OSENC manufactures custom sintered NdFeB tube magnets to your drawing, with controlled OD, ID, length, coating and magnetization for shaft, sensor, motor and cylindrical assembly designs.
Our current manufacturing range covers OD 1.5–60 mm, ID 0.4–50 mm and lengths from 0.3–120 mm. Send us your OD × ID × H, pole direction and operating conditions, and we will review the complete geometry before quotation.
A tube magnet looks simple until the bore, wall, coating and magnetic circuit all have to work in the same assembly. We control the part as one finished component rather than treating each specification in isolation.
We manufacture the OD, bore and overall length as one finished geometry, including the effect of coating on critical fit dimensions.
We review ID, wall thickness and length together because a geometry that works on a short ring may not remain practical on a long tube.
We match pole direction to the real magnetic circuit rather than selecting magnetization from the tube shape alone.
We define dimensional, coating and magnetic inspection around the acceptance requirements on your drawing.
| Gegenstand | OSENC Tube Magnet Supply | What to Put on the RFQ |
|---|---|---|
| Werkstoff | Gesintertes NdFeB | Grade or magnetic target |
| Geometrie | Elongated cylindrical magnet with a straight through bore | OD × ID × H |
| OD | 1.5–60 mm | Finished OD and fit requirement |
| ID | 0.4–50 mm | Finished bore requirement after coating |
| Länge | 0,3–120 mm | Overall finished length |
| Magnetgüten | N35–N55 plus temperature-grade families reviewed by application | Betriebstemperatur |
| Magnetisierung | Drawing-controlled | Pole direction, sensor position or magnetic working faces |
| Beschichtung | Nickel, zinc, epoxy and Parylene-based options | Environment and finished fit |
Use a neodymium tube magnet when your design needs a cylindrical NdFeB magnet with a through bore for a shaft, sleeve, guide, cable, fastener or internal assembly clearance.
Compared with a solid cylinder, the bore creates a repeatable mechanical interface. Compared with a short ring, the longer body gives you more axial length for the assembly. The design succeeds when we control the bore, wall geometry, pole direction and actual working gap together.
For OSENC tube magnets, use D = outer diameter, d = inner diameter und H = overall height / length.
Beispiel: D10 × d7 × H30 mm means 10 mm OD, 7 mm ID and 30 mm overall length.
For a straight-bore tube, nominal radial wall thickness is (D − d) / 2. We do not judge manufacturability from wall thickness alone. We review OD, ID, length, grade, grinding allowance, coating and edge condition as one part.
If the tube runs on a shaft or works near a sensor, put the critical fit, concentricity or runout requirement directly on the drawing.
| Parameter | OSENC Range | Engineering Focus |
|---|---|---|
| Outer diameter | 1.5–60 mm | Finished OD, handling and magnetic circuit |
| Inner diameter | 0.4–50 mm | Bore fit, wall thickness and coating build |
| Height / length | 0,3–120 mm | Long thin-wall geometry and handling risk |
| Magnetic-direction dimension | Up to 120 mm | Pole direction fixed on the approved drawing |
Theoretical OD, ID and H ranges cannot be combined arbitrarily. Long tubes, small bores and thin walls increase machining, edge and handling difficulty. Send the complete OD × ID × H combination and we will review the geometry before the production drawing is released.
We select magnetization from the working magnetic circuit, not from tube shape alone. Show us the shaft, sensor position, air gap, mating steel or target field direction on your drawing.
We use axial magnetization when the main magnetic field needs to work through the two annular end faces.
We use diametrical magnetization when the field needs to act across the cylindrical body, including suitable rotating and sensing designs.
For radial or multipole requirements, we review OD/ID ratio, axial length, grade and tooling before quotation.
OSENC can review N35–N55 and temperature-grade families including M, H, SH, EH and AH for custom tube magnets.
We select the grade together with OD, ID, wall thickness, operating temperature and the required magnetic circuit. A higher grade is not automatically the better choice if the geometry or temperature requirement points to another solution.
Send us the operating temperature and magnetic target. We will match the grade to the finished part rather than treating grade as an isolated specification.
OSENC offers nickel, zinc, epoxy und Parylene-based coating options for custom neodymium magnets.
For a tube magnet, coating selection affects more than corrosion resistance. Coating build changes the finished OD, finished ID and actual assembly clearance.
If the bore fits over a shaft or sleeve, specify the required finished ID after coating. We use the finished dimension on the approved drawing as the production target.
For epoxy-coated custom magnets, OSENC's confirmed epoxy coating thickness range is 15–40 μm. We confirm whether the requested Tube geometry and finished tolerance are suitable before production release.
For motor and shaft-mounted designs, we review bore fit, rotor geometry, pole direction, air gap and operating temperature together.
For sensing applications, send us the sensor location, reading direction and working air gap. We review the tube geometry and magnetization around the detection position.
For actuator designs, we match the tube magnet to the rod, guide, travel direction and magnetic circuit.
We use through-bore geometry when the magnet needs to fit around a shaft, sleeve, cable, guide or internal component that a solid cylinder would block.
Your drawing defines what matters. We build the inspection plan around the dimensions and magnetic characteristics that control your assembly.
| Prüfung | Was wir prüfen | Warum das wichtig ist |
|---|---|---|
| OD / ID / H | Finished dimensions after processing and coating | Shaft fit and assembly clearance |
| Bore & Edge | Bore condition, chipping and edge damage | Thin-wall reliability and assembly protection |
| Beschichtung | Coverage, surface condition and specified thickness | Corrosion protection and finished fit |
| Polrichtung | Magnetization orientation | Correct magnetic circuit |
| Gauss Test | Defined measurement point, orientation and distance | Repeatable magnetic acceptance |
| Special Geometry | Concentricity or runout when specified | Rotating or close-gap assemblies |
A Gauss value is meaningful only when magnet size, grade, pole direction, probe position, probe orientation and working distance are fixed. If your project has a magnetic acceptance requirement, send us the measurement point and working gap so we can define the test condition before production.
A complete drawing is best, but you can start with OD × ID × H and the application.
You do not need a perfect production drawing to start the discussion. Send us the size, application and magnetic working direction you already know.
We will review the tube geometry, grade, coating, magnetization and inspection requirements as one finished part before quotation and sampling.
Send Your Tube Magnet Requirement| Produkt | What It Is | Geeignet für | Main RFQ Inputs |
|---|---|---|---|
| Neodymium magnet tube | Elongated sintered NdFeB part with a straight through bore. | Shafts, sensors, motors, actuators and cylindrical OEM assemblies. | OD, ID, H, grade, magnetization, coating, tolerance, quantity. |
| Neodymium ring magnet | Shorter through-hole NdFeB geometry, often washer-like. | Compact rotors, speakers, sensors, couplings and mounting. | OD, ID, thickness, magnetization, coating. |
| Magnetic filter tube / rod | Magnetic-separation component with a protective stainless-steel structure around an internal magnetic circuit. | Removing ferrous contamination from product flow. | Tube diameter, length, working gap, process material, temperature, cleaning method. |
A neodymium magnet tube is an elongated tube-shaped sintered NdFeB permanent magnet with a straight through bore. OSENC manufactures the geometry to drawing for shaft, sensing, motor and custom cylindrical assembly requirements.
Our current Tube range is OD 1.5–60 mm, ID 0.4–50 mm and H 0.3–120 mm, with a maximum magnetic-direction dimension of 120 mm. We review the complete OD × ID × H combination before production release.
Use D × d × H, where D is OD, d is ID and H is overall length. For example, D10 × d7 × H30 mm means 10 mm OD, 7 mm ID and 30 mm length.
We review long and thin-wall tube geometries, but feasibility depends on the complete OD × ID × H combination, grade, coating and edge condition. Send the full geometry rather than checking wall thickness alone.
Yes. If ID is a critical fit dimension, specify the finished bore requirement on the drawing. We review coating together with the finished dimensional requirement.
Show the required north/south pole direction, sensor position or magnetic working faces. If the magnetic circuit is not yet fixed, send us the assembly layout and we can review the suitable magnetization direction with you.
No. We match magnetization to the real magnetic circuit. Axial and diametrical arrangements are used for suitable through-hole designs, while radial or multipole requirements receive a geometry and tooling review before quotation.
OSENC coating options for custom neodymium magnets include nickel, zinc, epoxy and Parylene-based systems. For Tube projects, we select the coating together with corrosion exposure and the required finished OD/ID fit.
Yes. Sample validation is the right stage to confirm fit, finished dimensions, coating, pole direction and any agreed magnetic test before repeat production.
We manufacture neodymium tube magnets as finished engineered parts. Send the geometry, application, magnetization direction, coating, operating temperature and quantity, and we will review the complete part for quotation.
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