Product
Neodymium Ring Magnets
Ring NdFeB magnets engineered for shafts, couplings, and precision encoder systems.
Published on 2026/02/13
Last updated on 2026/02/13
Highlights
- Through-hole geometry optimized for shaft, bushing, and coupling interfaces
- Axial, radial, or multipole magnetization options confirmed per drawing
- Runout, coating, and balance constraints reviewed for rotating assemblies
Product Gallery
Ring magnets for motors
Overview
Ring magnets are commonly specified for shaft-mounted systems where concentricity, magnetization direction, and coating durability affect assembly stability. Share OD, ID, thickness, grade, magnetization target, and operating temperature so suppliers can confirm feasibility before RFQ.
Specifications
| Shape | Ring |
| Magnetization | Axial/radial on request |
| Grades | N35-N52; high-temp grades on request |
| Dimensions | Custom per drawing |
| Coatings | Ni-Cu-Ni, Zinc, Epoxy, Gold (on request) |
| Tolerance | Typical +/-0.05 mm (confirm per drawing) |
| MOQ | Available on request |
Applications
- Motors and generators
- Magnetic couplings
- Encoders and sensors
- Drive systems
- Precision instruments
- Rotary actuators
Customization Options
- Inner and outer diameter control per drawing
- Radial magnetization on request
- Coating selection based on environment
- Assembly pairing and packaging
- Polarity marking or orientation on request
Sourcing Support
- RFQ essentials: OD, ID, thickness, grade target, magnetization pattern, coating, quantity, and operating temperature profile.
- We confirm radial/multipole feasibility, segment options, and tolerances before prototype release.
- Assembly requirements such as shaft fit, polarity orientation, and packaging sequence are aligned early to reduce rework.
Compliance Notes
- RoHS/REACH declarations, CoA, and material traceability records can be coordinated on request.
- Dimensional, magnetic, and concentricity inspection reports are available for incoming QC plans.
- Packaging labels can include pole orientation, lot numbers, and assembly-line kitting identifiers.
Lead Time Notes
- Lead time depends on grade, coating, tolerance class, and magnetization complexity; confirmed after drawing review.
- Prototype and pilot batches are available subject to tooling readiness and supplier capacity.
- Expedite options can be evaluated for urgent launch timelines after technical feasibility confirmation.
Need a quote-ready specification review?
Share your drawing, grade target, coating, and quantity. We align supplier feasibility before full RFQ submission.
RFQ Checklist
- Drawing or dimensions with tolerances
- Target grade/strength and operating temperature
- Coating requirements and environment conditions
- Quantity, MOQ, and annual demand
- Application context and magnetization direction
Reference Guides
Procurement-ready guides covering grades, coatings, QC, and RFQ prep.
Materials & Grades
Choosing magnet shapes: bar, block, disc, ring
Match magnet shapes to assemblies, pull force needs, and manufacturability.
Magnetization & Design
Magnetization directions: axial, radial, diametral
How magnetization direction affects performance, assembly, and supplier feasibility.
FAQ
What magnetization direction should I specify?
Specify axial, diametral, or radial based on your assembly. Suppliers confirm feasibility per drawing.
What tolerances are typical?
Typical dimensional tolerance for sintered NdFeB is around +/-0.05 mm, subject to supplier confirmation.
Can you advise on coatings?
Ni-Cu-Ni is common. Zinc and epoxy are available on request. We confirm the best option with suppliers.
Do you support radial magnetization?
Radial magnetization can be requested for ring magnets. Provide OD, ID, and thickness for review.
Is there a minimum wall thickness?
Minimum wall thickness depends on size and grade. Share drawings so suppliers can confirm.
Case studies
HVAC - Linear actuator assemblies
Block Magnets for HVAC Linear Actuator Production Line
Scaling from 500 to 10,000 pcs/month of N35 block magnets for HVAC damper actuators while reducing unit cost by 18%.
Subsea / Marine - Magnetic coupling for ROV thrusters
Magnetic Assembly for Underwater ROV Thruster Coupling
Custom magnetic coupling assembly using N42 NdFeB ring magnets with epoxy coating for subsea ROV thruster applications.
Quote Calculator
Estimate lead time and prepare a precise RFQ.
Buyer feedback
Recent RFQ and sourcing coordination highlights.
The RFQ response included grade and coating options with clear lead times.
Marcus Reed
Procurement Manager - EV Motor OEM
Drawing review was fast and the quote matched our tolerance targets.
Ana Soto
Sourcing Lead - Industrial Automation
Inspection data and material declarations were available when requested.
Ravi Menon
Quality Engineer - Appliance Supplier
Trusted by buyer segments
OEM and industrial teams sourcing NdFeB and SmCo magnets.
Request a Quote
RFQ checklist
- Dimensions and shape (include drawing if possible).
- Grade and operating temperature range.
- Coating or surface treatment requirements.
- Quantity, target price, and delivery schedule.
- Tolerance, magnetization direction, and application notes.
Spec sheet downloads
Reference assets to speed up RFQ prep. Confirm specs before ordering.
NdFeB spec sheet (reference)
Grades, coatings, and RFQ checklist for NdFeB magnets.
SmCo spec sheet (reference)
High-temperature SmCo summary and RFQ checklist.
Ferrite spec sheet (reference)
Cost-optimized ferrite basics and RFQ checklist.
Alnico spec sheet (reference)
High-temperature Alnico grades and RFQ checklist.
Bonded NdFeB spec sheet (reference)
Bonded NdFeB process notes and RFQ checklist.
Flexible rubber magnet spec sheet (reference)
Flexible magnet tape basics and RFQ checklist.
Magnetic assembly spec sheet (reference)
Pot magnet assembly fundamentals and RFQ checklist.
Trust & Compliance
Certifications and QC checkpoints aligned to industrial procurement.
ISO 9001
Quality management system
RoHS
Restricted substances compliance
REACH
SVHC compliance on request
Factory Capability
- Custom shapes and grades per drawing
- Tolerances confirmed by supplier QC
- Coating options: Ni-Cu-Ni, Zinc, Epoxy
QC Process
- Raw material verification and grade checks
- Dimensional inspection to critical tolerances
- Surface and coating integrity inspection
Get a Quote
Send your drawing, grade, coating, and quantity. We coordinate a supplier quote and follow up with confirmed specs.
Product data is sourced from partner suppliers and confirmed per order.
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