Three-Hole Screw-Mount Nuts with Threaded Barrel

Three-Hole Screw-Mount Nuts with Threaded Barrel

Round-Flange Threaded Mounting Nuts for Furniture, Sheet Metal and OEM Assemblies

Juxin Fasteners manufactures three-hole screw-mount nuts with threaded barrels for furniture manufacturers, sheet metal fabricators, industrial equipment builders and global OEM assembly operations.

These fastening components combine a round mounting flange, three attachment holes and an internally threaded cylindrical barrel.

The mounting holes allow the nut to be secured to a compatible component using screws or rivets. The threaded barrel provides a connection point for a mating bolt or stud.

Unlike conventional hex nuts, screw-mount nuts can be mechanically attached to a supporting surface, providing a fixed threaded connection where access to a loose nut may be inconvenient.

Juxin Fasteners is an industrial fastener manufacturer supporting OEM/ODM made-to-drawing production.

Our manufacturing capabilities include cold heading, cold forming, CNC machining and product-specific secondary operations selected according to material, geometry, tolerances and production quantity.

Product Specifications

Final dimensions, tolerances, material grades and mechanical performance must be confirmed against the approved engineering drawing.

What Are Three-Hole Screw-Mount Nuts?

A screw-mount nut is an internally threaded fastener with an integral mounting base.

In this configuration, the base is circular and contains three attachment holes distributed around a central threaded barrel.

The flange is attached to a supporting component using screws or rivets.

Once secured, the barrel provides a threaded connection for a bolt or stud.

This arrangement is useful in applications where a conventional loose nut would be difficult to position or retain during assembly.

The actual load capacity depends on the nut geometry, mounting fasteners, supporting material and complete joint design.

Key Engineering Features

Three-Hole Mounting Pattern

The three mounting holes provide locations for mechanical attachment to the supporting structure.

The mounting-hole diameter, bolt-circle diameter and angular positions should be defined by the approved drawing.

A three-hole arrangement can provide resistance to rotation when properly attached, but its effectiveness depends on the attachment design and installation quality.

Round Mounting Flange

The circular flange provides a mounting surface surrounding the threaded barrel.

Its diameter and thickness influence the contact area, local stiffness and load transfer into the supporting component.

A larger flange can provide a greater potential load-distribution area, but the actual stress distribution must be evaluated for the specific assembly.

Internally Threaded Barrel

The raised cylindrical barrel provides space for the internal thread.

Barrel height and usable thread length affect the available thread engagement.

Increasing barrel length can provide additional thread engagement, but it does not automatically increase the strength of the complete assembly.

Material properties, thread quality, fastener strength and mounting attachment must also be considered.

Mechanical Attachment

Screw-mount nuts can be installed with suitable screws or rivets.

This makes them useful where welding is undesirable, inaccessible or incompatible with the supporting material.

Two Installation Orientations

Depending on the component design, the threaded barrel can be inserted through a prepared hole or positioned outward from the supporting surface.

The correct orientation depends on clearance, accessibility, bolt length and assembly requirements.

How Screw-Mount Nuts Are Installed

Method 1 — Barrel Through a Prepared Hole

A clearance hole is prepared in the supporting component to accommodate the threaded barrel.

The barrel is inserted through the hole, and the flange is secured with screws or rivets.

This configuration can reduce barrel protrusion on the flange side of the assembly.

The supporting material must provide adequate edge distance, attachment strength and clearance.

Method 2 — Barrel Facing Outward

The flange is positioned directly against the supporting surface with the threaded barrel projecting outward.

The three mounting holes are used to secure the base.

This arrangement provides an accessible raised threaded connection.

The supporting component must be designed to accommodate the flange and the attachment loads.

Metric Thread Sizes

Juxin Fasteners identifies the following metric thread sizes for this product family.

The table provides standard coarse-thread references. Actual thread pitch, tolerance and dimensions must be verified for each product.

Metric fine-thread configurations can be evaluated for custom OEM projects.

Unified Inch-Thread Sizes for North American OEMs

The following UNC thread sizes are identified for this product family.

Additional inch-thread configurations may be evaluated according to customer drawings.

Metric and UNC threads are not interchangeable.

For example, M6 × 1.0 and 1/4-20 UNC have different diameters and thread pitches, despite their similar nominal sizes.

Carbon Steel Screw-Mount Nuts

Carbon steel is an option for screw-mount nuts used in industrial furniture, equipment mounting and general mechanical assemblies.

The selected steel grade should provide suitable forming or machining characteristics and meet the finished component's mechanical requirements.

Important engineering considerations include:

• Material grade

• Barrel wall thickness

• Thread engagement

• Flange thickness

• Attachment-hole strength

• Surface protection

• Operating environment

The mechanical performance of the finished component must be verified against the actual specification.

Zinc-Plated Steel Screw-Mount Nuts

Zinc plating provides sacrificial corrosion protection for carbon steel.

It is commonly considered for indoor equipment, general industrial hardware and applications involving occasional moisture.

Corrosion performance depends on coating thickness, passivation, environmental exposure and any supplementary treatment.

A zinc-plated finish should not be assumed suitable for continuous wet, marine or aggressive chemical exposure without appropriate testing.

Stainless Steel Screw-Mount Nuts

Stainless steel may be selected where corrosion resistance is a significant design requirement.

Potential material options include 304-type and 316-type stainless steels, subject to engineering review.

304-type stainless steel is commonly used in general industrial and outdoor environments.

316-type stainless steel may provide improved resistance to certain chloride-containing environments.

The exact material grade and mechanical requirements should be specified by the customer.

Screw-Mount Nuts for Furniture Manufacturing

Furniture manufacturers often require fixed threaded connection points for components that are assembled repeatedly or accessed from one side.

Potential applications include:

• Furniture frame connections

• Table and desk support assemblies

• Furniture leg mounting

• Seating support hardware

• Modular furniture structures

• Adjustable furniture accessories

• Commercial furniture fixtures

A three-hole mounting nut can be evaluated where a mechanically attached threaded connection is appropriate.

For wood-based furniture, the attachment screws, substrate strength, edge distances and pull-out resistance must be validated.

Furniture Leg and Leveling Foot Connections

Threaded mounting components are frequently used to attach furniture legs, adjustable feet and leveling mechanisms.

A screw-mount nut may provide a fixed threaded interface for a compatible stud.

Important selection factors include:

• Mating stud diameter

• Thread engagement

• Barrel height

• Flange diameter

• Mounting-hole pattern

• Supporting material

• Axial and lateral loading

• Repeated adjustment

For adjustable feet, the design must also account for bending loads and service conditions.

Sheet Metal Fabrication and Equipment Enclosures

Thin sheet metal components may not provide sufficient thickness for a directly tapped thread.

A screw-mount nut can provide a separate threaded component secured to the sheet metal.

Potential applications include:

• Electrical enclosure accessories

• Equipment panels

• Control cabinet components

• Sheet metal brackets

• Industrial chassis assemblies

• Mechanical support hardware

The mounting screws or rivets must be suitable for the sheet thickness and expected loading.

Industrial Machinery and Equipment

Three-hole screw-mount nuts can be evaluated for mechanical equipment requiring fixed threaded mounting locations.

Potential applications include:

• Equipment guards

• Auxiliary mounting brackets

• Mechanical supports

• Instrument fixtures

• Machine covers

• Serviceable equipment components

The attachment system must be validated for vibration, fatigue and mechanical loading.

Industrial Automation and Robotics

Automation equipment often contains compact assemblies where installation access is limited.

Screw-mount nuts may be considered for:

• Sensor brackets

• Control equipment mounts

• Fixture components

• Protective covers

• Auxiliary mechanical supports

Dynamic loads and maintenance requirements should be considered during fastener selection.

Electrical Equipment and Power Distribution

Potential applications include mechanical attachments in:

• Electrical cabinets

• Control panels

• Power distribution enclosures

• UPS equipment

• Power electronics housings

These applications require appropriate evaluation of mechanical strength, electrical clearance, corrosion resistance and grounding requirements.

A screw-mount nut should not automatically be considered an approved electrical bonding component.

AI Data Centers and Server Cabinets

Screw-mount nuts may be evaluated for selected mechanical mounting applications in data center equipment.

Examples include:

• Server cabinet accessories

• Equipment mounting brackets

• Cable management hardware

• Cooling equipment supports

• Maintenance-access panels

Selection should consider assembly accessibility, installation repeatability, material compatibility and vibration.

HVAC and Thermal Management Equipment

Potential applications include:

• Equipment enclosures

• Ventilation system brackets

• Mechanical control accessories

• Cooling equipment supports

• Serviceable panel hardware

Condensation and moisture exposure should be considered when selecting the material and finish.

Energy Storage and Industrial Electrification

Three-hole threaded mounting components may be suitable for selected noncritical mechanical assemblies in energy storage and industrial electrical equipment.

The approved design must address mechanical loads, electrical clearance, corrosion and environmental conditions.

Custom Round-Flange Mounting Nut Designs

Juxin Fasteners supports customer-specific designs for industrial OEM manufacturing.

Customization may include:

• Metric coarse threads

• Metric fine threads

• UNC or UNF threads

• Flange outside diameter

• Flange thickness

• Barrel outside diameter

• Barrel height

• Usable thread length

• Mounting-hole diameter

• Mounting-hole bolt circle

• Hole orientation and spacing

• Carbon steel or stainless steel material

• Surface finish

• Dimensional tolerances

• Thread tolerance

• Packaging requirements

Manufacturing feasibility depends on the final geometry, material and production quantity.

Screw-Mount Nuts vs. Weld Nuts

Screw-mount nuts use mechanical fasteners such as screws or rivets to secure the mounting base.

Weld nuts are designed for attachment through an approved welding process.

Some commercial screw-mount nut designs incorporate welding projections, but this feature must be specifically identified in the drawing.

The photographed three-hole product does not establish the presence of welding projections.

Therefore, welding capability should not be assumed for this configuration.

Screw-Mount Nuts vs. Rivet Nuts

A conventional rivet nut is generally installed by deforming part of its body inside a prepared hole.

A three-hole screw-mount nut is secured using separate mounting screws or rivets.

These installation methods have different tooling, access and load-transfer requirements.

Screw-Mount Nuts vs. Self-Clinching Nuts

Self-clinching nuts are installed through controlled displacement of a compatible sheet material.

Three-hole screw-mount nuts are attached mechanically through their mounting flange.

The appropriate design depends on sheet thickness, substrate material, installation equipment, access and mechanical loading.

Screw-Mount Nuts vs. Furniture T-Nuts

Pronged furniture T-nuts typically use pointed features to engage wood-based materials.

Three-hole screw-mount nuts use separate mechanical fasteners through the mounting flange.

They should not be treated as direct substitutes without engineering review.

Engineering Design Considerations

Flange Diameter

The flange diameter affects available attachment area, mounting-hole placement and contact with the supporting surface.

Flange Thickness

Flange thickness affects stiffness and local deformation under loading.

Barrel Height

Barrel height influences available thread engagement and installation clearance.

Thread Engagement

Thread engagement must be adequate for the specified bolt and load.

Mounting-Hole Pattern

The three mounting holes must match the supporting component.

Fastener Selection

Mounting screws or rivets must be selected according to substrate thickness, material and loading.

Assembly Orientation

The barrel direction must be compatible with the mating component and assembly sequence.

Corrosion Protection

The selected material and coating must suit the operating environment.

Manufacturing and Production Engineering

Juxin Fasteners is an industrial fastener manufacturer supporting standard and custom fastening components.

Our manufacturing capabilities include:

• Cold heading

• Cold forming

• CNC machining

• Product-specific secondary manufacturing operations

• OEM/ODM made-to-drawing production

• Industrial batch manufacturing

The appropriate production route depends on component geometry, material, tolerances and production requirements.

Where technically appropriate, multiple manufacturing processes may be combined.

The actual process must be confirmed during engineering review.

Quality Inspection and Functional Validation

Depending on the approved specification, inspection may include:

• Material verification

• Thread gauging

• Flange diameter measurement

• Flange thickness inspection

• Barrel diameter measurement

• Barrel height inspection

• Mounting-hole diameter inspection

• Mounting-hole position verification

• Surface finish inspection

• Dimensional tolerance verification

• Functional mating-thread checks

• Assembly fit verification

Where required, customer-specific testing may include pull-out, push-out, rotational resistance or other mechanical performance evaluations.

Acceptance criteria must be agreed for the actual assembly.

Relevant Engineering Standards

These screw-mount nuts are typically specified by their individual engineering drawings rather than a single universal dimensional standard.

The following standards may be relevant to particular design features.

These references do not establish a universal dimensional specification for the complete three-hole mounting nut.

Finished-product conformity must be verified against the applicable drawing and customer requirements.

Frequently Asked Questions

What are screw-mount nuts?

Screw-mount nuts are internally threaded components with mounting bases that can be mechanically attached to a supporting surface.

What is the American name for a three-hole round-base threaded nut?

Screw-Mount Nuts is an established American industrial product name. Three-Hole Screw-Mount Nuts is a more descriptive term for this configuration.

How are three-hole screw-mount nuts installed?

They are typically attached through the mounting holes using suitable screws or rivets.

Can the threaded barrel pass through a hole?

Yes, when the supporting component and mounting arrangement are designed for that installation orientation.

Can the barrel face outward?

Yes. The flange can be secured with the barrel projecting outward when the assembly permits it.

What is the purpose of the threaded barrel?

It provides a female threaded connection and determines the available thread engagement length.

Are screw-mount nuts suitable for thin sheet metal?

They may be suitable when the mounting screws or rivets and supporting material are properly designed for the required load.

Are these the same as rivet nuts?

No. Conventional rivet nuts and three-hole screw-mount nuts use different installation methods.

Are these the same as weld nuts?

No. Welding capability requires a specific weld-compatible design and approved welding process.

Can they be used in furniture manufacturing?

Yes. They can be evaluated for suitable furniture frame, leg, support and adjustment assemblies.

What metric sizes are identified?

M6, M8, M10 and M12.

What inch sizes are identified?

1/4-20, 5/16-18, 3/8-16 and 1/2-13 UNC.

Are M6 and 1/4-20 interchangeable?

No. They have different thread dimensions and pitches.

Can stainless steel screw-mount nuts be manufactured?

Stainless steel is an identified material option. The exact grade and production requirements must be confirmed.

Can the flange diameter and mounting holes be customized?

Yes. Juxin Fasteners can evaluate custom designs according to customer drawings and manufacturing feasibility.

Can Juxin Fasteners manufacture screw-mount nuts from drawings?

Yes. We support OEM/ODM made-to-drawing manufacturing and industrial batch production.

Request a Quote — Three-Hole Screw-Mount Nuts

Juxin Fasteners supports global furniture manufacturers, industrial OEMs, Tier-1 and Tier-2 suppliers requiring three-hole screw-mount nuts, threaded mounting components and custom fasteners.

Our manufacturing capabilities include cold heading, cold forming, CNC machining and product-specific secondary operations selected according to engineering requirements.

For an accurate manufacturing quotation, please provide:

• 2D engineering drawing or 3D CAD model

• Customer part number

• Intended application

• Metric or UNC/UNF thread designation

• Thread pitch and tolerance

• Flange outside diameter

• Flange thickness

• Barrel outside diameter

• Barrel height

• Mounting-hole diameter

• Mounting-hole bolt circle and spacing

• Material grade

• Surface finish requirements

• Installation orientation

• Supporting material and thickness

• Mechanical performance requirements

• Inspection and acceptance criteria

• Initial order quantity

• Estimated annual demand

• Packaging requirements

• Target delivery schedule

Our engineering team can review your design for manufacturing feasibility, custom production and long-term OEM supply.

Juxin Fasteners

Industrial Fastener Manufacturer | Three-Hole Screw-Mount Nuts | Custom Threaded Mounting Components

Website: https://www.juxinfasteners.com/

Email: info@juxinfasteners.com

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.