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 of the product - 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 |
Technical simulation of the product - report
The following data constitute the result of a engineering calculation. Values rely on models for the class Nd2Fe14B. Actual parameters may differ. Use these data as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs distance) - power drop
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
|
crushing |
| 1 mm |
4034 Gs
403.4 mT
|
86.37 kg / 190.41 pounds
86369.8 g / 847.3 N
|
crushing |
| 2 mm |
3894 Gs
389.4 mT
|
80.47 kg / 177.41 pounds
80469.7 g / 789.4 N
|
crushing |
| 3 mm |
3751 Gs
375.1 mT
|
74.67 kg / 164.62 pounds
74670.6 g / 732.5 N
|
crushing |
| 5 mm |
3461 Gs
346.1 mT
|
63.58 kg / 140.17 pounds
63580.6 g / 623.7 N
|
crushing |
| 10 mm |
2756 Gs
275.6 mT
|
40.32 kg / 88.89 pounds
40320.8 g / 395.5 N
|
crushing |
| 15 mm |
2140 Gs
214.0 mT
|
24.31 kg / 53.59 pounds
24308.3 g / 238.5 N
|
crushing |
| 20 mm |
1644 Gs
164.4 mT
|
14.34 kg / 31.61 pounds
14338.1 g / 140.7 N
|
crushing |
| 30 mm |
975 Gs
97.5 mT
|
5.05 kg / 11.12 pounds
5046.0 g / 49.5 N
|
medium risk |
| 50 mm |
388 Gs
38.8 mT
|
0.80 kg / 1.77 pounds
801.0 g / 7.9 N
|
low risk |
Table 2: Slippage capacity (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: Vertical assembly (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 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: Material efficiency (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 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 (stability) - resistance threshold
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: Magnet-Magnet interaction (repulsion) - field range
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 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: Hazards (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 |
| Car key | 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 |
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: Corrosion resistance
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: Construction 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: Hydrostatics and buoyancy
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
*Caution: On a vertical surface, the magnet holds only approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) drastically reduces the holding force.
3. Thermal stability
*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 |
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Pros as well as cons of rare earth magnets.
Benefits
- They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (in testing),
- Neodymium magnets remain highly resistant to magnetic field loss caused by magnetic disturbances,
- In other words, due to the reflective surface of gold, the element gains visual value,
- The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
- Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of detailed machining as well as adjusting to precise conditions,
- Fundamental importance in advanced technology sectors – they find application in computer drives, drive modules, precision medical tools, also technologically advanced constructions.
- Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,
Weaknesses
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
- Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- Magnets exposed to a humid environment can rust. Therefore when 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 complex forms - preferred is a housing - magnetic holder.
- Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products are able to complicate diagnosis medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Breakaway strength of the magnet in ideal conditions – what it depends on?
- on a block made of structural steel, optimally conducting the magnetic field
- possessing a thickness of minimum 10 mm to ensure full flux closure
- characterized by smoothness
- without any air gap between the magnet and steel
- under perpendicular force vector (90-degree angle)
- in neutral thermal conditions
Key elements affecting lifting force
- Clearance – the presence of foreign body (rust, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Load vector – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
- Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures reduce magnetic permeability and lifting capacity.
- Surface condition – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
- Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.
Safe handling of neodymium magnets
Heat sensitivity
Keep cool. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).
Powerful field
Handle magnets consciously. Their powerful strength can surprise even experienced users. Stay alert and respect their force.
Eye protection
Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.
Keep away from computers
Do not bring magnets near a wallet, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.
Crushing risk
Pinching hazard: The pulling power is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.
Compass and GPS
A strong magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Maintain magnets near a device to prevent breaking the sensors.
Flammability
Dust created during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.
Sensitization to coating
It is widely known that nickel (standard magnet coating) is a strong allergen. If your skin reacts to metals, avoid touching magnets with bare hands and opt for coated magnets.
Choking Hazard
Adult use only. Small elements can be swallowed, leading to severe trauma. Store out of reach of kids and pets.
Health Danger
Life threat: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
