Sealed industrial pumps
Required torque, containment barrier, speed and operating temperature.
Magnetic Couplings — Torque Through Walls, Zero Leakage
Inner and outer magnet rings transmit torque through a sealed containment can — no shaft seal, no leak path, no contamination. For pumps and mixers handling hazardous, ultra-pure, or sterile fluids.
For Procurement
MOQ, lead time, packaging and commercial terms — go straight to a quotation.
Request a Quote →For Engineering
Grades, drawings, process data and design support for your DFM review.
Magnet Design Guide →For Quality / SQE
Certificates, inspection planning, traceability and PPAP / FAI support per project.
Certificates & Documentation →Product Range
Magnetic Couplings — Product Gallery
Representative product forms for reference. Final geometry, material and finish are agreed for each project.
Why Magnetic Couplings?
Every shaft seal is a leak path — a maintenance item and a contamination risk. Magnetic couplings eliminate the seal entirely.
- ✓Zero leakage — hermetic separation of drive and driven sides — nothing gets in, nothing gets out
- ✓No seal wear — no contact between driving and driven components — no friction, no wear items, no seal replacement
- ✓Overload protection — couplings decouple at a defined torque — built-in protection against jamming and overload damage
- ✓Custom torque curves — we tune magnet grade and geometry to give you the exact decoupling torque for your application
Applications
| Application | Typical Spec | Why This Material |
|---|---|---|
| Chemical Process Pumps | SmCo in Hastelloy can | Pumping acids, solvents, and toxics |
| Pharma Mixers | SmCo in 316L stainless can | Sterile mixing — zero contamination |
| Semiconductor Fluid Handling | SmCo in PEEK can | Ultra-pure chemicals, no metal ion contamination |
| Refrigeration Compressors | NdFeB in thin steel can | Hermetic compressor drive |
| Laboratory Reactors | SmCo in glass-lined can | Sealed reaction vessels |
Coupling Design Parameters
We design to your torque, speed, and fluid requirements.
| Parameter | Typical Range | Notes |
|---|---|---|
| Torque | 0.1–500 Nm | Custom designs; sintered NdFeB or SmCo |
| Speed | Up to 10,000 RPM | Higher with special balancing |
| Temperature | -40°C to 350°C | SmCo for >150°C; NdFeB below |
| Containment can | 316L, Hastelloy C, PEEK, glass | Material matched to fluid |
| Gap | 1–5mm typical | Smaller gap = more torque per volume |
| Decoupling torque | 1.3–2× rated torque | Protects against overload |
Synchronous vs Eddy-Current
Two coupling technologies for different requirements:
- ✓Synchronous (permanent magnet) — inner and outer rings lock magnetically and turn together — full torque up to the decoupling point; standard choice
- ✓Eddy-current (induction) — conducting cup (copper or aluminum) on one side generates torque via induced currents — provides soft-start and slip protection but at lower efficiency (90–95%)
Containment Can Selection
The can is the critical component — it must contain the fluid, survive the pressure, and not short out the magnetic field:
- ✓Metal cans (316L, Hastelloy) — pressure-resistant and chemically compatible, but eddy-current losses at high speed — use for moderate RPM or high pressure
- ✓Non-metallic cans (PEEK, ceramic) — zero eddy losses (higher efficiency) and excellent chemical resistance — pressure limits lower than metal
- ✓Can thickness — thinner = more torque but less pressure margin; we optimize thickness for your pressure and torque spec
Complete Technical Data
Full reference tables for Magnetic Couplings & Wheels — migrated from our production specification library. Click any row's PDF to download the grade datasheet.
Data table 1
| Part Number | D | d | W | b | h | Pull Force | Weight |
|---|---|---|---|---|---|---|---|
| EM-W-25 | 25 | 8 | 16 | 3 | 8.6 | 55 N | 0.054 kg |
| EM-W-32 | 32 | 10 | 18 | 4 | 11.1 | 80 N | 0.100 kg |
| EM-W-40 | 40 | 12 | 20 | 4 | 13.1 | 120 N | 0.200 kg |
| EM-W-50 | 50 | 16 | 25 | 5 | 17.3 | 200 N | 0.350 kg |
| EM-W-63 | 63 | 20 | 32 | 6 | 21.7 | 330 N | 0.700 kg |
| EM-W-80 | 80 | 25 | 40 | 8 | 26.7 | 630 N | 1.450 kg |
| EM-W-100 | 100 | 30 | 50 | 8 | 31.7 | 900 N | 2.800 kg |
| EM-W-125 | 125 | 40 | 62 | 12 | 42.1 | 1520 N | 5.350 kg |
Data table 2
| Part Number | R | L | W | H | W1 | H1 | R1 | M | W2 | L1 | Pull (0mm) | Pull (3mm) | Pull (5mm) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| EM-R-5040 | 50 | 40 | 76 | 36.5 | 42 | 12.5 | 26 | M4 | 64 | 18 | 490 N | 230 N | 150 N |
| EM-R-5060 | 50 | 60 | 76 | 36.5 | 42 | 12.5 | 26 | M4 | 64 | 38 | 820 N | 400 N | 260 N |
| EM-R-8040 | 80 | 40 | 115 | 51 | 76 | 20 | 49 | M5 | 102 | 18 | 730 N | 400 N | 300 N |
| EM-R-8060 | 80 | 60 | 115 | 51 | 76 | 20 | 49 | M5 | 102 | 38 | 1250 N | 730 N | 540 N |
| EM-R-10040 | 100 | 40 | 152 | 62 | 100 | 26 | 64 | M5 | 138 | 18 | 850 N | 480 N | 340 N |
| EM-R-10060 | 100 | 60 | 152 | 62 | 100 | 26 | 64 | M5 | 138 | 38 | 1500 N | 900 N | 650 N |
| EM-R-12040 | 120 | 40 | 172 | 70 | 120 | 30 | 80 | M5 | 158 | 18 | 1000 N | 600 N | 420 N |
| EM-R-12060 | 120 | 60 | 172 | 70 | 120 | 30 | 80 | M5 | 158 | 38 | 1750 N | 1100 N | 800 N |
| EM-R-15040 | 150 | 40 | 200 | 77 | 142 | 31 | 104 | M6 | 186 | 18 | 1200 N | 750 N | 560 N |
| EM-R-15060 | 150 | 60 | 200 | 77 | 142 | 31 | 104 | M6 | 186 | 38 | 2100 N | 1350 N | 1050 N |
Production & Supply Planning
Magnetic Couplings: A Defined Route to Repeat Orders
Agree the process, acceptance criteria and shipment plan before production starts. The quotation identifies the producing site and the controls required for your part.
Confirm the manufacturing route
Match the inner and outer magnetic circuits to the torque, gap, containment barrier and corrosion environment.
Approve the inspection plan
Specify torque at the operating gap, temperature and speed, together with dimensional and retention checks.
Qualify before repeat supply
Define sample approval, drawing revision and lot identification. Agree how material, process or site changes will be reviewed before implementation.
Plan releases and delivery
Confirm order quantities, capacity allocation, packaging and shipping terms against your forecast. Delivery dates and any buffer-stock arrangement belong in the agreed supply plan.
Application Engineering
Where magnetic couplings Fit
Typical component uses and the requirements to discuss before quotation. Suitability depends on your design and validation criteria.
Chemical processing equipment
Fluid compatibility, corrosion protection and isolation requirements.
Medical and laboratory fluid systems
Torque at operating gap, cleaning conditions and drive integration.
Energy and process systems
Starting torque, duty cycle and environmental sealing.
Frequently Asked Questions
What happens if the coupling decouples?
The driving side spins freely while the driven side stops. There's no mechanical damage — re-engage by slowing or stopping the drive and restarting. We design the decoupling torque at 1.3–2× rated torque so normal operating transients don't trigger decoupling.
How efficient are magnetic couplings?
Synchronous couplings with non-metallic cans are 99%+ efficient. Metal cans introduce eddy-current losses that increase with speed — at 3,000 RPM a 316L can might lose 5–10% of torque to heating. For high-speed applications, PEEK cans or laminated metal cans minimize losses.
Can you design the coupling for my existing pump?
Yes — send us your pump's torque requirement, shaft sizes, fluid, pressure, and temperature. We'll design a coupling retrofit with the decoupling torque, can material, and mounting interface specific to your application.
Do magnetic couplings need maintenance?
Essentially none. The bearings on each side see normal wear, but the magnetic coupling itself has no contact surfaces to wear. For sealed pump designs with magnetic bearings, the entire assembly can be maintenance-free for the pump's service life.
Coupling Verification
Torque Characterization
Breakaway and operating torque measured on every design; temperature derating curves supplied so you can size the coupling to your worst-case load.
Containment Integrity
Pressure and leak testing of containment cans to your spec — for pumps, mixers and hermetic drives.
Dynamic Balance
Rotating assemblies balanced to your G-grade requirement; concentricity of hubs verified for smooth high-speed operation.
Have an Assembly Drawing or BOM?
Send it to our team — we'll review the design and quote it as a validated, ready-to-install assembly.