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
bulk discounts:
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Technical of the product - 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 |
Physical modeling of the magnet - data
The following data constitute the outcome of a engineering simulation. Values rely on models for the class Nd2Fe14B. Operational parameters might slightly differ. Treat these calculations as a supplementary guide when designing systems.
Table 1: Static pull force (pull vs gap) - power drop
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
|
medium risk |
| 20 mm |
1096 Gs
109.6 mT
|
4.94 kg / 10.88 lbs
4936.3 g / 48.4 N
|
medium risk |
| 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 force (wall)
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: Wall mounting (shearing) - behavior on slippery surfaces
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: Material efficiency (saturation) - 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) - resistance threshold
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 (repulsion) - forces in the system
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: Safety (HSE) (electronics) - warnings
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 |
| Phone / Smartphone | 40 Gs (4.0 mT) | 10.0 cm |
| Remote | 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: Collisions (kinetic energy) - collision effects
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: Anti-corrosion coating durability
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: Electrical 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)
*Note: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC 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) = 0.44
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.
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 |
Other products
Advantages as well as disadvantages of neodymium magnets.
Benefits
- They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
- They are extremely resistant to demagnetization induced by external field influence,
- In other words, due to the smooth layer of nickel, the element gains visual value,
- The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- In view of the ability of flexible shaping and customization to individualized projects, NdFeB magnets can be produced in a broad palette of forms and dimensions, which makes them more universal,
- Key role in high-tech industry – they are commonly used in hard drives, electric motors, medical equipment, as well as complex engineering applications.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Cons
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
- Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. 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 magnets in rubber or plastics, which secure oxidation as well as corrosion.
- Due to limitations in realizing nuts and complicated shapes in magnets, we propose using cover - magnetic holder.
- Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Holding force characteristics
Maximum lifting capacity of the magnet – what it depends on?
- on a base made of mild steel, optimally conducting the magnetic field
- whose thickness equals approx. 10 mm
- with a surface free of scratches
- with zero gap (no paint)
- for force applied at a right angle (in the magnet axis)
- at temperature approx. 20 degrees Celsius
Magnet lifting force in use – key factors
- Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Material composition – not every steel attracts identically. High carbon content worsen the attraction effect.
- Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
- Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.
Precautions when working with NdFeB magnets
Handling rules
Handle with care. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can react.
Permanent damage
Standard neodymium magnets (N-type) lose power when the temperature goes above 80°C. This process is irreversible.
Threat to navigation
Remember: rare earth magnets generate a field that disrupts sensitive sensors. Keep a separation from your phone, device, and GPS.
Medical implants
Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.
Allergic reactions
Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, refrain from direct skin contact or choose encased magnets.
Cards and drives
Powerful magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.
No play value
Only for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep away from kids and pets.
Crushing risk
Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!
Dust is flammable
Powder created during cutting of magnets is combustible. Do not drill into magnets unless you are an expert.
Fragile material
Watch out for shards. Magnets can explode upon violent connection, ejecting shards into the air. Eye protection is mandatory.
