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

Product Specifications — Stainless Steel Flat Head Open-End Partial Hexagonal Blind Rivet Studs

JUXIN FASTENERS supplies stainless steel flat head open-end partial hexagonal blind rivet studs for OEM sheet-metal assemblies requiring external male-threaded mounting points and installation from one accessible side.

This product combines a flat head, an open-end rivet body, a partially hexagonal exterior and an external metric threaded stud. The partial hexagonal section can engage a matching mounting hole, providing geometric resistance to rotation when a mating nut is installed or removed.

Unlike internally threaded blind rivet nuts, these fasteners provide an external male thread for attaching brackets, covers, mounting plates and other components.

The natural stainless steel finish distinguishes this version from zinc-coated steel alternatives. Its selection should be based on the required stainless steel grade, installation formability, operating environment and approved assembly performance.

Technical Specification Summary

Product Name: Flat Head Open-End Partial Hexagonal Blind Rivet Stud

Material: Stainless Steel

Material Grade: To be confirmed against the approved specification

Thread Sizes: M5, M6, M8

Thread Configuration: External Male Metric Thread

Head Type: Flat Head

Body Type: Open-End, Partial Hexagonal

Surface Finish: Natural Stainless Steel Color

Grip Range: 0.5–5.5 mm across the product family

Installation Method: One-Sided Mechanical Blind Riveting

Hexagonal Body Dimensions: According to the approved drawing

Mounting-Hole Geometry: According to the approved drawing

Thread Pitch and Tolerance: According to the approved drawing

External Stud Projection: According to the approved drawing

Installation Parameters: Subject to part and tooling verification

Custom Requirements: Subject to technical review and manufacturing feasibility

The stated grip range applies to the product family. Individual part-number dimensions and permitted grip thicknesses must be verified before installation.

1. Product Function and Construction

An open-end partial hexagonal blind rivet stud creates a retained external threaded mounting point in a sheet-metal panel or compatible hollow section.

The fastener is inserted through a prepared mounting hole from the accessible side.

A suitable setting tool then deforms the rivet body behind the parent material, establishing mechanical retention.

The external male thread remains available for attaching a component with a compatible nut.

This construction is relevant when rear-side access is unavailable after fabrication or assembly.

The partial hexagonal body adds a geometric anti-rotation feature, while the flat head provides the accessible-side seating interface.

The open-end body configuration should be distinguished from closed-end alternatives. Neither construction should be assumed to provide environmental sealing without separate validation.

2. Open-End Blind Rivet Stud vs. Blind Rivet Nut

These products can look similar before installation, but they serve different fastening functions.

Open-End Blind Rivet Stud

Provides an external male thread.

Typically receives a mating nut to secure an additional component.

Blind Rivet Nut

Provides an internal female thread.

Typically receives a mating bolt or screw.

Both may use one-sided mechanical installation, but the tooling engagement and assembly requirements differ.

For an OEM drawing, the supplier must confirm whether the application requires an external stud or an internally threaded insert.

Confusing the two products can lead to incorrect quotations, incompatible installation tools and assembly delays.

3. Partial Hexagonal Body and Geometric Anti-Rotation

The partially hexagonal body incorporates a polygonal section intended to engage a compatible mounting hole.

When the installed stud is subjected to torque during nut assembly, the polygonal interface can help resist rotation.

This mechanism differs from a smooth round body, where rotational resistance depends on installed deformation and contact conditions without the same hexagonal engagement.

It also differs from a knurled body, which uses raised exterior features that may engage the parent material.

Actual rotational resistance depends on:

• Hexagonal section dimensions

• Mounting-hole dimensions

• Parent-material properties

• Panel thickness

• Hole-manufacturing accuracy

• Installed body deformation

• Tool setting conditions

• Applied assembly torque

The geometric design does not establish a specific spin-out torque rating without testing.

4. Partial Hexagonal Body Geometry

A partial hexagonal body is not necessarily hexagonal along its entire length.

Its actual configuration may include a polygonal section, a transition region and a deformable rivet-body section.

The approved drawing should define:

• Hexagonal across-flats dimension

• Across-corners dimension

• Hexagonal section length

• Transition geometry

• Rivet-body length

• Head dimensions

• External threaded projection

• Grip range

These dimensions determine how the stud fits the prepared mounting hole and deforms during setting.

A product with the same nominal M6 thread may not be interchangeable if its partial hexagonal geometry differs.

5. Mounting-Hole Geometry and Production Compatibility

Where anti-rotation relies on polygonal engagement, the mounting hole must provide the required matching geometry.

The hole may be produced by a suitable controlled fabrication process, depending on the parent material and production requirements.

Important inspection characteristics include:

• Across-flats dimension

• Corner geometry

• Hole position

• Hole tolerance

• Burr condition

• Edge condition

• Panel thickness

• Local flatness

• Distance from adjacent features

An oversized hole may reduce the intended geometric engagement.

An undersized hole may prevent insertion or damage the fastener or panel.

The hole specification must be taken from the approved part drawing rather than inferred from the nominal thread size.

6. Engineering Information Gain — Why an M6 Partial Hex Stud May Not Fit Another M6 Hole

Two stainless steel blind rivet studs may both be described as M6 flat head partial hexagonal products.

Nevertheless, they may require different mounting-hole geometries.

Consider the following differences.

Across-Flats Dimension

A different polygonal body width may prevent insertion or produce excessive clearance.

Hexagonal Section Length

A shorter or longer polygonal section may change the effective engagement with the panel.

Transition Geometry

The transition between the polygonal section and deformable body may interfere with the hole or affect setting behavior.

Head Diameter

A different head size changes the accessible-side bearing interface.

Grip Range

The selected fastener may not accommodate the actual panel thickness.

Stud Projection

The available external thread after installation may be insufficient for the mating bracket and nut.

The engineering lesson is that thread size alone is not an interchangeability criterion.

For supplier substitution, the complete drawing and installed assembly requirements should be compared.

7. Grip Range and Panel Thickness

The confirmed product-family grip range is 0.5–5.5 mm.

Approximate inch references:

0.5 mm = 0.020 in

5.5 mm = 0.217 in

Grip range refers to the parent-material thickness that the selected rivet body is designed to accommodate.

It is not equivalent to the external threaded length.

The actual grip range must be confirmed for each M5, M6 and M8 part number.

An incorrect selection can lead to incomplete deformation, excessive panel distortion, poor head seating or insufficient retention.

Where panels contain local reinforcements, multiple layers or formed features, the effective installed grip thickness should be evaluated.

8. Metric Thread Sizes and International References

The confirmed sizes are M5, M6 and M8.

M5: Approximately 0.197 in nominal diameter

M6: Approximately 0.236 in nominal diameter

M8: Approximately 0.315 in nominal diameter

These inch measurements are approximate diameter references only.

They are not equivalent UNC, UNF or BSW thread sizes.

Metric and Unified inch threads are not directly interchangeable.

ISO 261 and ISO 965 provide relevant technical references for ISO metric thread combinations and tolerances where specified.

Actual pitch and thread tolerance must be confirmed from the approved drawing.

9. Stainless Steel Material Requirements

The confirmed material is stainless steel.

The exact grade and mechanical condition have not been supplied.

Material selection should account for both the threaded portion and the deformable rivet body.

Relevant characteristics include:

• Stainless steel grade

• Material condition

• Formability

• Mechanical strength

• Thread properties

• Rivet-body deformation

• Corrosion environment

• Parent-material compatibility

A stainless steel grade suitable for conventional bolts is not automatically suitable for every mechanically deformable blind rivet stud design.

The material and installation process must be evaluated together.

10. Natural Stainless Steel Finish

The specified finish is natural stainless steel color.

This describes the product's appearance but does not establish a particular surface roughness, chemical passivation treatment or corrosion-resistance classification.

Where cleaning or passivation is specified, ASTM A380/A380M and ASTM A967/A967M may provide relevant technical references.

These standards should only be applied where required by the approved material and surface-treatment specification.

No specific passivation process, test result or certification is claimed.

11. Corrosion Selection for OEM Applications

Stainless steel can offer useful corrosion-resistance characteristics, but suitability depends on the actual grade and environment.

Engineering review should consider:

• Atmospheric exposure

• Moisture

• Chloride contamination

• Cleaning chemicals

• Contact with dissimilar metals

• Crevice conditions

• Surface contamination

• Operating temperature

A natural stainless steel finish should not automatically be described as suitable for all outdoor, marine or chemical environments.

The grade and service conditions must be evaluated before approval.

12. Stainless Steel Studs in Aluminum Panels

Stainless steel partial hexagonal blind rivet studs may be evaluated for installation in compatible aluminum panels.

However, the material combination introduces several considerations.

The aluminum alloy and thickness influence local hole deformation.

The polygonal mounting-hole geometry affects the intended anti-rotation engagement.

The setting process must produce acceptable retention without excessive panel distortion.

Where moisture is present, galvanic corrosion risk should be considered.

Protective finishes, joint design and environmental controls may be relevant, depending on the application.

Compatibility must be validated for the actual assembly.

13. Flat Head Seating and Installed Projection

The flat head provides the accessible-side bearing surface.

Its diameter and thickness influence contact area and head projection.

A flat head does not necessarily provide a flush installation.

The external threaded projection should also be checked after setting.

For assembly design, engineers should consider:

• Head thickness

• Head diameter

• Panel clearance

• Mating bracket thickness

• Washer arrangement

• Required nut engagement

• Available thread projection

• Tool access

The loose-fastener overall length should not automatically be treated as the usable installed stud projection.

14. One-Sided Mechanical Installation

A typical installation process includes:

1. Prepare the mounting hole according to the approved drawing.

2. Inspect the polygonal hole dimensions and edge condition.

3. Verify the parent-material thickness.

4. Confirm the selected stud's grip range.

5. Engage the external thread with compatible installation equipment.

6. Align the partial hexagonal section with the mounting hole.

7. Insert the rivet body from the accessible side.

8. Seat the flat head against the panel.

9. Apply the approved setting action.

10. Form the retaining feature behind the parent material.

11. Release the installation equipment.

12. Inspect the installed stud before mating-component assembly.

Installation-tool configuration, setting stroke and acceptance criteria must be verified for the selected product.

15. Installed Axial Retention

Axial retention describes resistance to extraction of the installed stud from the parent material.

It depends on the deformed rivet body and its interaction with the panel.

Relevant factors include:

• Rivet-body geometry

• Grip thickness

• Material condition

• Parent-panel properties

• Hole dimensions

• Installation deformation

• Head seating

The partial hexagonal anti-rotation feature does not independently establish axial pull-out performance.

No universal axial retention rating is claimed.

16. Rotational Resistance and Mating-Nut Assembly

The partial hexagonal section can help resist stud rotation when a mating nut is tightened or removed.

However, the actual resistance depends on the installed assembly.

The engineer should establish the required assembly torque and verify that the stud-to-panel connection is compatible with it.

Repeated nut installation and removal may introduce additional requirements.

Where maintenance is expected, qualification should consider the intended service procedure and number of assembly cycles, if specified.

No universal spin-out torque or repeated-assembly rating is claimed.

17. Anti-Rotation Does Not Mean Vibration Locking

The partial hexagonal body contributes to resistance against rotation of the stud within the panel.

It does not independently prevent loosening of the mating nut.

These are separate engineering functions.

Stud Anti-Rotation

Prevents or limits rotation of the installed stud in the mounting hole.

Nut Loosening Resistance

Concerns maintaining the required threaded-joint condition during service.

Where vibration resistance is important, the complete nut-and-stud connection should be evaluated using an appropriate locking strategy and validated assembly conditions.

18. Engineering Example — Serviceable Equipment Mounting Bracket

Consider an OEM fabricated equipment enclosure requiring an M6 externally threaded mounting point.

The rear side of the panel becomes inaccessible after fabrication.

A mounting bracket must be removable during maintenance.

A stainless steel open-end partial hexagonal blind rivet stud may be considered.

Before approval, the engineering team should confirm:

1. Required M6 thread pitch and tolerance

2. Stainless steel grade

3. Parent-panel material

4. Actual panel thickness

5. Selected stud grip range

6. Hexagonal body dimensions

7. Mounting-hole geometry

8. Flat-head dimensions

9. Installed stud projection

10. Mating bracket thickness

11. Nut engagement

12. Assembly torque

13. Installation-tool compatibility

14. Installed axial retention

15. Installed rotational resistance

16. Corrosion environment

17. Inspection and documentation requirements

This evaluation is more reliable than selecting a product solely from its nominal thread size and appearance.

19. Open-End vs. Closed-End Stud Selection

Open-end and closed-end blind rivet studs may differ in body construction.

Selection should be based on the actual drawing and application requirements.

Relevant considerations include:

• Body geometry

• Installation tooling

• Available blind-side clearance

• Grip compatibility

• Assembly environment

• Inspection requirements

• Environmental sealing needs

A closed-end designation does not automatically establish watertight performance.

An open-end designation does not automatically establish a particular ingress-protection classification.

Where sealing is required, the complete joint should be validated.

20. Stainless Steel vs. Zinc-Coated Steel Partial Hex Studs

The same general fastening function may be available in different materials.

Stainless Steel Version

Uses stainless steel as the base material and is supplied with a natural finish in this product configuration.

Zinc-Coated Steel Version

Uses steel with a specified zinc coating system.

Engineering comparison should consider:

• Material grade

• Installation formability

• Corrosion requirements

• Mechanical properties

• Surface treatment

• Finished dimensions

• Parent-material compatibility

• Installed performance

• Total assembly cost

The two versions should not automatically be considered interchangeable.

A material change may require installation trials or additional qualification.

21. Industrial Applications

Industrial Machinery

Potential applications include mounting brackets, equipment covers and serviceable metal assemblies.

Electrical Cabinets and Control Enclosures

Possible uses include accessory supports and internal mounting points where rear-side access is limited.

Automotive Equipment and Tier 1 Assemblies

The studs may be evaluated for selected non-safety-critical brackets, fabricated panels and equipment housings.

Automotive use requires project-specific engineering and customer approval.

Electric Vehicle Equipment

Potential applications include selected mounting supports and fabricated enclosures.

Electrical isolation, grounding, sealing and structural requirements must be evaluated separately.

HVAC Equipment

Possible applications include equipment brackets, sheet-metal housings and removable components.

Commercial Vehicle Equipment

The fasteners may be considered for selected non-critical mounting points, subject to load and environmental validation.

Fabricated Metal Products

Other potential applications include hollow metal profiles, industrial cabinets and modular sheet-metal assemblies.

22. OEM Qualification and Inspection

For production applications, the installed fastener should be evaluated as part of the complete assembly.

Depending on customer requirements, qualification may include:

• Approved engineering drawing

• Stainless steel material identification

• Dimensional inspection

• Thread inspection

• Partial hexagonal body inspection

• Mounting-hole verification

• Grip-range confirmation

• Installation-tool compatibility

• Head seating inspection

• Installed axial retention

• Installed rotational resistance

• Surface condition

• Corrosion evaluation where specified

• Drawing revision control

• Lot identification and traceability

Automotive programs may require additional customer-specific documentation or production approval activities.

No automotive OEM approval, PPAP status or certified performance is implied without supporting records.

23. Procurement Information Gain — Total Cost of a Stud Substitution

For purchasing managers and supplier development teams, a lower unit price does not necessarily produce a lower assembly cost.

Consider an alternative M6 stainless steel partial hexagonal blind rivet stud.

The alternative may require a different mounting-hole dimension.

This could introduce changes to punching tools, laser-cutting programs or inspection gauges.

It may also require different installation equipment or setting parameters.

If the external stud projection changes, the mating bracket or nut engagement may require review.

Additional validation may be necessary before the new supplier can be approved.

A practical sourcing comparison should therefore include:

• Fastener unit price

• Mounting-hole compatibility

• Tooling changes

• Installation cycle requirements

• Qualification testing

• Quality documentation

• Production disruption risk

• Packaging and logistics

• Long-term supply consistency

This approach helps distinguish a genuinely interchangeable part from a component that only looks similar.

24. OEM Supplier Development Requirements

Purchasing and supplier quality teams should confirm:

Product Configuration

Flat head, open-end body, partial hexagonal geometry and external male metric thread.

Material

Required stainless steel grade and condition.

Dimensions

Head geometry, hexagonal section, grip range and stud projection.

Installation

Mounting-hole specification and compatible setting equipment.

Mechanical Performance

Required axial retention and rotational resistance.

Quality Documentation

Inspection criteria, traceability and drawing revision control.

Commercial Requirements

Initial order quantity, annual demand, delivery expectations and packaging instructions.

Change Management

Approval requirements for material, dimensional or manufacturing changes.

The approved drawing should remain the primary reference for technical quotation and supplier qualification.

25. Drawing-Based OEM Requirements

Some applications require dimensions or characteristics outside a standard catalog configuration.

Potential requirements include:

• Specific hexagonal across-flats dimensions

• Modified hexagonal section length

• Special flat-head dimensions

• Defined external stud projection

• Application-specific grip range

• Specified stainless steel grade

• Controlled metric thread tolerance

• Surface treatment requirements

• Inspection documentation

• Packaging and traceability instructions

Nonstandard requirements are subject to technical review and manufacturing feasibility confirmation.

26. Frequently Asked Questions

What is an open-end partial hexagonal blind rivet stud?

It is a mechanically installed fastener with an external male thread and a partially hexagonal body, designed for one-sided installation in a compatible panel.

What is the difference between a blind rivet stud and a blind rivet nut?

A blind rivet stud provides an external male thread. A blind rivet nut provides an internal female thread.

What thread sizes are available?

The confirmed sizes are M5, M6 and M8.

What is the grip range?

The supplied product-family range is 0.5–5.5 mm. Individual part-number ranges require confirmation.

Does the partial hexagonal body prevent rotation?

Its geometry can contribute to resistance against rotation when installed in a compatible mounting hole. Actual performance must be verified.

Does it require a hexagonal mounting hole?

Where anti-rotation depends on polygonal engagement, the mounting hole must provide the corresponding geometry. The exact dimensions must be confirmed from the approved drawing.

What stainless steel grade is used?

The material is confirmed as stainless steel. The exact grade must be established from the approved specification.

Is the natural finish the same as passivated stainless steel?

Not necessarily. Natural appearance does not establish that a particular chemical passivation treatment has been performed.

Can these studs be used in aluminum panels?

They may be evaluated where hole geometry, grip thickness and installed performance are compatible. Dissimilar-metal corrosion should also be considered.

Can they replace zinc-coated steel rivet studs?

Not automatically. Material, dimensions, installation behavior, corrosion requirements and mechanical performance must be reviewed.

27. Related Industrial Fastening Solutions

For additional engineering comparisons, JUXIN FASTENERS offers related product categories for evaluation.

Stainless Steel Flat Head Partial Hexagonal Blind Rivet Studs — for comparison of closely related part-hex configurations.

Steel Partial Hexagonal Blind Rivet Studs — for applications considering a zinc-coated steel material system.

Smooth Round Body Blind Rivet Studs — for cylindrical body configurations.

Knurled Body Blind Rivet Studs — for alternative body engagement features.

Countersunk Blind Rivet Studs — for recessed head installation requirements.

Blind Rivet Nuts — for one-sided assemblies requiring internal female threads.

Self-Clinching Studs — for suitable press-installed sheet-metal applications.

Weld Studs — for approved welding-based fastening systems.

Custom Industrial Fasteners — for drawing-based OEM requirements.

The appropriate product should be selected according to installation access, parent material, mounting-hole geometry and required mechanical performance.

28. OEM RFQ Checklist

For accurate quotation and technical review, please provide the following information where available:

1. Required thread size: M5, M6 or M8

2. Engineering drawing or CAD file

3. Thread pitch and tolerance

4. Stainless steel grade

5. Flat-head dimensions

6. Partial hexagonal across-flats dimension

7. Hexagonal section length

8. Body transition geometry

9. External stud projection

10. Parent-panel material

11. Panel thickness

12. Required grip range

13. Mounting-hole dimensions and tolerance

14. Installation equipment and setting requirements

15. Axial retention requirements

16. Rotational resistance requirements

17. Surface condition requirements

18. Inspection and traceability documentation

19. Initial order quantity

20. Estimated annual demand

21. Packaging and delivery requirements

Providing the approved drawing and intended installation conditions helps establish compatibility and accurate quotation requirements.

29. JUXIN FASTENERS — OEM Stainless Steel Blind Rivet Stud Supply

JUXIN FASTENERS supplies industrial fastening products for international OEM engineering, purchasing and supplier development requirements.

Our stainless steel flat head open-end partial hexagonal blind rivet studs are intended for applications requiring externally threaded mounting points, one-sided mechanical installation and polygonal body engagement.

For M5, M6 and M8 requirements, customers may submit engineering drawings, material specifications, mounting-hole details and purchasing quantities for technical review.

Request an OEM Technical Quotation

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

Please include your product drawing, required quantity, stainless steel specification, panel thickness, mounting-hole dimensions and installation requirements.

JUXIN FASTENERS — Industrial Fastening Solutions for OEM Engineering and Global Procurement.

Product Packaging — Stainless Steel Open-End Partial Hex Blind Rivet Studs

Packaging for M5, M6 and M8 stainless steel flat head open-end partial hexagonal blind rivet studs is subject to confirmed order and customer requirements.

Protective Packaging: Suitable protective arrangements may be specified to reduce damage to external male threads, flat-head seating surfaces and partial hexagonal body geometry.

Outer Packaging: Carton arrangements can be reviewed according to shipment quantity, weight and handling requirements.

Pallet Packaging: Palletized shipments may be considered for bulk OEM orders, subject to confirmation.

Product Identification: Customer-specified labels may identify the part number, thread size, stainless steel grade, quantity, lot number and drawing revision.

Lot Traceability: Identification and traceability requirements should be defined in the approved purchase and quality documentation.

OEM Packaging: Customer-specific packing quantities, component segregation, labeling and logistics instructions are subject to review.

Final packaging details will be confirmed against the approved order.

For OEM quotations and packaging requirements:

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com