Stainless Steel Flat Head Open-End Partial Hex Body Blind Rivet Nuts

Stainless Steel Flat Head Open-End Partial Hex Body Blind Rivet Nuts – Technical Specifications and OEM Fastening Solutions

JUXIN FASTENERS supplies stainless steel flat head open-end partial hex body blind rivet nuts for OEM manufacturers, sheet-metal fabricators, mechanical design engineers, and industrial procurement teams.

Also referred to as flat head half hex rivet nuts, part hex rivnuts, or partial hex blind threaded inserts, these fasteners provide reusable internal threads in sheet-metal panels and hollow fabricated components where installation access is available from one side only.

This configuration combines a flange-bearing head, a partially hexagonal body, and an open-end threaded barrel. The selection is particularly relevant where panel support, resistance to insert rotation, and screw-length flexibility must be considered together.

Product Specifications

Product type: Flat head open-end partial hex blind rivet nut

Material: Stainless steel

Thread sizes: M3, M4, M5, M6, M8, M10

Head style: Flat head / Flanged head

Body style: Partial hexagonal / Half hex body

End configuration: Open end

Product-family grip range: 0.5–4.0 mm (approximately 0.020–0.157 in)

Installation: One-sided blind installation

Mounting-hole geometry: According to the approved product drawing

Stainless steel grade: Subject to confirmation

Thread system: Metric sizes listed; inch-thread options require separate confirmation

OEM customization: Drawing-based technical and commercial review

The stated grip range represents the product family. The approved grip limits and dimensions for each individual thread size must be confirmed using the relevant dimensional drawing.

Engineering Features and Selection Considerations

1. Flat Head Flange and Panel Support

The flat head provides a bearing surface against the accessible side of the parent material.

Compared with a reduced-head design, a flat head configuration may provide a larger flange-bearing area, depending on the actual dimensions.

This can be useful where the mounting panel requires additional local support around the installation hole.

However, a larger flange does not automatically establish a higher push-out, pull-through, or joint load rating.

Actual performance depends on flange dimensions, parent-material properties, mounting-hole geometry, grip thickness, and installation conditions.

Engineers should verify the required flange diameter, head thickness, and axial retention performance against the approved product drawing and application requirements.

2. Partial Hexagonal Body and Rotational Retention

The partial hexagonal body combines a hexagonal section with a cylindrical section.

Where the hexagonal section engages a compatible mounting hole, the non-round geometry can help resist insert rotation during screw tightening and removal.

This is particularly relevant for removable equipment panels, maintenance covers, and repeatedly serviced assemblies.

Actual resistance to rotation depends on the engagement geometry, mounting-hole tolerances, parent material, and installation process.

A partial hex body should not be assigned a specific spin-out torque without supporting test results.

3. Mounting-Hole Geometry: A Critical Design Decision

The designation "partial hex" does not independently establish the correct mounting-hole shape.

Different half-hex insert designs may require different hole configurations.

Some are designed for compatible hexagonal holes, while other designs are engineered for round-hole installation.

Before specifying or substituting an insert, engineers should confirm the mounting-hole requirements from the selected product drawing.

For a hexagonal mounting hole, review:

• Width across flats

• Corner geometry and radius

• Hole dimensional tolerance

• Panel thickness

• Hexagonal body engagement

• Insertion clearance

For a round-hole-compatible design, review:

• Recommended hole diameter and tolerance

• Body insertion clearance

• Parent-material compatibility

• Setting deformation

• Required rotational retention

A round hole must not be substituted for a specified hexagonal hole without engineering validation.

4. Flat Head vs. Thin Head: Flange Projection and Bearing Area

Flat head and thin head rivet nuts may use similar internal threads and body styles, but their flange geometry serves different design priorities.

A flat head generally provides a more pronounced flange-bearing surface.

A thin head is intended to reduce projection above the panel surface.

The correct choice depends on the available surface clearance, panel material, flange dimensions, and required joint performance.

For overlapping panels, designers should verify whether the flat head creates interference with the mating component.

For assemblies requiring a near-flush or flush surface, a thin head or countersunk configuration may be more appropriate.

A change from thin head to flat head should not be approved based solely on thread size and grip range.

5. Open-End Design and Screw-Length Flexibility

The open-end configuration permits a mating screw or threaded stud to extend through the insert where sufficient backside clearance is available.

This can provide flexibility in screw-length selection.

Unlike a closed-end insert, the open-end barrel does not provide a closed tip that prevents the screw from passing beyond the insert.

However, screw extension must be checked against nearby wiring, moving parts, insulation, enclosure walls, and other internal components.

Engineers should evaluate:

• Mating screw length

• Required thread engagement

• Assembled component thickness

• Washer and spacer thickness

• Available backside clearance

• Maximum permitted screw projection

An open-end rivet nut is not inherently a sealed fastening solution.

Where environmental sealing is required, the complete joint and any sealing elements must be evaluated.

6. Grip Range and Parent-Material Thickness

This product family is identified with a grip range of 0.5–4.0 mm, depending on the selected size and configuration.

Grip range refers to the material thickness for which the specific insert is designed.

The complete family range must not be assumed to apply to every thread size.

For thin sheet-metal assemblies, engineers should evaluate local panel deformation, mounting-hole quality, flange seating, and available material support.

Where the panel thickness approaches the minimum or maximum permitted grip, representative installation trials may be necessary.

7. Installation Process and Setting Consistency

Blind rivet nuts are installed from one accessible side of the workpiece.

A compatible setting tool deforms the insert behind the panel to create mechanical retention.

The installation process must be appropriate for the selected body geometry, material, thread size, and grip thickness.

Incorrect setting parameters may result in inadequate retention, panel distortion, or damaged internal threads.

For production applications, engineers should establish and verify:

• Hole preparation method

• Insert seating and orientation

• Installation tool compatibility

• Setting stroke or force

• Installed flange condition

• Internal thread condition

• Required axial and rotational retention

Representative production panels should be used for process validation where installation reliability is important.

8. Stainless Steel Material and Environmental Compatibility

Stainless steel may offer corrosion-resistance advantages in selected industrial environments.

The exact stainless steel grade for this product family has not been confirmed.

The required grade should be specified and verified before production approval.

For applications involving moisture, cleaning chemicals, chloride exposure, or contact with dissimilar metals, material compatibility should be reviewed.

Where material traceability is required, the purchasing specification should identify the relevant documentation.

9. Joint Loading and Fastener Retention

A blind rivet nut provides an internal thread, but overall joint performance depends on more than the insert itself.

The joint must be evaluated as a complete fastening system.

Important factors include:

• Mating screw grade and geometry

• Required thread engagement

• Parent-material thickness and strength

• Flange-bearing area

• Insert deformation and retention

• Installation-hole quality

• Applied tightening torque

• Axial and transverse service loads

• Vibration and repeated servicing

A flat head partial hex rivet nut should not be assumed suitable for a specific structural or safety-critical application without appropriate engineering verification.

Flat Head vs. Thin Head Partial Hex Rivet Nuts

Flat head partial hex rivet nuts are relevant where a more pronounced flange-bearing surface is acceptable.

Thin head partial hex rivet nuts are relevant where reduced surface projection is a priority.

Both may offer geometric resistance to rotation through the partial hexagonal body when correctly installed.

However, differences in flange dimensions and installation geometry can affect interchangeability.

For supplier substitution, engineers should compare the complete dimensional drawings rather than relying on nominal thread size.

Partial Hex vs. Full Hex vs. Knurled Round Body Rivet Nuts

Partial hex rivet nuts combine hexagonal and cylindrical body sections.

Full hex rivet nuts use a more extensively hexagonal body and typically require a compatible non-round mounting hole.

Knurled round body rivet nuts use external ribs intended to increase engagement with the surrounding parent material.

The designs differ in hole preparation, body geometry, rotational engagement, and installation requirements.

The appropriate choice depends on the parent material, hole manufacturing capability, required spin-out performance, and assembly conditions.

Open-End vs. Closed-End Partial Hex Rivet Nuts

Open-end partial hex rivet nuts allow a mating screw to extend through the insert when sufficient backside clearance is available.

Closed-end partial hex rivet nuts prevent screw penetration beyond the barrel end.

Closed-end inserts require particular attention to available internal screw depth and the risk of screw bottoming.

Open-end inserts require attention to screw projection and possible interference with nearby components.

The correct configuration should be selected according to the assembly design rather than based on end style alone.

Industrial Applications and OEM Fastening Solutions

Automotive and Commercial Vehicles

Flat head partial hex rivet nuts may be considered for fabricated brackets, equipment housings, access panels, and serviceable sheet-metal assemblies.

The flange provides a bearing surface at the mounting hole, while the partial hex body can contribute to rotational engagement.

Vibration, corrosion, and mechanical performance requirements should be verified for the application.

Electrical Cabinets and Control Equipment

Potential applications include electrical cabinets, control panels, instrument enclosures, and internal equipment mounting brackets.

Blind installation is useful where the rear side of a panel is inaccessible after fabrication.

The open-end configuration requires checking screw penetration and electrical clearances.

Industrial Machinery and Equipment

These inserts may provide reusable threaded connections for machine guards, access covers, mounting brackets, and maintenance panels.

For frequently serviced components, engineers should evaluate resistance to insert rotation and repeated screw installation.

HVAC and Appliance Manufacturing

Potential applications include equipment cabinets, appliance housings, sheet-metal covers, and mounting structures.

The flange-bearing surface and one-sided installation capability may be useful for fabricated equipment.

Panel thickness, hole geometry, and installation consistency should be confirmed.

Railway and Transportation Equipment

Potential applications include non-safety-critical interior panels, fabricated equipment enclosures, and serviceable mounting components.

Application-specific mechanical loads, vibration, corrosion exposure, and documentation requirements must be reviewed.

Metal Furniture and Fabricated Structures

Flat head partial hex inserts may be considered for metal furniture frames, fabricated cabinets, hollow sections, and removable sheet-metal assemblies.

The selected mounting-hole geometry and retention performance should be validated for the intended parent material.

Industrial Enclosures and OEM Equipment

These threaded inserts may support modular equipment construction where removable components require repeatable threaded fastening.

Engineering teams should verify flange clearance, insert orientation, screw projection, and service access during assembly design.

Engineering Selection Checklist

Before approving a stainless steel flat head open-end partial hex rivet nut, confirm:

• Required metric thread size

• Stainless steel grade and material specification

• Parent material and panel thickness

• Approved grip range for the selected size

• Required mounting-hole shape

• Mounting-hole dimensions and tolerances

• Partial hex body dimensions

• Flange diameter and head thickness

• Overall insert length

• Available backside clearance

• Mating screw length and thread engagement

• Installation tooling and setting parameters

• Required spin-out torque

• Required push-out and pull-out performance

• Corrosion exposure and environmental requirements

• Inspection, documentation, and traceability

Engineering Standards and Technical Verification

Product selection should be based on the approved dimensional drawing and the requirements of the intended assembly.

Metric internal threads may be specified using applicable ISO metric thread standards, including ISO 261 and ISO 965 where relevant.

Where UNC or UNF threads are requested, applicable ASME B1.1 requirements must be identified separately.

Metric and UNC/UNF thread systems are not directly interchangeable.

Inch values shown as conversions are reference dimensions only and do not establish the availability of corresponding inch-threaded inserts.

Relevant ISO, DIN, EN, ASTM, SAE, ASME, or other applicable international standards should be selected according to the actual product, material, inspection, and application requirements.

No specific certification, mechanical performance rating, or standard conformity should be assumed without supporting documentation.

OEM Procurement and Supplier Qualification

For purchasing managers and supplier development teams, flat head partial hex rivet nuts require careful dimensional and installation compatibility review.

Two products with the same M6 internal thread may differ in flange diameter, flange thickness, partial hex geometry, grip range, and mounting-hole requirements.

These differences can affect panel clearance, installation compatibility, rotational retention, and assembly consistency.

Before approving an alternative supplier, procurement teams should compare the complete dimensional drawing and verify the selected insert in representative production assemblies.

For recurring OEM programs, material specifications, inspection criteria, traceability, packaging requirements, annual demand, and delivery expectations should be established during sourcing.

Custom OEM Flat Head Partial Hex Rivet Nut RFQ Requirements

Please provide:

• 2D drawing or 3D CAD model

• Required thread size and order quantity

• Stainless steel grade

• Parent material and actual panel thickness

• Mounting-hole shape, dimensions, and tolerance

• Partial hex body dimensions

• Flange diameter and thickness

• Required grip range

• Mating screw length and backside clearance

• Installation method and tooling requirements

• Required rotational and axial retention performance

• Inspection and traceability requirements

• Prototype or production quantities

• Estimated annual demand and delivery destination

JUXIN FASTENERS supports drawing-based technical reviews and OEM sourcing discussions for industrial blind rivet nuts and custom threaded fastening components.

Final dimensions, mounting-hole compatibility, material availability, production requirements, and inspection criteria should be confirmed before production approval.

Related Fastening Solutions

Thin Head Open-End Partial Hex Body Blind Rivet Nuts

A low-profile alternative where reduced flange projection is required.

Thin Head Closed-End Partial Hex Body Blind Rivet Nuts

An alternative where a low-profile flange and prevention of screw penetration through the insert are important.

Thin Head Open-End Knurled Blind Rivet Nuts

An alternative using an externally knurled round body.

Countersunk Head Open-End Knurled Blind Rivet Nuts

A potential solution where a prepared countersink and reduced installed flange projection are required.

Full Hex Body Blind Rivet Nuts

An alternative for assemblies requiring a full hexagonal body and compatible mounting-hole geometry.

Request an OEM Quotation

For stainless steel flat head open-end partial hex body blind rivet nuts, custom threaded inserts, or drawing-specific OEM fastening solutions, contact JUXIN FASTENERS with your engineering drawings and purchasing requirements.

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

JUXIN FASTENERS – Industrial Blind Rivet Nuts and Custom OEM Fastening Solutions.

Packaging and Delivery – Stainless Steel Flat Head Open-End Partial Hex Blind Rivet Nuts

JUXIN FASTENERS reviews packaging arrangements according to product dimensions, order quantities, handling conditions, and OEM purchasing requirements.

Packaging Requirements

• Packaging quantity: Subject to order confirmation

• Inner packaging: According to approved packing instructions

• Outer packaging: According to shipment requirements

• Product identification: Part number, thread size, and material specification as required

• Batch identification: According to agreed traceability requirements

• Custom packaging: Subject to technical and commercial confirmation

Packaging Protection

Flat head partial hex blind rivet nuts should be protected from unnecessary mechanical damage, flange deformation, and thread contamination during handling, storage, and transportation.

Packaging arrangements should consider protection of the flat head flange and partial hexagonal body geometry, particularly where dimensional integrity is important for installation.

OEM Supply and Documentation

For recurring OEM programs, packaging quantities, labeling, inspection documentation, material records, and delivery arrangements should be agreed upon before shipment.

Final packaging specifications are confirmed according to the approved purchase order.

For OEM packaging requirements and quotations, contact info@juxinfasteners.com.

Website: www.juxinfasteners.com