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MW 3x1 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010063

GTIN/EAN: 5906301810629

5.00

Diameter Ø

3 mm [±0,1 mm]

Height

1 mm [±0,1 mm]

Weight

0.05 g

Magnetization Direction

↑ axial

Load capacity

0.21 kg / 2.10 N

Magnetic Induction

342.82 mT / 3428 Gs

Coating

[NiCuNi] Nickel

0.1353 with VAT / pcs + price for transport

0.1100 ZŁ net + 23% VAT / pcs

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Product card - MW 3x1 / N38 - cylindrical magnet

Specification / characteristics - MW 3x1 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010063
GTIN/EAN 5906301810629
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 3 mm [±0,1 mm]
Height 1 mm [±0,1 mm]
Weight 0.05 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.21 kg / 2.10 N
Magnetic Induction ~ ? 342.82 mT / 3428 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 3x1 / N38 - cylindrical magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
coercivity bHc ? 10.8-11.5 kOe
coercivity bHc ? 860-915 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 36-38 BH max MGOe
energy density [min. - max.] ? 287-303 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅cm
Bending strength 250 MPa
Compressive strength 1000~1100 MPa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 10-6 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Engineering modeling of the assembly - technical parameters

These values represent the result of a engineering simulation. Values rely on algorithms for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static force (pull vs gap) - interaction chart
MW 3x1 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3422 Gs
342.2 mT
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
low risk
1 mm 1521 Gs
152.1 mT
0.04 kg / 0.09 LBS
41.5 g / 0.4 N
low risk
2 mm 585 Gs
58.5 mT
0.01 kg / 0.01 LBS
6.1 g / 0.1 N
low risk
3 mm 260 Gs
26.0 mT
0.00 kg / 0.00 LBS
1.2 g / 0.0 N
low risk
5 mm 76 Gs
7.6 mT
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
low risk
10 mm 12 Gs
1.2 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
15 mm 4 Gs
0.4 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
20 mm 2 Gs
0.2 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
30 mm 0 Gs
0.0 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
50 mm 0 Gs
0.0 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk

Table 2: Sliding capacity (wall)
MW 3x1 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.04 kg / 0.09 LBS
42.0 g / 0.4 N
1 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
2 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
3 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MW 3x1 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.06 kg / 0.14 LBS
63.0 g / 0.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.04 kg / 0.09 LBS
42.0 g / 0.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.02 kg / 0.05 LBS
21.0 g / 0.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.11 kg / 0.23 LBS
105.0 g / 1.0 N

Table 4: Material efficiency (substrate influence) - power losses
MW 3x1 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.02 kg / 0.05 LBS
21.0 g / 0.2 N
1 mm
25%
0.05 kg / 0.12 LBS
52.5 g / 0.5 N
2 mm
50%
0.11 kg / 0.23 LBS
105.0 g / 1.0 N
3 mm
75%
0.16 kg / 0.35 LBS
157.5 g / 1.5 N
5 mm
100%
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
10 mm
100%
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
11 mm
100%
0.21 kg / 0.46 LBS
210.0 g / 2.1 N
12 mm
100%
0.21 kg / 0.46 LBS
210.0 g / 2.1 N

Table 5: Thermal stability (stability) - power drop
MW 3x1 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.21 kg / 0.46 LBS
210.0 g / 2.1 N
OK
40 °C -2.2% 0.21 kg / 0.45 LBS
205.4 g / 2.0 N
OK
60 °C -4.4% 0.20 kg / 0.44 LBS
200.8 g / 2.0 N
80 °C -6.6% 0.20 kg / 0.43 LBS
196.1 g / 1.9 N
100 °C -28.8% 0.15 kg / 0.33 LBS
149.5 g / 1.5 N

Table 6: Two magnets (repulsion) - field collision
MW 3x1 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 0.51 kg / 1.12 LBS
4 928 Gs
0.08 kg / 0.17 LBS
77 g / 0.8 N
N/A
1 mm 0.26 kg / 0.56 LBS
4 847 Gs
0.04 kg / 0.08 LBS
38 g / 0.4 N
0.23 kg / 0.51 LBS
~0 Gs
2 mm 0.10 kg / 0.22 LBS
3 042 Gs
0.02 kg / 0.03 LBS
15 g / 0.1 N
0.09 kg / 0.20 LBS
~0 Gs
3 mm 0.04 kg / 0.08 LBS
1 865 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
0.03 kg / 0.08 LBS
~0 Gs
5 mm 0.01 kg / 0.01 LBS
764 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
10 mm 0.00 kg / 0.00 LBS
153 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
20 mm 0.00 kg / 0.00 LBS
23 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
2 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
1 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
1 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
0 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
0 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
0 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Safety (HSE) (implants) - warnings
MW 3x1 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 1.5 cm
Hearing aid 10 Gs (1.0 mT) 1.5 cm
Timepiece 20 Gs (2.0 mT) 1.0 cm
Mobile device 40 Gs (4.0 mT) 1.0 cm
Car key 50 Gs (5.0 mT) 1.0 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Collisions (kinetic energy) - collision effects
MW 3x1 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 65.36 km/h
(18.16 m/s)
0.01 J
30 mm 113.21 km/h
(31.45 m/s)
0.02 J
50 mm 146.15 km/h
(40.60 m/s)
0.04 J
100 mm 206.68 km/h
(57.41 m/s)
0.08 J

Table 9: Coating parameters (durability)
MW 3x1 / N38

Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)

Table 10: Construction data (Flux)
MW 3x1 / N38

Parameter Value SI Unit / Description
Magnetic Flux 257 Mx 2.6 µWb
Pc Coefficient 0.44 Low (Flat)

Table 11: Submerged application
MW 3x1 / N38

Environment Effective steel pull Effect
Air (land) 0.21 kg Standard
Water (riverbed) 0.24 kg
(+0.03 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

*Warning: On a vertical surface, the magnet retains only a fraction of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Power loss vs temp

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.44

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical and environmental data
Material specification
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Ecology and recycling (GPSR)
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 010063-2026
Measurement Calculator
Magnet pull force

Field Strength

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The offered product is an extremely powerful rod magnet, composed of advanced NdFeB material, which, at dimensions of Ø3x1 mm, guarantees the highest energy density. This specific item boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 0.21 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 2.10 N with a weight of only 0.05 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 3.1 mm) using epoxy glues. To ensure long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for 90% of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø3x1), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 3 mm and height 1 mm. The value of 2.10 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.05 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 1 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized through the diameter if your project requires it.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even over around ten years – the reduction in strength is only ~1% (according to tests),
  • They feature excellent resistance to magnetism drop when exposed to external fields,
  • A magnet with a metallic silver surface has an effective appearance,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
  • Thanks to versatility in shaping and the capacity to customize to complex applications,
  • Significant place in future technologies – they are commonly used in hard drives, motor assemblies, medical devices, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in producing threads and complicated forms in magnets, we propose using cover - magnetic mechanism.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Due to expensive raw materials, their price is relatively high,

Lifting parameters

Best holding force of the magnet in ideal parameterswhat contributes to it?

The lifting capacity listed is a result of laboratory testing performed under standard conditions:
  • on a base made of mild steel, optimally conducting the magnetic flux
  • with a cross-section minimum 10 mm
  • with an ideally smooth touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction perpendicular to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Real force impacted by working environment parameters, mainly (from priority):
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Metal type – not every steel reacts the same. High carbon content worsen the attraction effect.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Avoid contact if allergic

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction appears, cease working with magnets and use protective gear.

Dust is flammable

Drilling and cutting of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Warning for heart patients

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Danger to the youngest

NdFeB magnets are not toys. Accidental ingestion of multiple magnets may result in them pinching intestinal walls, which poses a critical condition and requires immediate surgery.

Magnetic interference

A powerful magnetic field interferes with the operation of magnetometers in smartphones and navigation systems. Keep magnets near a smartphone to avoid breaking the sensors.

Demagnetization risk

Avoid heat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Magnetic media

Data protection: Neodymium magnets can damage data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Bodily injuries

Protect your hands. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!

Immense force

Be careful. Neodymium magnets act from a long distance and connect with huge force, often faster than you can react.

Beware of splinters

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Important! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98