Flat Head Open-End Knurled Body Steel Blind Rivet Nuts

Technical Specifications — Knurled Steel Blind Rivet Nuts

Product Identification

Metric Thread Sizes and US Inch Reference

The following table provides standard ISO metric coarse thread pitches and approximate inch equivalents.

These values are dimensional references only. ISO metric threads are not interchangeable with UNC or UNF threads.

Applicable metric thread references may include ISO 261, ISO 724, and ISO 965, subject to the approved drawing.

Imperial Thread Requirements — US OEM Applications

The existing product information also lists several Unified inch thread sizes.

The following designations should be confirmed against the applicable product drawings before being treated as available catalog specifications.

An additional designation in the original information, 5/15-18, requires clarification and has not been included as a confirmed specification.

Unified inch threads should be defined according to applicable ASME B1.1 requirements.

Metric and Unified thread systems must not be substituted for one another without engineering approval.

Grip Range — Metric and Imperial Reference

The published product-series grip range is 0.5–6.5 mm (approximately 0.020–0.256 in).

These are conversion references, not approved grip ranges for individual part numbers.

Each selected configuration must be checked against its technical drawing.

Engineering Selection and Installation Guide

1. How Knurling Improves Anti-Rotation Engagement

The knurled surface creates local geometric features along the rivet nut body.

During installation, these features may engage the surrounding panel material and increase resistance to rotation.

The effectiveness of this engagement depends on:

• Knurl depth and profile

• Panel material hardness

• Mounting hole diameter and tolerance

• Installation stroke or force

• Rivet nut body deformation

• Grip range

• Surface coating condition

A knurled rivet nut should not automatically be considered suitable for high-torque applications without testing.

2. Knurled Body Versus Smooth Body

Actual performance must be evaluated under representative assembly conditions.

3. Mounting Hole Diameter and Tolerance

Mounting hole preparation is critical to the performance of knurled rivet nuts.

An oversized hole may prevent sufficient engagement between the knurled surface and panel material.

An undersized hole may damage the coating, interfere with insertion, or cause excessive local deformation.

Engineers should verify:

• Nominal hole diameter

• Hole tolerance

• Hole roundness

• Burr condition

• Panel thickness

• Panel material hardness

• Knurl outer diameter

Use the approved product drawing to determine the correct hole dimensions.

4. Panel Material and Knurl Engagement

Knurled rivet nuts can behave differently in steel, aluminum, and other mounting materials.

Relatively soft materials may allow greater local engagement with the knurled surface, but they may also deform under installation or tightening loads.

Harder panels may provide different retention behavior and require careful setting process control.

For plastic or composite materials, evaluate local damage, creep, and long-term retention before approval.

5. Spin-Out Torque and Repeated Assembly

Spin-out resistance is the ability of an installed rivet nut to resist rotation relative to the mounting panel.

It is especially important when the mating screw is repeatedly tightened or removed.

For OEM validation, consider testing:

• Initial spin-out torque

• Spin-out behavior after repeated assembly

• Panel deformation

• Thread integrity

• Installation consistency

• Performance under representative service conditions

Acceptance criteria should be established according to the intended joint design.

6. Pull-Out Resistance and Flange Support

Pull-out resistance depends on the installed backside deformation, panel material, hole geometry, and rivet nut dimensions.

The flat head provides a bearing surface against the mounting panel.

However, the flange alone does not determine the complete joint's axial strength.

For thin or soft panels, evaluate local bearing deformation and possible pull-through.

7. Grip Range and Panel Thickness

The published grip range is 0.5–6.5 mm (approximately 0.020–0.256 in) across the product series.

Individual sizes and body lengths may have different approved grip ranges.

For multilayer assemblies, verify the combined thickness and intended clamping configuration.

Do not assume that every thread size covers the complete published range.

8. Installation Procedure

1. Confirm the selected rivet nut matches the approved drawing.

2. Prepare the specified mounting hole.

3. Remove burrs and inspect the panel surface.

4. Select a compatible rivet nut setting mandrel.

5. Insert the knurled body into the mounting hole.

6. Seat the flange against the panel.

7. Hold the installation tool perpendicular to the surface.

8. Apply the approved setting stroke or force.

9. Inspect the backside deformation and flange seating.

10. Verify thread integrity and rotational retention where required.

Manual, pneumatic, or automated installation methods may be considered when compatible with the selected product and approved process.

9. Open-End Thread Engagement

The open-end design allows a mating screw to extend through the threaded barrel when sufficient backside clearance exists.

Engineers should verify:

• Mating screw length

• Thread engagement

• Clamped component thickness

• Backside clearance

• Interference with adjacent components

Open-end rivet nuts do not provide an inherently sealed threaded connection.

10. Color Zinc Plating and Corrosion Protection

The specified surface treatment is color zinc plating.

For OEM purchasing, coating requirements should define:

• Zinc coating thickness

• Passivation chemistry

• Additional sealing or topcoat requirements

• Corrosion test method and acceptance criteria

• Environmental exposure conditions

• Applicable restricted-substance requirements

ASTM B633 or ISO 2081 may be referenced where technically applicable.

Coating appearance alone does not establish corrosion resistance or regulatory conformity.

11. Galvanic Compatibility in Aluminum Panels

When zinc-plated steel rivet nuts are installed in aluminum panels, the complete assembly should be evaluated for galvanic corrosion risk.

Potential concerns include:

• Dissimilar metal contact

• Moisture exposure

• Coating damage during installation

• Exposed panel edges

• Long-term environmental conditions

Where necessary, protective coatings, isolation measures, or alternative materials should be evaluated.

12. OEM Validation and Inspection

Representative production validation may include:

• Mounting hole inspection

• Knurl geometry inspection

• Installation stroke or force verification

• Backside deformation inspection

• Flange seating

• Thread integrity

• Spin-out torque

• Axial pull-out resistance

• Repeated screw assembly

• Panel deformation

• Coating condition

• Corrosion testing where specified

Mechanical performance requirements should be defined by the OEM application rather than assumed from the rivet nut body style.

Technical Drawings and CAD

The existing JUXIN FASTENERS product information references detailed specification PDF pages 91–92 and related CAD documentation.

The applicable drawing should be reviewed to confirm individual dimensions, mounting hole tolerances, knurl geometry, body length, flange dimensions, and grip range.

OEM Technical RFQ Checklist

For accurate quotation and engineering review, please provide:

• Required metric or Unified inch thread size

• Panel material and thickness, in mm or inches

• Mounting hole diameter and tolerance

• Required grip range

• Flange dimensions

• Knurl geometry requirements, if specified

• Mating screw size and tightening torque

• Spin-out and pull-out performance requirements

• Zinc coating and corrosion requirements

• Approved drawing or CAD model

• Inspection and documentation requirements

• Sample quantity

• Initial order quantity and annual demand forecast

JUXIN FASTENERS supports drawing-based sourcing inquiries for standard and custom industrial blind rivet nut requirements.

Why Choose Knurled Body Blind Rivet Nuts?

A conventional smooth-body rivet nut relies primarily on the installed deformation and contact with the mounting panel to resist rotation.

A knurled-body rivet nut incorporates surface features that can engage the surrounding material and provide additional resistance to turning.

This distinction can be important in assemblies involving repeated screw installation, maintenance access, or relatively high tightening torque.

However, knurling does not guarantee a particular spin-out torque. Actual performance depends on the knurl geometry, panel material,

 hole tolerance, grip range, and installation conditions.

Typical Industrial Applications

Automotive and Transportation Components

Knurled steel rivet nuts may be considered for interior brackets, equipment covers, sheet metal housings, and non-critical fastening points requiring repeated screw assembly.

For vibration-exposed applications, verify the complete joint design and retention performance.

Electrical Enclosures and Control Cabinets

These threaded inserts can provide attachment points for removable panels, mounting brackets, and internal accessories.

Knurled-body engagement may be beneficial where repeated tightening could otherwise cause an installed insert to rotate.

Industrial Machinery and Equipment

Applications may include fabricated steel covers, equipment guards, brackets, access panels, and machine housings.

One-sided installation is particularly useful when the reverse side of the mounting material cannot be reached.

HVAC and Refrigeration Equipment

Potential uses include equipment housings, support brackets, access covers, and fabricated sheet metal components.

Material selection and corrosion protection should reflect the actual service environment.

Rail Vehicle Interior Equipment

Knurled rivet nuts may be considered for selected non-structural interior equipment and removable panels, subject to project-specific engineering approval.

Rail applications may require additional vibration, mechanical retention, material, and documentation requirements.

General Sheet Metal Fabrication

Knurled blind rivet nuts can be considered where thin material does not provide sufficient thread engagement 

for direct tapping and conventional nut installation is impractical.

Knurled Versus Smooth Body Selection

Choose a knurled-body configuration when additional anti-rotation engagement may be beneficial.

A smooth-body configuration may be suitable when installation loads, panel material, and rotational retention requirements permit.

Neither design should be selected solely on appearance.

Engineering validation should consider the mounting hole, panel material, installation method, and required tightening torque.

OEM Engineering and Procurement Support

JUXIN FASTENERS supports drawing-based sourcing and industrial bulk purchasing requirements for knurled steel blind rivet nuts.

Engineering teams can submit installation drawings, panel thickness, hole tolerances, retention requirements, and mating screw specifications.

Purchasing managers and supplier development teams can provide approved drawings, order quantities, 

annual demand forecasts, coating requirements, inspection specifications, and delivery requirements.

Request an OEM Quotation

For flat head knurled steel blind rivet nuts, custom threaded inserts, and industrial purchasing requirements, contact:

JUXIN FASTENERS

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

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

Please send your technical drawing, product specifications, and purchasing requirements for review and quotation.

Packaging & OEM Ordering — Knurled Steel Blind Rivet Nuts

Standard Export Packaging

JUXIN FASTENERS provides industrial export packaging for knurled steel blind rivet nuts to support product protection, handling, storage, and international transportation.

The standard packaging arrangement includes protective inner plastic bags, outer cartons, and palletized shipment where required.

Reference Packaging Dimensions

These dimensions are reference packaging sizes. Actual carton quantities, dimensions, and pallet arrangements are confirmed according to product size and purchase order requirements.

Product Protection and Identification

Packaging arrangements may include:

• Protective plastic inner bags

• Reinforced export cartons

• Moisture-resistant protection where required

• Product identification labels

• Part number and specification marking

• Batch identification

• Quantity labels

• Palletized shipment where required

Packaging and identification requirements should be agreed before order confirmation.

Customized OEM Packaging

Customer-specific packaging options can be reviewed, including:

• Private labeling

• Customized barcode labels

• Customer part-number identification

• Specified carton dimensions

• Customer-defined packing quantities

• Special pallet configurations

• Customer-specific marking and traceability requirements

Customized packaging may involve additional costs or lead times depending on the agreed requirements.

OEM and Industrial Bulk Purchasing

JUXIN FASTENERS supports purchasing inquiries from OEM manufacturers, strategic sourcing teams,

 supplier development professionals, and industrial equipment manufacturers.

For quotation review, please provide:

• Required thread size and product configuration

• Approved technical drawing and revision

• Material and coating requirements

• Panel thickness and grip range

• Installation and mechanical performance requirements

• Inspection and documentation requirements

• Packaging and labeling specifications

• Initial order quantity

• Annual demand forecast

• Requested delivery schedule

Sample availability, minimum order quantity, pricing, production lead time, and ordering conditions are confirmed during quotation review.

Request an OEM Quotation

For knurled steel blind rivet nuts, custom threaded inserts, and industrial bulk purchasing requirements, contact:

JUXIN FASTENERS

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

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

Please send your technical drawing, specifications, and purchasing requirements for review and quotation.