MW 45x30 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010073
GTIN/EAN: 5906301810728
Diameter Ø
45 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
357.85 g
Magnetization Direction
↑ axial
Load capacity
69.46 kg / 681.39 N
Magnetic Induction
495.87 mT / 4959 Gs
Coating
[NiCuNi] Nickel
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Physical properties - MW 45x30 / N38 - cylindrical magnet
Specification / characteristics - MW 45x30 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010073 |
| GTIN/EAN | 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 ~ ? | 69.46 kg / 681.39 N |
| Magnetic Induction ~ ? | 495.87 mT / 4959 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 - report
Presented data are the result of a engineering analysis. Values were calculated on algorithms for the class Nd2Fe14B. Actual parameters may differ. Please consider these data as a preliminary roadmap when designing systems.
Table 1: Static force (pull vs distance) - characteristics
MW 45x30 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4958 Gs
495.8 mT
|
69.46 kg / 153.13 pounds
69460.0 g / 681.4 N
|
critical level |
| 1 mm |
4742 Gs
474.2 mT
|
63.55 kg / 140.11 pounds
63553.9 g / 623.5 N
|
critical level |
| 2 mm |
4523 Gs
452.3 mT
|
57.81 kg / 127.44 pounds
57805.8 g / 567.1 N
|
critical level |
| 3 mm |
4303 Gs
430.3 mT
|
52.33 kg / 115.36 pounds
52327.7 g / 513.3 N
|
critical level |
| 5 mm |
3870 Gs
387.0 mT
|
42.33 kg / 93.32 pounds
42329.9 g / 415.3 N
|
critical level |
| 10 mm |
2886 Gs
288.6 mT
|
23.53 kg / 51.88 pounds
23531.8 g / 230.8 N
|
critical level |
| 15 mm |
2106 Gs
210.6 mT
|
12.54 kg / 27.64 pounds
12537.0 g / 123.0 N
|
critical level |
| 20 mm |
1535 Gs
153.5 mT
|
6.66 kg / 14.68 pounds
6657.1 g / 65.3 N
|
medium risk |
| 30 mm |
845 Gs
84.5 mT
|
2.02 kg / 4.45 pounds
2018.9 g / 19.8 N
|
medium risk |
| 50 mm |
315 Gs
31.5 mT
|
0.28 kg / 0.62 pounds
279.5 g / 2.7 N
|
safe |
Table 2: Slippage force (wall)
MW 45x30 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
13.89 kg / 30.63 pounds
13892.0 g / 136.3 N
|
| 1 mm | Stal (~0.2) |
12.71 kg / 28.02 pounds
12710.0 g / 124.7 N
|
| 2 mm | Stal (~0.2) |
11.56 kg / 25.49 pounds
11562.0 g / 113.4 N
|
| 3 mm | Stal (~0.2) |
10.47 kg / 23.07 pounds
10466.0 g / 102.7 N
|
| 5 mm | Stal (~0.2) |
8.47 kg / 18.66 pounds
8466.0 g / 83.1 N
|
| 10 mm | Stal (~0.2) |
4.71 kg / 10.37 pounds
4706.0 g / 46.2 N
|
| 15 mm | Stal (~0.2) |
2.51 kg / 5.53 pounds
2508.0 g / 24.6 N
|
| 20 mm | Stal (~0.2) |
1.33 kg / 2.94 pounds
1332.0 g / 13.1 N
|
| 30 mm | Stal (~0.2) |
0.40 kg / 0.89 pounds
404.0 g / 4.0 N
|
| 50 mm | Stal (~0.2) |
0.06 kg / 0.12 pounds
56.0 g / 0.5 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MW 45x30 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
20.84 kg / 45.94 pounds
20838.0 g / 204.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
13.89 kg / 30.63 pounds
13892.0 g / 136.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
6.95 kg / 15.31 pounds
6946.0 g / 68.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
34.73 kg / 76.57 pounds
34730.0 g / 340.7 N
|
Table 4: Steel thickness (substrate influence) - power losses
MW 45x30 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.32 kg / 5.10 pounds
2315.3 g / 22.7 N
|
| 1 mm |
|
5.79 kg / 12.76 pounds
5788.3 g / 56.8 N
|
| 2 mm |
|
11.58 kg / 25.52 pounds
11576.7 g / 113.6 N
|
| 3 mm |
|
17.37 kg / 38.28 pounds
17365.0 g / 170.4 N
|
| 5 mm |
|
28.94 kg / 63.81 pounds
28941.7 g / 283.9 N
|
| 10 mm |
|
57.88 kg / 127.61 pounds
57883.3 g / 567.8 N
|
| 11 mm |
|
63.67 kg / 140.37 pounds
63671.7 g / 624.6 N
|
| 12 mm |
|
69.46 kg / 153.13 pounds
69460.0 g / 681.4 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MW 45x30 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
69.46 kg / 153.13 pounds
69460.0 g / 681.4 N
|
OK |
| 40 °C | -2.2% |
67.93 kg / 149.76 pounds
67931.9 g / 666.4 N
|
OK |
| 60 °C | -4.4% |
66.40 kg / 146.40 pounds
66403.8 g / 651.4 N
|
OK |
| 80 °C | -6.6% |
64.88 kg / 143.03 pounds
64875.6 g / 636.4 N
|
|
| 100 °C | -28.8% |
49.46 kg / 109.03 pounds
49455.5 g / 485.2 N
|
Table 6: Two magnets (attraction) - field range
MW 45x30 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
241.01 kg / 531.33 pounds
5 803 Gs
|
36.15 kg / 79.70 pounds
36151 g / 354.6 N
|
N/A |
| 1 mm |
230.79 kg / 508.80 pounds
9 703 Gs
|
34.62 kg / 76.32 pounds
34618 g / 339.6 N
|
207.71 kg / 457.92 pounds
~0 Gs
|
| 2 mm |
220.52 kg / 486.16 pounds
9 485 Gs
|
33.08 kg / 72.92 pounds
33078 g / 324.5 N
|
198.47 kg / 437.54 pounds
~0 Gs
|
| 3 mm |
210.44 kg / 463.94 pounds
9 265 Gs
|
31.57 kg / 69.59 pounds
31566 g / 309.7 N
|
189.39 kg / 417.54 pounds
~0 Gs
|
| 5 mm |
190.94 kg / 420.95 pounds
8 826 Gs
|
28.64 kg / 63.14 pounds
28641 g / 281.0 N
|
171.85 kg / 378.86 pounds
~0 Gs
|
| 10 mm |
146.87 kg / 323.80 pounds
7 741 Gs
|
22.03 kg / 48.57 pounds
22031 g / 216.1 N
|
132.19 kg / 291.42 pounds
~0 Gs
|
| 20 mm |
81.65 kg / 180.01 pounds
5 771 Gs
|
12.25 kg / 27.00 pounds
12247 g / 120.1 N
|
73.48 kg / 162.01 pounds
~0 Gs
|
| 50 mm |
12.52 kg / 27.60 pounds
2 260 Gs
|
1.88 kg / 4.14 pounds
1878 g / 18.4 N
|
11.27 kg / 24.84 pounds
~0 Gs
|
| 60 mm |
7.01 kg / 15.44 pounds
1 690 Gs
|
1.05 kg / 2.32 pounds
1051 g / 10.3 N
|
6.30 kg / 13.90 pounds
~0 Gs
|
| 70 mm |
4.06 kg / 8.95 pounds
1 287 Gs
|
0.61 kg / 1.34 pounds
609 g / 6.0 N
|
3.66 kg / 8.06 pounds
~0 Gs
|
| 80 mm |
2.44 kg / 5.38 pounds
998 Gs
|
0.37 kg / 0.81 pounds
366 g / 3.6 N
|
2.20 kg / 4.84 pounds
~0 Gs
|
| 90 mm |
1.51 kg / 3.34 pounds
786 Gs
|
0.23 kg / 0.50 pounds
227 g / 2.2 N
|
1.36 kg / 3.01 pounds
~0 Gs
|
| 100 mm |
0.97 kg / 2.14 pounds
629 Gs
|
0.15 kg / 0.32 pounds
145 g / 1.4 N
|
0.87 kg / 1.92 pounds
~0 Gs
|
Table 7: Hazards (implants) - warnings
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 |
| Timepiece | 20 Gs (2.0 mT) | 15.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 12.0 cm |
| Car key | 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 |
Table 8: Impact energy (cracking risk) - collision effects
MW 45x30 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.76 km/h
(4.66 m/s)
|
3.88 J | |
| 30 mm |
24.77 km/h
(6.88 m/s)
|
8.47 J | |
| 50 mm |
31.50 km/h
(8.75 m/s)
|
13.70 J | |
| 100 mm |
44.44 km/h
(12.34 m/s)
|
27.26 J |
Table 9: Coating parameters (durability)
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) |
Table 10: Construction data (Flux)
MW 45x30 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 79 446 Mx | 794.5 µWb |
| Pc Coefficient | 0.71 | High (Stable) |
Table 11: Submerged application
MW 45x30 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 69.46 kg | Standard |
| Water (riverbed) |
79.53 kg
(+10.07 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Caution: On a vertical surface, the magnet holds only approx. 20-30% of its perpendicular strength.
2. Steel thickness impact
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Thermal stability
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.71
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.
Material specification
| 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 proposals
Strengths as well as weaknesses of neodymium magnets.
Pros
- They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
- They show high resistance to demagnetization induced by presence of other magnetic fields,
- The use of an refined coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- Neodymium magnets generate maximum magnetic induction on a contact point, which allows for strong attraction,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Possibility of detailed machining and adjusting to complex applications,
- Wide application in high-tech industry – they are utilized in mass storage devices, drive modules, precision medical tools, as well as technologically advanced constructions.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
- NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and 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
- They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing threads and complicated shapes in magnets, we propose using casing - magnetic mechanism.
- Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these magnets are able to complicate diagnosis medical after entering the body.
- With mass production the cost of neodymium magnets is economically unviable,
Lifting parameters
Best holding force of the magnet in ideal parameters – what contributes to it?
- on a base made of mild steel, optimally conducting the magnetic flux
- with a cross-section no less than 10 mm
- characterized by smoothness
- under conditions of no distance (metal-to-metal)
- under vertical force vector (90-degree angle)
- in temp. approx. 20°C
Practical lifting capacity: influencing factors
- Space between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Load vector – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
- Smoothness – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
- Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.
Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Precautions when working with NdFeB magnets
Beware of splinters
Despite metallic appearance, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.
Nickel allergy
Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness happens, immediately stop working with magnets and use protective gear.
Dust explosion hazard
Machining of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
Bone fractures
Large magnets can crush fingers instantly. Under no circumstances place your hand between two strong magnets.
Implant safety
Life threat: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.
No play value
Neodymium magnets are not intended for children. Swallowing a few magnets can lead to them connecting inside the digestive tract, which constitutes a critical condition and necessitates urgent medical intervention.
Safe operation
Handle magnets with awareness. Their immense force can surprise even professionals. Be vigilant and respect their power.
Do not overheat magnets
Keep cool. NdFeB magnets are susceptible to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).
GPS and phone interference
Navigation devices and smartphones are extremely susceptible to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.
Data carriers
Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.
