Ferrite Magnet
GX Magnet supplies sintered hard ferrite magnets for motor, pump, appliance and industrial OEM projects. Material system, orientation, dimensions, magnetic targets and magnetization are reviewed against the customer drawing before sample approval and production release.
GX manufactures drawing-defined ferrite magnets and motor components for appliance, automotive, pump and industrial motor applications.
Quote preparation
Send the controlled drawing and revision, material or magnetic targets, critical dimensions, datums and tolerances, magnetization direction or pole pattern, operating temperature and media, sample quantity, annual forecast and proposed acceptance method. GX uses these inputs to review manufacturability and define the sampling route.
Why choose us for your project · 01
GX uses air classification in coarse powder processing to achieve a narrower and more stable particle size distribution. With the same raw material, this delivers higher residual flux density, a better coercivity ratio, and a squarer demagnetization curve.
Why choose us for your project · 02
Most suppliers press 6-pole ferrite rings with round tooling, but uneven sintering shrinkage distorts the geometry and pole distribution. GX uses a hexagonal outer-profile tool that pre-compensates shrinkage, so the green part sinters into a near-perfect round ring with evenly balanced magnetic poles.
The tool uses a hexagonal outer profile with a round inner bore. The hexagonal shape is engineered to offset differential shrinkage across the six pole regions during sintering.
Due to 6-pole orientation, shrinkage rates differ across the ring during sintering. The hexagonal green compact contracts unevenly and emerges as a near-perfect round part — the intended result, not a defect.
The resulting 6-pole flux waveform is symmetric and balanced, with consistent flux density across all poles. This uniformity is why GX rings pass BSH 30,000-cycle thermal shock testing.
Why choose us for your project · 03
Our multi‑pole ring magnet workflow covers dry pressing, auto demolding, palletizing, buffering and high‑temperature sintering. Every step runs automatically without manual handling of green compacts, delivering stable dimensional & magnetic consistency for high‑volume OEM orders.
Product and supply scope
A hard ferrite magnet is a ceramic permanent magnet produced by pressing and sintering ferrite powder into rings, arcs, blocks, or other drawing-defined geometries. GX uses strontium ferrite for current programs; barium ferrite is considered only for established legacy designs or when explicitly specified in the customer drawing. Isotropic or anisotropic material is selected according to the required magnetization direction and magnetic output.
In OEM drawings and sourcing documents, the terms hard ferrite magnet, sintered ferrite magnet and ceramic ferrite magnet are commonly used for this material family. To evaluate a project, GX reviews the part geometry, material grade or magnetic target, magnetization direction and operating conditions before confirming manufacturability and the sampling route.
Selection criteria
Select the ferrite material system and grade by evaluating the operating temperature, corrosion exposure, component geometry, magnetic orientation, magnetization direction, working air gap and installed magnetic circuit together.
For Y30BH or another grade named in the customer drawing, provide the OD, ID, thickness, magnetization direction, finished-part magnetic target and operating environment. GX reviews grade availability and any proposed equivalent during technical evaluation. A material-grade designation alone does not guarantee the magnetic output of the finished part.
Specification inputs
Final values are controlled by the approved material specification, drawing and sample.
| Parameter | Available or reviewed scope | Buyer input | Approval basis |
|---|---|---|---|
| Material system | Strontium ferrite for current programs; barium ferrite by legacy or drawing-specific review | Application and material requirement | Approved material specification |
| Material grade | GX ferrite grade or reviewed drawing-specified grade | Grade and magnetic targets | Material data and sample results |
| Magnetic properties | Br, Hcb, Hcj and (BH)max reviewed as a property set | Required values, units and test condition | Agreed specification and inspection record |
| Orientation | Anisotropic or isotropic | Working direction and magnetic circuit | Drawing and magnetic review |
| Forms | Ring, round, arc/segment, block, bar and drawing-defined ferrite components | 2D/3D drawing and assembly interface | Drawing review |
| Dimensions and tolerances | Defined according to geometry, pressing and machining route | Critical dimensions, datums and fit | Approved drawing and sample inspection |
| Magnetization | Direction and pole pattern according to product structure | Direction, pole count and flux target | Approved magnetic sample |
| Operating condition | Reviewed for temperature, moisture, mechanical load and assembly method | Environmental profile and validation plan | Project-specific test agreement |
| GX grade | Br (Gs) | Hcb (Oe) | Hcj (Oe) | (BH)max (MGOe) |
|---|---|---|---|---|
| FSB | 4,200 ± 100 | 3,300 ± 150 | 3,350 ± 200 | 4.0 ± 0.2 |
| FB6N | 4,300 ± 100 | 3,300 ± 150 | 3,350 ± 200 | 4.4 ± 0.2 |
| FB7N | 4,400 ± 100 | 3,300 ± 150 | 3,350 ± 200 | 4.6 ± 0.2 |
| FB9N | 4,600 ± 100 | 3,500 ± 200 | 3,600 ± 200 | 5.1 ± 0.2 |
| FB12B | 4,650 ± 100 | 4,300 ± 200 | 4,850 ± 200 | 5.2 ± 0.2 |
| FB13B | 4,750 ± 100 | 4,300 ± 200 | 4,850 ± 200 | 5.3 ± 0.2 |
Published material data supports initial grade selection; finished-part output also depends on geometry, orientation, magnetization, measurement condition and the installed magnetic circuit. Final values are treated as supply commitments only after they are confirmed in the released drawing, approved specification, quotation and acceptance plan.
Send the assembly drawing together with the magnetic target, measurement point, working air gap and operating-temperature profile.
Process route
The approved drawing, material specification and magnetic sample define the control points.
Material formulation supports the required pressing and magnetic response.
The part is formed; anisotropic orientation follows the magnetic design.
The compact is sintered with dimensional change controlled for later machining.
Critical faces and dimensions are finished against drawing datums.
Direction and pole configuration follow the approved magnetic design.
Dimensions, appearance and magnetic characteristics are checked before shipment.
Inspection planning
Inspection items are selected by component geometry and application risk. A ring magnet, arc segment and block magnet do not use an identical dimensional or magnetic control plan.
| Inspection item | Control approach | Project relevance |
|---|---|---|
| Dimensions and geometry | Inspection against drawing dimensions, datums and agreed tolerances | Assembly fit, air gap and bonding position |
| Magnetic properties | Br, Hcb, Hcj and (BH)max or agreed magnetic parameters | Material and batch verification |
| Magnetization | Direction, pole pattern and flux response checked against the approved requirement | Torque, sensing or magnetic-circuit function |
| Appearance and edge condition | Visual inspection against the agreed acceptance criteria | Handling, bonding and assembly protection |
| Environmental validation | Thermal shock or hot/cold water cycling when specified by the project | Appliance, pump and temperature-changing environments |
Application review
Product form and grade are selected according to the assembly interface, working air gap, magnetic target, operating environment and validation method.
For multipole pump rings, provide the OD, ID, length, bore interface, pole count and working air gap. Sample approval checks dimensions, concentricity, polarity and flux or waveform. Hot/cold-water programs must also define cycle conditions and post-test limits.
For ferrite arcs, define the stator bore, arc angle, thickness, bonding gap, air gap and operating temperature. Approval checks critical dimensions, polarity and magnetic output at the specified measurement position, together with the agreed temperature or durability tests.
Select rings, arcs or blocks according to the motor structure and mounting method. Define the installation envelope, air gap, pole count, magnetization direction and magnetic target. Validate fit, pole position and magnetic output using the agreed fixture and air gap.
Motor magnets require the stator bore, magnet dimensions, air gap and operating temperature. Speaker rings require the OD, ID, thickness, magnetic-circuit interfaces and target gap flux density. Each application needs its own measurement position and acceptance limits.
Verified project evidence
A related dishwasher ferrite ring program required the magnetic component to remain suitable through repeated hot- and cold-water operating conditions.
Documented evidence
Certificate and test-report scopes are identified by the certified activity, submitted sample, screening scope and recorded result. For production programs, drawing-defined inspection and agreed lot-release records provide the applicable acceptance basis.
Zhenjiang GX Magnet Co., Ltd. is certified under IATF 16949 for the manufacture of permanent ferrite components. Certificate T-16254/0 identifies manufacturing as the approved quality-management scope.
SGS report SHAEC26018965201 records a Pass result for the submitted Fe₂O₃ magnet sample within the stated EU RoHS screening scope.
SGS report SHAEC26018965202 records a Pass result for the submitted ferrite magnet sample within the specified screening scope covering 253 SVHC and one potential SVHC.
Engineering FAQ
These questions address material comparison, ferrite type, magnetic orientation, temperature exposure, surface condition, quotation inputs and the approval records needed before recurring OEM production.
Hard ferrite magnets retain a permanent magnetic field, while soft ferrite cores are designed to carry changing magnetic flux in electronic components.
This page covers sintered permanent ferrite magnets for motors, pumps, sensors and related assemblies. It does not cover soft ferrite cores.
Ferrite generally provides lower magnetic output per unit volume but offers good corrosion resistance, temperature stability and cost control.
Neodymium may reduce magnet volume where higher energy density is required. Selection should be based on the magnetic circuit, available space, air gap, demagnetization risk, operating environment and total assembly cost.
GX normally develops new hard-ferrite programs around strontium ferrite; barium ferrite should be treated as a legacy or drawing-specific requirement.
Do not substitute between the two without reviewing the released material specification, regulatory requirements, magnetic targets and validation plan.
Anisotropic ferrite is oriented during manufacture for higher performance in a preferred direction; isotropic ferrite allows more magnetization flexibility at lower magnetic output.
The choice affects tooling, magnetization direction and achievable circuit performance, so it should be fixed before sample manufacture.
State the minimum and maximum temperatures, exposure duration and whether the condition is continuous, intermittent or cyclic.
The acceptable range depends on grade, geometry, magnetic circuit, load line and demagnetization margin. Final limits should be confirmed through the released specification and application validation rather than a universal catalogue value.
Ferrite magnets usually do not need a corrosion-protection coating, but surface treatment may still be required for cleanliness, appearance, bonding or media-contact conditions.
Specify the fluid, humidity, dust, adhesive and handling requirements so the surface condition can be included in the drawing and acceptance plan.
Dimensions alone are not sufficient for an OEM quotation.
Provide the controlled drawing and revision, material or magnetic targets, magnetization direction, critical tolerances, assembly interface, operating temperature and media, forecast quantity and proposed acceptance method.
Approval normally links the released drawing to an agreed inspection and sample-validation plan.
Define dimensional, material and magnetic acceptance criteria, the measurement method and fixture, first-article or sample quantity, application tests and the records required for recurring lots.
Industry presence
GX exhibited magnetic materials and motor-related components at booth A671, Hall 8, from May 27–29, 2026.
Project inquiry
Attach the drawing and project requirements. GX reviews material, orientation, process and inspection before sample approval; the approved specification then controls production release.
