Grade Selection
Balance remanence, intrinsic coercivity, temperature, shape factor, magnetic circuit and cost.
Cylinder Ferrite Magnets
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Ningbo Vanguard Technologies Co., Ltd
Cost-effective ceramic cylinders and rods for sensors, speakers, holders, magnetic separation and industrial assemblies.
Vanguard supports grade selection, cylindrical geometry, magnetization planning, sample development and production supply. Diameter, axial length, shape factor, pole direction and magnetic circuit are reviewed together.
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Selection Snapshot
Balance remanence, intrinsic coercivity, temperature, shape factor, magnetic circuit and cost.
Specify diameter, axial length, chamfers, flatness, roundness and any hole, slot or step.
Define axial, diametrical, radial or application-specific magnetization with a pole sketch.
Request bare cylinders, marked polarity sets, adhesive-backed parts or assembly support after review.
Geometry & Magnetization
State diameter, length, edge treatment and functional datums. Long rods, short discs, holes and steps require separate tooling, strength and grinding review.
Mark the required north and south faces, polarity identification and surface-flux measurement location. Shape alone does not define magnetization.
Engineering Selection
Length in the magnetization direction relative to diameter affects the load line and demagnetization margin. Review the actual magnetic circuit and temperature-dependent curves.
Flux and holding force depend on pole area, steel return path, air gap, mating surface and measurement fixture. Select the cylinder as part of the complete circuit.
Ferrite is hard and brittle. Add suitable chamfers, avoid point loads and do not assume a metal-like press fit or clamping method is acceptable.
Confirm that material orientation and magnetizing tooling support the required direction. Diametrical or special patterns need explicit feasibility review.
Magnetic Performance
Reference values at 20 °C from the existing Vanguard ferrite grade table. The approved material specification and agreed inspection criteria govern each order.
| Grade | Standard | Br mT | Br kG | Hcb kA/m | Hcb kOe | Hcj kA/m | Hcj kOe | BHmax kJ/m³ | BHmax MGOe |
|---|---|---|---|---|---|---|---|---|---|
| Y8T | Chinese | 200-235 | 2.0-2.35 | 125-160 | 1.57-2.01 | 210-280 | 2.64-3.52 | 6.5-9.5 | 0.8-1.2 |
| Y10T | Chinese | 200-235 | 2.0-2.35 | 128-160 | 1.61-2.01 | 210-280 | 2.64-3.52 | 6.4-9.6 | 0.8-1.2 |
| Y20 | Chinese | 320-380 | 3.2-3.8 | 135-190 | 1.70-2.39 | 140-195 | 1.76-2.45 | 18.0-22.0 | 2.3-2.8 |
| Y22H | Chinese | 310-360 | 3.1-3.6 | 220-250 | 2.76-3.14 | 280-320 | 3.52-4.02 | 20.0-24.0 | 2.5-3.0 |
| Y23 | Chinese | 320-370 | 3.2-3.7 | 170-190 | 2.14-2.39 | 190-230 | 2.39-2.89 | 20.0-25.5 | 2.5-3.2 |
| Y25 | Chinese | 360-400 | 3.6-4.0 | 135-170 | 1.70-2.14 | 140-200 | 1.76-2.51 | 22.5-28.0 | 2.8-3.5 |
| Y26H | Chinese | 360-390 | 3.6-3.9 | 220-250 | 2.76-3.14 | 225-255 | 2.83-3.20 | 23.0-28.0 | 2.9-3.5 |
| Y26H-1 | Chinese | 360-390 | 3.6-3.9 | 200-250 | 2.51-3.14 | 225-255 | 2.83-3.20 | 23.0-28.0 | 2.9-3.5 |
| Y26H-2 | Chinese | 360-380 | 3.6-3.8 | 263-288 | 3.30-3.62 | 318-350 | 4.00-4.40 | 24.0-28.0 | 3.0-3.5 |
| Y27H | Chinese | 370-400 | 3.7-4.0 | 205-250 | 2.58-3.14 | 210-255 | 2.64-3.20 | 25.0-29.0 | 3.1-3.6 |
| Y28 | Chinese | 370-400 | 3.7-4.0 | 175-210 | 2.20-2.64 | 180-220 | 2.26-2.76 | 26.0-30.0 | 3.3-3.8 |
| Y28H-1 | Chinese | 380-400 | 3.8-4.0 | 240-260 | 3.02-3.27 | 250-280 | 3.14-3.52 | 27.0-30.0 | 3.4-3.8 |
| Y28H-2 | Chinese | 360-380 | 3.3-3.8 | 271-295 | 3.41-3.71 | 382-405 | 4.80-5.09 | 26.0-30.0 | 3.3-3.8 |
| Y30 | Chinese | 370-400 | 3.7-4.0 | 175-210 | 2.20-2.64 | 180-220 | 2.26-2.76 | 26.0-30.0 | 3.3-3.8 |
| Y30BH | Chinese | 380-390 | 3.8-3.9 | 223-235 | 2.80-2.95 | 231-245 | 2.90-3.08 | 27.0-30.0 | 3.4-3.8 |
| Y30H-1 | Chinese | 380-400 | 3.8-4.0 | 230-275 | 2.89-3.46 | 235-290 | 2.95-3.64 | 27.0-32.0 | 3.4-4.0 |
| Y30H-2 | Chinese | 395-415 | 3.95-4.15 | 275-300 | 3.46-3.77 | 310-335 | 3.90-4.21 | 27.0-32.5 | 3.4-4.1 |
| Y32 | Chinese | 400-420 | 4.0-4.2 | 160-190 | 2.01-2.39 | 165-195 | 2.07-2.45 | 30.0-33.5 | 3.8-4.2 |
| Y32H-1 | Chinese | 400-420 | 4.0-4.2 | 190-230 | 2.39-2.89 | 230-250 | 2.89-3.14 | 31.5-35.0 | 4.0-4.4 |
| Y32H-2 | Chinese | 400-440 | 4.0-4.4 | 224-240 | 2.81-3.02 | 230-250 | 2.89-3.14 | 31.0-34.0 | 3.9-4.3 |
| Y33 | Chinese | 410-430 | 4.1-4.3 | 220-250 | 2.76-3.14 | 225-255 | 2.83-3.20 | 31.5-35.0 | 4.0-4.4 |
| Y33H | Chinese | 410-430 | 4.1-4.3 | 250-270 | 3.14-3.39 | 250-275 | 3.14-3.46 | 31.5-35.0 | 4.0-4.4 |
| Y34 | Chinese | 420-440 | 4.2-4.4 | 200-230 | 2.51-2.89 | 205-235 | 2.58-2.95 | 32.5-36.0 | 4.1-4.5 |
| Y35 | Chinese | 430-450 | 4.3-4.5 | 215-239 | 2.70-3.00 | 217-241 | 2.73-3.03 | 33.1-38.2 | 4.2-4.8 |
| Y36 | Chinese | 430-450 | 4.3-4.5 | 247-271 | 3.10-3.41 | 250-274 | 3.14-3.44 | 35.1-38.3 | 4.4-4.8 |
| Y38 | Chinese | 440-460 | 4.4-4.6 | 285-305 | 3.58-3.83 | 294-310 | 3.69-3.90 | 36.6-40.6 | 4.6-5.1 |
| Y40 | Chinese | 440-460 | 4.4-4.6 | 330-354 | 4.15-4.45 | 340-360 | 4.27-4.52 | 37.5-41.8 | 4.7-5.3 |
| C1 | American | 230 | 2.3 | 148 | 1.86 | 258 | 3.5 | 8.36 | 1.05 |
| C5 | American | 380 | 3.8 | 191 | 2.4 | 199 | 2.5 | 27 | 3.4 |
| C7 | American | 340 | 3.4 | 258 | 3.23 | 318 | 4.0 | 21.9 | 2.75 |
| C8 / C8A | American | 385 | 3.85 | 235 | 2.95 | 242 | 3.05 | 27.8 | 3.5 |
| C8B | American | 420 | 4.2 | 232 | 2.913 | 236 | 2.96 | 32.8 | 4.12 |
| C9 | American | 380 | 3.8 | 280 | 3.516 | 320 | 4.01 | 26.4 | 3.32 |
| C10 | American | 400 | 4.0 | 280 | 3.52 | 284 | 3.57 | 30.4 | 3.82 |
| C11 | American | 430 | 4.3 | 200 | 2.512 | 204 | 2.56 | 34.4 | 4.32 |
| C12 | American | 400 | 4.0 | 290 | 3.65 | 318 | 4.0 | 32 | 4.0 |
Grade selection: Compare values only under equivalent test conditions. Final performance also depends on material orientation, segment geometry, magnetization, motor air gap and the measurement method.
Material Reference
General reference values for sintered ferrite materials. These values describe the material family and are not part-specific acceptance limits unless separately agreed.
| Parameter | Unit | Typical Value |
|---|---|---|
| Density / ρ | g/cm³ | 4.9-5.1 |
| Vickers Hardness / HV | - | 400-700 |
| Compression Strength | N/mm² | 680-720 |
| Coefficient of Thermal Expansion / α | 10-6/°C | C⊥: 10; C∥: 15 |
| Electrical Resistivity / ρ | mΩ·cm | 1 × 1010 |
| Thermal Conductivity / k | W/(cm·°C) | 0.029 |
| Tensile Strength / σ | Pa | 34 × 106 |
| Modulus of Elasticity / λ | Pa | 1.8 × 1011 |
| Flexural Strength / σ | Pa | 62 × 106 |
| Compression Strength | Pa | 895 × 106 |
| Poisson's Ratio / ν | - | 0.28 |
Orientation notation: C∥ and C⊥ indicate directions parallel and perpendicular to the material orientation axis. Confirm test methods when a physical property is used as a design or acceptance requirement.
Drawing Definition
The ranges below are catalogue references from the existing page. Diameter and length cannot be selected independently; tooling, pressing direction, grade, shape factor, magnetization and grinding are reviewed together.
| Dimension | Reference Minimum | Reference Maximum | Drawing Requirement |
|---|---|---|---|
| Diameter (D) | 1 mm | 120 mm | Define roundness, pole face and inspection datum |
| Axial Length (L) | 1 mm | 150 mm | Review shape factor, pressing and grinding route |
| Chamfer / Edge | Optional | Custom | Define angle or size and acceptable edge chips |
Final tolerances are quoted by feature after geometry, tooling, sintering variation and inspection access are reviewed. Center holes, slots, flats, steps and unusually long rods require separate confirmation.
Custom Features
| Area | Options for Review | Engineering Focus |
|---|---|---|
| Geometry | Cylinder, rod, short disc, chamfer, center hole, step, slot and flat | Tooling, slenderness, strength, grinding and edge integrity |
| Magnetization | Axial, diametrical, radial, paired polarity and fixture-specific direction | Material orientation, pole faces and fixture feasibility |
| Finishing | OD and face grinding, chamfering, cleaning, marking and adhesive backing | Final fit, cleanliness, bonding and brittle-edge protection |
| Inspection | Grade properties, surface flux, pull force, dimensions and polarity | Defined probe, distance, steel target, fixture and acceptance limits |
Application Fit
Define polarity, trigger distance, orientation, temperature and tolerance stack for reed, Hall or proximity sensing.
Review steel target, contact area, coating, gap, pull direction and release method for the complete assembly.
Coordinate cylinder dimensions, steel circuit, voice-coil gap and required field with the acoustic design.
Use ferrite cylinders where corrosion resistance, stable supply and cost are important, while validating working distance and target material.
Production Support
Align powder preparation, material orientation, pressing and sintering with the approved grade and geometry.
Inspect diameter, axial length, roundness, end-face condition, chamfers and agreed chip limits from defined datums.
Confirm polarity, grade properties, surface flux or pull force under an agreed fixture and measurement setup.
Define polarity marking, magnetic sorting, lot identification, reports and packaging that protects brittle parts.
Project Workflow
Technical Questions
No. Axial magnetization is common, while diametrical, radial or special directions may be reviewed according to material orientation, size and fixture feasibility.
It influences the magnet operating point when length is measured in the magnetization direction. The complete magnetic circuit and temperature must still be considered.
Ferrite is brittle, so direct interference may cause cracking. Use a reviewed clearance, adhesive, housing or support method instead of assuming a metal-like press fit.
Define steel target, thickness, contact surface, gap, pull direction, fixture and temperature. Results from different test conditions cannot be compared directly.
Ferrite generally has good corrosion resistance and is commonly uncoated. Marking, coating or adhesive backing may still be used for assembly or identification.
Tooling, geometry, grade, orientation, magnetizing fixture, inspection and quantity determine the quotation. Share sample demand and annual forecast for review.
Send the drawing and application conditions for a cylinder ferrite magnet review.
