Precision Knurled Brass Threaded Inserts & After-Molding Installation Solutions

Executive Summary & Industrial Engineering Context

In high-volume power tool production, automotive electronics, industrial electrical equipment, consumer electronics, 

and precision enclosure manufacturing, securing reliable threaded metal fasteners into thermoplastic components poses significant structural and manufacturing challenges.

Directly tapping a plastic component may provide an economical solution for low-load applications,

 but the polymer thread can be vulnerable to thread stripping, creep, stress relaxation, repeated assembly damage, and loss of clamping performance.

Brass threaded inserts for plastic provide a more durable metallic internal thread while preserving the weight and manufacturing flexibility of the surrounding polymer component.

For many injection-molded plastic parts, post-molding installation can provide an alternative to molded-in inserts.

Instead of placing the metal insert inside the injection mold before polymer injection, 

the plastic housing is molded first and the knurled brass insert is installed afterward using a controlled thermal, ultrasonic, press-fit, or other application-specific process.

Post-mold insertion can provide several manufacturing advantages:

• Simplified injection-molding tooling

• Reduced insert-handling complexity inside the mold

• Flexible assembly-line configuration

• Easier inspection and process adjustment

• Separation of molding and insert-installation operations

• Potentially shorter molding cycles depending on the component and production process

However, post-molding installation is not automatically better than molded-in insertion for every application. 

The correct solution depends on production volume, component geometry, polymer behavior, insert design, required retention force, and total manufacturing cost.

This engineering guide evaluates:

1. Mechanical Feature Optimization: Stepped outer diameters, diagonal knurling, diamond knurl bands, grooves, chamfers, and other external retention features used in knurled brass threaded inserts.

2. Manufacturing Efficiency: After-molding insertion workflows that separate injection molding from metal-insert installation and can simplify tooling and production control.

3. Installation Technology: Heat-set, thermal, ultrasonic, press-in, and other post-molding insertion methods for thermoplastic components.

4. Structural Design: The relationship between insert geometry, pilot-hole size, boss diameter, polymer type, installation force, pull-out strength, and rotational torque.

5. Material Selection: Brass grades and other metallic materials selected according to machinability, conductivity, corrosion behavior, strength, and installation requirements.

6. Procurement Specification: A practical RFQ framework for sourcing custom brass threaded inserts for plastic, including thread, length, material, external geometry, surface treatment, polymer, and performance requirements.

1. Global Standards & Metallurgical Specifications

High-performance knurled brass inserts require a material that can be manufactured accurately while providing suitable mechanical and thermal behavior during installation.

Brass is widely used for plastic threaded inserts because it combines:

• Excellent machinability

• Good thermal conductivity

• Good electrical conductivity

• Useful corrosion resistance

• Suitable strength for many plastic-housing applications

• Good compatibility with heat-set and ultrasonic insertion processes

However, material standards such as ASTM B16 or EN 12164 describe particular brass material forms and compositions. They do not automatically constitute a complete product standard for a finished threaded insert.

For procurement, the finished insert drawing should therefore specify:

• Brass alloy

• Thread size

• Thread tolerance

• Outside diameter

• Length

• Knurl geometry

• Surface finish

• Dimensional tolerances

• Required mechanical performance

• Applicable inspection requirements

Brass Grade Selection for Threaded Inserts

For many brass threaded inserts for plastic, free-machining brass is attractive because the insert requires accurate internal threads and controlled external knurl geometry.

However, the best brass grade is not determined by machinability alone.

The engineering selection should consider:

• Thread strength

• Insert dimensions

• Knurl depth

• Installation temperature

• Ultrasonic response

• Electrical conductivity

• Corrosion requirements

• Regulatory requirements

• Customer material restrictions

• Production process

Where lead-free requirements apply, the exact alloy should be specified rather than simply describing the insert as “lead-free brass.”

This is particularly important for automotive electronics, medical devices, electrical equipment, and other applications with restricted-substance requirements.

2. Structural Features & Mechanical Engineering

The external profile of a post-mold knurled brass insert strongly influences its resistance to axial pull-out and rotational movement.

The external geometry creates mechanical engagement with the surrounding polymer.

Depending on the design, this may include:

• Straight knurling

• Diamond knurling

• Diagonal knurling

• Opposing knurl bands

• Annular grooves

• Undercut features

• Stepped outer diameters

• Chamfered pilot sections

• Head or flange features

JUXIN FASTENERS can develop custom external geometries according to the plastic material, installation method, available boss geometry, and required mechanical performance.

                  PRECISION KNURLED INSERT GEOMETRY

            +---------------------------------------+
            |  [Round Head Guide / Chamfer Ring]    |
            |       Leading Alignment Section       |
            +---------------------------------------+
            |  [Stepped Outer Diameter – Step 1]    |
            |      Progressive Polymer Entry        |
            +---------------------------------------+
            |  [Diagonal / Diamond Knurl Band 1]    |
            |      Rotational & Axial Retention     |
            +---------------------------------------+
            |  [Central Annular Relief / Groove]    |
            |      Polymer Flow / Retention Zone    |
            +---------------------------------------+
            |  [Diagonal / Diamond Knurl Band 2]    |
            |      Additional Retention Area        |
            +---------------------------------------+
            |  [Stepped Outer Diameter – Step 2]    |
            |      Controlled Polymer Displacement  |
            +---------------------------------------+

2.1 Opposing Diagonal Knurling & Rotational Resistance

External knurl geometry plays an important role in rotational torque resistance.

A knurled brass insert with properly designed diagonal or diamond features creates multiple mechanical contact areas between the brass insert and polymer.

Opposing or multi-directional knurl patterns can provide resistance against rotation in both directions.

This is particularly relevant where the mating screw is installed using:

• Electric screwdrivers

• Pneumatic screwdrivers

• Automatic screwdriving equipment

• Torque-controlled assembly tools

• Repeated service cycles

However, knurl geometry alone does not guarantee a specific torque value.

Actual rotational resistance depends on:

• Polymer strength

• Polymer temperature

• Insert diameter

• Knurl depth

• Knurl pitch

• Insert length

• Boss diameter

• Installation quality

• Screw torque

• Environmental aging

Therefore, the required rotational torque should be validated using the complete plastic-insert assembly.

2.2 Stepped Outer Diameter Architecture

A stepped outer diameter can help control how the insert enters the pilot hole and how the softened polymer moves around the external retention geometry.

During heat installation, the thermoplastic surrounding the insert becomes locally softened.

A properly designed external profile allows the polymer to flow around the knurl or groove structure without requiring excessive insertion force.

This can help reduce:

• Boss cracking

• Excessive radial expansion

• Localized polymer damage

• Insert misalignment

• Installation-force variation

However, the stepped profile should be designed together with the pilot-hole diameter and boss geometry.

A smaller or more aggressive insert profile is not automatically better because excessive displacement can increase hoop stress in brittle or highly reinforced plastics.

2.3 Diamond Knurling & External Retention

Diamond knurled brass inserts use intersecting diagonal features to create multiple mechanical engagement points.

This type of external profile can provide useful resistance against:

• Axial pull-out

• Clockwise rotation

• Counter-clockwise rotation

The final performance is determined by the actual knurl dimensions and the polymer's ability to resist deformation.

For glass-filled nylon inserts, for example, the designer should evaluate the interaction between the knurl geometry and the glass-fiber-reinforced polymer rather than assuming that a larger knurl automatically produces greater retention.

2.4 Round Head Guide / Pilot Lead

An unknurled leading section or chamfer can help guide the insert into the pilot hole.

This feature is particularly useful for automated heat-set insert installation and high-speed assembly.

The leading section can help:

• Center the insert

• Reduce initial insertion resistance

• Improve alignment

• Reduce the chance of angular installation

• Protect the first engagement section of the insert

For automated production, insert orientation, tooling alignment, insertion speed, and verticality should be controlled together.

3. Post-Mold Insertion Technologies vs. Molded-In Assemblies

Separating plastic molding from insert installation can provide manufacturing flexibility for certain high-volume plastic components.

Instead of:

Place metal insert in mold → Inject polymer → Cool → Eject

the production sequence becomes:

Injection molding → Fast ejection → Inspection → Post-mold insert installation

This allows the injection-molding process and metal-insert assembly process to be optimized independently.

+-----------------------------------------------------------------------------------------------+
|                                MANUFACTURING WORKFLOW COMPARISON                              |
+-----------------------------------------------------------------------------------------------+
|  MOLDED-IN METHOD:                                                                            |
|  Place metal part in mold --> Inject polymer --> Cool down --> Eject                          |
|  *Considerations: insert placement, mold tooling, insert movement, polymer flow,             |
|  differential thermal expansion, and potential tooling complexity.                            |
|                                                                                               |
|  AFTER-MOLDING METHOD:                                                                        |
|  Injection molding --> Eject plastic part --> Inspect --> Heat / Ultrasonic / Press Insert   |
|  *Potential benefits: simpler molding workflow, flexible assembly stations, easier           |
|  process adjustment, and separation of molding and insert-installation operations.            |
+-----------------------------------------------------------------------------------------------+

3.1 Comprehensive Value Matrix

The correct process should be selected based on total manufacturing economics and engineering performance rather than assuming that post-molding insertion is universally superior.

4. Engineering Design Guidelines & Information Gain

To achieve reliable pull-out strength and rotational torque resistance in thermoplastic components such as PA66, PBT, ABS, Polycarbonate, and reinforced engineering plastics, the insert and plastic boss must be designed as one mechanical system.

Important design parameters include:

• Insert outside diameter

• Insert length

• Knurl diameter

• Knurl depth

• Knurl pitch

• Pilot-hole diameter

• Boss outside diameter

• Boss wall thickness

• Polymer grade

• Glass-fiber content

• Installation temperature

• Installation force

• Insertion speed

• Screw tightening torque

• Operating temperature

• Environmental exposure

4.1 Heat-Staking & Ultrasonic Parameter Optimization

During thermal installation, the brass insert is heated and pressed into the thermoplastic component.

The objective is to soften or melt the surrounding polymer locally so that the material flows around the knurled external profile.

The insert should not simply be heated to a universal temperature.

The appropriate process window depends on:

• Polymer melting or softening behavior

• Glass-transition temperature

• Heat-deflection characteristics

• Insert geometry

• Insert mass

• Heating method

• Tool design

• Insertion speed

• Dwell time

• Polymer moisture condition

• Component geometry

For example, ABS, PC, PA66, and glass-filled PBT do not share one universal heat-staking temperature.

Therefore, the following ranges should be treated as development starting points rather than fixed production standards:

                  HEAT-SET INSERT PROCESS DEVELOPMENT

  Host Polymer Matrix         Typical Thermal Behavior       Process Development Focus
  -----------------------------------------------------------------------------------------
  ABS / Polycarbonate (PC)    Thermoplastic softening /      Establish insert temperature,
                              melt behavior depends on grade insertion speed and dwell time

  Polyamide 66 (PA66)         High-temperature engineering  Control heat input, moisture,
                              thermoplastic                 insertion force and cycle time

  Glass-Filled PBT            Reinforced engineering         Validate polymer flow around knurls,
                              thermoplastic                  boss cracking and retention

Actual production settings should be established experimentally for the specific resin and insert combination.

Heat-Set Process Variables

A controlled heat-set process normally monitors:

• Insert temperature

• Tool temperature

• Insertion force

• Insertion depth

• Insertion speed

• Heating time

• Cooling time

• Boss deformation

• Final insert height

• Insert perpendicularity

The goal is to achieve sufficient polymer flow around the knurl without overheating or degrading the surrounding plastic.

Ultrasonic Insertion

Ultrasonic brass inserts are installed using high-frequency mechanical vibration.

The vibration generates localized heat at the plastic-metal interface, allowing the polymer to flow around the external knurl.

Ultrasonic insertion can be highly effective for automated production, but the process requires validation of:

• Amplitude

• Weld/insertion time

• Downforce

• Tool geometry

• Insert geometry

• Polymer grade

• Boss geometry

A process that works for unfilled ABS may not work identically for PA66-GF30 or PBT-GF30.

Therefore, ultrasonic insertion parameters should always be developed against the actual material and insert design.

4.2 Mathematical Pull-Out & Torque Estimation

The ultimate axial holding capacity of an embedded knurled insert is related to the effective shear area between the polymer and the external retention geometry.

A simplified engineering relationship can be written as:

F_axial ≈ π × D_eff × L_eng × τ_eff

Where:

• D_eff = effective engagement diameter

• L_eng = effective engagement length

• τ_eff = effective shear strength of the polymer/insert interface

For a knurled insert, the actual load path is more complex than a simple cylindrical shear surface.

The result is influenced by:

• Knurl height

• Knurl pitch

• Groove geometry

• Polymer flow

• Local stress concentration

• Boss geometry

• Polymer orientation

• Installation quality

• Temperature

• Aging

Therefore, the equation should be used for conceptual sizing rather than as a guaranteed prediction of finished-part pull-out force.

Rotational Torque Consideration

Rotational resistance is controlled by the shear and bearing interaction between the external knurl profile and surrounding polymer.

A simplified design concept is:

T_resistance ∝ A_engagement × r_eff × τ_eff

Where:

• A_engagement = effective polymer engagement area

• r_eff = effective radial distance from the insert centerline

• τ_eff = effective polymer shear resistance

Increasing insert diameter, engagement length, and effective external retention can increase resistance, but only when the surrounding boss has sufficient structural capacity.

This is why simply increasing knurl depth may increase installation force and cracking risk without producing a proportional improvement in finished-joint performance.

5. Boss Design & Stress-Crack Mitigation

The plastic boss is frequently the limiting component in a threaded insert joint.

A properly designed plastic boss for brass threaded inserts should provide sufficient material around the insert to resist radial expansion and applied assembly loads.

The design should consider:

• Boss diameter

• Boss height

• Wall thickness

• Fillet radius

• Draft angle

• Insert diameter

• Knurl depth

• Pilot-hole diameter

• Polymer shrinkage

• Glass-fiber orientation

• Screw torque

Boss Cracking

Stress cracking can occur when installation forces exceed the local strength of the polymer.

The risk may increase with:

• Brittle polymer grades

• Excessive interference

• Large knurl depth

• Small boss diameter

• Thin boss walls

• Excessive installation speed

• Excessive heat

• Poorly controlled cooling

• High glass-fiber loading

• Sharp geometric transitions

A practical mitigation strategy is to optimize the complete system rather than simply reducing insert dimensions.

Potential corrective actions include:

• Increasing boss diameter

• Increasing local wall thickness

• Reducing excessive interference

• Adjusting pilot-hole diameter

• Modifying knurl geometry

• Reducing insertion speed

• Optimizing thermal energy

• Adding a suitable boss fillet

• Adjusting polymer grade or reinforcement

Glass-Filled Plastics

Glass-filled PA66 and PBT provide high stiffness and strength but can be less tolerant of aggressive insert interference.

Fiber orientation around the boss can also influence local strength.

Therefore, knurled brass inserts for PA66-GF and PBT-GF should be validated using actual molded production parts.

The pilot-hole diameter should be established from:

• Insert dimensions

• Resin grade

• Fiber percentage

• Molding shrinkage

• Production tolerance

• Installation method

• Required retention performance

There should not be one universal +0.08 mm or +0.15 mm correction for every glass-filled polymer.

This is an important distinction for tooling engineers because resin grade and processing conditions can significantly affect the correct pilot-hole dimension.

6. Industrial Application Profiles

JUXIN FASTENERS supplies knurled brass threaded inserts and other threaded insert solutions for demanding plastic-component applications.

Electric Power Tools & Outdoor Equipment

Typical applications include:

• Motor housings

• Gear covers

• Handle assemblies

• Battery housings

• Switch housings

• Charging equipment

• Tool body components

Power tools can expose plastic fasteners to:

• Dynamic vibration

• Repeated impact

• Screw-driving torque

• Thermal cycling

• Repeated service assembly

Knurled brass inserts can provide a reusable metallic thread while distributing load into the surrounding plastic.

For glass-filled nylon housings, insert geometry and boss design should be validated against the actual assembly torque and service environment.

Automotive Electronics & Under-Hood Modules

Potential applications include:

• Electronic control units

• Sensor housings

• Battery junction boxes

• Automotive connectors

• Plastic control modules

• Electrical enclosures

• EV component housings

Automotive applications may involve wide temperature fluctuations, vibration, humidity, and chemical exposure.

Instead of applying a universal temperature claim such as “−40°C to +150°C” to every insert, the complete assembly should be validated against the actual customer specification and operating environment.

Important validation areas may include:

• Thermal cycling

• Vibration

• Humidity

• Chemical exposure

• Pull-out retention

• Rotational torque

• Thread integrity

• Dimensional stability

Industrial Electrical Equipment

Applications include:

• Circuit breakers

• Terminal blocks

• Switchgear

• Electrical control panels

• Meter housings

• Power-control equipment

• Industrial electronic enclosures

Brass can be attractive in electrical applications because of its electrical and thermal conductivity as well as its machinability.

Where electrical grounding or conductivity is part of the design, however, the complete contact path and surface condition must be specified and validated.

Consumer Electronics & Precision Enclosures

Potential applications include:

• Laptops

• Handheld diagnostic instruments

• Smart home equipment

• Telecommunications equipment

• Small electronic housings

• Appliance controls

Small M1.6, M2, M2.5, and M3 brass threaded inserts can be used where compact reusable internal threads are required, subject to the available insert geometry and component design.

For thin-wall electronic housings, the main engineering challenge is often preventing:

• Boss bulging

• Sink marks

• Cracking

• Insert misalignment

• Cosmetic deformation

• Thread distortion

A properly designed post-mold installation process can help maintain consistent appearance and assembly performance.

7. Sourcing Matrix & Technical Procurement Specifications

For procurement specialists and supply chain developers issuing RFQs, specifying only “brass insert” is normally insufficient.

A professional threaded insert procurement specification should identify the complete part geometry and installation requirements.

                    JUXIN FASTENERS ORDERING SPECIFICATION

   [Insert Type] / [Thread Size & Pitch] / [Length]
   / [Material] / [External Geometry] / [Surface Finish]
   / [Plastic Material] / [Installation Method]

   Example:

   Knurled Brass Insert
   / M4 x 0.7
   / 8.5 mm
   / Brass CW603N
   / Dual Diamond / Diagonal Knurl
   / Plain
   / PA66-GF30
   / Heat-Set Installation

   Note:
   This is an RFQ specification example, not a universal JUXIN FASTENERS
   catalog part number. Final dimensions and material should be confirmed
   against the applicable engineering drawing.

Recommended RFQ Information

For custom knurled brass inserts for plastic, procurement teams should provide:

1. Insert Type: Heat-Set / Ultrasonic / Press-In / Self-Tapping / Molded-In / Custom

2. Thread Size: M1.6 / M2 / M2.5 / M3 / M4 / M5 / M6 / M8 / M10 / M12 or specified Unified thread

3. Thread Pitch: Specify metric pitch or Unified thread designation

4. Thread Tolerance: Specify required internal-thread tolerance

5. Insert Length: Specify nominal length

6. Outside Diameter: Specify nominal body and knurl diameter

7. Knurl Geometry: Straight / Diamond / Diagonal / Opposing / Stepped / Custom

8. Material: Brass / Lead-Free Brass / Aluminum / Steel / Stainless Steel

9. Surface Finish: Plain / Nickel / Zinc / Other

10. Plastic Resin: PA66 / PA66-GF / PBT / PBT-GF / ABS / PC / PC-ABS / PPS / PEEK / Other

11. Plastic Thickness: Specify nominal and minimum thickness

12. Boss Dimensions: Specify boss diameter, height, wall thickness, and available installation space

13. Pilot Hole: Specify existing hole diameter and tolerance if known

14. Installation Method: Heat / Ultrasonic / Press / Other

15. Required Pull-Out Force: Specify minimum acceptance value

16. Required Rotational Torque: Specify minimum acceptance value

17. Assembly Screw: Specify screw size, length, thread, and tightening torque

18. Environmental Conditions: Temperature, humidity, chemicals, vibration, thermal cycling

19. Annual Quantity: Estimated yearly demand and batch quantity

20. Quality Documentation: Inspection report, material certificate, PPAP, sample approval, or other customer-specific requirements

8. Related Fastener Technical Guides & Internal Links

Explore the JUXIN FASTENERS technical library to optimize fastening systems across different materials and component categories:

• Threaded Inserts for Plastics: Engineering Installation Guide
  https://www.juxinfasteners.com/industrial-solutions/thread-insert-nuts-engineering-installation-guide/

  In-depth analysis of self-tapping, press-in, heat-set, molded-in, and other threaded insert solutions for plastic components.

• Specialized Nut Engineering Guide: Cap Nuts, Wing Nuts & Titanium Flange Nuts
  https://www.juxinfasteners.com/industrial-solutions/cap-nuts-wing-nuts-titanium-flange-nuts-engineering-guide/

  Material selection and engineering considerations for specialized nut applications.

• Bolt Exposed Thread Length Standards & High-Vibration Lock Nuts
  https://www.juxinfasteners.com/technical-guide/bolt-exposed-thread-length-anti-loosening-fasteners/

  Structural thread engagement, exposed thread length, and locking-nut selection for vibration-sensitive applications.

• Self-Clinching Fasteners
  https://www.juxinfasteners.com/products/self-clinching-fasteners/

  Compare permanent mechanical fastening solutions for sheet metal with threaded inserts used in plastic components.

• Weld Fasteners
  https://www.juxinfasteners.com/products/weld-fasteners/

  Related permanent fastening solutions for fabricated sheet-metal assemblies.

• Automotive Fasteners & Hardware Parts
  https://www.juxinfasteners.com/products/automotive-fasteners-hardwares-parts/

  Related fastening components for automotive and EV manufacturing applications.

9. Information Gain: Why Knurl Geometry Must Match the Plastic

A common mistake in plastic fastening is to assume that a more aggressive external knurl will automatically produce a stronger insert.

In reality, insert retention is a system property.

The load path is:

Assembly Screw → Internal Thread → Brass Insert → External Knurl → Polymer Boss → Plastic Component

If the internal thread is strong but the boss cracks, the joint fails.

If the boss is strong but the insert rotates, the joint fails.

If pull-out strength is sufficient but rotational torque resistance is too low, the assembly can still fail during screw installation.

Therefore, engineers should balance:

• Insert diameter

• Insert length

• Knurl geometry

• Knurl depth

• Pilot-hole diameter

• Boss diameter

• Boss wall thickness

• Polymer grade

• Glass-fiber content

• Installation temperature

• Installation force

• Screw torque

• Environmental exposure

Pull-Out Strength vs. Rotational Torque

These are different performance characteristics.

Pull-out strength measures resistance against axial extraction.

Rotational torque resistance measures resistance against rotation.

Increasing insert length may significantly improve pull-out resistance but may have a smaller effect on rotational torque if the boss geometry remains unchanged.

Increasing insert diameter can increase the effective retention radius, but may also increase installation force and hoop stress.

Increasing knurl depth can increase mechanical engagement, but may increase cracking risk in brittle or glass-filled polymers.

This is the type of engineering trade-off that should be evaluated before selecting a knurled brass threaded insert.

10. Strategic Sourcing & Custom Manufacturing

For procurement and strategic sourcing teams, the ideal supplier should be capable of supporting both standard brass threaded inserts and custom insert geometries.

JUXIN FASTENERS supports sourcing and manufacturing requirements for:

• Knurled brass inserts

• Brass threaded inserts

• Heat-set brass inserts

• Ultrasonic brass inserts

• Press-in brass inserts

• Self-tapping inserts

• Threaded inserts for injection molded plastics

• Plastic insert nuts

• Custom thread inserts

• Aluminum inserts

• Steel inserts

• Stainless steel inserts

• Custom cold-formed fasteners

• CNC-machined fastening components

Manufacturing processes may include:

• Cold forming

• CNC machining

• Automatic turning

• Stamping

• Threading

• Knurling

• Surface finishing

• Dimensional inspection

For custom projects, engineering drawings and actual application conditions are especially valuable.

A complete technical inquiry should include:

• 2D engineering drawing

• 3D CAD model where available

• Thread size

• Insert length

• Outside diameter

• Knurl geometry

• Material

• Surface finish

• Plastic resin

• Glass-fiber percentage

• Component thickness

• Boss dimensions

• Pilot-hole diameter

• Installation method

• Required pull-out force

• Required rotational torque

• Assembly screw torque

• Operating temperature

• Environmental conditions

• Annual quantity

• Packaging requirements

This information allows the supplier to evaluate the insert as part of the complete plastic fastening system rather than as an isolated metal component.

Technical Engineering Support & Commercial Inquiries

JUXIN FASTENERS supplies standard and custom fastening components for OEM, automotive, EV, electronics, power tools, industrial machinery, electrical equipment, and other manufacturing applications.

Our manufacturing capabilities include cold forming, CNC machining, turning, stamping, knurling, threading, and inspection processes selected according to product geometry, material, and production requirements.

For knurled brass inserts for plastic, our technical evaluation can focus on:

• Brass material selection

• Thread size and tolerance

• Knurl geometry

• Insert length

• Pilot-hole requirements

• Plastic boss design

• Heat-set installation

• Ultrasonic insertion

• Press-fit installation

• Pull-out performance

• Rotational torque

• Surface treatment

• Environmental requirements

• Custom dimensions

Contact our engineering and sourcing team for drawings, samples, technical specifications, and custom manufacturing inquiries.

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

Engineering & Sourcing Support:
info@juxinfasteners.com

Core Manufacturing Capabilities:
Precision Knurled Brass Inserts, Brass Threaded Inserts, Thread Inserts for Plastics, Heat-Set Inserts, Ultrasonic Inserts, Custom Threaded Inserts, Precision Cold-Formed Fasteners, and Custom CNC Turned Hardware.