Working Field at the Sensor Plane
TMR angle-sensor programs can require an in-plane field of 6–20 mT at the sensor. GX aligns axial or diametric magnetization, disc diameter, thickness and the specified air gap to the target field window.
INJECTION-MOLDED NdFeB · DISC GEOMETRY
Bonded Neodymium Disc Magnets for OEM Applications
GX supplies injection-molded bonded NdFeB disc magnets for OEM assemblies requiring a flat magnetic component with axial or diametric magnetization. Material screening uses Br 0.35–0.65 T, Hcj 600–1,200 kA/m and (BH)max 4–10 MGOe at 20°C; the released specification defines disc diameter, thickness, working face, center configuration, magnetic direction and installation condition.
- Flat disc geometries with drawing-defined diameter, thickness and center configuration.
- Axial or diametric magnetization matched to the component’s working face and magnetic circuit.
- Dimensions, magnetic acceptance and installation conditions recorded for sample approval.
Before quotation
Confirm Disc Drawing Inputs Before Quotation
A complete RFQ package helps GX review the bonded NdFeB compound, disc geometry, magnetization direction, working face and inspection method before sampling or tooling is quoted.
Drawing, geometry and interfaceProvide the 2D/3D drawing and revision, including diameter, thickness, flatness, edge condition, datum scheme, center hole or recess, and the mating face used in the customer assembly.
Material and functional targetConfirm the bonded NdFeB compound, binder system, isotropic or anisotropic condition, axial or diametric magnetization, and the required surface field, flux or pull-force target at the defined position.
Operating boundaryState the operating temperature range, corrosion medium, impact or vibration exposure, adhesive contact, nearby metal parts and opposing magnetic field that may affect the finished disc.
Demand and acceptanceConfirm sample quantity, expected annual demand, drawing revision control, visual criteria, dimensional inspection plan and magnetic test method for sample approval and recurring lot release.
Product relationship
Select the Closest Existing Product Category
Use this section to move from the bonded neodymium disc page to the nearest material, forming route or geometry category. Choose the related page when the drawing changes from a solid disc to a ring, rotor, insert-molded part or broader injection-molded component.
Why choose us for your project
Engineer the Disc for the Required Field and Interface
GX reviews injection-molded bonded NdFeB discs from material data at 20°C through the sensor field, center feature and retention interface. Typical compound screening starts with Br 0.35–0.65 T, Hcj 600–1,200 kA/m and (BH)max 4–10 MGOe, then links these inputs to drawing-defined dimensions and working conditions.
Each disc is reviewed as a functional magnetic component: the working face establishes the magnetic output, while the opposite face and center feature establish the mounting datum and retention path.
Disc Geometry and Locating Datum
OD, thickness, center bore or recess, flatness and axial or radial runout are assigned to released datums. Injection-molded feasibility is reviewed against wall section and a ±0.003 in/in dimensional reference before drawing limits are released.
Material, Environment and Retention
Material selection combines the 20°C magnetic report with the specified operating temperature, moisture or media exposure, plus adhesive or mechanical retention requirements. The mating face, insert position and inspection method are defined for sample approval.
Why choose us for your project
Match the Forming Route to Disc Features and Magnetic Loading
GX selects injection molding or compression bonding from the disc diameter, thickness, center feature, magnetic target and recurring volume. Injection-molded bonded NdFeB compounds typically use 50–75 vol.% magnetic powder, while compression bonding can support up to 85 vol.% for programs requiring a higher material-energy target.
Tooling anCompound Loading and Disc Geometryd shrinkage review
Magnetic-powder loading, wall section and center geometry are reviewed as one forming condition. Injection molding supports formed recesses, locating features and integrated interfaces; compression bonding provides a route for higher powder loading in flat-disc geometries.
Tooling, Shrinkage and Datum Control
Parting line, wall section, gate position, center feature and inspection datum are fixed in one tooling review. An initial injection-molding reference of ±0.003 in/in supports feasibility planning for OD, thickness, flatness and the locating feature before drawing limits are released.
Magnetization Fixture and Sample Route
The working face, axial or diametric magnetization direction, measurement position and sample fixture are defined with the forming route. For TMR angle-sensor programs, a 6–20 mT in-plane field at the sensor provides a measurable target for disc geometry, magnetization and air-gap review.
The released route records the compound, tooling datum, magnetizing fixture and inspection condition used for sample approval and recurring production.
Why choose us for your project
Release Repeat Lots From the Same Measured Conditions
GX releases bonded NdFeB discs using one approved drawing, one measurement condition and recorded results for dimensions and magnetic function. The release package connects 20°C material data with finished-part values measured at the specified fixture, position, air gap and temperature.
The same acceptance basis follows sample approval and recurring production, covering the disc working face, center datum and retention interface.
Dimensional Evidence at the Released Datum
First-article inspection records OD, thickness, center bore or recess, flatness and axial or radial runout in mm against the released drawing. The measurement record identifies the datum, gauge or CMM setup and sample status.
Magnetic Function at the Defined Air Gap
Material reports record Br, Hcb, Hcj and (BH)max at 20°C. Finished discs are measured for surface field or flux at the stated fixture and air gap; TMR angle-sensor applications can use a 6–20 mT in-plane field target.
Lot Record and Functional Screening
The approved drawing revision, compound batch, mold, magnetizing fixture and inspection result form the lot-release record. Projects that define signal output as critical can include 100% flux or field screening in the agreed inspection plan.
First-Article Approval
The first article links actual mm dimensions, magnetic results and the agreed test fixture to the released drawing revision.
Recurring Lot Release
Recurring lots follow the approved compound, tooling, magnetizing fixture and drawing-defined inspection characteristics.
Supply boundary
GX supplies the approved bonded NdFeB disc and the drawing-defined magnetization, inspection and documentation scope.
Product and supply scope
What Is a Bonded Neodymium Disc Magnet?
A bonded neodymium disc magnet is a flat circular magnetic component made from NdFeB magnetic powder and a polymer binder. GX reviews solid discs and drawing-defined center features by diameter, thickness, flatness, working face, magnetization direction and acceptance method.
Typical material screening for injection-molded bonded NdFeB uses Br 0.35–0.65 T, Hcj 600–1,200 kA/m and (BH)max 4–10 MGOe at 20°C. Finished-part output is released by the drawing-defined geometry, magnetization condition and measurement position.
Drawing-Based Disc SupplyDiameter, thickness, flatness, edge condition, center hole or recess, datum and mating face are confirmed from the released drawing before sampling or tooling.
Material and Magnetization ReviewNdFeB compound, polymer binder, isotropic or anisotropic condition, axial or diametric magnetization and surface field, flux or pull-force target are reviewed together.
Sample Approval BasisSample release can include dimensional inspection, appearance criteria, polarity check and magnetic output measured at the agreed position, air gap, fixture and temperature.
Confirmed Supply BoundaryThe quoted scope covers the bonded NdFeB disc magnet and the agreed magnetization, inspection, packaging and documentation items listed in the quotation or drawing release.
Drawing variables
Disc Variables to Confirm Before Quotation
Disc quotation is reviewed around the features that affect molding, magnetization and inspection: diameter, thickness, flatness, center features, working face, magnetic direction and mating method.
Technical parameters for quotation
Confirm Bonded Neodymium Disc Values Before Sample Release
Reference material ranges support early selection. Project values become supply commitments when the bonded NdFeB compound, disc geometry, magnetization, inspection method and release records are fixed in the drawing, quotation and acceptance plan.
| Parameter group | Project-specific review basis | Release basis |
|---|---|---|
| Material / Route | Bonded NdFeB compound, binder system, isotropic or anisotropic condition, injection or compression bonding route; Br, Hcj and (BH)max at 20°C when specified. | Approved material specification, released drawing and sample test record. |
| Geometry and Tolerances | Diameter, thickness, flatness, parallelism, edge condition, chamfer, center hole, recess and drawing datum used for inspection. | Released drawing, dimensional inspection method and first-article report. |
| Magnetic or Functional Requirement | Axial, diametric or drawing-defined magnetization; surface field, flux, pull force or functional response measured at the specified position. | Approved magnetic test method, fixture, air gap, temperature and acceptance limit. |
| Mechanical / Assembly Interface | Working face, bonding face, carrier pocket, locating feature, adhesive contact, retention surface and mating-part relationship. | Assembly interface drawing, fit requirement and retention or bonding validation when specified. |
| Operating Environment | Operating temperature range, humidity, corrosion medium, impact, vibration, adhesive exposure, nearby metal parts and opposing field. | Project specification, environmental test plan and pass criteria. |
| Inspection and Acceptance | Dimensional checks, appearance criteria, polarity check, magnetic output test, sampling quantity and inspection frequency. | Control plan, sample approval record and recurring lot-release record. |
| Supply Boundary | Bonded NdFeB disc magnet, agreed magnetization, inspection, packaging and documentation; additional assembly scope only when released. | Quotation, approved drawing and purchase specification. |
Project route
From Disc Drawing Review to Sample Approval
The project route connects the bonded NdFeB compound, disc geometry, forming route, datum scheme, magnetization direction and inspection method before the sample is released for customer approval.
Drawing and Application Review
Disc diameter, thickness, center features, working face, mating method and operating condition are reviewed from the drawing and RFQ input.
Material and Forming Route
Bonded NdFeB compound, binder system, isotropic or anisotropic condition, and injection or compression bonding route are selected for the required geometry and magnetic target.
Tooling and Datum Review
Parting line, shrinkage allowance, center feature, edge condition, inspection datum and measurement access are confirmed before tooling release.
Molding and Secondary Operations
The selected forming route defines molded features, edge finishing, center-hole or recess treatment, and any drawing-required secondary operation.
Magnetization and Sample Testing
Axial, diametric or drawing-defined magnetization is checked together with polarity, surface field, flux or pull force at the agreed position and test condition.
Recurring Production Release
Approved drawing revision, sample record, inspection method, acceptance limit and lot-release record are used to control repeat orders.
Verification
Verify Disc Flatness, Interface Fit and Magnetic Response
GX verifies disc dimensions, flatness, mating features, pole orientation and magnetic output against the released drawing and approved sample. Measurement conditions and acceptance limits are defined before recurring production so each batch is evaluated using the same criteria.
| Inspection item | Verification method | Why it matters to the buyer |
|---|---|---|
| Disc dimensions and flatness | Measure thickness, OD/ID, flatness, parallelism and datum features using the drawing-specified gauges or optical measurement method. | Maintains seating accuracy, assembly clearance and a consistent working air gap. |
| Mating interface | Verify position, concentricity, runout, press-fit retention or transmitted torque where required by the drawing. | Supports stable positioning and mechanical load transfer in the finished assembly. |
| Magnetic output | Measure flux, surface field, pole-to-pole output or functional waveform under the agreed fixture, air-gap and temperature conditions. | Confirms that production parts match the approved magnetic design and application response. |
| Polarity and pole pattern | Verify magnetization direction, pole count and pole sequence against the approved orientation drawing. | Prevents installation errors and incorrect sensor or motor commutation signals. |
| Appearance and edges | Inspect flash, chips, cracks, contamination and edge profile against the approved visual standard. | Reduces assembly interference and avoids appearance-related acceptance disputes. |
Application fit
Where Bonded Neodymium Disc Magnets Fit OEM Assemblies
Application fit is reviewed by disc geometry, working face, magnetization direction, operating condition and the way the magnet is retained in the customer assembly.
Position Sensors
For position-sensing projects, define the disc diameter, thickness, working face, axial or diametric magnetization, target field position and sensor gap. Sample approval records dimensional results and magnetic response under the agreed test condition.
Compact Actuators
For compact actuators, the disc magnet is reviewed with the bonding face, carrier pocket or mechanical retention feature. Diameter, thickness, edge condition, pull force or flux target, temperature range and load direction are confirmed before sample release.
Instrument Assemblies
For instrument assemblies, flatness, edge condition, magnetic direction and corrosion exposure can affect fit and signal response. GX checks the disc against the drawing-defined dimensions, appearance criteria and magnetic acceptance method.
Carrier-Mounted Discs
For carrier-mounted designs, the disc is evaluated together with the pocket, adhesive area, locating face or insert relationship. The released requirement defines disc geometry, working face, magnetization, retention method and inspection basis.
Quality-system support
Inspection Records for Bonded Neodymium Disc Release
GX Magnet applies its IATF 16949 quality system to drawing revision control, sample approval, inspection planning and lot-release records for bonded neodymium disc projects.
Revision Control
Disc diameter, thickness, center features, working face, magnetization direction and appearance criteria follow the approved drawing revision.
Sample Approval
Sample records include dimensional results and agreed magnetic or functional checks before the part is released for recurring production.
Production Inspection
Inspection scope, sampling quantity, gauge or fixture, measurement position and lot-release record are confirmed before recurring orders are released.
Project-specific certificates, inspection records and magnetic performance data can be provided during sample approval or project review according to the approved drawing and agreed acceptance criteria.
Buyer communication
Review Bonded Disc Requirements With GX Engineers
Use the buyer meeting to connect the drawing, mating component, working face and magnetic target before the RFQ is released. GX engineers can review disc diameter, thickness, center features, magnetization direction, operating condition and the inspection basis needed for sample approval.
Sample Review
Compare solid discs, center-featured discs, ring parts and molded magnetic components so the RFQ is directed to the correct product category and forming route.
Engineering Discussion
Review diameter, thickness, flatness, datum scheme, mating face, adhesive area or carrier pocket together with the required axial or diametric magnetization.
RFQ Alignment
Confirm the RFQ inputs for material selection, tooling review, sample quantity, inspection method, acceptance criteria and recurring lot-release-release records.
Engineering and sourcing FAQ
Bonded Neodymium Disc Magnet FAQs for OEM Buyers
Answers to common engineering and sourcing questions about bonded neodymium disc magnet material selection, disc dimensions, magnetization direction, operating conditions, inspection methods and sample release.
How do Bonded neodymium disc magnets differ from bonded and sintered neodymium discs?
The main differences are the material route, achievable geometry, magnetic output and assembly method. Compare them in the actual magnetic circuit and operating condition; the product name alone is not enough to select the part.
How should engineers select the material for Bonded neodymium disc magnets?
Start with NdFeB compound, binder and axial or diametric orientation. Then check the required magnetic output, geometry, temperature and commercial volume before fixing a grade in the drawing.
Which dimensions should be toleranced on Bonded neodymium disc magnets?
Control the dimensions that set fit, air gap or working position. For this product, review diameter, thickness, flatness, edge condition and magnetization direction; avoid applying a tight general tolerance to non-functional surfaces without a measurement reason.
What magnetization information is needed for Bonded neodymium disc magnets?
Specify the magnetization axis or pole pattern, pole count where applicable, and the acceptance method. A field value must also state the measurement location, fixture or air gap so supplier and buyer evaluate the same condition.
How does temperature affect Bonded neodymium disc magnets?
Temperature capability depends on material grade, geometry, magnetizing state and the magnetic circuit. Provide temperature, corrosion medium, mechanical retention and magnetic circuit; GX can then review demagnetization risk and whether the proposed material route fits the duty.
How should magnetic performance be verified for Bonded neodymium disc magnets?
Use an agreed method tied to the application: material-property testing, surface field at a defined position, flux, pull force, pole pattern or waveform. The released drawing and acceptance plan should state the instrument, fixture and limits.
What information should an RFQ for Bonded neodymium disc magnets include?
Send the drawing or 3D model, material or magnetic target, diameter, thickness, flatness, edge condition and magnetization direction, temperature, corrosion medium, mechanical retention and magnetic circuit, expected quantity and acceptance method. State whether tooling, inserts, assembly or magnetization is included in the requested supply scope.
How are samples approved before recurring Bonded neodymium disc magnets orders?
Agree the drawing revision, tooling state, critical dimensions and magnetic test method before sample release. Approval should identify the sample record and any deviations; recurring orders then follow the released specification, quotation and control plan.
Request for quotation
Request a Quote for Custom Bonded Neodymium Disc Magnets
Include the application, 2D/3D drawing, magnetic target and test condition, operating environment, mating interfaces, sample quantity and annual demand.
- Critical dimensions, tolerances and datums
- Magnetization direction, pole map and working gap
- Insert, shaft, hub, carrier or adhesive relationship
- Temperature, moisture, chemicals, speed and validation cycle