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Cylinder NdFeB Magnets
Cylinder NdFeB Magnets
Cylinder NdFeB Magnets
Cylinder NdFeB Magnets
Cylinder NdFeB Magnets
Cylinder NdFeB Magnets
Cylinder NdFeB Magnets
Cylinder NdFeB Magnets
Cylinder NdFeB Magnets

Cylinder NdFeB Magnets

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Description

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Product Overview
 

Cylinder NdFeB Magnets

 

Cylinder NdFeB Magnets, also known as cylindrical neodymium magnets, are a type of high-performance permanent magnet with a cylindrical (round bar) shape. They are made of neodymium, iron, boron and other rare earth materials, featuring high magnetic energy product, strong coercivity, compact structure and easy installation. Due to their regular cylindrical shape, they can be easily assembled into various devices, widely used in multiple industries that require stable magnetic performance and space-saving design. Below are their typical application scenarios, consistent with professional expression standards.

Ningbo Vanguard Technologies supplies cylinder magnets across the full grade family — from standard N-grade through M, H, SH, UH, and EH high-temperature series — enabling precise performance matching for each motor operating environment. All pieces undergo full magnetic testing, dimensional inspection, and salt-spray or HAST corrosion evaluation before shipment.

Whether you need a standard catalogue geometry or a fully custom cylinder profile, Vanguard can provide sample shipment within 10–15 days and mass-production support for rotor assembly or bare-magnet supply.

Quick View

Cylinder NdFeB Magnet Selection Snapshot

 
N35-N55
Available Grade Range
From high-output standard grades to high-coercivity sensor and motor grades.
80-200 °C
Working Temperature Range
N, M, H, SH, UH and EH series can be selected by thermal condition.
Axial / Dia.
Magnetization Options
Axial, diametrical, radial and multi-pole magnetization can be customized.
10-15 Days
Prototype Sample Lead Time
Fast sampling after diameter, length, coating and polarity confirmation.
Temperature Grade Guide
N Series
 
80 °C
M Series
 
100 °C
H Series
 
120 °C
SH Series
 
150 °C
UH / EH
 
180-200 °C
Application Demand Focus
Sensors
 
Polarity
Electronics
 
Compact
Automotive
 
High Hcj
Medical
 
Clean Surface
Fixtures
 
Holding
1Drawing ReviewDiameter, length, chamfer
2Grade MatchBr, Hcj, temperature margin
3Coating PlanNiCuNi, epoxy, Zn, custom
4MagnetizationAxial, diametrical, multi-pole
5InspectionFlux, size, coating, polarity
Industries Served
 

Key Applications

 
Consumer electronics
Miniature cylindrical magnets for earphones, smart wearables, camera modules and small appliances; compact size and stable magnetic force support sensing, positioning and acoustic components.
sensors & detectors
Precision cylinder magnets for Hall sensors, proximity switches and magnetic encoders; controlled diameter and magnetization improve repeatable position, speed and distance detection.
automotive components
High-coercivity cylinder magnets for automotive sensors, door locks, pumps and small auxiliary motors requiring thermal stability, vibration resistance and reliable coating protection.
medical equipment
Tightly controlled cylindrical magnets for medical pumps, diagnostic accessories and surgical instruments where dimensional consistency, clean surfaces and stable flux are required.
industrial automation
Standard and custom cylinders for linear actuators, compact motors, reed switches and magnetic fixtures requiring easy installation and repeatable holding force.
Magnetic fixation
High-strength cylinder magnets for embedded holding, magnetic clamping and assembly positioning in machinery, electronics, fixtures and hardware products.
Magnetic Performance
 

Grade & Magnetic Properties

 

Standard grades for cylindrical NdFeB magnets. All values at 20 °C. Values are typical; exact grade selection is confirmed per application.

Grade Remanence Coercivity Intrinsic Coercivity Max. Energy Product Temp. Coefficient (α) Max. Working
Temperature
°C (L/D=0.7)
Br Hcb Hcj (BH)max αBr
(%/°C)		 αHcj
(%/°C)
T kGs kA/m kOe kA/m kOe kJ/m³ MGOe
N30 1.08–1.13 10.8–11.3 ≥798 ≥10.0 ≥955 ≥12 223–247 28–31 −0.12 −0.76 80
N33 1.13–1.17 11.3–11.7 ≥836 ≥10.5 ≥955 ≥12 247–271 31–34 −0.12 −0.76 80
N35 1.17–1.22 11.7–12.2 ≥868 ≥10.9 ≥955 ≥12 263–287 33–36 −0.12 −0.76 80
N38 1.22–1.25 12.2–12.5 ≥899 ≥11.3 ≥955 ≥12 287–310 36–39 −0.12 −0.76 80
N40 1.25–1.28 12.5–12.8 ≥907 ≥11.4 ≥955 ≥12 302–326 38–41 −0.12 −0.76 80
N42 1.28–1.32 12.8–13.2 ≥915 ≥11.5 ≥955 ≥12 318–342 40–43 −0.12 −0.76 80
N45 1.32–1.38 13.2–13.8 ≥923 ≥11.6 ≥955 ≥12 342–366 43–46 −0.12 −0.76 80
N48 1.38–1.42 13.8–14.2 ≥923 ≥11.6 ≥955 ≥12 366–390 46–49 −0.12 −0.76 80
N50 1.40–1.45 14.0–14.5 ≥796 ≥10.0 ≥876 ≥11 382–406 48–51 −0.12 −0.76 80
N52 1.43–1.48 14.3–14.8 ≥796 ≥10.0 ≥876 ≥11 398–422 50–53 −0.12 −0.76 80
N55 1.46–1.52 14.6–15.2 ≥796 ≥10.0 ≥876 ≥11 414–430 52–54 −0.12 −0.76 80
N35M 1.17–1.22 11.7–12.2 ≥868 ≥10.9 ≥1114 ≥14 263–287 33–36 −0.12 −0.68 100
N38M 1.22–1.25 12.2–12.5 ≥899 ≥11.3 ≥1114 ≥14 287–310 36–39 −0.12 −0.68 100
N40M 1.25–1.28 12.5–12.8 ≥923 ≥11.6 ≥1114 ≥14 302–326 38–41 −0.12 −0.68 100
N42M 1.28–1.32 12.8–13.2 ≥955 ≥12.0 ≥1114 ≥14 318–342 40–43 −0.12 −0.68 100
N45M 1.32–1.38 13.2–13.8 ≥995 ≥12.5 ≥1114 ≥14 342–366 43–46 −0.12 −0.68 100
N48M 1.37–1.43 13.7–14.3 ≥1027 ≥12.9 ≥1114 ≥14 366–390 46–49 −0.12 −0.68 100
N50M 1.40–1.45 14.0–14.5 ≥1033 ≥13.0 ≥1114 ≥14 382–406 48–51 −0.12 −0.68 100
N52M 1.43–1.48 14.3–14.8 ≥1050 ≥13.2 ≥1114 ≥14 398–422 50–53 −0.12 −0.68 100
N54M 1.45–1.50 14.5–15.0 ≥1051 ≥13.2 ≥1114 ≥14 414–438 52–55 −0.12 −0.68 100
N35H 1.17–1.22 11.7–12.2 ≥868 ≥10.9 ≥1353 ≥17 263–287 33–36 −0.12 −0.66 120
N38H 1.22–1.25 12.2–12.5 ≥899 ≥11.3 ≥1353 ≥17 287–310 36–39 −0.12 −0.66 120
N40H 1.25–1.28 12.5–12.8 ≥923 ≥11.6 ≥1353 ≥17 302–326 38–41 −0.12 −0.66 120
N42H 1.28–1.32 12.8–13.2 ≥955 ≥12.0 ≥1353 ≥17 318–342 40–43 −0.12 −0.66 120
N45H 1.32–1.36 13.2–13.6 ≥963 ≥12.1 ≥1353 ≥17 342–366 43–46 −0.12 −0.66 120
N48H 1.37–1.43 13.7–14.3 ≥995 ≥12.5 ≥1353 ≥17 366–390 46–49 −0.12 −0.66 120
N50H 1.40–1.45 14.0–14.5 ≥1011 ≥12.7 ≥1353 ≥17 382–406 48–51 −0.12 −0.66 120
N52H 1.43–1.48 14.3–14.8 ≥1027 ≥12.9 ≥1353 ≥17 398–422 50–53 −0.12 −0.66 120
N35SH 1.17–1.22 11.7–12.2 ≥876 ≥11.0 ≥1592 ≥20 263–287 33–36 −0.11 −0.56 150
N38SH 1.22–1.25 12.2–12.5 ≥907 ≥11.4 ≥1592 ≥20 287–310 36–39 −0.11 −0.56 150
N40SH 1.25–1.28 12.5–12.8 ≥939 ≥11.8 ≥1592 ≥20 302–326 38–41 −0.11 −0.56 150
N42SH 1.28–1.32 12.8–13.2 ≥987 ≥12.4 ≥1592 ≥20 318–342 40–43 −0.11 −0.56 150
N45SH 1.32–1.38 13.2–13.8 ≥1003 ≥12.6 ≥1592 ≥20 342–366 43–46 −0.11 −0.56 150
N48SH 1.37–1.43 13.7–14.3 ≥1027 ≥12.9 ≥1592 ≥20 366–390 46–49 −0.11 −0.56 150
N50SH 1.40–1.45 14.0–14.5 ≥1003 ≥12.6 ≥1592 ≥20 382–406 48–51 −0.11 −0.56 150
N30UH 1.08–1.13 10.8–11.3 ≥812 ≥10.2 ≥1990 ≥25 223–247 28–31 −0.10 −0.50 180
N33UH 1.13–1.17 11.3–11.7 ≥852 ≥10.7 ≥1990 ≥25 247–271 31–34 −0.10 −0.50 180
N35UH 1.17–1.22 11.7–12.2 ≥860 ≥10.8 ≥1990 ≥25 263–287 33–36 −0.10 −0.50 180
N38UH 1.22–1.25 12.2–12.5 ≥876 ≥11.0 ≥1990 ≥25 287–310 36–39 −0.10 −0.50 180
N40UH 1.25–1.28 12.5–12.8 ≥899 ≥11.3 ≥1990 ≥25 302–326 38–41 −0.10 −0.50 180
N42UH 1.28–1.32 12.8–13.2 ≥899 ≥11.3 ≥1990 ≥25 318–342 40–43 −0.10 −0.50 180
N45UH 1.32–1.36 13.2–13.6 ≥908 ≥11.4 ≥1990 ≥25 342–366 43–46 −0.10 −0.50 180
N48UH 1.37–1.43 13.7–14.3 ≥908 ≥11.4 ≥1990 ≥25 366–390 46–49 −0.10 −0.50 180
N28EH 1.04–1.08 10.4–10.8 ≥780 ≥9.8 ≥2388 ≥30 207–231 26–29 −0.10 −0.45 200
N30EH 1.08–1.13 10.8–11.3 ≥812 ≥10.2 ≥2388 ≥30 223–247 28–31 −0.10 −0.45 200
N33EH 1.13–1.17 11.3–11.7 ≥836 ≥10.5 ≥2388 ≥30 247–271 31–34 −0.10 −0.45 200
N35EH 1.17–1.22 11.7–12.2 ≥876 ≥11.0 ≥2388 ≥30 263–287 33–36 −0.10 −0.45 200
N38EH 1.22–1.25 12.2–12.5 ≥899 ≥11.3 ≥2388 ≥30 287–310 36–39 −0.10 −0.45 200
N40EH 1.25–1.28 12.5–12.8 ≥899 ≥11.3 ≥2388 ≥30 302–326 38–41 −0.10 −0.45 200
N42EH 1.28–1.32 12.8–13.2 ≥899 ≥11.3 ≥2388 ≥30 318–342 40–43 −0.10 −0.45 200
N45EH 1.32–1.36 13.2–13.6 ≥899 ≥11.3 ≥2388 ≥30 342–366 43–46 −0.10 −0.45 200
N28AH 1.04–1.08 10.4–10.8 ≥787 ≥9.9 ≥2786 ≥35 207–231 26–29 −0.10 −0.45 230
N30AH 1.08–1.13 10.8–11.3 ≥819 ≥10.3 ≥2786 ≥35 223–247 28–31 −0.10 −0.45 230
N33AH 1.13–1.17 11.3–11.7 ≥843 ≥10.6 ≥2786 ≥35 247–271 31–34 −0.10 −0.45 230
N35AH 1.17–1.22 11.7–12.2 ≥876 ≥11.0 ≥2786 ≥35 263–287 33–36 −0.10 −0.45 230
N38AH 1.22–1.25 12.2–12.5 ≥899 ≥11.3 ≥2786 ≥35 287–310 36–39 −0.10 −0.45 230
Typical Physical Properties (All Sintered NdFeB Grades)
 
Parameter Unit Reference Value Parameter Unit Reference Value
Curie Temperature °C 310 ~ 400 Thermal Conductivity W/m·°C 8 ~ 10
Density g/cm³ 7.4 ~ 7.7 Young's Modulus GPa 150 ~ 200
Vickers Hardness HV 500 ~ 700 Electrical Resistivity (C∥) μΩ·m 1.4 ~ 1.6
Recoil Permeability — 1.02 ~ 1.08 Electrical Resistivity (C⊥) μΩ·m 1.2 ~ 1.4
Compressive Strength MPa 1000 ~ 1100 Coeff. of Thermal Expansion (C∥) 10⁻⁶/°C 4 ~ 9
Flexural Strength MPa 150 ~ 400 Coeff. of Thermal Expansion (C⊥) 10⁻⁶/°C −2 ~ 0
Magnetization Orientations Available
Surface Treatment
 

Coating & Plating Options

 

NdFeB is susceptible to oxidation without adequate surface protection. Vanguard specifies and verifies the following coating systems per IEC 60068 and ASTM B117 salt-spray standards.

Coating Type
Thickness / Colour
Salt Spray · Tw
Ni·Cu·Ni Triple Layer
Industry standard for clean, low-humidity environments. Bright silver finish.
Most Popular
10–20 μm · Bright Silver
≥ 48 hr · ≤ 200 °C
Zinc (Zn)
Cost-effective general-purpose coating. Dark silver finish. Good for most industrial motors.
5–10 μm · Dark Silver
≥ 24 hr · ≤ 160 °C
Epoxy Resin
Best corrosion and humidity resistance. Charcoal grey. Recommended for EV motor environments.
EV Preferred
10–20 μm · Char Grey
≥ 72 hr · ≤ 120 °C
Ni·Cu + Epoxy
Triple-layer protection for high-humidity and aggressive environments.
12–25 μm · Matt Black
≥ 168 hr · ≤ 120 °C
Geometry & Tolerances
 

Dimension Capability

 

Cylinder magnets are defined by diameter (D) and axial length (L). Standard tolerance is ± 0.05 mm on all dimensions; tight-tolerance ± 0.03 mm is available on request. Chamfered edges, center holes, countersunk holes, stepped cylinders and special magnetization directions can be customized for assembly requirements.

Dimension Minimum Maximum Standard Tol.
Diameter (D) 0.2 mm 250 mm ± 0.05 mm
Axial Length (L) 0.1 mm 250 mm ± 0.05 mm
Engineering Selection
 

How to Specify Cylinder NdFeB Magnets

 

Cylinder magnets are commonly used where compact geometry, easy insertion and concentrated magnetic force are required. Vanguard reviews diameter, axial length, L/D ratio, magnetization direction, working temperature, coating and assembly method before confirming the final specification.

Diameter and L/D ratio: Short discs usually provide a broad contact area and compact holding force, while longer cylinders provide deeper magnetic reach and easier insertion into plastic, metal or machined housings.

Magnetization direction: Axial magnetization is the most common for discs and cylinders. Diametrical, radial, multi-pole and paired polarity options can be supplied for sensors, encoders, couplings and special magnetic assemblies.

Assembly reliability: Chamfer, edge radius, coating thickness, adhesive clearance and polarity marking should be confirmed together to reduce chipping, coating damage and assembly variation.

Custom Capability
 

Available Custom Features

 
Item Options Typical Purpose
Geometry Disc, cylinder, long rod, stepped cylinder, ring with center hole Fit sensors, motors, couplings, fixtures and embedded assemblies.
Edge Treatment Chamfer, radius, deburring, polished surface Reduce chipping during insertion, bonding and automated handling.
Magnetization Axial, diametrical, radial, multi-pole, matched flux set Support Hall sensors, encoders, couplings and magnetic holding systems.
Surface Protection NiCuNi, Zn, epoxy, NiCuNi + epoxy, phosphating Improve corrosion resistance according to humidity, salt spray and temperature.
Manufacturing Process
 

From Powder to Finished Cylinder Magnet

 

Production starts with rare-earth alloy preparation, hydrogen decrepitation, jet milling and magnetic-field alignment. The pressed blanks are vacuum sintered, aged, sliced or centerless-ground to final diameter and length, then coated, magnetized, inspected and packed according to the approved drawing.

For automated assembly, Vanguard can provide polarity marking, matched flux batches, anti-chip packing and clean surface finish suitable for bonding, insertion or press-fit installation.

Quality Assurance
 

Inspection & Validation

 

Magnetic testing: Br, Hcb, Hcj, (BH)max, surface flux, flux linkage, polarity and magnetization direction verification.

Dimensional control: Diameter, axial length, roundness, flatness, perpendicularity, chamfer and appearance inspection.

Coating verification: Thickness, adhesion, salt spray, humidity resistance and thermal shock testing according to coating type.

Documentation: Material certificate, inspection report, RoHS/REACH declaration and lot traceability records are available for shipment release.

Request a Quote
 

Information Needed for Fast Quotation

 

To speed up engineering review, please send a 2D/3D drawing or list the key specifications below. If your project is still in the design stage, Vanguard can help compare grade, coating and magnetization options before tooling.

  • Diameter, axial length, tolerance, chamfer, hole or step requirement
  • Material grade or target Br/Hcj, plus maximum working temperature
  • Magnetization direction, polarity marking and required surface flux if available
  • Coating type, salt-spray requirement, adhesive process and operating environment
  • Sample quantity, annual volume, packing requirement and target delivery schedule
Support
 

Frequently Asked Questions

 
How do I choose between M, H, SH, and UH grades for my motor?
Grade selection depends on the maximum winding temperature your motor will experience. M-grade (≤100 °C) suits most industrial servo applications; H-grade (≤120 °C) is standard for EV auxiliary motors; SH (≤150 °C) and UH (≤180 °C) are specified for EV traction drives and high-ambient industrial use. We recommend providing your thermal simulation data so we can confirm the correct grade.
What is the minimum order quantity for custom cylinder magnets?
For custom geometry, samples can be arranged from as few as 50–200 pieces. Mass-production MOQ is typically 1000–10000 pieces per specification, though this is flexible depending on magnet size and grade. Contact us to discuss your project volume.
Can you supply cylinder magnets already assembled into an assembly?
Yes. Vanguard provides integrated rotor assembly services — including magnet bonding, balancing, and shaft press-fitting — as part of our Magnetic Systems product line. We can supply bare cylinder magnets or complete sub-assemblies depending on your manufacturing flow.
Do you provide material certifications and test reports?
Full material certificates (chemical composition, magnetic test data, coating thickness, salt-spray results) are provided with each shipment as standard. ROHS, REACH, and conflict-mineral declarations are available on request.
What is the lead time for cylinder NdFeB magnets?
Prototype samples: 10–15 working days. Mass-production orders: 25–35 working days depending on grade, coating, and quantity. Rush sampling may be available — please inquire.
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