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
Load capacity
92.25 kg / 904.94 N
Magnetic Induction
416.97 mT / 4170 Gs
Coating
[NiCuNi] Nickel
154.21 ZŁ with VAT / pcs + price for transport
125.37 ZŁ net + 23% VAT / pcs
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Technical specification - 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 |
|---|---|---|
| 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 modeling of the product - data
Presented data constitute the result of a mathematical simulation. Results rely on algorithms for the material Nd2Fe14B. Real-world performance may deviate from the simulation results. Treat these data as a supplementary guide for designers.
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 pounds
92250.0 g / 905.0 N
|
dangerous! |
| 1 mm |
4034 Gs
403.4 mT
|
86.37 kg / 190.41 pounds
86369.8 g / 847.3 N
|
dangerous! |
| 2 mm |
3894 Gs
389.4 mT
|
80.47 kg / 177.41 pounds
80469.7 g / 789.4 N
|
dangerous! |
| 3 mm |
3751 Gs
375.1 mT
|
74.67 kg / 164.62 pounds
74670.6 g / 732.5 N
|
dangerous! |
| 5 mm |
3461 Gs
346.1 mT
|
63.58 kg / 140.17 pounds
63580.6 g / 623.7 N
|
dangerous! |
| 10 mm |
2756 Gs
275.6 mT
|
40.32 kg / 88.89 pounds
40320.8 g / 395.5 N
|
dangerous! |
| 15 mm |
2140 Gs
214.0 mT
|
24.31 kg / 53.59 pounds
24308.3 g / 238.5 N
|
dangerous! |
| 20 mm |
1644 Gs
164.4 mT
|
14.34 kg / 31.61 pounds
14338.1 g / 140.7 N
|
dangerous! |
| 30 mm |
975 Gs
97.5 mT
|
5.05 kg / 11.12 pounds
5046.0 g / 49.5 N
|
strong |
| 50 mm |
388 Gs
38.8 mT
|
0.80 kg / 1.77 pounds
801.0 g / 7.9 N
|
safe |
Table 2: Shear hold (vertical surface)
MW 55x25 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
18.45 kg / 40.68 pounds
18450.0 g / 181.0 N
|
| 1 mm | Stal (~0.2) |
17.27 kg / 38.08 pounds
17274.0 g / 169.5 N
|
| 2 mm | Stal (~0.2) |
16.09 kg / 35.48 pounds
16094.0 g / 157.9 N
|
| 3 mm | Stal (~0.2) |
14.93 kg / 32.92 pounds
14934.0 g / 146.5 N
|
| 5 mm | Stal (~0.2) |
12.72 kg / 28.03 pounds
12716.0 g / 124.7 N
|
| 10 mm | Stal (~0.2) |
8.06 kg / 17.78 pounds
8064.0 g / 79.1 N
|
| 15 mm | Stal (~0.2) |
4.86 kg / 10.72 pounds
4862.0 g / 47.7 N
|
| 20 mm | Stal (~0.2) |
2.87 kg / 6.32 pounds
2868.0 g / 28.1 N
|
| 30 mm | Stal (~0.2) |
1.01 kg / 2.23 pounds
1010.0 g / 9.9 N
|
| 50 mm | Stal (~0.2) |
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
|
Table 3: Wall mounting (shearing) - vertical pull
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 pounds
27675.0 g / 271.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
18.45 kg / 40.68 pounds
18450.0 g / 181.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
9.23 kg / 20.34 pounds
9225.0 g / 90.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
46.13 kg / 101.69 pounds
46125.0 g / 452.5 N
|
Table 4: Steel thickness (substrate influence) - power losses
MW 55x25 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
3.08 kg / 6.78 pounds
3075.0 g / 30.2 N
|
| 1 mm |
|
7.69 kg / 16.95 pounds
7687.5 g / 75.4 N
|
| 2 mm |
|
15.37 kg / 33.90 pounds
15375.0 g / 150.8 N
|
| 3 mm |
|
23.06 kg / 50.84 pounds
23062.5 g / 226.2 N
|
| 5 mm |
|
38.44 kg / 84.74 pounds
38437.5 g / 377.1 N
|
| 10 mm |
|
76.88 kg / 169.48 pounds
76875.0 g / 754.1 N
|
| 11 mm |
|
84.56 kg / 186.43 pounds
84562.5 g / 829.6 N
|
| 12 mm |
|
92.25 kg / 203.38 pounds
92250.0 g / 905.0 N
|
Table 5: Thermal resistance (material behavior) - thermal limit
MW 55x25 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
92.25 kg / 203.38 pounds
92250.0 g / 905.0 N
|
OK |
| 40 °C | -2.2% |
90.22 kg / 198.90 pounds
90220.5 g / 885.1 N
|
OK |
| 60 °C | -4.4% |
88.19 kg / 194.43 pounds
88191.0 g / 865.2 N
|
|
| 80 °C | -6.6% |
86.16 kg / 189.95 pounds
86161.5 g / 845.2 N
|
|
| 100 °C | -28.8% |
65.68 kg / 144.80 pounds
65682.0 g / 644.3 N
|
Table 6: Two magnets (attraction) - field collision
MW 55x25 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
254.60 kg / 561.30 pounds
5 431 Gs
|
38.19 kg / 84.20 pounds
38190 g / 374.6 N
|
N/A |
| 1 mm |
246.57 kg / 543.59 pounds
8 206 Gs
|
36.99 kg / 81.54 pounds
36985 g / 362.8 N
|
221.91 kg / 489.23 pounds
~0 Gs
|
| 2 mm |
238.37 kg / 525.52 pounds
8 068 Gs
|
35.76 kg / 78.83 pounds
35756 g / 350.8 N
|
214.54 kg / 472.97 pounds
~0 Gs
|
| 3 mm |
230.21 kg / 507.52 pounds
7 929 Gs
|
34.53 kg / 76.13 pounds
34531 g / 338.7 N
|
207.19 kg / 456.77 pounds
~0 Gs
|
| 5 mm |
214.04 kg / 471.88 pounds
7 645 Gs
|
32.11 kg / 70.78 pounds
32106 g / 315.0 N
|
192.64 kg / 424.69 pounds
~0 Gs
|
| 10 mm |
175.48 kg / 386.86 pounds
6 923 Gs
|
26.32 kg / 58.03 pounds
26322 g / 258.2 N
|
157.93 kg / 348.17 pounds
~0 Gs
|
| 20 mm |
111.28 kg / 245.33 pounds
5 513 Gs
|
16.69 kg / 36.80 pounds
16692 g / 163.8 N
|
100.15 kg / 220.80 pounds
~0 Gs
|
| 50 mm |
23.33 kg / 51.43 pounds
2 524 Gs
|
3.50 kg / 7.71 pounds
3499 g / 34.3 N
|
20.99 kg / 46.28 pounds
~0 Gs
|
| 60 mm |
13.93 kg / 30.70 pounds
1 950 Gs
|
2.09 kg / 4.61 pounds
2089 g / 20.5 N
|
12.53 kg / 27.63 pounds
~0 Gs
|
| 70 mm |
8.48 kg / 18.70 pounds
1 522 Gs
|
1.27 kg / 2.81 pounds
1272 g / 12.5 N
|
7.63 kg / 16.83 pounds
~0 Gs
|
| 80 mm |
5.29 kg / 11.66 pounds
1 202 Gs
|
0.79 kg / 1.75 pounds
793 g / 7.8 N
|
4.76 kg / 10.50 pounds
~0 Gs
|
| 90 mm |
3.38 kg / 7.45 pounds
961 Gs
|
0.51 kg / 1.12 pounds
507 g / 5.0 N
|
3.04 kg / 6.70 pounds
~0 Gs
|
| 100 mm |
2.21 kg / 4.87 pounds
777 Gs
|
0.33 kg / 0.73 pounds
332 g / 3.3 N
|
1.99 kg / 4.39 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - 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: Dynamics (kinetic energy) - warning
MW 55x25 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
18.05 km/h
(5.01 m/s)
|
5.60 J | |
| 30 mm |
25.98 km/h
(7.22 m/s)
|
11.60 J | |
| 50 mm |
32.63 km/h
(9.06 m/s)
|
18.30 J | |
| 100 mm |
45.90 km/h
(12.75 m/s)
|
36.21 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 (Pc)
MW 55x25 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 101 075 Mx | 1010.7 µWb |
| Pc Coefficient | 0.55 | Low (Flat) |
Table 11: Submerged application
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. Wall mount (shear)
*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) drastically 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) = 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.
Chemical composition
| 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 |
See also products
Strengths and weaknesses of rare earth magnets.
Advantages
- They retain full power for around ten years – the drop is just ~1% (in theory),
- Neodymium magnets are characterized by remarkably resistant to magnetic field loss caused by external magnetic fields,
- Thanks to the metallic finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
- Magnets are characterized by very high magnetic induction on the outer layer,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
- Thanks to freedom in shaping and the ability to modify to complex applications,
- Key role in innovative solutions – they are used in magnetic memories, electromotive mechanisms, precision medical tools, as well as technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in miniature devices
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
- 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
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
- We recommend a housing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
- Health risk to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these devices are able to disrupt the diagnostic process medical after entering the body.
- With large orders the cost of neodymium magnets is economically unviable,
Lifting parameters
Maximum lifting capacity of the magnet – what it depends on?
- on a block made of structural steel, optimally conducting the magnetic field
- with a thickness no less than 10 mm
- with an polished touching surface
- without any clearance between the magnet and steel
- during pulling in a direction perpendicular to the mounting surface
- at room temperature
Key elements affecting lifting force
- Distance – existence of any layer (rust, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
- Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Warnings
Metal Allergy
Certain individuals have a contact allergy to Ni, which is the standard coating for NdFeB magnets. Extended handling might lead to an allergic reaction. We recommend wear protective gloves.
Impact on smartphones
GPS units and smartphones are highly susceptible to magnetic fields. Direct contact with a strong magnet can permanently damage the sensors in your phone.
Serious injuries
Big blocks can break fingers instantly. Do not place your hand between two strong magnets.
ICD Warning
Life threat: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.
Eye protection
Neodymium magnets are sintered ceramics, which means they are very brittle. Impact of two magnets will cause them cracking into small pieces.
Danger to the youngest
Strictly store magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are very dangerous.
Handling guide
Before starting, read the rules. Sudden snapping can destroy the magnet or injure your hand. Think ahead.
Magnetic media
Data protection: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).
Flammability
Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Heat warning
Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and strength.
