Flanged Tube-Connecting Nuts for Round Tubes

Flanged Tube-Connecting Nuts for Round Metal and Plastic Tubes

Juxin Fasteners manufactures flanged tube-connecting nuts with spring-steel retaining clips for internal threaded connections in round metal and compatible plastic tubing.

These specialized press-fit fasteners combine a central female thread, a wide circular flange and flexible retaining clips that engage the inside wall of a hollow tube.

The flange provides an end-positioning surface, while the spring clips help retain the connector inside the tube without welding.

This design is suitable for tubular furniture manufacturing, adjustable equipment supports, commercial fixtures and custom OEM assemblies requiring an internal threaded mounting point.

Juxin Fasteners supports metric M6, M8 and M10 threads, together with 1/4-20, 5/16-18 and 3/8-16 UNC configurations.

Custom tube-fit dimensions, retaining clip geometry, materials and surface finishes can be evaluated according to customer engineering drawings.

Product Design – Wide-Flange Spring-Clip Tube Nuts

The distinguishing feature of this product is its wide circular flange combined with a spring-clip retaining structure.

The pictured design includes a central internally threaded component and formed steel elements that provide engagement with the tube's internal surface.

Unlike long-barrel cylindrical tube-connecting nuts, this configuration uses a comparatively compact body and a prominent circular flange.

Its principal features include:

• Wide circular flange.

• Central internally threaded steel component.

• Formed spring-steel retaining clips.

• Press-fit installation geometry.

• Compact axial construction.

• Zinc-plated steel surfaces.

• Metric and Unified inch thread options.

• Drawing-based customization for round tubing.

The flange and retaining clips perform different functions.

The flange provides a locating surface at the tube opening, while the clips provide mechanical engagement inside the tube.

The load-bearing contribution of the flange depends on the installation orientation and mating component geometry.

Key Product Features

Wide Circular Flange

The circular flange provides a defined end-positioning surface and may distribute contact pressure against the tube end or an adjacent component.

Flange diameter and thickness can be specified according to the required assembly geometry.

Spring-Clip Retention

Flexible retaining clips engage the internal wall of the tube.

Their geometry is designed to provide resistance to withdrawal and movement after installation.

Internal Machine Thread

The central female thread accepts a compatible bolt, machine screw or threaded stud.

Press-Fit Installation

The connector is designed for installation inside compatible round tubing without welding.

Compact Profile

The wide-flange construction offers an alternative to longer cylindrical tube connectors where installation depth is limited.

Carbon Steel and Spring-Steel Construction

The threaded component and retaining clips provide different mechanical functions.

Zinc-Plated Finish

Zinc plating provides corrosion protection for suitable indoor and moderately humid environments.

OEM Manufacturing Flexibility

Thread dimensions, flange geometry, clip configuration and tube-fit requirements can be customized according to approved drawings.

Technical Specifications – Flanged Tube-Connecting Nuts

Exact tube-fit dimensions, clip hardness, flange dimensions and mechanical performance must be confirmed against the approved product drawing.

Metric Thread Specifications – M6, M8 and M10

M6 Flanged Tube-Connecting Nuts

M6 configurations may be used in compact tubular furniture, display fixtures and equipment accessories where the tube dimensions and retention requirements are suitable.

M8 Flanged Tube-Connecting Nuts

M8 configurations are relevant to medium-size tubular structures, adjustable supports and industrial equipment assemblies.

M10 Flanged Tube-Connecting Nuts

M10 configurations may be evaluated for larger tubular components requiring a larger internal threaded connection.

The suitability of each thread size depends on the tube inside diameter, flange dimensions and retaining clip geometry.

UNC Inch Thread Specifications for North American OEMs

Unified inch threads are commonly specified in North American furniture and industrial equipment manufacturing.

These thread configurations are included in the product family specification. Individual combinations of thread size and tube-fit dimensions require confirmation.

Custom UNF Thread Options

For customers requiring Unified fine threads, Juxin Fasteners can evaluate drawing-based configurations such as:

• 1/4-28 UNF.

• 5/16-24 UNF.

• 3/8-24 UNF.

These are potential custom manufacturing options, not confirmed standard configurations for the pictured product.

Metric and Inch Thread Compatibility

Metric, UNC and UNF threads are not directly interchangeable.

For example:

• M6 × 1.0 is not interchangeable with 1/4-20 UNC.

• M8 × 1.25 is not interchangeable with 5/16-18 UNC.

• M10 × 1.5 is not interchangeable with 3/8-16 UNC.

• 1/4-20 UNC is not interchangeable with 1/4-28 UNF.

The nominal diameter alone does not establish thread compatibility.

All engineering drawings must identify the correct thread designation, pitch and tolerance.

Tube Diameter and Wall Thickness – Critical Selection Parameters

The correct flanged tube-connecting nut must be selected according to the tube geometry, not simply the thread size.

Important parameters include:

• Tube outside diameter (OD).

• Tube inside diameter (ID).

• Tube wall thickness.

• Flange outside diameter.

• Flange thickness.

• Connector body diameter.

• Retaining clip outside diameter.

• Retaining clip angle.

• Retaining clip thickness.

• Overall installed height.

• Thread engagement length.

• Installation depth.

The tube inside diameter is especially important because the retaining clips must engage the tube wall with suitable interference.

Two tubes with the same outside diameter may have different inside diameters because of different wall thicknesses.

For this reason, tube outside diameter alone is not sufficient for selecting the connector.

Common North American Round Tube Diameter References

These dimensions are common tubing references, not a confirmed compatibility table for every Juxin Fasteners flanged tube nut.

Customers should provide the actual tube inside diameter, outside diameter and wall thickness for technical evaluation.

How Flanged Tube-Connecting Nuts Work

The connector is inserted into the open end of a compatible hollow tube.

During installation, the spring-steel retaining clips deflect as they contact the tube's inner wall.

Once installed, the retaining clips engage the tube surface to provide mechanical retention.

The wide flange helps establish the installed position at the tube opening.

A compatible threaded stud or bolt can then be installed into the central female thread.

The connector's retention depends on the interaction between the spring clips and the tube material.

Important factors include:

• Tube inside diameter.

• Tube material.

• Tube wall thickness.

• Retaining clip geometry.

• Clip hardness.

• Installation force.

• Surface finish.

• Applied axial load.

• Applied tightening torque.

The connector should not be assigned a universal pull-out or rotational resistance rating without testing.

Installation Procedure – Flanged Tube-Connecting Nuts

Step 1 – Verify Tube Dimensions

Confirm the actual tube inside diameter, outside diameter and wall thickness.

Step 2 – Inspect the Tube Opening

Check for excessive burrs, deformation, sharp edges or surface damage.

Step 3 – Align the Connector

Position the threaded connector concentrically with the tube opening.

Step 4 – Apply Controlled Installation Force

Press the connector into the tube using an appropriate installation fixture.

The retaining clips deflect and engage the tube's internal wall.

Step 5 – Verify Flange Seating

Confirm that the flange reaches the specified installation position.

Step 6 – Install the Mating Fastener

Engage the correct bolt or threaded stud and apply the validated installation torque.

Installation force and tightening torque should be established using the actual tube and connector combination.

Spring-Steel Retaining Clips – Material and Function

The retaining clips provide the mechanical engagement required for press-fit installation.

The specified 65Mn spring steel can provide useful spring properties when appropriately processed and heat-treated.

Important manufacturing considerations include:

• Material thickness.

• Clip forming accuracy.

• Heat-treatment conditions.

• Hardness.

• Elastic recovery.

• Fatigue behavior.

• Surface protection.

• Edge geometry.

The actual hardness and heat-treatment requirements must be defined by the approved manufacturing specification.

Carbon Steel Threaded Component

The carbon steel threaded component provides the female thread for the mating bolt or stud.

Important engineering considerations include:

• Steel grade.

• Thread tolerance.

• Effective thread engagement.

• Thread stripping resistance.

• Dimensional accuracy.

• Surface finish.

• Assembly alignment.

The central threaded component and spring-steel retaining clips serve different functions and require appropriate material selection.

Zinc-Plated Finish and Corrosion Resistance

Zinc plating is commonly used for steel fastening components requiring corrosion protection.

For flanged tube-connecting nuts, zinc plating may be suitable for indoor applications and environments involving occasional humidity.

Corrosion performance depends on:

• Zinc coating thickness.

• Passivation treatment.

• Surface preparation.

• Installation damage.

• Environmental exposure.

• Contact with dissimilar metals.

For customer-defined corrosion testing, ASTM B117 may be used where applicable.

Salt spray performance must be verified against the specified coating system and acceptance criteria.

Standard zinc plating should not automatically be considered suitable for continuous outdoor or marine exposure.

Flanged Tube-Connecting Nuts vs. Other Tube Connector Designs

Juxin Fasteners manufactures different tube-connecting nut configurations for different installation and retention requirements.

These designs should not be treated as directly interchangeable without verifying tube dimensions, installation geometry and mechanical performance.

Flanged Tube Nuts vs. Welded Tube Nuts

Flanged press-fit tube nuts provide an internal threaded connection without welding.

Welded tube nuts require a suitable welding process and compatible base materials.

Potential advantages of press-fit installation include:

• Elimination of welding operations for the connector.

• Reduced welding-related heat exposure.

• Compatibility with suitable nonweldable tube materials.

• Simplified installation in certain tubular assemblies.

• Repeatable positioning using appropriate fixtures.

However, press-fit retention and welded joint strength are not directly equivalent.

The appropriate fastening method depends on the mechanical and environmental requirements of the assembly.

Industrial Applications – Tubular Furniture Manufacturing

Flanged tube-connecting nuts are relevant to manufacturers of metal tubular furniture and related components.

Potential applications include:

• Metal chair frames.

• Office furniture.

• Tubular table legs.

• Commercial seating components.

• Modular furniture supports.

• Metal shelving.

• Furniture mounting accessories.

The flange may provide a useful locating surface where the connector is installed at the end of a round tube.

The complete furniture joint must be evaluated for its intended loading conditions.

Adjustable Furniture Supports and Leveling Feet

Tubular furniture and equipment frequently use threaded studs for adjustable feet or leveling components.

Flanged tube-connecting nuts may provide an internal threaded attachment point for compatible studs.

Important considerations include:

• Axial loading.

• Stud thread size.

• Thread engagement.

• Tube wall strength.

• Connector retention.

• Flange contact geometry.

• Stability under repeated adjustment.

Not every flanged tube nut is suitable for load-bearing leveling feet.

The assembly must be validated according to the required load and safety conditions.

Office Furniture and Commercial Equipment

Potential applications include:

• Office desk supports.

• Tubular furniture legs.

• Commercial seating accessories.

• Modular office equipment.

• Equipment mounting brackets.

• Adjustable support components.

For OEM manufacturers, repeatable tube dimensions and consistent installation processes are important for efficient production.

Retail Displays and Store Fixtures

Round metal tubing is widely used in commercial display systems.

Potential applications include:

• Retail display stands.

• Exhibition fixtures.

• Product display frames.

• Modular store fixtures.

• Display shelving supports.

• Removable tubular components.

Press-fit threaded connectors may simplify the installation of suitable threaded accessories.

Industrial Machinery and Equipment Frames

Flanged tube-connecting nuts may be evaluated for selected tubular machinery accessories and equipment structures.

Potential applications include:

• Equipment stands.

• Tubular support frames.

• Machine accessories.

• Removable equipment brackets.

• Assembly workstations.

• Industrial fixtures.

Applications involving significant dynamic loading or personnel safety require specific engineering validation.

Fitness and Recreational Equipment

Tubular structures are commonly used in fitness and recreational equipment.

Potential applications include:

• Equipment accessories.

• Removable tubular attachments.

• Adjustment components.

• Noncritical support structures.

• Equipment stands.

The connector should not be used in safety-critical or highly loaded connections without appropriate mechanical testing.

Medical Equipment Accessories

Some medical equipment accessories use round tubular structures.

Flanged tube-connecting nuts may be considered for suitable noncritical brackets, removable accessories and equipment supports.

Patient-supporting or safety-critical connections require application-specific qualification.

Automotive and Transportation Equipment

Flanged tube-connecting nuts may be evaluated for selected automotive accessories and transportation equipment components.

Potential applications include:

• Noncritical tubular brackets.

• Interior equipment supports.

• Removable tubular accessories.

• Custom equipment mounting components.

Automotive applications involving vibration, fatigue, crash loading or occupant safety require additional engineering approval.

Outdoor Furniture and Garden Equipment

Round tubular components are used in outdoor furniture and garden equipment.

Potential applications include:

• Garden furniture frames.

• Outdoor equipment accessories.

• Tubular support structures.

• Removable frame attachments.

Outdoor applications require careful evaluation of corrosion protection, moisture exposure and long-term retention.

Engineering Considerations for Mechanical and Structural Engineers

Flange Diameter

The flange diameter affects seating geometry and the available contact area.

Flange Thickness

Flange thickness influences the component profile and potential resistance to local deformation.

Tube Inside Diameter

The tube inside diameter determines whether the retaining clips can engage correctly.

Tube Wall Thickness

Wall thickness affects the tube's resistance to deformation during installation and service.

Axial Pull-Out Resistance

The retaining clips must resist withdrawal under the expected axial loading.

Rotational Resistance

The installed connector must resist rotation during bolt tightening.

Thread Engagement

The central female thread must provide adequate engagement with the mating fastener.

Installation Force

The installation process must not cause unacceptable tube or connector damage.

Vibration Resistance

The complete assembly must be tested where vibration is a significant service condition.

Repeated Assembly

The threaded connection should be evaluated for the required number of installation and removal cycles.

Recommended OEM Mechanical Testing

Depending on the application, testing may include:

• Installation force measurement.

• Axial pull-out testing.

• Rotational resistance testing.

• Thread stripping resistance.

• Flange deformation inspection.

• Tube wall deformation inspection.

• Bolt tightening torque testing.

• Vibration testing.

• Fatigue testing.

• Corrosion testing.

• Repeated assembly testing.

Testing should use the actual production tube material, dimensions and connector configuration.

OEM Manufacturing – Juxin Fasteners

Juxin Fasteners is an industrial fastener manufacturer supporting OEM and ODM production of specialized metal fastening components.

Our manufacturing capabilities combine cold heading, cold forming, CNC machining and secondary metalworking operations.

For flanged tube-connecting nuts, the manufacturing route is selected according to the approved geometry, material requirements, production quantity and dimensional tolerances.

Depending on the product design, manufacturing may involve:

• Steel component forming.

• Precision internal threading.

• Spring-steel stamping.

• Retaining clip forming.

• Heat treatment where specified.

• Component assembly.

• Zinc plating.

• Dimensional inspection.

• Functional fit verification.

Custom Manufacturing Options

Juxin Fasteners can evaluate custom requirements for:

• Metric M6, M8 and M10 threads.

• UNC inch threads.

• Custom UNF threads.

• Flange outside diameter.

• Flange thickness.

• Connector overall height.

• Thread engagement length.

• Retaining clip diameter.

• Retaining clip thickness.

• Retaining clip geometry.

• Spring-steel material.

• Spring hardness.

• Tube inside diameter.

• Tube outside diameter.

• Tube wall thickness.

• Zinc-plating requirements.

• Custom packaging.

• OEM part identification.

All custom configurations are subject to engineering and manufacturing feasibility review.

Quality Control and Inspection

Inspection requirements may include:

• Internal thread GO/NO-GO gauge inspection.

• Flange diameter measurement.

• Flange thickness measurement.

• Overall height inspection.

• Retaining clip geometry inspection.

• Material verification.

• Spring hardness testing where specified.

• Surface finish inspection.

• Coating thickness inspection where specified.

• Installation fit verification.

• Pull-out resistance testing where required.

• Rotational resistance testing where required.

• Batch identification.

• Drawing revision control.

Metric threads should follow the specified ISO thread requirements.

Unified inch threads may be specified according to ASME B1.1.

Final inspection criteria must follow the approved customer drawing.

Production Efficiency for OEM Assembly

For manufacturing engineers and production managers, properly selected flanged tube-connecting nuts can support efficient tubular assembly processes.

Potential benefits include:

• Reduced welding operations.

• Repeatable flange seating.

• Controlled installation depth.

• Consistent thread positioning.

• Simplified installation fixtures.

• Reduced secondary machining.

• Stable batch dimensions.

• Efficient dimensional inspection.

• Repeatable assembly procedures.

Actual production efficiency depends on the product geometry, tube material, installation equipment and production volume.

International OEM Procurement and Supply

Juxin Fasteners supports international B2B customers requiring flanged tube-connecting nuts and customized threaded tube components.

Our manufacturing programs are relevant to:

• Tubular furniture manufacturers.

• Commercial seating manufacturers.

• Industrial equipment manufacturers.

• Metal fabrication companies.

• Retail fixture manufacturers.

• Equipment frame manufacturers.

• Automotive component manufacturers.

We support technical and purchasing inquiries from:

• Design engineers.

• Mechanical and structural engineers.

• Manufacturing engineers.

• Production managers.

• Procurement development specialists.

• Purchasing specialists.

• Procurement managers.

• Supply chain managers.

Juxin Fasteners supports OEM manufacturing customers in North America, South America, Europe and other international markets.

Frequently Asked Questions

What are flanged tube-connecting nuts?

Flanged tube-connecting nuts are internally threaded fasteners with a circular flange and retaining features designed for installation inside compatible hollow tubing.

What is the purpose of the wide flange?

The flange provides an end-positioning surface and may help distribute contact pressure when supported by the assembly geometry.

How are flanged tube-connecting nuts installed?

They are pressed into compatible round tubing using an appropriate installation tool or fixture.

Do these connectors require welding?

No. The intended installation method uses mechanical engagement between the retaining clips and the tube wall.

Can they be used in plastic tubing?

They may be suitable for selected plastic tubes when the material, dimensions and retention requirements have been verified.

What metric thread sizes are available?

The product family includes M6, M8 and M10 configurations.

What inch thread sizes are available?

The specified Unified coarse thread configurations include 1/4-20, 5/16-18 and 3/8-16 UNC.

Can Juxin Fasteners manufacture custom UNF threads?

Custom Unified fine-thread configurations can be evaluated according to customer drawings and manufacturing requirements.

Are metric and inch threads interchangeable?

No. Metric, UNC and UNF threads have different dimensions and pitches.

Are flanged tube nuts stronger than star-type tube nuts?

Not necessarily. Retention performance depends on the connector design, tube dimensions, materials and loading conditions.

Can flanged tube-connecting nuts be used for adjustable furniture feet?

They may be suitable for certain adjustable furniture support assemblies when the load requirements and connector retention have been validated.

What determines the pull-out strength?

Pull-out resistance depends on retaining clip geometry, tube inside diameter, tube material, interference and installation conditions.

Can Juxin Fasteners manufacture custom flange diameters?

Yes. Drawing-based flange dimensions can be evaluated according to the required application and production feasibility.

What information is required for an OEM quotation?

Please provide the tube inside diameter, outside diameter, wall thickness, thread size, flange dimensions, material requirements, surface finish, expected mechanical performance and estimated annual purchasing quantity.

Request an OEM Manufacturing Quote – Flanged Tube-Connecting Nuts

Juxin Fasteners manufactures flanged tube-connecting nuts for threaded connections inside round metal and compatible plastic tubing.

Our manufacturing services support custom flange geometry, spring-steel retaining components, metric and Unified inch threads, zinc-plated finishes, dimensional inspection and repeat-order batch production.

For technical evaluation and quotation, please provide your 2D/3D engineering drawings, tube dimensions, thread specifications, material requirements and estimated annual purchasing quantity.

Manufacturer: Juxin Fasteners

Product: Flanged Tube-Connecting Nuts for Round Tubes

Materials: Carbon Steel + 65Mn Spring Steel

Metric Threads: M6, M8, M10

Inch Threads: 1/4-20, 5/16-18, 3/8-16 UNC

Installation: Internal Press Fit

Retaining Design: Spring-Steel Clips

Flange: Wide Circular Flange

Surface Finish: Zinc Plating

Manufacturing: OEM / ODM, Drawing-Based Custom Manufacturing and Batch Production

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com

Send your engineering drawings, tube inside diameter, wall thickness, thread specifications and estimated annual demand to request a custom flanged tube-connecting nut manufacturing quotation from Juxin Fasteners.

Packaging Standard

At Juxin Fasteners, we apply standardized export packaging to ensure product protection, traceability, and compliance with international logistics requirements.

1. Standard Export Packaging

Unless otherwise specified, all products will be packed according to our factory standard export packaging, which includes:

Moisture-resistant inner protection

Poly bag or small box packing as required

Reinforced export cartons

Clear labeling with part number, specification, batch number, and quantity

Palletizing for sea or air shipment when necessary

Our standard packaging is designed to ensure safe transportation, efficient warehousing, and long-distance international shipping.

2. Customized Packaging Options

We also provide customized packaging solutions according to customer requirements, including but not limited to:

Private labeling

Customized barcodes

Specific carton dimensions

Retail packaging

Special pallet configuration

Customer-specific marking and identification

So that you know, customized packaging may involve additional costs and extended lead time depending on the complexity of the requirements.

3. Compliance & Quality Assurance

All packaging processes are controlled under our ISO 9001 quality management system to ensure consistency, traceability, and product integrity throughout the supply chain.