should not be treated as dimensionally interchangeable.

6. Grip Range and Workpiece Thickness

Product Family Grip Range: 0.5–5.0 mm

The grip range refers to the workpiece thickness over which a specific rivet nut is designed to deform and retain correctly.

Important Selection Factors

Engineers should verify:

• Nominal workpiece thickness

• Thickness tolerance

• Coating thickness

• Material hardness

• Workpiece strength

• Insert body length

• Required backside clearance

• Installation setting stroke

Multiple-Sheet Assemblies

Where the insert is used to clamp or retain multiple sheets, the combined thickness and stack-up tolerances must fall within the approved grip range.

Thin Sheet Materials

Selected configurations may be suitable for material thicknesses starting at 0.5 mm.

However, suitability depends on the exact rivet nut size, panel material, and installation conditions.

7. Installation-Hole Requirements

Full-hex blind rivet nuts require a corresponding hexagonal mounting hole.

Critical Hole Dimensions

• Across-flats dimension

• Across-corners clearance

• Hole tolerance

• Panel thickness

• Hole edge condition

• Edge distance

• Hole alignment

The correct hole size must be obtained from the product-specific technical drawing.

Hexagonal Hole Production

Depending on the workpiece and production process, hexagonal holes may be manufactured through:

• Punching

• Broaching

• CNC machining

• Dedicated hexagonal hole-forming equipment

For certain applications, compatible hole-forming tools may allow a prepared round hole to be converted into a hexagonal opening.

Tool compatibility and dimensional requirements must be confirmed before production.

8. Installation Method and Setting Process

Closed-end full-hex rivet nuts are installed using compatible threaded-mandrel setting equipment.

The installation tool engages the internal thread of the rivet nut and applies axial pulling force.

This causes the designated deformable section of the rivet nut body to collapse behind the workpiece, creating mechanical retention.

Recommended Installation Procedure

Step 1 — Confirm Product Selection

Verify the thread size, grip range, body dimensions, and approved drawing.

Step 2 — Prepare the Mounting Hole

Produce the required hexagonal installation hole and remove excessive burrs.

Step 3 — Check Panel Thickness

Confirm that the workpiece thickness is within the specified grip range.

Step 4 — Engage the Setting Tool

Thread the compatible mandrel into the rivet nut.

Step 5 — Insert the Rivet Nut

Position the hexagonal body in the matching hole with the flange seated against the panel.

Step 6 — Apply Setting Force

Operate the installation tool using the approved setting stroke or force.

Step 7 — Release the Tool

Unthread the mandrel without damaging the installed insert.

Step 8 — Inspect the Installed Connection

Check flange seating, backside deformation, thread condition, and insert alignment.

Step 9 — Verify Mechanical Performance

Where required, perform torque-to-turn, pull-out, push-out, or application-specific tests.

9. Closed-End Bolt Length Selection

Unlike open-end rivet nuts, closed-end inserts have a limited internal depth.

The mating bolt must not bottom against the closed end before the joint reaches its intended clamping condition.

Important Engineering Checks

• Available internal thread depth

• Required thread engagement

• Bolt length

• Joint stack thickness

• Washer thickness

• Installation tolerances

• Available internal clearance

Why Bolt Length Matters

An excessively long bolt may contact the closed bottom before properly clamping the assembled components.

This can create misleading tightening resistance, damage the insert, or prevent the joint from achieving the intended clamp load.

Engineers should confirm the allowable bolt penetration using the approved product drawing.

10. Steel Material and Blue Zinc Surface Finish

Base Material

Steel provides mechanical strength for industrial threaded fastening applications.

The exact steel grade and mechanical properties should be confirmed according to the ordered product specification.

Standard Surface Finish

RoHS Blue Zinc

The product is specified with a blue zinc-plated finish.

The zinc coating provides sacrificial corrosion protection to the steel substrate.

Actual corrosion resistance depends on:

• Zinc coating thickness

• Passivation system

• Coating quality

• Exposure environment

• Surface damage

• Storage and handling conditions

RoHS Compliance

Where RoHS compliance is required, the relevant plating and passivation documentation should be confirmed for the supplied product.

ASTM B117 Corrosion Testing

ASTM B117 may be used to evaluate coating performance under controlled salt-spray exposure.

A specific salt-spray duration or red-rust resistance rating should only be stated when supported by the applicable coating specification and test results.

Alternative Materials and Finishes

Depending on engineering requirements, alternative configurations may be reviewed, including:

• A2 stainless steel

• A4 stainless steel

• Aluminum

• Alternative zinc-plated finishes

• Customer-specified protective coatings

These are potential material and finish options, not confirmed stock specifications for the displayed steel product.

11. Mechanical Performance Considerations

Torque-to-Turn Resistance

Measures the resistance of the installed insert to rotation within the workpiece.

Pull-Out Resistance

Measures resistance to axial extraction of the installed insert.

Push-Out Resistance

Evaluates resistance to displacement under loading in the relevant direction.

Thread Strength

Depends on the insert material, thread geometry, thread engagement, and mating bolt specification.

Joint Reliability

The final connection performance depends on the complete assembly, not only the rivet nut.

Engineering validation should consider:

• Bolt strength

• Insert strength

• Panel strength

• Hole dimensions

• Setting conditions

• Clamp load

• Service vibration

• Corrosion exposure

• Maintenance requirements

12. Industrial Application Solutions

Electrical Cabinets and Switchgear

Closed-end full-hex rivet nuts can provide protected threaded fastening points for:

• Internal mounting rails

• Equipment brackets

• Removable panels

• Component supports

• Service-access covers

Where enclosure ingress protection is required, sealing performance must be validated at the assembly level.

Telecommunications Equipment

The combination of anti-rotation geometry and one-sided installation can support fastening in confined metal cabinets and equipment housings.

HVAC Equipment

Potential applications include equipment panels, brackets, and selected housings where backside access is limited.

Industrial Containers and Tanks

Closed-end rivet nuts may be considered for selected container or tank fastening points.

For pressure-retaining, liquid-containing, or safety-critical applications, additional sealing, structural analysis, and validation are essential.

Industrial Machinery

Full-hex inserts provide reusable threaded fastening points for covers, brackets, and maintenance-access components.

Transportation Equipment

The design may be evaluated for fabricated panels, equipment housings, and non-critical mounting applications where vibration and repeated maintenance are relevant.

13. Open-End vs. Closed-End Blind Rivet Nuts

For applications requiring protection against moisture, dirt, or fluid ingress, closed-end inserts may offer advantages over open-end configurations.

However, the complete fastening interface must still be evaluated.

14. Full-Hex vs. Round-Body Rivet Nuts

Full-Hex Body

The full-hex body engages mechanically with the corresponding hole, providing resistance to rotation.

Round Body

Round-body rivet nuts are installed in circular holes and may be more convenient where standard drilling operations are preferred.

Selection Guidance

Full-hex designs are particularly relevant where:

• High torque-to-turn resistance is required.

• Repeated bolt removal is expected.

• The workpiece can accommodate a hexagonal hole.

• Mechanical anti-rotation engagement is a priority.

Round-body designs may be preferred where manufacturing simplicity or circular-hole compatibility is more important.

15. OEM Customization and Drawing-Based Supply

JUXIN FASTENERS can review special requirements for:

• Custom metric or imperial threads

• Special grip ranges

• Modified body lengths

• Different flange dimensions

• Alternative hexagonal body geometry

• Special closed-end depths

• Alternative materials

• Customer-specific surface finishes

• Sealing-related design requirements

• Custom inspection criteria

• OEM packaging and labeling

Non-standard configurations are subject to technical review, manufacturing feasibility, tooling requirements, and minimum order quantities.

16. Technical Drawings and CAD Reference

Product Catalogue: PDF Pages 97–98

Please refer to the corresponding detailed specification sheet and available CAD drawings for exact dimensions.

The following information should be confirmed:

• Thread size and pitch

• Flange diameter

• Flange thickness

• Body length

• Hexagonal across-flats dimension

• Installation-hole dimensions

• Grip range

• Closed-end internal depth

• Dimensional tolerances

Customers may submit PDF drawings, 2D engineering drawings, or 3D CAD files for review.

17. OEM Purchasing and RFQ Checklist

Key Product Features and Benefits

Full-Hex Anti-Rotation Design

The hexagonal body mechanically engages with a corresponding hexagonal hole, providing resistance to unwanted rotation during assembly and servicing.

This is particularly valuable for applications requiring repeated bolt installation and removal.

Closed-End Thread Protection

The closed bottom prevents direct passage through the rear of the threaded insert, helping protect the threaded cavity from contamination originating behind the workpiece.

For applications requiring a watertight or airtight joint, an appropriate under-head sealing system and validated installation conditions are necessary.

Reliable Internal Threads in Thin Materials

The rivet nut provides a steel female thread in materials that may be too thin for conventional thread tapping.

Large-Flange Bearing Support

The flat flange increases the bearing contact area against the workpiece and helps distribute local loads around the mounting hole.

Single-Sided Installation

The rivet nut can be installed entirely from the accessible side of a workpiece without requiring a separate backing nut.

Blue Zinc-Plated Steel

The steel construction provides mechanical strength, while the blue zinc finish offers corrosion protection according to the specified plating and passivation system.

OEM Customization

Special thread dimensions, body lengths, grip ranges, surface finishes, and drawing-based configurations can be reviewed according to customer requirements.

Typical Industrial Applications

• Electrical cabinets and switchgear enclosures

• Telecommunications cabinets and control panels

• Industrial equipment housings

• Sheet-metal fabrication assemblies

• HVAC equipment panels

• Machinery covers and mounting brackets

• Transportation equipment enclosures

• Tubular steel assemblies

• Service-access panels

• Industrial containers and selected equipment housings

Engineering and Procurement Support

JUXIN FASTENERS supports design engineers, purchasing managers, OEM sourcing teams, and supplier development professionals in selecting suitable threaded fastening components.

Important selection criteria include thread size, grip range, installation-hole geometry, torque-to-turn resistance, pull-out performance, corrosion protection, and any required environmental sealing.

Our focus is not simply supplying fasteners, but helping customers solve engineering and sourcing challenges through appropriate product selection, clear technical communication, and dependable service.

Request a Quotation

For standard or custom closed-end full-hex blind rivet nuts, please provide:

• Required thread size

• Workpiece material and thickness

• Installation-hole dimensions

• Required mechanical performance

• Surface finish

• Technical drawing or CAD file

• Estimated order quantity

• Annual purchasing forecast

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

JUXIN FASTENERS — Industrial Fastening and Custom Component Solutions.

Product Packaging – Closed-End Full-Hex Blind Rivet Nuts

Standard Industrial Packaging

JUXIN FASTENERS provides industrial packaging for closed-end full-hex blind rivet nuts to support OEM purchasing, bulk shipment, warehouse storage, and industrial distribution.

The standard packaging system consists of plastic inner bags, outer cartons, and pallet arrangements for larger shipments.

Packaging quantities and configurations can be adjusted according to product dimensions, thread sizes, shipment quantities, and customer requirements.

1. Inner Packaging – Plastic Bags

The standard inner packaging consists of plastic bags.

Blind rivet nuts are packed according to the confirmed order quantity and packaging requirements.

Inner Packaging Options

• Standard plastic bag packaging

• Separate packaging by thread size

• Separate packaging by product type

• Customer-defined quantities per bag

• Batch identification where required

• OEM part-number identification

• Special packaging instructions upon request

Inner Packaging Label Information

Where required, inner bag labels may include:

• Product name

• Thread size

• Material

• Surface finish

• Product part number

• Quantity

• Batch or lot number

The number of pieces per bag is confirmed according to product size, weight, and order requirements.

2. Outer Packaging – Cartons

Plastic-bagged products are packed into outer cartons.

Standard Carton Dimensions

Carton selection depends on the thread size, product dimensions, quantity, and shipment weight.

Final pieces per carton, net weight, and gross weight are confirmed for each order.

Carton Labeling

Customer-specific labels may include:

• Product description

• Thread size

• Material

• Surface treatment

• Customer part number

• Purchase order number

• Quantity per carton

• Net weight

• Gross weight

• Batch or lot identification

• Shipping marks

3. Pallet Packaging

For bulk orders, cartons may be arranged on pallets for consolidated transportation and warehouse handling.

Provided Pallet Dimensions: 215 × 100 × 90 cm

The final pallet configuration depends on carton quantities, total weight, shipping requirements, and customer instructions.

Pallet Information

Where required, pallet identification may include:

• Product name

• Purchase order number

• Number of cartons

• Total quantity

• Gross weight

• Pallet dimensions

• Customer shipping marks

• Destination information

4. OEM Customized Packaging

JUXIN FASTENERS can review packaging requirements for OEM manufacturers, industrial distributors, and global purchasing programs.

Available packaging arrangements for review include:

• Custom pieces per plastic bag

• Customer-defined carton quantities

• Special carton dimensions

• OEM part-number labels

• Barcode labeling

• Batch and lot identification

• Warehouse receiving labels

• Custom shipping marks

• Customer-specific pallet arrangements

• Special handling instructions

Customized packaging is confirmed during quotation and order processing.

5. Packaging Protection for Blue Zinc-Plated Steel

Closed-end full-hex blind rivet nuts with blue zinc plating should be handled and stored under appropriate conditions to help protect the plated surface.

Recommended Storage and Handling

• Store products in a clean, dry environment.

• Avoid prolonged moisture exposure.

• Prevent unnecessary abrasion of plated surfaces.

• Keep products away from corrosive substances.

• Avoid excessive carton stacking loads.

• Maintain clear identification between thread sizes.

• Inspect packaging condition before storage or shipment.

Additional protective packaging can be reviewed where special transportation or storage conditions apply.

6. Standard Packaging Summary

7. Bulk Packaging and OEM Shipment Inquiries

For bulk orders, OEM packaging, custom labeling, and industrial shipment requirements, please contact JUXIN FASTENERS.

Please provide the required thread sizes, quantities, destination, and any special packaging or labeling instructions.

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

JUXIN FASTENERS — Industrial Fastening and Custom Component Solutions.