MW 55x25 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010081
GTIN/EAN: 5906301810803
- Diameter Ø
- 55 mm [±0,1 mm]
- Height
- 25 mm [±0,1 mm]
- Weight
- 445.47 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
125.37 zł net / pcs
154.21 zł with VAT (23% VAT) / pcs
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Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
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 parameters - MW 55x25 / N38 - cylindrical magnet
Specification / characteristics - MW 55x25 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010081 |
| GTIN/EAN | 5906301810803 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 55 mm [±0,1 mm] |
| Height | 25 mm [±0,1 mm] |
| Weight | 445.47 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 92.25 kg / 904.94 N |
| Magnetic Induction ~ ? | 416.97 mT / 4170 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| properties | values | units |
|---|---|---|
| Remanence Br ? | 12.2-12.6 | kGs |
| Remanence Br ? | 1220-1260 | mT |
| Coercivity bHc ? | 10.8-11.5 | kOe |
| Coercivity bHc ? | 860-915 | kA/m |
| Intrinsic coercivity iHc | ≥ 12 | kOe |
| Intrinsic coercivity iHc | ≥ 955 | kA/m |
| Energy product BHmax ? | 36-38 | BH max MGOe |
| Energy product BHmax ? | 287-303 | BH max KJ/m |
| Maximum working 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 product - report
These information represent the result of a physical calculation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ. Treat these calculations as a supplementary guide when designing systems.
Table 1: Static pull force (force vs distance) - interaction chart
MW 55x25 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4169 Gs
416.9 mT
|
92.25 kg / 203.38 LBS
92250.0 g / 905.0 N
|
critical level |
| 1 mm |
4034 Gs
403.4 mT
|
86.37 kg / 190.41 LBS
86369.8 g / 847.3 N
|
critical level |
| 2 mm |
3894 Gs
389.4 mT
|
80.47 kg / 177.41 LBS
80469.7 g / 789.4 N
|
critical level |
| 3 mm |
3751 Gs
375.1 mT
|
74.67 kg / 164.62 LBS
74670.6 g / 732.5 N
|
critical level |
| 5 mm |
3461 Gs
346.1 mT
|
63.58 kg / 140.17 LBS
63580.6 g / 623.7 N
|
critical level |
| 10 mm |
2756 Gs
275.6 mT
|
40.32 kg / 88.89 LBS
40320.8 g / 395.5 N
|
critical level |
| 15 mm |
2140 Gs
214.0 mT
|
24.31 kg / 53.59 LBS
24308.3 g / 238.5 N
|
critical level |
| 20 mm |
1644 Gs
164.4 mT
|
14.34 kg / 31.61 LBS
14338.1 g / 140.7 N
|
critical level |
| 30 mm |
975 Gs
97.5 mT
|
5.05 kg / 11.12 LBS
5046.0 g / 49.5 N
|
warning |
| 50 mm |
388 Gs
38.8 mT
|
0.80 kg / 1.77 LBS
801.0 g / 7.9 N
|
weak grip |
Table 2: Shear hold (wall)
MW 55x25 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
18.45 kg / 40.68 LBS
18450.0 g / 181.0 N
|
| 1 mm | Stal (~0.2) |
17.27 kg / 38.08 LBS
17274.0 g / 169.5 N
|
| 2 mm | Stal (~0.2) |
16.09 kg / 35.48 LBS
16094.0 g / 157.9 N
|
| 3 mm | Stal (~0.2) |
14.93 kg / 32.92 LBS
14934.0 g / 146.5 N
|
| 5 mm | Stal (~0.2) |
12.72 kg / 28.03 LBS
12716.0 g / 124.7 N
|
| 10 mm | Stal (~0.2) |
8.06 kg / 17.78 LBS
8064.0 g / 79.1 N
|
| 15 mm | Stal (~0.2) |
4.86 kg / 10.72 LBS
4862.0 g / 47.7 N
|
| 20 mm | Stal (~0.2) |
2.87 kg / 6.32 LBS
2868.0 g / 28.1 N
|
| 30 mm | Stal (~0.2) |
1.01 kg / 2.23 LBS
1010.0 g / 9.9 N
|
| 50 mm | Stal (~0.2) |
0.16 kg / 0.35 LBS
160.0 g / 1.6 N
|
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 55x25 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
27.68 kg / 61.01 LBS
27675.0 g / 271.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
18.45 kg / 40.68 LBS
18450.0 g / 181.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
9.23 kg / 20.34 LBS
9225.0 g / 90.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
46.13 kg / 101.69 LBS
46125.0 g / 452.5 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 55x25 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
3.08 kg / 6.78 LBS
3075.0 g / 30.2 N
|
| 1 mm |
|
7.69 kg / 16.95 LBS
7687.5 g / 75.4 N
|
| 2 mm |
|
15.37 kg / 33.90 LBS
15375.0 g / 150.8 N
|
| 3 mm |
|
23.06 kg / 50.84 LBS
23062.5 g / 226.2 N
|
| 5 mm |
|
38.44 kg / 84.74 LBS
38437.5 g / 377.1 N
|
| 10 mm |
|
76.88 kg / 169.48 LBS
76875.0 g / 754.1 N
|
| 11 mm |
|
84.56 kg / 186.43 LBS
84562.5 g / 829.6 N
|
| 12 mm |
|
92.25 kg / 203.38 LBS
92250.0 g / 905.0 N
|
Table 5: Working in heat (material behavior) - power drop
MW 55x25 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
92.25 kg / 203.38 LBS
92250.0 g / 905.0 N
|
OK |
| 40 °C | -2.2% |
90.22 kg / 198.90 LBS
90220.5 g / 885.1 N
|
OK |
| 60 °C | -4.4% |
88.19 kg / 194.43 LBS
88191.0 g / 865.2 N
|
|
| 80 °C | -6.6% |
86.16 kg / 189.95 LBS
86161.5 g / 845.2 N
|
|
| 100 °C | -28.8% |
65.68 kg / 144.80 LBS
65682.0 g / 644.3 N
|
Table 6: Two magnets (attraction) - field collision
MW 55x25 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
254.60 kg / 561.30 LBS
5 431 Gs
|
38.19 kg / 84.20 LBS
38190 g / 374.6 N
|
N/A |
| 1 mm |
246.57 kg / 543.59 LBS
8 206 Gs
|
36.99 kg / 81.54 LBS
36985 g / 362.8 N
|
221.91 kg / 489.23 LBS
~0 Gs
|
| 2 mm |
238.37 kg / 525.52 LBS
8 068 Gs
|
35.76 kg / 78.83 LBS
35756 g / 350.8 N
|
214.54 kg / 472.97 LBS
~0 Gs
|
| 3 mm |
230.21 kg / 507.52 LBS
7 929 Gs
|
34.53 kg / 76.13 LBS
34531 g / 338.7 N
|
207.19 kg / 456.77 LBS
~0 Gs
|
| 5 mm |
214.04 kg / 471.88 LBS
7 645 Gs
|
32.11 kg / 70.78 LBS
32106 g / 315.0 N
|
192.64 kg / 424.69 LBS
~0 Gs
|
| 10 mm |
175.48 kg / 386.86 LBS
6 923 Gs
|
26.32 kg / 58.03 LBS
26322 g / 258.2 N
|
157.93 kg / 348.17 LBS
~0 Gs
|
| 20 mm |
111.28 kg / 245.33 LBS
5 513 Gs
|
16.69 kg / 36.80 LBS
16692 g / 163.8 N
|
100.15 kg / 220.80 LBS
~0 Gs
|
| 50 mm |
23.33 kg / 51.43 LBS
2 524 Gs
|
3.50 kg / 7.71 LBS
3499 g / 34.3 N
|
20.99 kg / 46.28 LBS
~0 Gs
|
| 60 mm |
13.93 kg / 30.70 LBS
1 950 Gs
|
2.09 kg / 4.61 LBS
2089 g / 20.5 N
|
12.53 kg / 27.63 LBS
~0 Gs
|
| 70 mm |
8.48 kg / 18.70 LBS
1 522 Gs
|
1.27 kg / 2.81 LBS
1272 g / 12.5 N
|
7.63 kg / 16.83 LBS
~0 Gs
|
| 80 mm |
5.29 kg / 11.66 LBS
1 202 Gs
|
0.79 kg / 1.75 LBS
793 g / 7.8 N
|
4.76 kg / 10.50 LBS
~0 Gs
|
| 90 mm |
3.38 kg / 7.45 LBS
961 Gs
|
0.51 kg / 1.12 LBS
507 g / 5.0 N
|
3.04 kg / 6.70 LBS
~0 Gs
|
| 100 mm |
2.21 kg / 4.87 LBS
777 Gs
|
0.33 kg / 0.73 LBS
332 g / 3.3 N
|
1.99 kg / 4.39 LBS
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
MW 55x25 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 27.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 21.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 17.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 13.0 cm |
| Remote | 50 Gs (5.0 mT) | 12.0 cm |
| Payment card | 400 Gs (40.0 mT) | 5.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 4.5 cm |
Table 8: Impact energy (cracking risk) - warning
MW 55x25 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
19.19 km/h
(5.33 m/s)
|
6.33 J | |
| 30 mm |
23.74 km/h
(6.59 m/s)
|
9.68 J | |
| 50 mm |
24.27 km/h
(6.74 m/s)
|
10.12 J | |
| 100 mm |
24.39 km/h
(6.78 m/s)
|
10.23 J |
Table 9: Coating parameters (durability)
MW 55x25 / 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: Electrical data (Flux)
MW 55x25 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 101 075 Mx | 1010.7 µWb |
| Pc Coefficient | 0.55 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 55x25 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 92.25 kg | Standard |
| Water (riverbed) |
105.63 kg
(+13.38 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. computer case) severely weakens the holding force.
3. Temperature resistance
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.55
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.
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 |
Other offers
Pros and cons of rare earth magnets.
Benefits
- They have stable power, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
- They do not lose their magnetic properties even under strong external field,
- A magnet with a smooth nickel surface has an effective appearance,
- Magnets possess extremely high magnetic induction on the outer layer,
- Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to versatility in designing and the ability to customize to client solutions,
- Key role in electronics industry – they find application in magnetic memories, electromotive mechanisms, diagnostic systems, and 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
- They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- Due to limitations in creating threads and complicated shapes in magnets, we propose using cover - magnetic mechanism.
- Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
- Due to neodymium price, their price exceeds standard values,
Holding force characteristics
Best holding force of the magnet in ideal parameters – what it depends on?
- with the contact of a sheet made of special test steel, ensuring full magnetic saturation
- possessing a thickness of minimum 10 mm to avoid saturation
- characterized by even structure
- without the slightest insulating layer between the magnet and steel
- during detachment in a direction perpendicular to the mounting surface
- at conditions approx. 20°C
Determinants of lifting force in real conditions
- Air gap (between the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
- Direction of force – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Chemical composition of the base – mild steel gives the best results. Alloy steels lower magnetic properties and lifting capacity.
- Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).
Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.
Precautions when working with NdFeB magnets
Bone fractures
Watch your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!
Nickel coating and allergies
It is widely known that nickel (standard magnet coating) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands and opt for versions in plastic housing.
Implant safety
Individuals with a pacemaker must keep an large gap from magnets. The magnetic field can disrupt the functioning of the implant.
Fire warning
Machining of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Protect data
Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.
Eye protection
NdFeB magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them breaking into shards.
Power loss in heat
Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.
Powerful field
Use magnets consciously. Their immense force can shock even experienced users. Stay alert and do not underestimate their force.
Compass and GPS
GPS units and smartphones are highly susceptible to magnetic fields. Direct contact with a strong magnet can ruin the sensors in your phone.
Product not for children
Absolutely store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are fatal.
