Flat Head Open-End Half-Hex Steel Blind Rivet Nuts – Color Zinc Plated

Anti-Rotation Partial Hex Nutserts for OEM Sheet Metal and Industrial Equipment

JUXIN FASTENERS provides flat head open-end half-hex steel blind rivet nuts for creating reusable internal threads in thin sheet metal, 

hollow sections, fabricated enclosures and industrial equipment assemblies.

These blind threaded inserts combine a partially hexagonal body, a flat bearing flange and an open-end threaded barrel. 

The half-hex geometry is designed to engage with a corresponding non-round installation hole, helping resist rotation during screw tightening and subsequent maintenance.

The open-end configuration allows a mating screw to extend through the insert, provided adequate clearance is available behind the mounting panel.

Also known as half-hex rivet nuts, partial hex nutserts, open-end hex-body threaded inserts and blind rivet nuts, 

these fasteners provide an alternative to welded nuts, loose nuts and directly tapped threads where access or panel thickness makes conventional fastening difficult.

This product family is manufactured from steel with a color zinc-plated finish and includes metric thread sizes M3, M4, M5, M6, M8 and M10.

The stated series grip range is 0.5–4.0 mm. Individual grip ranges and installation dimensions must be confirmed against the approved product drawing.

Key Product Features

• Partial Hexagonal Body: Provides mechanical engagement with a correctly sized matching hole to improve resistance to rotation.

• Open-End Thread Configuration: Allows mating screws or threaded studs to pass through the insert when sufficient backside clearance is available.

• Flat Head / Flanged Design: Provides a bearing surface that distributes load around the mounting hole.

• Steel Construction: Provides a durable threaded fastening component for appropriately engineered industrial assemblies.

• Color Zinc Plating: Offers sacrificial corrosion protection for the steel substrate.

• Single-Sided Installation: Suitable for enclosed structures and hollow profiles where rear access is restricted.

• Cold Installation Process: Creates a retained internal thread without welding heat.

• Serviceable Threaded Connection: Allows components to be removed and reassembled using compatible screws.

• OEM Customization: Special dimensions, thread systems, grip ranges, finishes and packaging can be evaluated against customer drawings.

Engineering Advantages of Half-Hex Blind Rivet Nuts

1. Mechanical Anti-Rotation Engagement

One of the primary reasons to select a half-hex blind rivet nut is the need to resist rotation during assembly and maintenance.

A conventional round-body rivet nut generally depends on friction and mechanical retention generated during installation.

A half-hex insert incorporates a partially hexagonal body section that engages with a corresponding non-round mounting hole.

This creates geometric resistance against insert rotation when torque is applied through the mating screw.

The actual spin-out resistance depends on several factors:

• Mounting hole profile and tolerances

• Host panel thickness and material hardness

• Insert body dimensions

• Installation stroke or setting force

• Surface condition and coating thickness

• Mating screw thread

• Applied tightening torque

• Number of assembly and maintenance cycles

Engineering Consideration: A half-hex body does not guarantee a particular torque-out rating. 

Performance should be established using representative test samples installed in the intended panel material.

2. Open-End Design for Flexible Screw Engagement

The open-end configuration provides an internal thread without an enclosed barrel at the rear.

This allows the mating screw to extend through the insert when the assembly design permits.

For OEM design engineers, this can simplify the selection of screw lengths where multiple components or varying stack-up dimensions are involved.

However, screw length must still be controlled to avoid interference with nearby components, cables, electronics or moving assemblies.

The open-end design does not provide a sealed rear thread cavity. 

Applications requiring protection against moisture or contamination may require a closed-end insert or a separately validated sealing arrangement.

3. Flat Flange for Panel Support

The flat head provides a bearing surface against the host material.

Compared with a reduced-head configuration, a larger flange may distribute load over a wider area and improve resistance to push-through under suitable conditions.

This can be useful in sheet metal assemblies where localized panel deformation must be controlled.

The appropriate flange size depends on panel thickness, material properties, mounting hole geometry and joint loading.

4. Threaded Fastening Without Welding or Tapping

Thin sheet metal often provides insufficient material thickness for reliable direct tapping.

Welded nuts can require additional manufacturing operations and may introduce heat distortion, particularly in thin-gauge or pre-finished panels.

Half-hex blind rivet nuts create an internal threaded connection through a mechanical setting process.

The insert is positioned in the prepared mounting hole and installed using a compatible manual, pneumatic or hydraulic rivet nut setting tool.

During installation, the designated deformable section expands behind the panel to create mechanical retention.

This method can reduce the need for secondary welding operations while maintaining access from only one side of the workpiece.

Product Specifications

The stated grip range applies to the product family. The available range for each thread size must be confirmed from the corresponding drawing.

Industrial Applications

Electrical Cabinets and Control Enclosures

Half-hex blind rivet nuts are suitable for consideration in electrical cabinet and control enclosure assemblies requiring reusable mounting threads.

Typical applications include:

• Control cabinet mounting brackets

• Distribution enclosure panels

• Equipment support rails

• Removable access panels

• Fan mounting brackets

• Internal component supports

• Industrial control housings

These assemblies often use relatively thin sheet metal, where welding may introduce deformation or interfere with surface finishes.

The half-hex body provides additional resistance to rotation during repeated maintenance operations.

Where a fastening point is used for electrical bonding or protective grounding, the assembled connection must be separately evaluated for electrical continuity.

Automotive and Commercial Vehicle Equipment

Open-end half-hex rivet nuts may be used in selected vehicle brackets, interior equipment housings, serviceable panels and non-safety-critical sheet metal components.

Potential benefits include one-sided assembly access, reduced welding operations and reusable internal threads.

Vibration, fatigue, joint preload and corrosion requirements must be evaluated for each application.

Industrial Machinery and Automation

Machinery housings, access covers, control boxes and mounting brackets frequently require threaded fastening points that can be serviced from one side.

Half-hex rivet nuts can help reduce insert rotation during screw removal and reinstallation.

HVAC and Mechanical Equipment

Potential applications include ventilation equipment housings, mechanical enclosure brackets, service panels and accessory mounting structures.

The selected zinc coating must be evaluated against expected humidity, condensation and service conditions.

Sheet Metal Fabrication

Half-hex rivet nuts may be considered for:

• Fabricated steel cabinets

• Hollow metal sections

• Instrument housings

• Industrial furniture

• Equipment frames

• Removable mounting brackets

• Sheet metal subassemblies

The mounting hole profile and installation process must be compatible with the selected rivet nut.

Color Zinc Plating for Industrial Fasteners

Color zinc plating is used to provide sacrificial corrosion protection to the steel substrate.

The visual color alone does not establish coating thickness, corrosion resistance or restricted-substance compliance.

For OEM sourcing, the coating specification should identify:

• Zinc coating thickness

• Passivation type

• Corrosion test requirements

• Surface appearance

• Restricted-substance requirements

• Inspection criteria

• Packaging and storage conditions

Relevant international coating specifications may include ASTM B633 and ISO 2081 where applicable.

RoHS compliance should be confirmed using documentation for the actual specified plating process.

Color zinc-plated steel should not automatically be considered suitable for marine, highly corrosive or continuously exposed outdoor environments.

Metric and Inch Thread Requirements

The documented standard product range includes metric threads M3 through M10.

For North American OEM programs, JUXIN FASTENERS can evaluate custom drawings specifying Unified inch threads.

Common Unified thread designations used in industrial fastening applications include:

• #6-32 UNC

• #8-32 UNC

• #10-24 UNC

• 1/4-20 UNC

• 5/16-18 UNC

• 3/8-16 UNC

These inch sizes are provided as reference designations for custom engineering inquiries. They are not confirmed stock sizes for this product.

Metric threads should be defined using applicable ISO metric thread specifications, while Unified threads may be specified according to ASME B1.1.

The thread system, body dimensions, mounting hole and setting mandrel must all match the approved product configuration.

Custom Half-Hex Rivet Nuts for OEM Manufacturing

JUXIN FASTENERS supports drawing-based review of custom industrial fastening requirements.

Possible customization requests include:

• Special metric thread sizes

• Unified inch threads

• Modified flange dimensions

• Alternative partial-hex body geometry

• Special grip ranges

• Customized barrel lengths

• Alternative surface treatments

• Customer-specific inspection requirements

• Packaging and labeling requirements

• Recurring production supply programs

Feasibility, minimum order quantities, tooling and lead times are determined according to the approved technical requirements.

Request a Quotation from JUXIN FASTENERS

For OEM purchasing, supplier qualification and custom threaded insert projects, please provide:

1. Thread size and pitch

2. Technical drawing or CAD file

3. Panel material and thickness

4. Mounting hole profile and dimensions

5. Required grip range

6. Mechanical performance requirements

7. Coating specification

8. Estimated order quantity

9. Annual demand forecast

10. Packaging and inspection requirements

Our team can review your requirements and prepare a quotation based on the confirmed product configuration.

JUXIN FASTENERS

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

Contact: https://www.juxinfasteners.com/contact-us/