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 details - 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 modeling of the magnet - data
These values represent the outcome of a engineering calculation. Values are based on models for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs gap) - 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 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
|
strong |
| 50 mm |
388 Gs
38.8 mT
|
0.80 kg / 1.77 LBS
801.0 g / 7.9 N
|
safe |
Table 2: Vertical load (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: Wall mounting (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) - 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: Thermal stability (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 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) - forces in the system
MW 55x25 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear 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: Protective zones (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 |
| Timepiece | 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: Collisions (kinetic energy) - collision effects
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: Surface protection spec
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: 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. Sliding resistance
*Caution: On a vertical surface, the magnet retains only a fraction of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) drastically weakens the holding force.
3. Thermal stability
*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) = 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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Advantages and disadvantages of Nd2Fe14B magnets.
Benefits
- They do not lose power, even during approximately 10 years – the drop in strength is only ~1% (according to tests),
- They show high resistance to demagnetization induced by external magnetic fields,
- By applying a smooth coating of silver, the element gains an professional look,
- Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of detailed machining and optimizing to individual needs,
- Huge importance in future technologies – they are used in hard drives, electric drive systems, medical devices, and industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in compact constructions
Disadvantages
- At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- Limited possibility of making threads in the magnet and complicated forms - recommended is cover - magnetic holder.
- Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Additionally, small components of these magnets can complicate diagnosis medical in case of swallowing.
- With large orders the cost of neodymium magnets can be a barrier,
Pull force analysis
Magnetic strength at its maximum – what it depends on?
- on a block made of structural steel, optimally conducting the magnetic flux
- possessing a thickness of at least 10 mm to avoid saturation
- with a plane perfectly flat
- with zero gap (no coatings)
- for force applied at a right angle (in the magnet axis)
- at standard ambient temperature
Practical lifting capacity: influencing factors
- Clearance – existence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
- Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Plate material – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
- Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.
Warnings
Dust explosion hazard
Machining of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Immense force
Use magnets with awareness. Their powerful strength can surprise even experienced users. Be vigilant and do not underestimate their force.
Magnet fragility
Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Life threat
Patients with a ICD must keep an large gap from magnets. The magnetism can disrupt the operation of the life-saving device.
Keep away from electronics
Navigation devices and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.
Permanent damage
Monitor thermal conditions. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.
Hand protection
Risk of injury: The pulling power is so great that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.
Protect data
Very strong magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.
Adults only
These products are not suitable for play. Swallowing several magnets may result in them attracting across intestines, which constitutes a critical condition and necessitates immediate surgery.
Allergic reactions
Certain individuals experience a sensitization to Ni, which is the standard coating for neodymium magnets. Prolonged contact can result in a rash. We recommend use protective gloves.
