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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 - 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

Technical modeling of the assembly - data

These data represent the result of a engineering calculation. Values are based on models for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these data as a preliminary roadmap during assembly planning.

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 LBS
9580.0 g / 94.0 N
strong
1 mm 5357 Gs
535.7 mT
7.75 kg / 17.09 LBS
7751.3 g / 76.0 N
strong
2 mm 4769 Gs
476.9 mT
6.14 kg / 13.55 LBS
6144.2 g / 60.3 N
strong
3 mm 4214 Gs
421.4 mT
4.80 kg / 10.58 LBS
4797.3 g / 47.1 N
strong
5 mm 3242 Gs
324.2 mT
2.84 kg / 6.26 LBS
2839.3 g / 27.9 N
strong
10 mm 1668 Gs
166.8 mT
0.75 kg / 1.66 LBS
751.8 g / 7.4 N
safe
15 mm 921 Gs
92.1 mT
0.23 kg / 0.51 LBS
229.1 g / 2.2 N
safe
20 mm 555 Gs
55.5 mT
0.08 kg / 0.18 LBS
83.1 g / 0.8 N
safe
30 mm 246 Gs
24.6 mT
0.02 kg / 0.04 LBS
16.4 g / 0.2 N
safe
50 mm 78 Gs
7.8 mT
0.00 kg / 0.00 LBS
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 LBS
1916.0 g / 18.8 N
1 mm Stal (~0.2) 1.55 kg / 3.42 LBS
1550.0 g / 15.2 N
2 mm Stal (~0.2) 1.23 kg / 2.71 LBS
1228.0 g / 12.0 N
3 mm Stal (~0.2) 0.96 kg / 2.12 LBS
960.0 g / 9.4 N
5 mm Stal (~0.2) 0.57 kg / 1.25 LBS
568.0 g / 5.6 N
10 mm Stal (~0.2) 0.15 kg / 0.33 LBS
150.0 g / 1.5 N
15 mm Stal (~0.2) 0.05 kg / 0.10 LBS
46.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.04 LBS
16.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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 LBS
2874.0 g / 28.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.92 kg / 4.22 LBS
1916.0 g / 18.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.96 kg / 2.11 LBS
958.0 g / 9.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.79 kg / 10.56 LBS
4790.0 g / 47.0 N

Table 4: Material efficiency (substrate influence) - power losses
MW 20x35 / N38

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

Table 5: Thermal stability (material behavior) - power drop
MW 20x35 / N38

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

Table 6: Two magnets (repulsion) - forces in the system
MW 20x35 / N38

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

Table 7: Protective zones (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
Mechanical watch 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 (kinetic energy) - 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: Submerged application
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

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

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly weakens the holding force.

3. Heat tolerance

*For standard magnets, the critical limit is 80°C.

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

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

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%
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
Measurement Calculator
Magnet pull force

Field Strength

Other products

The presented product is an exceptionally strong rod magnet, composed of durable NdFeB material, which, with dimensions of Ø20x35 mm, guarantees the highest energy density. The MW 20x35 / N38 component boasts high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 9.58 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 93.97 N with a weight of only 82.47 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure long-term durability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. 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.
This model is characterized by dimensions Ø20x35 mm, which, at a weight of 82.47 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 9.58 kg (force ~93.97 N), which, with such defined dimensions, proves the high grade of the NdFeB material. 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 35 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 and weaknesses of Nd2Fe14B magnets.

Advantages

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They do not lose magnetism, even over approximately 10 years – the reduction in power is only ~1% (based on measurements),
  • They retain their magnetic properties even under external field action,
  • In other words, due to the glossy layer of gold, the element gains visual value,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of individual machining as well as adjusting to concrete needs,
  • Fundamental importance in modern industrial fields – they are utilized in magnetic memories, brushless drives, precision medical tools, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in compact constructions

Weaknesses

Problematic aspects of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose 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
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of making nuts in the magnet and complicated shapes - recommended is cover - magnetic holder.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

Breakaway force is the result of a measurement for the most favorable conditions, including:
  • with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Bear in mind that the working load may be lower depending on elements below, in order of importance:
  • Distance (betwixt the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Material composition – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
  • Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate decreases the holding force.

Warnings
Do not overheat magnets

Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Combustion hazard

Machining of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Allergic reactions

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, immediately stop working with magnets and wear gloves.

Crushing force

Danger of trauma: The pulling power is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Material brittleness

Neodymium magnets are sintered ceramics, which means they are very brittle. Clashing of two magnets will cause them breaking into shards.

Medical interference

For implant holders: Strong magnetic fields disrupt medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Data carriers

Avoid bringing magnets close to a wallet, laptop, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Phone sensors

An intense magnetic field disrupts the operation of compasses in smartphones and GPS navigation. Keep magnets close to a device to avoid damaging the sensors.

Conscious usage

Exercise caution. Rare earth magnets attract from a long distance and snap with huge force, often quicker than you can react.

Do not give to children

Absolutely store magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are very dangerous.

Attention! Looking for details? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98