Blue Zinc Flat Head Open-End Half-Hex Blind Rivet Nuts

Anti-Rotation Steel Threaded Inserts for OEM Sheet Metal Assemblies

JUXIN FASTENERS provides blue zinc-plated flat head open-end half-hex blind rivet nuts for industrial applications requiring reusable internal threads, 

single-sided installation, and mechanical resistance to rotation.

These fasteners are also known as partial hex body rivet nuts, half-hex nutserts, flat head blind threaded inserts, and open-end hexagonal rivet nuts.

The partially hexagonal body engages with a matching installation hole, helping prevent the insert from rotating when a mating screw is tightened or removed. 

The flat head provides a bearing surface against the panel, while the open-end configuration allows the screw to extend through the insert when sufficient clearance is available.

The blue zinc-plated steel construction is suitable for selected indoor industrial applications where a protective zinc coating is required.

Typical applications include electrical enclosures, control cabinets, industrial machinery housings, fabricated sheet metal panels, commercial vehicle components, and equipment mounting brackets.

Product Features

• Half-Hex Body: Mechanical anti-rotation engagement with compatible hole geometry.

• Flat Head / Large Flange: Provides an enlarged bearing surface around the installation hole.

• Open-End Configuration: Allows through-thread engagement where backside clearance permits.

• Blue Zinc-Plated Steel: Provides sacrificial corrosion protection for the underlying steel.

• Single-Sided Installation: Suitable for assemblies with restricted rear access.

• Reusable Internal Threads: Supports removable screw-fastened components.

• Metric Thread Range: M3, M4, M5, M6, M8, M10, and M12.

• Series Grip Range: 0.5–5.0 mm, subject to individual size specifications.

• OEM Customization: Drawing-based dimensions and Unified inch-thread options can be evaluated.

Engineering Advantages of the Half-Hex Design

Positive Anti-Rotation Engagement

A conventional round-body rivet nut primarily depends on installation deformation and friction against the mounting hole.

A half-hex rivet nut introduces non-round geometric engagement.

When correctly installed in a matching hole, this geometry helps resist rotation during tightening and maintenance operations.

However, actual spin-out resistance depends on hole dimensions, material thickness, panel hardness, installation stroke, and the applied torque.

For production applications, engineers should validate installed spin-out torque rather than relying on body geometry alone.

Large Flange Load Distribution

The flat head provides a relatively large contact area around the mounting hole.

This can help distribute compressive loads and reduce localized panel deformation.

The design is useful in selected thin-gauge metal assemblies where a reduced-head insert would provide insufficient bearing area.

Flange diameter, panel strength, and installation quality determine the actual push-through resistance.

Installation Without Welding

Half-hex blind rivet nuts can be installed from one accessible side using a compatible manual, pneumatic, or hydraulic setting tool.

During installation, the tool pulls the threaded portion toward the flange, causing the designated body section to deform behind the panel.

This produces a mechanically retained threaded insert without welding or directly tapping the host sheet.

The process can be particularly useful for pre-finished metal housings and enclosed fabricated assemblies.

Blue Zinc Finish for Industrial Applications

Blue zinc plating is an electroplated zinc finish commonly used for steel industrial fasteners.

The zinc coating provides sacrificial corrosion protection, while the selected passivation treatment contributes to coating performance.

For OEM procurement, coating requirements should specify more than the appearance of the finish.

Important parameters include:

• Zinc coating thickness

• Passivation type

• Corrosion-resistance requirements

• Surface appearance

• Restricted-substance requirements

• Compatibility with mating components

• Storage and operating environment

ASTM B633 and ISO 2081 may be used as relevant reference standards when specifying electroplated zinc coatings.

Where RoHS compliance is required, the applicable substance restrictions and supporting documentation should be confirmed for the supplied coating system.

Blue zinc plating should not automatically be considered suitable for continuous outdoor, marine, or aggressive chemical exposure.

Industrial Applications

Electrical Cabinets and Control Panels

Half-hex blind rivet nuts provide reusable threaded mounting points for electrical cabinet structures.

Typical applications include mounting brackets, removable panels, support rails, internal hardware, and equipment mounting plates.

Their single-sided installation capability is particularly useful when rear access is limited.

The half-hex body can help reduce insert rotation during repeated panel maintenance.

For protective grounding or electrical bonding connections, the complete joint must be evaluated for electrical continuity and applicable equipment requirements.

Industrial Machinery

Blue zinc half-hex rivet nuts can be used in fabricated machine housings, access panels, equipment guards, and mounting brackets.

They provide a serviceable threaded connection where welding or backside nut installation is inconvenient.

Automotive and Commercial Vehicles

Potential applications include interior brackets, electrical equipment mounting, fabricated covers, and selected non-structural vehicle assemblies.

Vibration resistance must be validated at the joint level, including the mating screw, preload, panel material, and operating conditions.

HVAC and Mechanical Equipment

These inserts may be used in equipment housings, service panels, ventilation assemblies, and mounting brackets.

For moisture-exposed applications, engineers should consider the limitations of the open-end configuration and the specified coating.

Industrial Enclosures and Sheet Metal Fabrication

Half-hex rivet nuts provide a practical fastening option for hollow profiles, folded metal structures, and enclosures where conventional nut installation is difficult.

Open-End Versus Closed-End Rivet Nuts

Open-end half-hex rivet nuts allow a mating screw to pass through the threaded insert.

This provides flexibility in screw engagement but requires sufficient backside clearance.

Closed-end rivet nuts enclose the threaded cavity and can help protect it against direct contamination through the insert body.

However, a closed-end insert alone does not guarantee a watertight joint. Sealing performance depends on the flange interface, installation conditions, and any additional sealing components.

OEM Procurement and Custom Manufacturing

JUXIN FASTENERS supports drawing-based inquiries for industrial blind rivet nuts and custom threaded inserts.

Procurement and supplier development teams can submit:

• Product drawings and revision numbers

• Metric or Unified inch-thread requirements

• Half-hex body dimensions

• Installation hole geometry

• Host material and thickness

• Required mechanical performance

• Coating and corrosion specifications

• Estimated order quantities

• Annual demand forecasts

• Packaging and labeling requirements

Custom configurations are subject to technical and commercial review.

Request a Quotation

For OEM production programs, technical sourcing projects, or custom blind rivet nut requirements, contact JUXIN FASTENERS.

Please provide your drawing, installation requirements, and estimated purchasing quantity.

JUXIN FASTENERS

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

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