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 |
Engineering analysis of the magnet - technical parameters
The following values constitute the direct effect of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Treat these calculations as a reference point during assembly planning.
Table 1: Static force (pull vs gap) - 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
|
dangerous! |
| 1 mm |
4034 Gs
403.4 mT
|
86.37 kg / 190.41 lbs
86369.8 g / 847.3 N
|
dangerous! |
| 2 mm |
3894 Gs
389.4 mT
|
80.47 kg / 177.41 lbs
80469.7 g / 789.4 N
|
dangerous! |
| 3 mm |
3751 Gs
375.1 mT
|
74.67 kg / 164.62 lbs
74670.6 g / 732.5 N
|
dangerous! |
| 5 mm |
3461 Gs
346.1 mT
|
63.58 kg / 140.17 lbs
63580.6 g / 623.7 N
|
dangerous! |
| 10 mm |
2756 Gs
275.6 mT
|
40.32 kg / 88.89 lbs
40320.8 g / 395.5 N
|
dangerous! |
| 15 mm |
2140 Gs
214.0 mT
|
24.31 kg / 53.59 lbs
24308.3 g / 238.5 N
|
dangerous! |
| 20 mm |
1644 Gs
164.4 mT
|
14.34 kg / 31.61 lbs
14338.1 g / 140.7 N
|
dangerous! |
| 30 mm |
975 Gs
97.5 mT
|
5.05 kg / 11.12 lbs
5046.0 g / 49.5 N
|
medium risk |
| 50 mm |
388 Gs
38.8 mT
|
0.80 kg / 1.77 lbs
801.0 g / 7.9 N
|
low risk |
Table 2: Vertical 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 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: Vertical assembly (sliding) - 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: Material efficiency (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 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 (stability) - 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 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: Magnet-Magnet interaction (attraction) - field range
MW 55x25 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (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: Hazards (electronics) - precautionary measures
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 |
| Mobile device | 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: 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 (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: Physics of underwater searching
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
*Note: On a vertical wall, the magnet holds only a fraction of its nominal pull.
2. Plate thickness effect
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Heat tolerance
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.55
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Pros as well as cons of Nd2Fe14B magnets.
Advantages
- They retain full power for nearly 10 years – the loss is just ~1% (according to analyses),
- Neodymium magnets prove to be extremely resistant to loss of magnetic properties caused by external magnetic fields,
- By using a reflective layer of nickel, the element acquires an proper look,
- Magnetic induction on the working layer of the magnet remains strong,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
- In view of the option of precise molding and customization to unique requirements, magnetic components can be produced in a broad palette of shapes and sizes, which expands the range of possible applications,
- Significant place in modern technologies – they are used in mass storage devices, brushless drives, precision medical tools, and industrial machines.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
- When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- Limited possibility of producing threads in the magnet and complicated forms - preferred is cover - magnetic holder.
- Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, tiny parts of these products can complicate diagnosis medical when they are in the body.
- With large orders the cost of neodymium magnets can be a barrier,
Pull force analysis
Maximum lifting force for a neodymium magnet – what it depends on?
- with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
- possessing a thickness of min. 10 mm to ensure full flux closure
- characterized by lack of roughness
- under conditions of ideal adhesion (metal-to-metal)
- during pulling in a direction perpendicular to the plane
- at room temperature
Key elements affecting lifting force
- Gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
- Steel thickness – too thin steel does not close the flux, causing part of the power to be wasted to the other side.
- Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
- Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
- Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.
Safety rules for work with neodymium magnets
Allergy Warning
Nickel alert: The nickel-copper-nickel coating contains nickel. If redness occurs, immediately stop handling magnets and wear gloves.
Material brittleness
Protect your eyes. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.
Medical interference
Individuals with a pacemaker should maintain an large gap from magnets. The magnetic field can interfere with the operation of the implant.
Magnetic interference
A strong magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Maintain magnets close to a device to avoid damaging the sensors.
Electronic hazard
Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.
Flammability
Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this may cause fire.
Product not for children
Adult use only. Small elements pose a choking risk, leading to severe trauma. Keep out of reach of kids and pets.
Crushing force
Risk of injury: The attraction force is so immense that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.
Thermal limits
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.
Immense force
Be careful. Rare earth magnets attract from a long distance and snap with massive power, often faster than you can move away.
