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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Technical parameters 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 simulation of the assembly - report
The following values are the result of a mathematical simulation. Results are based on algorithms for the material Nd2Fe14B. Actual conditions may differ from theoretical values. Use these calculations as a supplementary guide during assembly planning.
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
|
weak grip |
| 50 mm |
205 Gs
20.5 mT
|
0.17 kg / 0.38 lbs
172.6 g / 1.7 N
|
weak grip |
Table 2: Sliding 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) - sheet metal selection
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: Thermal resistance (stability) - thermal limit
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) | Shear Strength (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: Protective zones (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 |
| Mechanical watch | 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: Impact energy (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: Coating parameters (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. Shear force
*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Temperature resistance
*For N38 material, 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% |
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 Nd2Fe14B magnets.
Strengths
- Their magnetic field remains stable, and after approximately 10 years it decreases only by ~1% (according to research),
- Magnets perfectly protect themselves against demagnetization caused by foreign field sources,
- A magnet with a smooth gold surface is more attractive,
- Magnetic induction on the surface of the magnet remains impressive,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of custom forming as well as optimizing to precise conditions,
- Versatile presence in advanced technology sectors – they find application in magnetic memories, electric motors, precision medical tools, also technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in small systems
Weaknesses
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
- Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- We recommend a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
- Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small elements of these magnets can be problematic in diagnostics medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Lifting parameters
Detachment force of the magnet in optimal conditions – what affects it?
- on a block made of mild steel, perfectly concentrating the magnetic field
- whose thickness is min. 10 mm
- with an polished touching surface
- without the slightest insulating layer between the magnet and steel
- during detachment in a direction perpendicular to the mounting surface
- at standard ambient temperature
Key elements affecting lifting force
- Air gap (between the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
- Direction of force – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
- Plate thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be wasted to the other side.
- Steel grade – the best choice is pure iron steel. Stainless steels may attract less.
- Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
- Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
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. In addition, even a small distance between the magnet’s surface and the plate decreases the load capacity.
Precautions when working with NdFeB magnets
Swallowing risk
Always keep magnets out of reach of children. Choking hazard is significant, and the effects of magnets connecting inside the body are life-threatening.
Crushing force
Danger of trauma: The attraction force is so immense that it can result in blood blisters, crushing, and broken bones. Protective gloves are recommended.
Immense force
Exercise caution. Neodymium magnets act from a long distance and snap with massive power, often faster than you can react.
Combustion hazard
Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this may cause fire.
Protective goggles
Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Data carriers
Avoid bringing magnets close to a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.
Threat to navigation
Note: neodymium magnets produce a field that confuses precision electronics. Keep a safe distance from your mobile, tablet, and GPS.
Medical implants
Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.
Heat sensitivity
Watch the temperature. Heating the magnet to high heat will permanently weaken its properties and pulling force.
Skin irritation risks
Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation happens, cease handling magnets and use protective gear.
