MW 45x30 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010073
GTIN: 5906301810728
Diameter Ø
45 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
357.85 g
Magnetization Direction
↑ axial
Load capacity
95.26 kg / 934.48 N
Magnetic Induction
495.87 mT
Coating
[NiCuNi] Nickel
136.80 ZŁ with VAT / pcs + price for transport
111.22 ZŁ net + 23% VAT / pcs
bulk discounts:
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MW 45x30 / N38 - cylindrical magnet
Specification / characteristics MW 45x30 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010073 |
| GTIN | 5906301810728 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 45 mm [±0,1 mm] |
| Height | 30 mm [±0,1 mm] |
| Weight | 357.85 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 95.26 kg / 934.48 N |
| Magnetic Induction ~ ? | 495.87 mT |
| 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 | T |
| 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 106 | °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 assembly - technical parameters
These information are the direct effect of a engineering simulation. Results are based on models for the material NdFeB. Operational performance may deviate from the simulation results. Please consider these data as a reference point when designing systems.
MW 45x30 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
4958 Gs
495.8 mT
|
95.26 kg / 95260.0 g
934.5 N
|
critical level |
| 1 mm |
4742 Gs
474.2 mT
|
87.16 kg / 87160.1 g
855.0 N
|
critical level |
| 2 mm |
4523 Gs
452.3 mT
|
79.28 kg / 79277.0 g
777.7 N
|
critical level |
| 5 mm |
3870 Gs
387.0 mT
|
58.05 kg / 58052.8 g
569.5 N
|
critical level |
| 10 mm |
2886 Gs
288.6 mT
|
32.27 kg / 32272.4 g
316.6 N
|
critical level |
| 15 mm |
2106 Gs
210.6 mT
|
17.19 kg / 17193.7 g
168.7 N
|
critical level |
| 20 mm |
1535 Gs
153.5 mT
|
9.13 kg / 9129.8 g
89.6 N
|
strong |
| 30 mm |
845 Gs
84.5 mT
|
2.77 kg / 2768.8 g
27.2 N
|
strong |
| 50 mm |
315 Gs
31.5 mT
|
0.38 kg / 383.4 g
3.8 N
|
safe |
MW 45x30 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
28.58 kg / 28578.0 g
280.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
19.05 kg / 19052.0 g
186.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
9.53 kg / 9526.0 g
93.5 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
47.63 kg / 47630.0 g
467.3 N
|
MW 45x30 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
3.18 kg / 3175.3 g
31.2 N
|
| 1 mm |
|
7.94 kg / 7938.3 g
77.9 N
|
| 2 mm |
|
15.88 kg / 15876.7 g
155.8 N
|
| 5 mm |
|
39.69 kg / 39691.7 g
389.4 N
|
| 10 mm |
|
79.38 kg / 79383.3 g
778.8 N
|
MW 45x30 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
95.26 kg / 95260.0 g
934.5 N
|
OK |
| 40 °C | -2.2% |
93.16 kg / 93164.3 g
913.9 N
|
OK |
| 60 °C | -4.4% |
91.07 kg / 91068.6 g
893.4 N
|
OK |
| 80 °C | -6.6% |
88.97 kg / 88972.8 g
872.8 N
|
|
| 100 °C | -28.8% |
67.83 kg / 67825.1 g
665.4 N
|
MW 45x30 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
142.89 kg / 142890.0 g
1401.8 N
|
N/A |
| 2 mm |
118.92 kg / 118920.0 g
1166.6 N
|
110.99 kg / 110992.0 g
1088.8 N
|
| 5 mm |
87.07 kg / 87075.0 g
854.2 N
|
81.27 kg / 81270.0 g
797.3 N
|
| 10 mm |
48.41 kg / 48405.0 g
474.9 N
|
45.18 kg / 45178.0 g
443.2 N
|
| 20 mm |
13.70 kg / 13695.0 g
134.3 N
|
12.78 kg / 12782.0 g
125.4 N
|
| 50 mm |
0.57 kg / 570.0 g
5.6 N
|
0.53 kg / 532.0 g
5.2 N
|
MW 45x30 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 25.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 20.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 15.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 12.0 cm |
| Remote | 50 Gs (5.0 mT) | 11.0 cm |
| Payment card | 400 Gs (40.0 mT) | 4.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 4.0 cm |
MW 45x30 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
19.63 km/h
(5.45 m/s)
|
5.32 J | |
| 30 mm |
29.01 km/h
(8.06 m/s)
|
11.62 J | |
| 50 mm |
36.89 km/h
(10.25 m/s)
|
18.78 J | |
| 100 mm |
52.04 km/h
(14.46 m/s)
|
37.39 J |
MW 45x30 / 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) |
MW 45x30 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 95.26 kg | Standard |
| Water (riverbed) |
109.07 kg
(+13.81 kg Buoyancy gain)
|
+14.5% |
Other deals
Pros and cons of rare earth magnets.
Besides their stability, neodymium magnets are valued for these benefits:
- They do not lose strength, even over nearly 10 years – the decrease in lifting capacity is only ~1% (theoretically),
- They retain their magnetic properties even under close interference source,
- In other words, due to the glossy surface of nickel, the element gains a professional look,
- The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Considering the option of accurate forming and customization to unique projects, NdFeB magnets can be manufactured in a wide range of geometric configurations, which expands the range of possible applications,
- Versatile presence in modern technologies – they are commonly used in computer drives, brushless drives, precision medical tools, as well as complex engineering applications.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Cons of neodymium magnets: tips and applications.
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
- NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (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 extremely resistant to heat
- Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in producing nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
- Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these magnets can complicate diagnosis medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Detachment force of the magnet in optimal conditions – what contributes to it?
The load parameter shown represents the peak performance, obtained under laboratory conditions, meaning:
- using a base made of low-carbon steel, serving as a magnetic yoke
- whose transverse dimension is min. 10 mm
- with a surface cleaned and smooth
- without the slightest insulating layer between the magnet and steel
- under vertical force direction (90-degree angle)
- at conditions approx. 20°C
Magnet lifting force in use – key factors
In real-world applications, the actual lifting capacity results from many variables, listed from the most important:
- Gap (between the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
- Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Steel type – low-carbon steel attracts best. Alloy steels lower magnetic properties and lifting capacity.
- Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
- Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate decreases the holding force.
Safety rules for work with NdFeB magnets
Powerful field
Be careful. Rare earth magnets act from a distance and connect with huge force, often faster than you can move away.
Warning for allergy sufferers
Studies show that nickel (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or opt for coated magnets.
Implant safety
Individuals with a ICD must keep an large gap from magnets. The magnetic field can stop the functioning of the implant.
Electronic devices
Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, timepieces).
Dust explosion hazard
Powder created during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.
Keep away from electronics
An intense magnetic field disrupts the functioning of magnetometers in phones and GPS navigation. Maintain magnets close to a smartphone to prevent breaking the sensors.
Pinching danger
Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!
Maximum temperature
Avoid heat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).
Danger to the youngest
Only for adults. Tiny parts pose a choking risk, leading to intestinal necrosis. Keep away from kids and pets.
Protective goggles
Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.
Danger!
Looking for details? Read our article: Why are neodymium magnets dangerous?
