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MW 20x35 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010043

GTIN/EAN: 5906301810421

5.00

Diameter Ø

20 mm [±0,1 mm]

Height

35 mm [±0,1 mm]

Weight

82.47 g

Magnetization Direction

↑ axial

Load capacity

9.58 kg / 93.97 N

Magnetic Induction

595.77 mT / 5958 Gs

Coating

[NiCuNi] Nickel

49.52 with VAT / pcs + price for transport

40.26 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 20x35 / N38 - cylindrical magnet

Specification / characteristics - MW 20x35 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010043
GTIN/EAN 5906301810421
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 20 mm [±0,1 mm]
Height 35 mm [±0,1 mm]
Weight 82.47 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.58 kg / 93.97 N
Magnetic Induction ~ ? 595.77 mT / 5958 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 20x35 / 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

Physical analysis of the product - technical parameters

These information represent the outcome of a physical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ. Use these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs gap) - interaction chart
MW 20x35 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5955 Gs
595.5 mT
9.58 kg / 21.12 pounds
9580.0 g / 94.0 N
strong
1 mm 5357 Gs
535.7 mT
7.75 kg / 17.09 pounds
7751.3 g / 76.0 N
strong
2 mm 4769 Gs
476.9 mT
6.14 kg / 13.55 pounds
6144.2 g / 60.3 N
strong
3 mm 4214 Gs
421.4 mT
4.80 kg / 10.58 pounds
4797.3 g / 47.1 N
strong
5 mm 3242 Gs
324.2 mT
2.84 kg / 6.26 pounds
2839.3 g / 27.9 N
strong
10 mm 1668 Gs
166.8 mT
0.75 kg / 1.66 pounds
751.8 g / 7.4 N
safe
15 mm 921 Gs
92.1 mT
0.23 kg / 0.51 pounds
229.1 g / 2.2 N
safe
20 mm 555 Gs
55.5 mT
0.08 kg / 0.18 pounds
83.1 g / 0.8 N
safe
30 mm 246 Gs
24.6 mT
0.02 kg / 0.04 pounds
16.4 g / 0.2 N
safe
50 mm 78 Gs
7.8 mT
0.00 kg / 0.00 pounds
1.6 g / 0.0 N
safe

Table 2: Vertical hold (wall)
MW 20x35 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.92 kg / 4.22 pounds
1916.0 g / 18.8 N
1 mm Stal (~0.2) 1.55 kg / 3.42 pounds
1550.0 g / 15.2 N
2 mm Stal (~0.2) 1.23 kg / 2.71 pounds
1228.0 g / 12.0 N
3 mm Stal (~0.2) 0.96 kg / 2.12 pounds
960.0 g / 9.4 N
5 mm Stal (~0.2) 0.57 kg / 1.25 pounds
568.0 g / 5.6 N
10 mm Stal (~0.2) 0.15 kg / 0.33 pounds
150.0 g / 1.5 N
15 mm Stal (~0.2) 0.05 kg / 0.10 pounds
46.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.04 pounds
16.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - vertical pull
MW 20x35 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.87 kg / 6.34 pounds
2874.0 g / 28.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.92 kg / 4.22 pounds
1916.0 g / 18.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.96 kg / 2.11 pounds
958.0 g / 9.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.79 kg / 10.56 pounds
4790.0 g / 47.0 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 20x35 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.96 kg / 2.11 pounds
958.0 g / 9.4 N
1 mm
25%
2.40 kg / 5.28 pounds
2395.0 g / 23.5 N
2 mm
50%
4.79 kg / 10.56 pounds
4790.0 g / 47.0 N
3 mm
75%
7.19 kg / 15.84 pounds
7185.0 g / 70.5 N
5 mm
100%
9.58 kg / 21.12 pounds
9580.0 g / 94.0 N
10 mm
100%
9.58 kg / 21.12 pounds
9580.0 g / 94.0 N
11 mm
100%
9.58 kg / 21.12 pounds
9580.0 g / 94.0 N
12 mm
100%
9.58 kg / 21.12 pounds
9580.0 g / 94.0 N

Table 5: Thermal stability (stability) - thermal limit
MW 20x35 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.58 kg / 21.12 pounds
9580.0 g / 94.0 N
OK
40 °C -2.2% 9.37 kg / 20.66 pounds
9369.2 g / 91.9 N
OK
60 °C -4.4% 9.16 kg / 20.19 pounds
9158.5 g / 89.8 N
OK
80 °C -6.6% 8.95 kg / 19.73 pounds
8947.7 g / 87.8 N
100 °C -28.8% 6.82 kg / 15.04 pounds
6821.0 g / 66.9 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 20x35 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 68.69 kg / 151.44 pounds
6 132 Gs
10.30 kg / 22.72 pounds
10304 g / 101.1 N
N/A
1 mm 62.01 kg / 136.70 pounds
11 316 Gs
9.30 kg / 20.50 pounds
9301 g / 91.2 N
55.81 kg / 123.03 pounds
~0 Gs
2 mm 55.58 kg / 122.53 pounds
10 714 Gs
8.34 kg / 18.38 pounds
8337 g / 81.8 N
50.02 kg / 110.28 pounds
~0 Gs
3 mm 49.59 kg / 109.32 pounds
10 120 Gs
7.44 kg / 16.40 pounds
7438 g / 73.0 N
44.63 kg / 98.39 pounds
~0 Gs
5 mm 38.99 kg / 85.96 pounds
8 974 Gs
5.85 kg / 12.89 pounds
5849 g / 57.4 N
35.09 kg / 77.37 pounds
~0 Gs
10 mm 20.36 kg / 44.88 pounds
6 484 Gs
3.05 kg / 6.73 pounds
3054 g / 30.0 N
18.32 kg / 40.40 pounds
~0 Gs
20 mm 5.39 kg / 11.88 pounds
3 337 Gs
0.81 kg / 1.78 pounds
809 g / 7.9 N
4.85 kg / 10.70 pounds
~0 Gs
50 mm 0.25 kg / 0.55 pounds
718 Gs
0.04 kg / 0.08 pounds
37 g / 0.4 N
0.22 kg / 0.50 pounds
~0 Gs
60 mm 0.12 kg / 0.26 pounds
492 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
0.11 kg / 0.23 pounds
~0 Gs
70 mm 0.06 kg / 0.13 pounds
352 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
0.05 kg / 0.12 pounds
~0 Gs
80 mm 0.03 kg / 0.07 pounds
261 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
0.03 kg / 0.07 pounds
~0 Gs
90 mm 0.02 kg / 0.04 pounds
200 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.04 pounds
~0 Gs
100 mm 0.01 kg / 0.03 pounds
156 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
0.01 kg / 0.02 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - precautionary measures
MW 20x35 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 15.0 cm
Hearing aid 10 Gs (1.0 mT) 11.5 cm
Timepiece 20 Gs (2.0 mT) 9.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.0 cm
Car key 50 Gs (5.0 mT) 6.5 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm

Table 8: Impact energy (cracking risk) - warning
MW 20x35 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 11.39 km/h
(3.16 m/s)
0.41 J
30 mm 18.85 km/h
(5.24 m/s)
1.13 J
50 mm 24.31 km/h
(6.75 m/s)
1.88 J
100 mm 34.37 km/h
(9.55 m/s)
3.76 J

Table 9: Coating parameters (durability)
MW 20x35 / 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 20x35 / N38

Parameter Value SI Unit / Description
Magnetic Flux 20 408 Mx 204.1 µWb
Pc Coefficient 1.16 High (Stable)

Table 11: Hydrostatics and buoyancy
MW 20x35 / N38

Environment Effective steel pull Effect
Air (land) 9.58 kg Standard
Water (riverbed) 10.97 kg
(+1.39 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

*Caution: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Heat tolerance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.16

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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 specification and ecology
Elemental analysis
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%
Environmental data
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: 010043-2026
Magnet Unit Converter
Magnet pull force

Magnetic Induction

Other products

The presented product is an extremely powerful rod magnet, composed of durable NdFeB material, which, at dimensions of Ø20x35 mm, guarantees maximum efficiency. The MW 20x35 / N38 component is characterized by an accuracy of ±0.1mm and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 9.58 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 93.97 N with a weight of only 82.47 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 20.1 mm) using two-component epoxy glues. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need the strongest magnets in the same volume (Ø20x35), 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 20 mm and height 35 mm. The value of 93.97 N means that the magnet is capable of holding a weight many times exceeding its own mass of 82.47 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 20 mm. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized through the diameter if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Pros

Besides their immense pulling force, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They feature excellent resistance to weakening of magnetic properties when exposed to external fields,
  • In other words, due to the aesthetic layer of nickel, the element looks attractive,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to freedom in forming and the ability to customize to client solutions,
  • Fundamental importance in high-tech industry – they are commonly used in hard drives, motor assemblies, advanced medical instruments, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in miniature devices

Limitations

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • Neodymium magnets decrease their force 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
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small components of these products are able to be problematic in diagnostics medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

Holding force of 9.58 kg is a result of laboratory testing performed under the following configuration:
  • on a block made of mild steel, effectively closing the magnetic flux
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with a surface perfectly flat
  • under conditions of gap-free contact (surface-to-surface)
  • under axial force direction (90-degree angle)
  • in stable room temperature

What influences lifting capacity in practice

During everyday use, the actual lifting capacity is determined by several key aspects, listed from the most important:
  • Distance – the presence of any layer (paint, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Steel grade – the best choice is pure iron steel. Hardened steels may attract less.
  • Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Demagnetization risk

Keep cool. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Eye protection

NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets will cause them shattering into small pieces.

Conscious usage

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Pacemakers

Warning for patients: Powerful magnets disrupt medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

Crushing force

Pinching hazard: The pulling power is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Mechanical processing

Machining of neodymium magnets poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Electronic hazard

Very strong magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

No play value

Product intended for adults. Small elements pose a choking risk, causing serious injuries. Keep out of reach of children and animals.

Warning for allergy sufferers

Some people have a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Extended handling can result in a rash. It is best to use safety gloves.

Phone sensors

A powerful magnetic field negatively affects the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to avoid damaging the sensors.

Caution! Need more info? Check our post: Why are neodymium magnets dangerous?