MW 20x35 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010043
GTIN/EAN: 5906301810421
- Diameter Ø
- 20 mm [±0,1 mm]
- Height
- 35 mm [±0,1 mm]
- Weight
- 82.47 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
49.52 zł with VAT / pcs + price for transport
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Need more?Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical of the product - MW 20x35 / N38 - cylindrical magnet
Specification / characteristics - MW 20x35 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010043 |
| GTIN/EAN | 5906301810421 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 analysis of the magnet - data
Presented values constitute the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide when designing systems.
Table 1: Static force (pull vs distance) - characteristics
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
|
weak grip |
| 15 mm |
921 Gs
92.1 mT
|
0.23 kg / 0.51 LBS
229.1 g / 2.2 N
|
weak grip |
| 20 mm |
555 Gs
55.5 mT
|
0.08 kg / 0.18 LBS
83.1 g / 0.8 N
|
weak grip |
| 30 mm |
246 Gs
24.6 mT
|
0.02 kg / 0.04 LBS
16.4 g / 0.2 N
|
weak grip |
| 50 mm |
78 Gs
7.8 mT
|
0.00 kg / 0.00 LBS
1.6 g / 0.0 N
|
weak grip |
Table 2: Sliding hold (vertical surface)
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 (shearing) - 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 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 (saturation) - sheet metal selection
MW 20x35 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.96 kg / 2.11 LBS
958.0 g / 9.4 N
|
| 1 mm |
|
2.40 kg / 5.28 LBS
2395.0 g / 23.5 N
|
| 2 mm |
|
4.79 kg / 10.56 LBS
4790.0 g / 47.0 N
|
| 3 mm |
|
7.19 kg / 15.84 LBS
7185.0 g / 70.5 N
|
| 5 mm |
|
9.58 kg / 21.12 LBS
9580.0 g / 94.0 N
|
| 10 mm |
|
9.58 kg / 21.12 LBS
9580.0 g / 94.0 N
|
| 11 mm |
|
9.58 kg / 21.12 LBS
9580.0 g / 94.0 N
|
| 12 mm |
|
9.58 kg / 21.12 LBS
9580.0 g / 94.0 N
|
Table 5: Thermal stability (stability) - 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) - field collision
MW 20x35 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral 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: Hazards (implants) - warnings
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 |
| Mobile device | 40 Gs (4.0 mT) | 7.0 cm |
| Remote | 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 |
10.58 km/h
(2.94 m/s)
|
0.36 J | |
| 30 mm |
11.05 km/h
(3.07 m/s)
|
0.39 J | |
| 50 mm |
11.07 km/h
(3.07 m/s)
|
0.39 J | |
| 100 mm |
11.07 km/h
(3.07 m/s)
|
0.39 J |
Table 9: Anti-corrosion coating 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: Physics of underwater searching
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% |
1. Vertical hold
*Caution: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Heat tolerance
*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) = 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.
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 |
Other offers
Advantages as well as disadvantages of Nd2Fe14B magnets.
Advantages
- Their magnetic field is durable, and after around ten years it decreases only by ~1% (according to research),
- They maintain their magnetic properties even under external field action,
- In other words, due to the shiny finish of nickel, the element gains visual value,
- Magnets are characterized by maximum magnetic induction on the outer side,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Thanks to flexibility in constructing and the ability to customize to specific needs,
- Significant place in high-tech industry – they are commonly used in computer drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions
Weaknesses
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
- 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
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
- Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
- Due to neodymium price, their price is higher than average,
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- on a block made of structural steel, effectively closing the magnetic field
- whose transverse dimension reaches at least 10 mm
- with a surface cleaned and smooth
- without the slightest clearance between the magnet and steel
- under axial force direction (90-degree angle)
- at standard ambient temperature
Lifting capacity in real conditions – factors
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
- Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
- Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
- Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.
Precautions when working with neodymium magnets
Pinching danger
Protect your hands. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!
Shattering risk
Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.
Compass and GPS
A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.
Dust is flammable
Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.
Product not for children
These products are not toys. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.
Warning for allergy sufferers
Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.
Handling guide
Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.
Health Danger
Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
Maximum temperature
Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).
Safe distance
Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.
