Industrial Automation Threaded Inserts for Plastic: PLC, Sensor and Control Equipment Design Guide

Industrial automation equipment combines electronics, sensors, communication modules and mechanical components inside increasingly compact enclosures.

PLCs, industrial switches, controllers, sensors, gateways, network equipment and machine-control systems frequently use engineered plastic housings because polymers can support:

• Low component weight

• Complex molded geometry

• Electrical isolation strategies

• Efficient high-volume manufacturing

• Integration of mounting features

• Compact enclosure design

But plastic housings still require durable threaded connections for covers, PCBs, brackets, connectors, electronic modules and serviceable components.

Threaded inserts provide a metal internal thread inside the engineered plastic component.

However, selecting an insert for industrial automation equipment involves much more than choosing the correct thread.

A reliable engineering path is:

Equipment Function → Polymer → Boss Geometry → Insert Geometry → Installation Process → Mating Screw → Load & Vibration

 → Temperature & Environment → Electrical Requirements → Validation → Supplier Qualification

The central principle is:

Strong Insert ≠ Reliable Automation Equipment Joint.

JUXIN FASTENERS supplies threaded inserts for engineered plastic components, including heat-set inserts, ultrasonic insert solutions, 

tapered threaded inserts, stainless steel inserts and drawing-based custom fastening components for industrial automation, electronics and communication equipment.

Direct Answer: How Should Engineers Select Threaded Inserts for Industrial Automation Equipment?

Start with the housing and operating environment rather than the insert catalogue.

Define:

1. What equipment uses the insert?

2. What does the threaded joint secure?

3. What polymer and exact grade are used?

4. Is the polymer reinforced?

5. What boss geometry is available?

6. What screw and thread are required?

7. What pull-out resistance is required?

8. What torque resistance is required?

9. Will the equipment experience vibration?

10. What operating temperature range applies?

11. Are humidity, condensation, dust or chemicals present?

12. Will the enclosure be repeatedly opened for maintenance?

13. Which installation process will be used?

14. Is installation automated?

15. Does the insert have any electrical, grounding or shielding function?

16. What documentation and traceability are required?

Then select:

Insert Material + Retention Geometry + Hole Geometry + Installation Method + Surface Condition

This is more reliable than:

Thread Size → Material → Unit Price

Why Threaded Inserts Are Used in Industrial Automation

Automation equipment may require repeated access for:

• Commissioning

• Maintenance

• Calibration

• PCB replacement

• Connector replacement

• Troubleshooting

• Product upgrades

• Field servicing

Direct plastic threads may be appropriate for some components.

But repeated screw installation can contribute to:

• Thread wear

• Thread stripping

• Local plastic deformation

• Reduced serviceability

A metal threaded insert provides a reusable internal thread.

But:

Metal Thread ≠ Metal Joint.

The insert still transfers load into the surrounding polymer.

If the plastic boss cracks, creeps or loses retention, the strength of the metal internal thread cannot prevent joint failure.

The Real Load Path in an Industrial Insert Joint

The mechanical load path is:

Mating Screw → Internal Insert Thread → Insert Body → External Retention Geometry → Polymer → Boss → Housing

Possible failure modes include:

• Internal thread damage

• Insert pull-out

• Insert rotation

• Plastic boss cracking

• Boss splitting

• Local deformation

• Polymer creep

• Loss of clamp load

• Screw loosening

Therefore:

Insert Strength ≠ Installed Joint Strength.

The insert, plastic component and screw must be treated as one mechanical system.

Where Threaded Inserts Are Used in Automation Equipment

Potential applications include:

PLC Housings

Threaded inserts may support:

• Housing covers

• Internal brackets

• PCB assemblies

• Electronic modules

• Connector supports

• Mounting features

Industrial Sensors

Compact sensor housings may require threaded mounting points for:

• Covers

• Internal electronics

• Mounting brackets

• Protective components

• Connector-related structures

Industrial Controllers

Potential applications include:

• Plastic enclosures

• Service covers

• Display assemblies

• Internal electronic modules

• Mounting brackets

Industrial Switches and Network Equipment

Threaded inserts can be evaluated for:

• Electronic housings

• Communication modules

• Internal brackets

• Serviceable covers

• Mounting components

Industrial IoT Equipment

Gateways and industrial IoT devices can combine:

• Sensors

• PCBs

• Wireless modules

• Connectors

• Displays

• Plastic enclosures

Threaded inserts can provide compact reusable mounting locations where appropriate.

Electrical and Control Equipment

Potential applications include selected:

• Control modules

• Electrical enclosures

• Terminal-related housings

• Electronic subassemblies

• Machine-control equipment

But:

Industrial Equipment Application ≠ One Universal Insert Specification.

Each joint should be evaluated according to its actual function.

PLC Housing Fastening Requires More Than a Durable Thread

A PLC housing may contain:

• PCBs

• I/O modules

• Communication modules

• Connectors

• Power components

• Covers

• Mounting hardware

Some joints are opened only during manufacturing.

Others may be accessed repeatedly in service.

This difference affects insert selection.

A serviceable enclosure may prioritize:

• Repeated thread durability

• Controlled tightening

• Insert retention

• Dimensional stability

An internal permanent assembly may have different priorities.

Therefore:

Same PLC Housing ≠ Same Requirement for Every Fastener.

Industrial Sensor Housings

Sensors can create particularly demanding insert-design conditions because housings may be compact.

Available boss geometry can be limited by:

• PCB location

• Sensor element position

• Connector geometry

• Sealing features

• Housing wall thickness

This creates an important rule:

Small Insert ≠ Simple Joint.

A miniature insert in a thin plastic boss can be more sensitive to dimensional variation than a larger insert in a robust housing.

Polymer Selection Comes Before Insert Selection

Industrial electronics can use engineering plastics such as:

• PA6

• PA66

• Reinforced nylon

• PC

• PC/ABS

• POM/acetal

• PEEK

• Other application-specific thermoplastics

The polymer family alone does not fully define insert performance.

Relevant variables can include:

• Exact grade

• Reinforcement

• Filler

• Moisture

• Temperature

• Molding condition

• Chemical exposure

• Aging

Therefore:

Same Polymer Name ≠ Same Finished Performance.

The insert should be validated in the actual production material where functional performance matters.

Reinforced Plastics Change Installation Behavior

Glass-filled and other reinforced polymers can behave differently from unfilled grades.

Reinforcement can change:

• Stiffness

• Installation force

• Polymer flow

• Boss cracking behavior

• Pull-out resistance

• Torque resistance

Therefore:

PA66 ≠ PA66-GF Application Behavior.

An insert validated in unfilled PA66 should not automatically be transferred to glass-filled PA66.

Moisture and Nylon Components

PA6 and PA66 can absorb moisture.

Moisture can influence:

• Dimensions

• Stiffness

• Mechanical behavior

• Long-term insert retention

Therefore:

Dry Nylon Test ≠ Conditioned Nylon Performance.

Where moisture sensitivity is relevant, validation should reflect expected service conditions.

Boss Geometry Is Part of the Fastening System

The plastic boss is not simply a holder for the insert.

It transfers load into the housing.

Important boss variables include:

• Outside diameter

• Receiving-hole diameter

• Hole depth

• Wall thickness

• Distance from edges

• Nearby ribs

• Molded geometry

• Material-flow condition

Therefore:

Correct Insert + Incorrect Boss = Unreliable Joint.

The insert supplier and enclosure designer should consider the interface together.

Larger Boss Does Not Automatically Mean Better Joint

Adding more plastic around the insert may improve some load conditions.

But excessive local material can also influence:

• Molding

• Cooling

• Sink

• Warpage

• Packaging space

The correct boss design should balance fastening performance with molding and enclosure architecture.

Receiving-Hole Geometry Controls Installation

If the receiving hole is too small:

• Installation force may increase

• Boss stress may rise

• Cracking may occur

• Installation consistency may decline

If the hole is too large:

• Pull-out resistance may decrease

• Torque resistance may decrease

• Polymer engagement may become insufficient

Therefore:

Insert OD Alone ≠ Correct Hole Specification.

The hole should be specified for the actual insert, polymer and installation method.

Heat-Set Inserts for Automation Equipment

Heat-set inserts use controlled heat to soften suitable thermoplastic around the insert.

During installation, the polymer flows around external retention features.

After cooling, the plastic forms mechanical engagement around the insert.

Heat-set installation can provide:

• Durable internal threads

• Controlled installation

• Good production repeatability

• Automation potential

when the insert, boss and process are correctly matched.

Heat-Set Installation Is a Process, Not Just a Component Choice

Important variables can include:

• Tool temperature

• Insert temperature

• Installation speed

• Installation depth

• Alignment

• Polymer condition

• Boss geometry

• Cooling

Therefore:

Hotter Installation ≠ Better Retention.

Excessive heat can damage the polymer.

Insufficient heat can create poor flow or excessive insertion force.

The goal is a stable process window.

Ultrasonic Threaded Inserts

Ultrasonic insertion uses localized mechanical energy to generate heat at the insert/polymer interface.

Potential benefits can include:

• Short installation cycles

• Localized heating

• Automation potential

However, performance depends on:

• Polymer

• Insert geometry

• Ultrasonic equipment

• Fixture

• Energy

• Pressure

• Installation depth

Therefore:

Ultrasonic Installation ≠ Heat-Set Installation With Different Equipment.

Each process requires separate validation.

Press-Fit Inserts

Press-fit inserts can be used in suitable plastic components without a thermal installation step.

However, mechanical insertion creates radial stress.

Excessive interference can cause:

• Boss cracking

• Local deformation

• Residual stress

• Installation instability

Insufficient interference can reduce retention.

Therefore:

More Interference ≠ Better Retention.

The hole, insert and boss should be matched to the actual polymer.

In-Mold Inserts

In-mold inserts are positioned before plastic injection.

The polymer is molded around the insert.

This can eliminate a separate post-molding installation operation.

But manufacturing must control:

• Insert position

• Orientation

• Mold retention

• Plastic flow

• Flash

• Thread protection

Therefore:

In-Mold Installation ≠ Automatic Performance Advantage.

The final assembly still requires functional validation.

Heat-Set vs. Ultrasonic vs. Press-Fit vs. In-Mold

The correct choice depends on:

Polymer + Boss + Insert + Production Process + Required Performance

Knurl Geometry Is a Functional Feature

External knurls and retention bands transfer load between the insert and polymer.

They may help resist:

• Axial pull-out

• Rotation

• Installation movement

Relevant characteristics can include:

• Knurl angle

• Knurl depth

• Pitch

• Direction

• Retention bands

• Taper

Therefore:

Same Thread + Same OD ≠ Same Insert Performance.

Visual similarity is not enough for engineering equivalence.

Pull-Out Resistance

Pull-out testing evaluates axial retention.

Performance depends on:

• Insert geometry

• Insert length

• Polymer

• Boss

• Hole

• Installation

• Temperature

• Conditioning

Therefore:

Catalogue Pull-Out Value ≠ Finished Housing Pull-Out Performance.

Test values should always be interpreted with their polymer, geometry and test conditions.

Torque-Out Resistance

Torque-out testing evaluates resistance to insert rotation in the plastic.

It is a different failure mode from pull-out.

Therefore:

Pull-Out ≠ Torque-Out.

A design can have good axial retention but insufficient anti-rotation performance.

Screw Tightening Torque Is Different Again

The mating screw applies torque through the internal thread.

The insert must remain stable, but the plastic and clamped components must also tolerate the resulting loads.

Therefore:

Screw Tightening Torque ≠ Insert Torque-Out Requirement.

Increasing tightening torque can cause:

• Insert rotation

• Insert pull-out

• Internal thread damage

• Plastic crushing

• Housing distortion

More Installation Torque ≠ Better Joint.

Torque Does Not Directly Define Clamp Load

For joints where clamp load matters:

Torque ≠ Preload.

Thread and bearing friction influence how tightening torque becomes preload.

Changes in:

• Screw coating

• Insert material

• Surface condition

• Lubrication

can change the result.

Therefore:

Same Torque + Different Friction ≠ Same Preload.

Vibration: Separate Insert Retention From Screw Loosening

Industrial automation equipment can experience vibration from:

• Motors

• Pumps

• Fans

• Machine frames

• Production equipment

• Mobile machinery

An insert may remain firmly retained while the mating screw loses preload.

Therefore:

Insert Torque-Out Resistance ≠ Screw Anti-Loosening Performance.

These are two different engineering mechanisms.

If screw loosening is the problem, increasing insert knurl aggressiveness may not solve it.

Locking Features Do Not Replace Joint Design

If vibration requires a locking strategy, engineers may evaluate suitable:

• Prevailing-torque hardware

• All-metal lock nuts where applicable

• Nylon insert lock nuts where temperature permits

• Other application-specific locking methods

But:

Locking Feature ≠ Correct Preload.

And:

Prevailing Torque ≠ Preload.

The correct strategy depends on the complete joint.

Temperature Cycling

Industrial electronics can operate in environments with repeated temperature changes.

Metal inserts and polymers generally have different thermal expansion behavior.

Temperature cycling can influence:

• Insert retention

• Boss stress

• Clamp load

• Polymer stiffness

Therefore:

Room-Temperature Performance ≠ Full Service Performance.

Validation should represent the actual operating environment where necessary.

Polymer Creep and Stress Relaxation

Plastic can deform gradually under sustained load.

This can reduce:

• Local contact pressure

• Clamp load

• Joint stiffness

Elevated temperature can make these effects more important.

Therefore:

Initial Assembly Condition ≠ Long-Term Joint Condition.

The insert may remain in place while the clamped joint changes over time.

Humidity and Condensation

Industrial control equipment can be installed in:

• Factories

• Warehouses

• Outdoor cabinets

• Process equipment

• HVAC environments

Depending on enclosure design, inserts may encounter humidity or condensation.

The complete material combination should be evaluated.

Corrosion-Resistant Insert ≠ Corrosion-Resistant Assembly.

Industrial Chemical Exposure

Potential exposure can include:

• Oils

• Coolants

• Cleaning chemicals

• Process fluids

• Industrial contaminants

The polymer can be affected even when the metal insert remains intact.

Therefore:

Chemically Resistant Insert ≠ Chemically Resistant Plastic Joint.

The insert, screw and polymer should be evaluated as a system.

Brass Threaded Inserts

Brass is commonly used for threaded inserts because it can provide:

• Good machinability

• Accurate internal threads

• Useful corrosion behavior

• Good thermal conductivity for heat installation

However:

Brass Insert ≠ Universal Industrial Insert.

The correct material depends on the environment and application.

Stainless Steel Threaded Inserts

Stainless steel inserts can be evaluated where the application requires different:

• Mechanical properties

• Corrosion behavior

• Material compatibility

JUXIN FASTENERS supports drawing-based stainless steel threaded insert projects, including tapered heat-set insert configurations.

But:

Stainless Steel ≠ Corrosion-Proof.

And:

316 Stainless ≠ Automatically Better for Every Industrial Joint.

The actual environment, mating material and assembly should determine material selection.

Nickel-Plated Inserts

Nickel plating can be specified for selected industrial insert applications.

However:

Nickel-Plated ≠ Complete Corrosion Specification.

A useful specification should identify:

• Base material

• Plating requirement

• Thickness where required

• Functional dimensions

• Environmental requirement

• Customer acceptance criteria

A coating can also change dimensions and surface behavior.

Therefore:

Coating Change Can Be an Engineering Change.

Salt Spray Data and Real Industrial Service

Where corrosion testing is specified:

Salt Spray Hours ≠ Field Service Life.

Accelerated corrosion testing can support comparative or specification-based evaluation, but it does not directly predict years of service in every industrial environment.

The actual exposure should remain part of material selection.

Aluminum Inserts

Aluminum can be evaluated where low mass or other application-specific properties are important.

But engineers should consider:

• Thread strength

• Wear

• Mating screw

• Galvanic interaction

• Corrosion

• Repeated service

Therefore:

Lower Density ≠ Better Industrial Insert.

Galvanic Corrosion

Industrial assemblies can combine:

• Brass inserts

• Stainless inserts

• Aluminum housings

• Steel screws

• Moisture

Where dissimilar metals are electrically connected in a conductive environment, galvanic interaction may need evaluation.

Therefore:

Corrosion-Resistant Insert ≠ Corrosion-Resistant Material Pair.

Electrical Safety: Mechanical Fastening Is Not Electrical Qualification

Automation equipment can contain:

• Power electronics

• PCBs

• Terminal systems

• Communication electronics

• Grounding systems

A metal insert is electrically conductive.

But:

Conductive Insert ≠ Qualified Electrical Connection.

And:

Mechanical Fastening ≠ Electrical Safety.

If the insert participates in grounding, bonding or current-carrying functions, the electrical interface requires separate engineering validation.

Metal Insert in Plastic Does Not Automatically Defeat Insulation

The opposite assumption is also too simplistic.

Whether a metal insert affects electrical isolation depends on:

• Location

• Geometry

• Mating screw

• Adjacent conductors

• Creepage

• Clearance

• Equipment architecture

Therefore:

Metal Insert in Plastic ≠ Automatic Electrical Failure.

Electrical design should be evaluated at system level.

PCB Mounting and Standoffs

Automation equipment frequently requires PCB support.

JUXIN FASTENERS supplies fastening products including:

• PCB supports

• PCB standoffs

• Nylon spacers

• Nylon screws

• Nylon nuts

• Nylon washers

• Snap rivets

• Push rivets

These can complement metal threaded inserts in electronics assemblies.

But:

Metal Standoff ≠ Electrical Insulator.

And:

Plastic Fastener ≠ System Electrical Compliance.

Material selection must follow the actual electrical and mechanical requirements.

EMI and EMC Require Separate Engineering

Industrial communication equipment may operate in demanding electromagnetic environments.

But:

Metal Fastener ≠ Automatic EMI Shielding.

And:

Plastic Fastener ≠ RF Isolation.

EMI/EMC performance depends on enclosure design, conductive paths, shielding, grounding and system architecture.

The threaded insert should not be assigned electrical performance that has not been validated.

Enclosure Sealing

Industrial sensors and control equipment may require sealed housings.

But:

Threaded Insert ≠ Waterproof Joint.

Potential leak paths can exist around:

• Insert/plastic interface

• Screw

• Cover

• Gasket

• Housing

And:

Sealed Fastener ≠ System IP Qualification.

The complete enclosure must meet the required ingress-protection performance.

Automated Insert Installation

Industrial automation manufacturers often use automated assembly themselves.

For automated insert installation, important characteristics can include:

• Outside diameter

• Length

• Knurl consistency

• Feeding orientation

• Gripping geometry

• Installation depth

• Position

• Thread dimensions

However:

Dimensional Compliance ≠ Stable Automated Installation.

Part geometry, polymer variation, feeding and process settings all influence production stability.

Feeding and Orientation

A threaded insert that performs well mechanically can still create manufacturing problems if it:

• Feeds inconsistently

• Flips orientation

• Jams

• Is difficult to grip

• Has unstable presentation

Therefore:

Good Mechanical Performance ≠ Good Automation Compatibility.

For high-volume equipment, feeding should be considered during component development.

Process Monitoring

Automated installation systems may monitor variables such as:

• Insertion depth

• Installation force

• Temperature

• Time

• Equipment-specific process parameters

The exact monitoring strategy depends on the process.

A useful principle is:

Process Data ≠ Product Acceptance Unless Acceptance Criteria Are Defined.

Collecting data alone does not guarantee a good insert joint.

Common Failure Modes in Automation Equipment

Failure analysis should identify the actual mechanism before changing the insert.

Second-Source Qualification for Industrial Threaded Inserts

Industrial OEMs may qualify a second source for:

• Supply continuity

• Capacity

• Regional sourcing

• Cost management

• Risk reduction

But alternative inserts should not be approved based only on:

• Thread size

• Length

• Outside diameter

• Material name

• Appearance

Compare:

Drawing + Revision + Material + Thread + Insert Geometry + Knurl Geometry + Taper + Surface Treatment + Hole Requirement

 + Polymer + Boss Geometry + Installation Process + Pull-Out + Torque-Out + Environmental Behavior + Automation + Packaging + Documentation + Change Control

The central principle is:

Same Dimensions ≠ Functional Equivalence.

Same Appearance Does Not Mean Same Retention

Two inserts can look similar but have different:

• Knurl depth

• Knurl angle

• Pitch

• Direction

• Taper

• Retention bands

These differences can change:

• Polymer flow

• Pull-out resistance

• Torque resistance

• Installation force

• Automated feeding

Therefore:

Visual Similarity ≠ Functional Equivalence.

Material Substitution Requires Review

Changing:

• Brass to stainless steel

• One stainless grade to another

• Plated to unplated material

• One plating system to another

can affect:

• Installation

• Corrosion

• Galvanic behavior

• Dimensions

• Electrical behavior

• Cost

Therefore:

Same Geometry + Different Material ≠ Automatic Functional Equivalence.

Supplier Qualification for Automation OEMs

Procurement and supplier-development teams should evaluate more than unit price.

Useful questions include:

• Can the supplier control the retention geometry?

• How are threads inspected?

• How is material controlled?

• How are coatings controlled?

• Can pull-out and torque testing be defined?

• How is lot identification managed?

• Can packaging support automated feeding?

• How are drawing revisions controlled?

• How are manufacturing changes controlled?

• Can the supplier support metric and inch designs?

• Can custom geometry be developed from drawings?

• Can supply volume remain stable?

The sourcing question is not simply:

Can This Supplier Make the Insert?

It is:

Can This Supplier Reproduce the Functional Interface Reliably Across Production Lots?

Change Control Matters

A seemingly small insert change can affect:

• Installation equipment

• Feeding

• Hole compatibility

• Pull-out

• Torque resistance

• Enclosure assembly

Therefore:

Small Geometry Change ≠ Small Production Change.

For established automated production, supplier process and product changes should be controlled according to the customer requirement.

Total Installed Cost

Procurement should evaluate:

Total Installed Cost = Insert Price + Installation + Tooling + Cycle Time + Inspection + Scrap + Rework + Downtime + Packaging + Logistics + Warranty Risk + Supply Risk

A low-priced insert can become expensive if it causes:

• Installation rejects

• Boss cracking

• Feeder jams

• Rework

• Line interruptions

• Field-service failures

Therefore:

Lowest Insert Price ≠ Lowest Installed Cost.

Supply Continuity

Industrial automation equipment can remain in production for long product cycles.

Component changes may require:

• Engineering review

• Revalidation

• Tool adjustment

• Production-line changes

This makes continuity important.

Supplier-development teams should consider:

• Capacity

• Raw-material availability

• Lead time

• Production consistency

• Packaging consistency

• Change notification

• Forecast management

Low Component Cost ≠ Low Supply Risk.

Design Engineer Search Intent

Engineers may search:

• Threaded inserts for PLC housing

• Threaded inserts for industrial automation

• Heat-set insert for sensor housing

• Threaded insert for industrial electronics

• Brass inserts for plastic enclosures

• Stainless steel inserts for plastic

• Threaded inserts for PA66

• Heat-set inserts for glass-filled nylon

• Industrial insert pull-out strength

• How to prevent insert rotation in plastic

• Threaded inserts for control equipment

• Inserts for industrial communication equipment

• Threaded insert boss design

• Heat-set vs ultrasonic insert

A useful engineering page should answer these selection and failure questions rather than simply display a product list.

Procurement and Supplier-Development Search Intent

Commercial searches may include:

• Industrial threaded insert manufacturer

• Automation equipment insert supplier

• PLC threaded insert supplier

• Sensor housing insert manufacturer

• Heat-set insert manufacturer

• Stainless steel threaded insert supplier

• Brass insert manufacturer

• Custom threaded inserts for plastic

• Industrial electronics fastener supplier

• Second-source threaded insert manufacturer

• OEM automation fastener supplier

Procurement needs to evaluate:

Manufacturing Capability + Functional Consistency + Documentation + Supply Continuity

rather than piece price alone.

JUXIN FASTENERS Solutions for Industrial Automation

JUXIN FASTENERS supplies fastening components for engineered plastic, sheet-metal and electronic assemblies.

Relevant product families include:

Heat-Set Threaded Inserts

Threaded inserts for controlled thermal installation into suitable thermoplastics.

Ultrasonic Insert Solutions

Insert geometries can be evaluated for compatible ultrasonic installation processes.

Tapered Threaded Inserts

Tapered configurations can support controlled installation into suitable plastic bosses.

Stainless Steel Threaded Inserts

Drawing-based stainless steel insert projects can be evaluated according to material, thread and geometry.

JUXIN FASTENERS has experience with 303 stainless steel tapered heat-set inserts for drawing-based OEM applications.

Custom Threaded Inserts

Projects can be evaluated according to:

• Metric or inch thread

• Length

• Outside diameter

• Taper

• Knurl geometry

• Material

• Surface finish

• Installation method

• Customer drawing

Self-Clinching Fasteners

For sheet-metal control cabinets and equipment assemblies, JUXIN FASTENERS also supplies:

• Self-clinching nuts

• Self-clinching studs

• Self-clinching standoffs

• Miniature self-clinching hardware

Rivet Nuts

For one-sided installation in sheet-metal enclosures, available product families include:

• Full-hex rivet nuts

• Half-hex rivet nuts

• Round-body rivet nuts

• Knurled and ribbed rivet nuts

• Countersunk rivet nuts

• Open-end and closed-end rivet nuts

• Floating rivet nuts

Weld Nuts and Weld Studs

For suitable metal equipment structures, JUXIN FASTENERS supplies:

• DIN 929 hex weld nuts

• DIN 928 square weld nuts

• Square weld nuts

• Flange projection weld nuts

• Round piloted projection weld nuts

• Floating cage weld nuts

• Weld studs

• Weld pins

Plastic and Nylon Hardware

For electronics assemblies, JUXIN FASTENERS supplies:

• Nylon screws

• Nylon nuts

• Nylon washers

• Nylon spacers

• PCB supports

• PCB standoffs

• Card guides

• Snap rivets

• Push rivets

• Screw grommets

This wider product portfolio allows OEM engineers to evaluate fastening according to the actual substrate:

Plastic Housing → Threaded Insert

Sheet-Metal Enclosure → Self-Clinching Fastener or Rivet Nut

Weldable Metal Structure → Weld Nut or Weld Stud

PCB/Electronics Assembly → Standoff, Spacer or Nylon Hardware

The fastening method should follow the structure rather than forcing one product family into every application.

Engineer FAQ

Why are threaded inserts used in industrial automation equipment?

They provide durable reusable internal threads in suitable plastic housings used for PLCs, sensors, controllers, switches and electronic modules.

Can heat-set inserts be used in PLC housings?

Yes, where the housing uses a compatible thermoplastic and the insert, boss and installation process are correctly designed.

Which insert is best for a sensor housing?

There is no universal best insert. Selection depends on polymer, available boss size, thread, loads, environment and installation process.

Can threaded inserts withstand industrial vibration?

The insert can provide mechanical retention, but insert retention and screw self-loosening are different mechanisms. Both should be evaluated.

What is the difference between pull-out and torque-out?

Pull-out measures axial extraction resistance. Torque-out measures resistance to rotation in the plastic.

Are nickel-plated inserts corrosion-resistant?

Nickel plating can be useful for selected environments, but the complete plating specification and service conditions must be defined.

Are stainless steel inserts better for industrial environments?

Not automatically. The correct material depends on corrosion, chemicals, mating materials, installation and cost.

Can threaded inserts be used in sealed sensor housings?

Yes where mechanically appropriate, but the insert itself does not establish enclosure sealing or an IP rating.

Can a metal insert provide grounding?

A metal insert is conductive, but conductivity alone does not establish a qualified grounding or bonding connection.

Can threaded inserts be installed automatically?

Heat-set, ultrasonic and other suitable installation processes can be automated, but insert geometry, feeding,

 boss dimensions and process control must support stable automation.

Procurement FAQ

What should be included in an industrial threaded insert RFQ?

Provide the drawing, application, polymer, boss geometry, thread, mating screw, material, installation process, 

functional requirements, environment, automation requirements, packaging and annual volume.

Can JUXIN FASTENERS manufacture custom threaded inserts?

Drawing-based projects can be evaluated according to thread, material, geometry, knurl, tolerance and installation requirements.

Can JUXIN supply metric and inch threaded inserts?

Metric and inch-thread drawing-based projects can be evaluated according to the required specification.

Can JUXIN supply stainless steel heat-set inserts?

JUXIN FASTENERS can evaluate drawing-based stainless steel heat-set inserts and has experience with 303 stainless steel tapered heat-set insert projects.

Can an existing insert be second-sourced from a sample?

A sample can support evaluation, but a controlled drawing, material specification, polymer, installation process and functional requirements provide a stronger qualification basis.

Why does the plastic material need to be included in the RFQ?

Because insert retention and installation behavior depend directly on the surrounding polymer.

Should packaging be specified?

Yes, especially where parts are automatically fed or where packaging changes can affect handling and production efficiency.

Should the supplier be notified before changing insert geometry or manufacturing process?

For controlled OEM components, change-control requirements should be defined during supplier qualification.

RFQ Checklist for Industrial Automation Threaded Inserts

For an efficient technical and commercial review, provide:

• 2D drawing

• 3D model where available

• Part number

• Drawing revision

• Equipment type

• Component application

• Joint function

• Insert type

• Internal thread

• Metric or inch thread system

• Mating screw

• Insert material

• Exact material grade where required

• Surface treatment

• Overall length

• Outside diameter

• Taper geometry

• Knurl geometry

• Flange/shoulder geometry where applicable

• Polymer type

• Exact polymer grade where available

• Reinforcement/filler

• Boss outside diameter

• Receiving-hole diameter

• Hole depth

• Boss wall thickness

• Installation method

• Heat-set requirements where defined

• Ultrasonic requirements where defined

• Press-fit requirements where defined

• In-mold requirements where applicable

• Installation depth

• Installation equipment

• Automation requirements

• Feeding method

• Required pull-out performance

• Required torque-out performance

• Screw tightening torque

• Target preload where applicable

• Repeated assembly requirement

• Vibration requirement

• Operating temperature

• Temperature cycling

• Humidity

• Condensation exposure

• Chemical exposure

• Corrosion requirement

• Electrical requirement where applicable

• Grounding/bonding function where applicable

• Sealing/IP requirement where applicable

• Dimensional tolerances

• Thread inspection requirements

• Functional testing

• Material documentation

• Surface-treatment documentation

• Lot identification

• Traceability requirements

• First-article requirements

• Customer-specific documentation

• Change-control requirements

• Packaging specification

• Annual volume

• Forecast

• Production schedule

• Delivery requirements

• Existing approved sample for second-source projects

For second-source development, also provide the approved baseline drawing and functional acceptance criteria where available.

This enables the project to be evaluated as:

Insert + Polymer + Boss + Installation + Screw + Environment + Automation + Documentation + Supply Risk

rather than:

Thread Size + Material + Price

Related JUXIN FASTENERS Engineering Resources

This article should connect internally with existing JUXIN FASTENERS resources covering:

• Threaded Inserts for Plastic

• Heat-Set Threaded Inserts

• Ultrasonic Threaded Inserts

• Stainless Steel Threaded Inserts

• Industrial Automation Fastening Solutions

• Communication Equipment Fastening Solutions

• Electrical Equipment Fastening Solutions

• PCB Supports and Standoffs

• Plastic and Nylon Fasteners

• Self-Clinching Fasteners

• Rivet Nuts for Sheet-Metal Enclosures

• Weld Nuts and Weld Studs

• ISO Metric Thread Tolerances

• Fastener Surface Finish Selection

• Supplier Qualification and Second-Source Development

Use the existing indexed JUXIN FASTENERS URL when implementing each internal link.

The intended internal-link architecture is:

Industrial Automation → Equipment System → Housing Material → Fastener Type → Threaded Insert → Installation

 → Environment → Failure Mode → Supplier Qualification → RFQ

This page should remain focused on industrial automation threaded inserts for plastic housings, 

while related pages can address sheet-metal control cabinets, PCB hardware, electrical equipment and broader industrial fastening solutions.

Final Engineering Rule: Select the Insert as Part of the Equipment System

A threaded insert should not be selected as an isolated catalogue component.

The real system is:

Mating Screw + Insert + Retention Geometry + Polymer + Boss + Installation Process + Equipment Environment + Production Process

Remember:

Strong Insert ≠ Reliable Automation Equipment Joint.

Metal Thread ≠ Metal Joint.

Insert Strength ≠ Installed Joint Strength.

Same PLC Housing ≠ Same Requirement for Every Fastener.

Small Insert ≠ Simple Joint.

Same Polymer Name ≠ Same Finished Performance.

PA66 ≠ PA66-GF Application Behavior.

Dry Nylon Test ≠ Conditioned Nylon Performance.

Correct Insert + Incorrect Boss = Unreliable Joint.

Insert OD Alone ≠ Correct Hole Specification.

Hotter Installation ≠ Better Retention.

More Interference ≠ Better Retention.

Same Thread + Same OD ≠ Same Insert Performance.

Pull-Out ≠ Torque-Out.

Screw Tightening Torque ≠ Insert Torque-Out Requirement.

More Installation Torque ≠ Better Joint.

Torque ≠ Preload.

Same Torque + Different Friction ≠ Same Preload.

Insert Torque-Out Resistance ≠ Screw Anti-Loosening Performance.

Locking Feature ≠ Correct Preload.

Prevailing Torque ≠ Preload.

Room-Temperature Performance ≠ Full Service Performance.

Initial Assembly Condition ≠ Long-Term Joint Condition.

Corrosion-Resistant Insert ≠ Corrosion-Resistant Assembly.

Nickel-Plated ≠ Complete Corrosion Specification.

Salt Spray Hours ≠ Field Service Life.

Conductive Insert ≠ Qualified Electrical Connection.

Mechanical Fastening ≠ Electrical Safety.

Metal Fastener ≠ Automatic EMI Shielding.

Threaded Insert ≠ Waterproof Joint.

Sealed Fastener ≠ System IP Qualification.

Dimensional Compliance ≠ Stable Automated Installation.

Good Mechanical Performance ≠ Good Automation Compatibility.

Same Dimensions ≠ Functional Equivalence.

Visual Similarity ≠ Functional Equivalence.

Small Geometry Change ≠ Small Production Change.

Lowest Insert Price ≠ Lowest Installed Cost.

For design engineers, this framework connects threaded-insert selection with polymer behavior, boss geometry, vibration, temperature, corrosion and electrical-system boundaries.

For manufacturing engineers, it connects insert design with installation equipment, automation, feeding and process control.

For procurement, supplier-development and supply-chain teams, it provides a qualification path based on functional consistency,

 documentation, change control and supply continuity rather than dimensions and unit price alone.

For industrial automation OEMs, the commercial development path should be:

Application → Drawing → Polymer → Boss → Insert → Installation → Environmental Validation → Production Validation → Supplier Qualification → RFQ

JUXIN FASTENERS supports industrial automation, communication equipment and electronics projects with heat-set inserts,

 ultrasonic insert solutions, tapered threaded inserts, stainless steel threaded inserts, self-clinching fasteners, rivet nuts, weld nuts, 

weld studs, plastic and nylon fasteners, PCB hardware and drawing-based custom fastening components.

For a new project or second-source evaluation, send the controlled drawing together with the polymer, boss geometry, mating screw,

 installation process, functional requirements, operating environment, automation requirements, packaging and annual volume for technical and commercial review.

JUXIN FASTENERS

Email: info@juxinfasteners.com

Website: www.juxinfasteners.com