MW 45x15 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010070
GTIN/EAN: 5906301810698
Diameter Ø
45 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
178.92 g
Magnetization Direction
↑ axial
Load capacity
48.55 kg / 476.32 N
Magnetic Induction
343.84 mT / 3438 Gs
Coating
[NiCuNi] Nickel
61.84 ZŁ with VAT / pcs + price for transport
50.28 ZŁ net + 23% VAT / pcs
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Detailed specification - MW 45x15 / N38 - cylindrical magnet
Specification / characteristics - MW 45x15 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010070 |
| GTIN/EAN | 5906301810698 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 45 mm [±0,1 mm] |
| Height | 15 mm [±0,1 mm] |
| Weight | 178.92 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 48.55 kg / 476.32 N |
| Magnetic Induction ~ ? | 343.84 mT / 3438 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 analysis of the magnet - technical parameters
The following information are the outcome of a physical calculation. Values were calculated on models for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.
Table 1: Static pull force (force vs distance) - characteristics
MW 45x15 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3438 Gs
343.8 mT
|
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
|
crushing |
| 1 mm |
3318 Gs
331.8 mT
|
45.21 kg / 99.68 lbs
45214.3 g / 443.6 N
|
crushing |
| 2 mm |
3189 Gs
318.9 mT
|
41.76 kg / 92.07 lbs
41762.8 g / 409.7 N
|
crushing |
| 3 mm |
3054 Gs
305.4 mT
|
38.30 kg / 84.44 lbs
38303.2 g / 375.8 N
|
crushing |
| 5 mm |
2774 Gs
277.4 mT
|
31.61 kg / 69.69 lbs
31610.0 g / 310.1 N
|
crushing |
| 10 mm |
2090 Gs
209.0 mT
|
17.95 kg / 39.57 lbs
17948.5 g / 176.1 N
|
crushing |
| 15 mm |
1521 Gs
152.1 mT
|
9.50 kg / 20.95 lbs
9500.8 g / 93.2 N
|
strong |
| 20 mm |
1096 Gs
109.6 mT
|
4.94 kg / 10.88 lbs
4936.3 g / 48.4 N
|
strong |
| 30 mm |
585 Gs
58.5 mT
|
1.41 kg / 3.10 lbs
1407.9 g / 13.8 N
|
safe |
| 50 mm |
205 Gs
20.5 mT
|
0.17 kg / 0.38 lbs
172.6 g / 1.7 N
|
safe |
Table 2: Slippage load (vertical surface)
MW 45x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
9.71 kg / 21.41 lbs
9710.0 g / 95.3 N
|
| 1 mm | Stal (~0.2) |
9.04 kg / 19.93 lbs
9042.0 g / 88.7 N
|
| 2 mm | Stal (~0.2) |
8.35 kg / 18.41 lbs
8352.0 g / 81.9 N
|
| 3 mm | Stal (~0.2) |
7.66 kg / 16.89 lbs
7660.0 g / 75.1 N
|
| 5 mm | Stal (~0.2) |
6.32 kg / 13.94 lbs
6322.0 g / 62.0 N
|
| 10 mm | Stal (~0.2) |
3.59 kg / 7.91 lbs
3590.0 g / 35.2 N
|
| 15 mm | Stal (~0.2) |
1.90 kg / 4.19 lbs
1900.0 g / 18.6 N
|
| 20 mm | Stal (~0.2) |
0.99 kg / 2.18 lbs
988.0 g / 9.7 N
|
| 30 mm | Stal (~0.2) |
0.28 kg / 0.62 lbs
282.0 g / 2.8 N
|
| 50 mm | Stal (~0.2) |
0.03 kg / 0.07 lbs
34.0 g / 0.3 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MW 45x15 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
14.56 kg / 32.11 lbs
14565.0 g / 142.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
9.71 kg / 21.41 lbs
9710.0 g / 95.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.86 kg / 10.70 lbs
4855.0 g / 47.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
24.28 kg / 53.52 lbs
24275.0 g / 238.1 N
|
Table 4: Steel thickness (substrate influence) - power losses
MW 45x15 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.43 kg / 5.35 lbs
2427.5 g / 23.8 N
|
| 1 mm |
|
6.07 kg / 13.38 lbs
6068.8 g / 59.5 N
|
| 2 mm |
|
12.14 kg / 26.76 lbs
12137.5 g / 119.1 N
|
| 3 mm |
|
18.21 kg / 40.14 lbs
18206.2 g / 178.6 N
|
| 5 mm |
|
30.34 kg / 66.90 lbs
30343.8 g / 297.7 N
|
| 10 mm |
|
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
|
| 11 mm |
|
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
|
| 12 mm |
|
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
|
Table 5: Working in heat (stability) - power drop
MW 45x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
|
OK |
| 40 °C | -2.2% |
47.48 kg / 104.68 lbs
47481.9 g / 465.8 N
|
OK |
| 60 °C | -4.4% |
46.41 kg / 102.32 lbs
46413.8 g / 455.3 N
|
|
| 80 °C | -6.6% |
45.35 kg / 99.97 lbs
45345.7 g / 444.8 N
|
|
| 100 °C | -28.8% |
34.57 kg / 76.21 lbs
34567.6 g / 339.1 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 45x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
115.89 kg / 255.50 lbs
4 958 Gs
|
17.38 kg / 38.32 lbs
17384 g / 170.5 N
|
N/A |
| 1 mm |
111.99 kg / 246.89 lbs
6 759 Gs
|
16.80 kg / 37.03 lbs
16798 g / 164.8 N
|
100.79 kg / 222.20 lbs
~0 Gs
|
| 2 mm |
107.93 kg / 237.94 lbs
6 636 Gs
|
16.19 kg / 35.69 lbs
16189 g / 158.8 N
|
97.14 kg / 214.15 lbs
~0 Gs
|
| 3 mm |
103.82 kg / 228.89 lbs
6 508 Gs
|
15.57 kg / 34.33 lbs
15573 g / 152.8 N
|
93.44 kg / 206.00 lbs
~0 Gs
|
| 5 mm |
95.55 kg / 210.66 lbs
6 244 Gs
|
14.33 kg / 31.60 lbs
14333 g / 140.6 N
|
86.00 kg / 189.59 lbs
~0 Gs
|
| 10 mm |
75.46 kg / 166.35 lbs
5 548 Gs
|
11.32 kg / 24.95 lbs
11318 g / 111.0 N
|
67.91 kg / 149.72 lbs
~0 Gs
|
| 20 mm |
42.84 kg / 94.46 lbs
4 181 Gs
|
6.43 kg / 14.17 lbs
6427 g / 63.0 N
|
38.56 kg / 85.01 lbs
~0 Gs
|
| 50 mm |
6.20 kg / 13.67 lbs
1 591 Gs
|
0.93 kg / 2.05 lbs
930 g / 9.1 N
|
5.58 kg / 12.31 lbs
~0 Gs
|
| 60 mm |
3.36 kg / 7.41 lbs
1 171 Gs
|
0.50 kg / 1.11 lbs
504 g / 4.9 N
|
3.02 kg / 6.67 lbs
~0 Gs
|
| 70 mm |
1.89 kg / 4.16 lbs
877 Gs
|
0.28 kg / 0.62 lbs
283 g / 2.8 N
|
1.70 kg / 3.74 lbs
~0 Gs
|
| 80 mm |
1.10 kg / 2.42 lbs
669 Gs
|
0.16 kg / 0.36 lbs
165 g / 1.6 N
|
0.99 kg / 2.18 lbs
~0 Gs
|
| 90 mm |
0.66 kg / 1.46 lbs
520 Gs
|
0.10 kg / 0.22 lbs
99 g / 1.0 N
|
0.60 kg / 1.31 lbs
~0 Gs
|
| 100 mm |
0.41 kg / 0.91 lbs
410 Gs
|
0.06 kg / 0.14 lbs
62 g / 0.6 N
|
0.37 kg / 0.82 lbs
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MW 45x15 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 20.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 16.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 12.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 10.0 cm |
| Car key | 50 Gs (5.0 mT) | 9.0 cm |
| Payment card | 400 Gs (40.0 mT) | 4.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Dynamics (kinetic energy) - warning
MW 45x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.09 km/h
(5.58 m/s)
|
2.79 J | |
| 30 mm |
29.29 km/h
(8.14 m/s)
|
5.92 J | |
| 50 mm |
37.23 km/h
(10.34 m/s)
|
9.57 J | |
| 100 mm |
52.54 km/h
(14.59 m/s)
|
19.05 J |
Table 9: Corrosion resistance
MW 45x15 / 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 45x15 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 57 854 Mx | 578.5 µWb |
| Pc Coefficient | 0.44 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MW 45x15 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 48.55 kg | Standard |
| Water (riverbed) |
55.59 kg
(+7.04 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical surface, the magnet retains only approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Power loss vs temp
*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) = 0.44
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See also offers
Advantages and disadvantages of Nd2Fe14B magnets.
Benefits
- They retain magnetic properties for around 10 years – the loss is just ~1% (based on simulations),
- They are noted for resistance to demagnetization induced by presence of other magnetic fields,
- In other words, due to the smooth finish of nickel, the element looks attractive,
- Neodymium magnets ensure maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of detailed modeling and adjusting to precise applications,
- Key role in innovative solutions – they are utilized in mass storage devices, brushless drives, medical devices, and other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in compact constructions
Cons
- They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise 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 complex forms - recommended is a housing - mounting mechanism.
- Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what affects it?
- with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
- possessing a massiveness of at least 10 mm to ensure full flux closure
- with an ideally smooth contact surface
- with zero gap (no paint)
- for force acting at a right angle (pull-off, not shear)
- in neutral thermal conditions
Lifting capacity in real conditions – factors
- Space between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
- Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
- Surface finish – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
- Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).
Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate reduces the load capacity.
Precautions when working with neodymium magnets
Metal Allergy
Certain individuals experience a sensitization to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact may cause a rash. We suggest use protective gloves.
Product not for children
Product intended for adults. Small elements can be swallowed, leading to severe trauma. Store out of reach of kids and pets.
Impact on smartphones
A strong magnetic field interferes with the functioning of magnetometers in phones and GPS navigation. Maintain magnets close to a device to prevent damaging the sensors.
Implant safety
Warning for patients: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or request help to handle the magnets.
Threat to electronics
Do not bring magnets close to a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.
Fragile material
NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them shattering into small pieces.
Power loss in heat
Do not overheat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).
Fire warning
Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Handling guide
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.
Hand protection
Risk of injury: The attraction force is so immense that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.
