Injection‑Molded Components
GX precision insert overmolding supports 1.0mm thin walls, complex bores and integrated shafts / splines. 5000–7000Gs multi-pole magnetization in one shot, no cracking, gluing or secondary machining.
Bonded NdFeB Magnet
Bonded NdFeB Magnets Manufacturer
GX Magnet supplies custom bonded NdFeB magnets through injection-molded and compression-bonded routes. The forming method is selected from the drawing, magnetic target, tolerances, operating environment and production requirement—not from the product name alone.
- Injection and compression routes for different geometry and magnetic targets
- Thin-wall, insert-molded and 2–64-pole component configurations
- Minimum magnetic limits—not typical values alone—with SPC and PPAP support
Magnet Manufacturing Experience Since 1992 Supporting Bonded NdFeB Programs
BEFORE QUOTATION
Define the Bonded NdFeB Route and Acceptance Basis
Submit one controlled RFQ package covering the forming route, material system, drawing interfaces, finished-part magnetic output, operating conditions, tooling terms and release records. GX uses these inputs to confirm manufacturability, sampling and recurring-production controls.
Forming Route and Material SystemSpecify injection molding or compression bonding, the NdFeB compound target, isotropic or anisotropic orientation and magnetization route. For injection-molded parts, identify PA12, PPS or another approved binder based on temperature, moisture and media exposure.
Drawing and Critical InterfacesProvide the released 2D/3D drawing and revision with datums, tolerances, thin-wall sections, holes and molded features. Define shaft, hub, sleeve, insert or adhesive interfaces together with applicable runout, retention or transmitted-torque requirements.
Magnetic Output and Operating LimitsDefine finished-part flux, surface field, polarity, pole pattern or waveform with the measurement position, air gap, fixture and temperature. Include continuous and peak temperature, moisture, refrigerant, oil, coolant, speed, load and opposing-field conditions.
Tooling, Demand and Release RecordsBefore tooling approval, confirm sample quantity, annual demand, tool ownership, expected tool life and maintenance responsibility. First-article dimensional results, lot records, statistical data for agreed critical characteristics and any customer-required PPAP submission are defined by the project.
PRODUCT SELECTION
Select the Bonded Magnet Route for Your Component
Compare the magnetic material, forming route and component geometry before selecting a product page. Injection molding supports complex features and insert integration, while compression bonding is generally used for simpler geometries requiring higher magnetic-powder loading.
Why choose us for your project
Engineer‑Grade Bonded NdFeB: High Precision & Integrated Magnetic Solutions
Choosing bonded NdFeB by catalog Br alone often leads to misaligned processes, poor geometry fit and costly rework. GX evaluates magnetic performance, part geometry, insert interfaces, operating temperature and production volume before tooling. Our injection grade delivers stable 5000–7000Gs Br, balancing magnetic output and integrated molded features.
Compression-Bonded Magnets
GX high-density compression formula maximizes flux density. Delivers Br up to 7400Gs for rings and discs, ideal for high-flux projects prioritizing magnetic performance.
Binder and Duty Review
GX grades PA12 / PPS binders for moisture, chemical and dimensional stability. Fully validated for -40°C~120°C continuous operation, proven for automotive and industrial mass production.
Why choose us for your project
GX Engineering: Select the Right Bonded NdFeB Route Before Tooling
Catalog Br values alone are not enough to define the optimal forming process. Standard injection-bonded NdFeB covers Br 0.35–0.65T, Hcj 600–1200kA/m and (BH)max 4–10MGOe. GX jointly evaluates material targets, part geometry, binder type, pole pattern, operating conditions and acceptance criteria to lock in full feasibility before tooling.
Injection-Molded Components
GX precision molding supports drawing-defined walls down to 0.3mm, complex bores, locating features, integrated shafts/sleeves and 2–64 pole patterns. GX pre-evaluates compound flow, insert geometry and magnetizing fixture design to confirm feasibility upfront.
Compression-Bonded Magnets
GX high-density compression process delivers 5.5–6.2g/cm³ powder density — significantly higher than 3.4–5.5g/cm³ for injection grades. Ideal for rings, discs and press-compatible parts where maximum flux density is prioritized.
Binder and Operating-Duty Review
GX matches PA12, PA66 and PPS binders to your application, validated for moisture, refrigerant, oil, chemical resistance and dimensional stability. Operating range 100–150°C, tailored to binder grade, magnet material, geometry and magnetic circuit.
Why choose us for your project
GX Integrated Control: Inserts, Dimensions & Pole Pattern Aligned
A sample may pass initial magnetic targets but still fail in final assembly due to insert offset, molding shrinkage, moisture-driven dimensional shift or pole position error. GX aligns compound formulation, datum system, tooling and magnetizing fixture to guarantee consistent finished-part performance.
Compound and Environment
GX validates PA12 / PPS compounds against long-term & peak temperature, moisture, coolant, refrigerant and all drawing-specified operating media.
Mechanical Interface Control
GX verifies insert position, mating dimensions, runout, pull-out force and transmitted torque against the released datum scheme for assembly compatibility.
Magnetic Pattern Control
GX inspects pole count, polarity, position and pole-to-pole output at specified air gap, fixture and temperature for consistent in-circuit performance.
Product and supply scope
What Is a Bonded NdFeB Magnet?
A bonded NdFeB magnet combines NdFeB magnetic powder with a polymer binder. Injection molding supports thin sections, complex net shapes, molded locating features and integrated inserts; compression bonding supports press-compatible rings, discs and other regular geometries with a different magnetic-powder density and tooling envelope.
GX supplies both routes to customer drawings. The forming process, binder, geometry, magnetization and inspection method are selected together; automotive injection-molded components are qualified separately from compression-bonded magnets and non-automotive parts.
Drawing-based supplyGX locks in all dimensions, tolerances, datums, magnetization direction and interface requirements before tooling starts.
Material reviewGX qualifies magnetic powder grades and binder systems against your specific application conditions.
Sample releaseAll production batches are governed by approved samples and agreed dimensional & magnetic specifications.
Separate scopeGX standard supply covers bonded magnet units and integrated pre-inserted assemblies.
Drawing variables
Choose the Forming Route from Geometry, Duty and Magnetic Output
Route selection starts with the finished component: its shape, integrated interfaces, magnetic circuit, operating environment and mass-production requirements. GX matches the optimal process with verified performance data.
Technical parameters for quotation
Use Material Data for Selection and Finished-Part Limits for Release
Published material data supports compound and forming-route selection. As industry references, injection-molded bonded NdFeB typically contains approximately 65–90 wt% magnetic powder with a density of 3.4–5.5 g/cm³, while compression-bonded grades commonly reach 5.5–6.2 g/cm³. Finished-part dimensions, magnetic output, mechanical retention and environmental limits are released only against the approved drawing and agreed test conditions.
| Parameter group | Project-specific review basis | Release basis |
|---|---|---|
| Material / forming route | Select injection molding for thin walls, complex bores and molded-in shafts or sleeves; select compression bonding for press-compatible rings and discs requiring higher magnetic-powder density. Review the approved compound, NdFeB grade, orientation and PA12, PPS or other binder system. | Approved compound code, binder and forming route. Br, Hcb, Hcj and (BH)max are reported at 20°C when required by the specification. |
| Geometry and tolerances | Define OD, ID, wall thickness, holes, datums, insert position and critical fits. Automotive insert-molded components commonly use project targets of ±0.02–0.05 mm for critical dimensions and 0.02–0.03 mm for coaxiality or runout, subject to part size and geometry. | Released drawing, agreed datum scheme and first-article dimensional report. |
| Magnetic requirement | Industry reference ranges for injection-molded bonded NdFeB include Br of approximately 0.35–0.65 T, Hcj of 600–1,200 kA/m and (BH)max of 4–10 MGOe. Finished-part flux, surface field, pole position and waveform remain geometry- and circuit-dependent. | Acceptance limits released with the measurement point, air gap, fixture, magnetization condition and temperature defined. |
| Mechanical interface | Define the shaft, sleeve, hub, insert or adhesive interface together with pull-out force, transmitted torque and retention method. Some small automotive rotor programs use reference targets of ≥50 N pull-out force and ≥0.5 N·m transmitted torque, depending on shaft diameter and insert design. | Released interface drawing and agreed pull-out, torque, retention or runout test method. |
| Operating environment | Bonded NdFeB operating-temperature references are commonly 100–150°C, depending on magnetic grade, binder, geometry and magnetic circuit. Specify long-term and peak temperature together with moisture, refrigerant, oil, coolant or chemical exposure. | Approved validation cycle stating temperature, exposure medium, duration, sample condition and pass criteria. |
| Inspection and release | Define FAI characteristics, magnetic acceptance, sampling frequency and lot-based SPC records. Where contractually required, automotive programs commonly specify Cpk ≥1.33, or ≥1.67 for selected special characteristics. | Approved control plan, lot-release records and the customer-required PPAP submission level. FAI, SPC and Cpk are production-quality records rather than default third-party tests. |
| Supply and tooling boundary | Confirm whether the quotation covers the magnet only or an insert-molded component, including metal inserts, magnetization and inspection. State sample quantity, annual demand, tool ownership, expected tool life and maintenance responsibility before tooling release. | Quotation, tooling agreement, released drawing and approved project documentation. |
Project route
From Route Selection to Documented Series Release
Injection molding and compression bonding follow different forming windows, but both routes connect the approved compound, tooling, magnetization and inspection method to the released component.
Application and Drawing Review
Geometry, interfaces, magnetic function, temperature, media exposure and demand are reviewed together.
Route and Binder Selection
Injection or compression bonding and the proposed binder are selected from geometry, integration and operating duty.
Tooling and Measurement Plan
Datums, shrinkage, insert loading, magnetizing access, gauges and acceptance methods are agreed before tooling.
Forming and Magnetization
The approved compound is formed, post-processed where specified and magnetized to the released pole pattern.
FAI and Sample Approval
Critical dimensions, insert position, appearance and magnetic output are recorded under defined conditions.
Recurring Production Release
Approved revisions, control-plan checks, applicable SPC and lot records govern recurring production.
Verification
Connect Sample Approval to Recurring Lot Release
The inspection plan links material identity, formed geometry, integrated interfaces and magnetic output to the same approved drawing and measurement conditions.
| Inspection item | Control approach | Why the buyer needs it |
|---|---|---|
| Material and revision | Compound identity, binder, drawing revision and tooling status confirmed for the inspected lot | Prevents unapproved material or process changes |
| Dimensions and inserts | Critical fits, datums, insert position, coaxiality or runout checked by the agreed method | Controls assembly fit, working gap and mechanical location |
| Pole pattern | Polarity, pole count, pole sequence and pole position verified against the orientation drawing | Reduces commutation, sensing and installation errors |
| Finished magnetic output | Flux, surface field or waveform measured at the specified position, air gap, fixture and temperature | Confirms the finished part rather than catalog typical values alone |
| Mechanical and appearance | Retention, torque or pull-out checks where specified; flash, surface and edge criteria follow the approved standard | Reduces loosening, contamination and assembly interference |
Automotive application fit
Automotive Injection-Molded NdFeB Components by Operating Duty
These automotive examples apply to the injection-molded route. Each component is released from its mating interface, pole pattern, operating environment and project-specific validation plan.
Door-Lock and Steering Components
Door-lock motor rings and steering sensor targets require controlled bore or spline fit, dimensional stability and repeatable pole position. GX reviews PA12 or PPS, the shaft interface, working air gap and waveform method before sample approval.
Headlamp Stepper-Motor Rotors
Headlamp adjustment rotors combine a multipole pattern with an integrated shaft or insert. PPS-based compounds, insert position, runout, retention and pole-to-pole output are evaluated for the released temperature duty.
Electronic Expansion-Valve Rotors
Expansion-valve rotors require stable insert coaxiality, multipole output and cleanliness in refrigerant and oil exposure. Compound compatibility, insert position, particles and magnetic acceptance are defined in the validation plan.
Coolant-Pump and Exhaust-Actuator Rotors
These rotors are reviewed for elevated temperature, coolant or exhaust exposure, transmitted torque and demagnetizing conditions. PPS selection, insert retention and finished-part magnetic output follow the released duty cycle.
Automotive quality-system support
Release Bonded NdFeB Lots With Traceable Project Records
GX applies its IATF 16949 quality system to approved compounds, drawing revisions, sample results, project-defined inspection and recurring lot release.
Material and Revision Traceability
Compound batch, binder, drawing revision, tooling status and magnetizing setup are linked to the applicable production records.
FAI and Capability Evidence
First-article dimensions, insert position and magnetic output are recorded; applicable SPC or capability data follows the agreed control plan.
Customer-Required PPAP
PPAP records are prepared according to the required submission level and GX responsibility, including PFMEA, control plan, dimensional and performance evidence where applicable.
The exact inspection frequency, sample size, capability requirement, reliability report and PPAP content are confirmed in the quotation, released specification and customer approval plan.
Buyer communication
Review Bonded NdFeB Projects With GX Engineers
GX Magnet uses industrial exhibitions to present magnetic materials, molded components and motor-part capabilities to OEM buyers, engineers and sourcing teams.
Bring a drawing, mating-component information or a magnetic-function question. The discussion can identify the material route, interface risks and RFQ information needed before formal engineering review.
Sample Review
Compare geometries, inserts and product forms before choosing the quotation route.
Engineering Discussion
Review pole patterns, interfaces, environment and validation expectations.
Supplier Evaluation
Plan drawing review, sample approval, inspection evidence and recurring communication.
Engineering and sourcing FAQ
Bonded NdFeB Decisions to Resolve Before Tooling
These questions separate injection and compression bonding, define automotive component risks and establish the evidence required for sample and recurring-production release.
How do injection-molded, compression-bonded and sintered NdFeB magnets differ?
Injection molding supports thin walls, complex bores, molded locating features and integrated inserts. Compression bonding suits press-compatible rings and discs requiring higher magnetic-powder density. Sintered NdFeB follows a separate high-density route with different machining, coating and assembly requirements. Select from the finished geometry, magnetic circuit, operating duty and production volume.
How should PA12 or PPS be selected for an automotive injection-molded NdFeB component?
Review long-term and peak temperature, moisture, dimensional stability, refrigerant, oil, coolant or other specified media. PPS is evaluated for elevated-temperature and demanding media programs; PA12 can support other molded automotive components. The exact compound and operating limit require project approval.
Which dimensions and interfaces require control on an insert-molded magnet?
Control the dimensions that establish mating fit, working air gap and mechanical location: critical OD or ID, bore or spline, datums, insert position, coaxiality and runout. Pull-out force, transmitted torque or retention should be specified only with the insert geometry and agreed test method.
What magnetization information is required for a multipole bonded NdFeB part?
Provide magnetization direction, pole count, polarity sequence, working face and pole-position requirement. Define whether acceptance uses flux, surface field or waveform and state the measurement position, air gap, fixture and temperature.
How are temperature, moisture and automotive media included in material approval?
State the media type, concentration or oil combination where applicable, exposure temperature, duration and pass criteria. Dimensional change, weight change, cracking, particle release and magnetic output can then be evaluated under the approved validation plan rather than from a universal temperature claim.
How does GX control magnetic variation from samples to recurring lots?
The approved compound, drawing revision, tooling status, magnetizing setup and inspection method are linked to production records. Finished-part limits are checked using the defined fixture and measurement conditions, with applicable SPC and lot-release records included in the agreed control plan.
What should an automotive bonded NdFeB RFQ include?
Send the 2D/3D drawing and revision, application, injection or compression route if known, binder or environmental duty, critical interfaces, pole pattern, magnetic acceptance method, sample and annual demand, tooling boundary and required PPAP submission level.
How are samples and PPAP records approved before recurring production?
Agree the drawing revision, compound, tooling state, FAI characteristics, magnetic test method, reliability scope and any permitted deviation before release. PPAP records are prepared according to the customer-required level and GX responsibility; recurring lots then follow the released specification and control plan.
Request for quotation
Request a Drawing Review for Bonded NdFeB Components
Submit one project package covering the forming route, material system, interfaces, magnetic acceptance, operating duty, tooling boundary and required automotive release evidence.
- 2D/3D drawing, revision, critical dimensions, datums and annual demand
- Injection or compression route, PA12/PPS or other binder and magnetic target
- Pole count, polarity, pole position, waveform method and working air gap
- Insert or shaft interface, temperature, moisture, refrigerant, oil, coolant and load
- Tool ownership, sample approval, SPC expectations and required PPAP level