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
Load capacity
9.58 kg / 93.97 N
Magnetic Induction
595.77 mT / 5958 Gs
Coating
[NiCuNi] Nickel
49.52 ZŁ with VAT / pcs + price for transport
40.26 ZŁ net + 23% VAT / pcs
bulk discounts:
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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 |
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 |
|
0.96 kg / 2.11 pounds
958.0 g / 9.4 N
|
| 1 mm |
|
2.40 kg / 5.28 pounds
2395.0 g / 23.5 N
|
| 2 mm |
|
4.79 kg / 10.56 pounds
4790.0 g / 47.0 N
|
| 3 mm |
|
7.19 kg / 15.84 pounds
7185.0 g / 70.5 N
|
| 5 mm |
|
9.58 kg / 21.12 pounds
9580.0 g / 94.0 N
|
| 10 mm |
|
9.58 kg / 21.12 pounds
9580.0 g / 94.0 N
|
| 11 mm |
|
9.58 kg / 21.12 pounds
9580.0 g / 94.0 N
|
| 12 mm |
|
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% |
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.
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 products
Strengths as well as weaknesses of neodymium magnets.
Pros
- 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
- 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?
- 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
- 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.
