Medical Device Magnets & OEM Sourcing

Medical-device magnet programs are usually defined by function at the working condition—not by grade alone. Radial Magnets supports OEMs, CDMOs and contract manufacturers with stocked and custom permanent-magnet sourcing, engineering support, traceability and production documentation for sensors, pumps, motors, actuators, encoders, couplings, retention systems and other non-contact mechanisms.

For medical and regulated programs, the critical inputs are typically magnetic field, force or torque at the working gap; magnetization direction; temperature; coating; dimensional tolerance; inspection method; traceability; and required compliance documentation.

Choose the fastest path: Search stocked magnets for an existing size, use the Magnet RFQ Builder for a drawing or custom requirement, or submit multiple part numbers through the Bulk Magnet RFQ.

Common Medical-Device Magnet Applications

• Hall, TMR and AMR sensors for position, proximity, speed and angle measurement
• Rotary encoders using axial, diametric or multipole magnetization
• Miniature motors and pumps where compact rotor flux and temperature margin matter
• Magnetic couplings for sealed pumps and isolated drive systems
• Actuators and latching mechanisms requiring controlled force or motion
• Surgical robotics and laboratory automation for positioning, retention and motion control
• Wearable and hearing-device assemblies using compact retention or alignment magnets

Engineer the Magnet Around the Working Condition

A successful medical-device magnet specification should define what the magnet must do in the actual assembly. For a sensor, that usually means magnetic flux density at a defined location and orientation. For a coupling, it may be torque across a barrier. For a retention system, it may be breakaway force under a specified geometry. For a motor, it may be rotor field, coercivity margin and performance over temperature.

Use the Sensor Magnet Design Guide for Hall, TMR and AMR applications, the Magnet Field Distance Calculator for preliminary field-versus-gap screening, and the Magnetic Coupling Torque Calculator for sealed-drive concepts.

Material, Grade and Temperature Selection

NdFeB is commonly selected when high magnetic output is needed from a compact package. The correct grade should be chosen around energy product, intrinsic coercivity, temperature, geometry and opposing-field exposure rather than simply selecting the highest N-number.

Higher-coercivity families such as H, SH, UH, EH and AH may be appropriate when elevated temperature or demagnetizing fields are significant. Ferrite or Alnico may also be considered where their cost, corrosion or temperature characteristics better fit the application.

Use the Neodymium Magnet Grade Chart, Heat-Resistant Magnet Guide and Magnet Material Comparison for engineering reference. Material availability should be confirmed before a production design is finalized.

Coatings, Encapsulation and Sterilization Exposure

Sintered neodymium normally requires corrosion protection. Nickel-copper-nickel is common, while epoxy and other coating systems may be evaluated for environments involving humidity, cleaning chemicals, adhesives, overmolding or repeated handling.

For medical-device programs, coating selection should be reviewed together with the complete assembly. Consider coating thickness, adhesive compatibility, sterilization exposure, corrosion environment, thermal cycling and whether the magnet will be encapsulated behind a housing or barrier.

Component material or coating documentation does not by itself establish finished-device biocompatibility or regulatory suitability. Device manufacturers should evaluate the complete finished assembly, exposure route and applicable regulatory requirements for their intended use.

Traceability & Documentation Support

• Lot-level traceability for qualified production orders
• Certificates of Conformance and material certifications
• RoHS, REACH, PFAS, Prop 65 and other available material-compliance declarations
• Conflict-minerals documentation where applicable
• Dimensional and magnetic inspection records for qualified programs
• Customer-specific inspection and acceptance criteria
• PPAP or similar approval documentation when required by the customer
• Change-control and packaging requirements defined by the program
• NDA support before detailed engineering discussions

Review our Quality & Compliance capabilities or go directly to the Magnet Compliance Document Center during supplier qualification.

What to Include on a Medical Magnet RFQ

• Drawing or nominal dimensions and tolerances
• Material and preferred grade, if known
• Magnetization direction, pole count and required pole orientation
• Required magnetic field, force or torque at a defined working condition
• Nominal and worst-case air gap or separation distance
• Continuous and peak operating temperature
• Coating, environmental and cleaning/sterilization exposure
• Dimensional and magnetic inspection method
• Traceability, COC, PPAP and compliance-document requirements
• Prototype quantity, annual volume and production schedule

For custom medical-device magnets, use the Magnet RFQ Builder and include the drawing plus the functional magnetic requirement whenever possible.

Medical Magnet Engineering Resources

• How Magnets Are Used in Medical Devices
• Sensor Magnets for Hall, TMR, AMR & Rotary Sensing
• Browse Sensor Magnets
• Magnets in Electric Motors
• Magnetic Couplings & Sealed Drives
• Magnet Field Distance Calculator
• Neodymium Grade & Temperature Chart
• Quality & Compliance
• Compliance Document Center
• Request a Medical Device Magnet Quote

Start a Medical Magnet Project

Existing size: Search Inventory. Custom drawing or new design: Build an RFQ. Multiple parts or recurring production demand: Submit a Bulk RFQ. Compliance or qualification paperwork: Review Compliance Documents.