MW 70x50 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010496
GTIN/EAN: 5906301811145
Diameter Ø
70 mm [±0,1 mm]
Height
50 mm [±0,1 mm]
Weight
1443.17 g
Magnetization Direction
↑ axial
Load capacity
168.21 kg / 1650.14 N
Magnetic Induction
507.83 mT / 5078 Gs
Coating
[NiCuNi] Nickel
516.60 ZŁ with VAT / pcs + price for transport
420.00 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - MW 70x50 / N38 - cylindrical magnet
Specification / characteristics - MW 70x50 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010496 |
| GTIN/EAN | 5906301811145 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 70 mm [±0,1 mm] |
| Height | 50 mm [±0,1 mm] |
| Weight | 1443.17 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 168.21 kg / 1650.14 N |
| Magnetic Induction ~ ? | 507.83 mT / 5078 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 |
Engineering simulation of the assembly - report
These information represent the result of a mathematical calculation. Values rely on models for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Use these calculations as a supplementary guide during assembly planning.
Table 1: Static force (force vs distance) - power drop
MW 70x50 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5078 Gs
507.8 mT
|
168.21 kg / 370.84 LBS
168210.0 g / 1650.1 N
|
dangerous! |
| 1 mm |
4935 Gs
493.5 mT
|
158.88 kg / 350.26 LBS
158876.4 g / 1558.6 N
|
dangerous! |
| 2 mm |
4790 Gs
479.0 mT
|
149.67 kg / 329.96 LBS
149666.1 g / 1468.2 N
|
dangerous! |
| 3 mm |
4644 Gs
464.4 mT
|
140.71 kg / 310.21 LBS
140708.8 g / 1380.4 N
|
dangerous! |
| 5 mm |
4354 Gs
435.4 mT
|
123.67 kg / 272.64 LBS
123667.4 g / 1213.2 N
|
dangerous! |
| 10 mm |
3652 Gs
365.2 mT
|
87.02 kg / 191.84 LBS
87016.1 g / 853.6 N
|
dangerous! |
| 15 mm |
3017 Gs
301.7 mT
|
59.37 kg / 130.88 LBS
59366.6 g / 582.4 N
|
dangerous! |
| 20 mm |
2469 Gs
246.9 mT
|
39.78 kg / 87.70 LBS
39781.3 g / 390.3 N
|
dangerous! |
| 30 mm |
1645 Gs
164.5 mT
|
17.66 kg / 38.93 LBS
17659.3 g / 173.2 N
|
dangerous! |
| 50 mm |
773 Gs
77.3 mT
|
3.89 kg / 8.59 LBS
3895.0 g / 38.2 N
|
warning |
Table 2: Shear capacity (vertical surface)
MW 70x50 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
33.64 kg / 74.17 LBS
33642.0 g / 330.0 N
|
| 1 mm | Stal (~0.2) |
31.78 kg / 70.05 LBS
31776.0 g / 311.7 N
|
| 2 mm | Stal (~0.2) |
29.93 kg / 65.99 LBS
29934.0 g / 293.7 N
|
| 3 mm | Stal (~0.2) |
28.14 kg / 62.04 LBS
28142.0 g / 276.1 N
|
| 5 mm | Stal (~0.2) |
24.73 kg / 54.53 LBS
24734.0 g / 242.6 N
|
| 10 mm | Stal (~0.2) |
17.40 kg / 38.37 LBS
17404.0 g / 170.7 N
|
| 15 mm | Stal (~0.2) |
11.87 kg / 26.18 LBS
11874.0 g / 116.5 N
|
| 20 mm | Stal (~0.2) |
7.96 kg / 17.54 LBS
7956.0 g / 78.0 N
|
| 30 mm | Stal (~0.2) |
3.53 kg / 7.79 LBS
3532.0 g / 34.6 N
|
| 50 mm | Stal (~0.2) |
0.78 kg / 1.72 LBS
778.0 g / 7.6 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 70x50 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
50.46 kg / 111.25 LBS
50463.0 g / 495.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
33.64 kg / 74.17 LBS
33642.0 g / 330.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
16.82 kg / 37.08 LBS
16821.0 g / 165.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
84.11 kg / 185.42 LBS
84105.0 g / 825.1 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 70x50 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
5.61 kg / 12.36 LBS
5607.0 g / 55.0 N
|
| 1 mm |
|
14.02 kg / 30.90 LBS
14017.5 g / 137.5 N
|
| 2 mm |
|
28.03 kg / 61.81 LBS
28035.0 g / 275.0 N
|
| 3 mm |
|
42.05 kg / 92.71 LBS
42052.5 g / 412.5 N
|
| 5 mm |
|
70.09 kg / 154.52 LBS
70087.5 g / 687.6 N
|
| 10 mm |
|
140.18 kg / 309.03 LBS
140175.0 g / 1375.1 N
|
| 11 mm |
|
154.19 kg / 339.94 LBS
154192.5 g / 1512.6 N
|
| 12 mm |
|
168.21 kg / 370.84 LBS
168210.0 g / 1650.1 N
|
Table 5: Working in heat (stability) - resistance threshold
MW 70x50 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
168.21 kg / 370.84 LBS
168210.0 g / 1650.1 N
|
OK |
| 40 °C | -2.2% |
164.51 kg / 362.68 LBS
164509.4 g / 1613.8 N
|
OK |
| 60 °C | -4.4% |
160.81 kg / 354.52 LBS
160808.8 g / 1577.5 N
|
OK |
| 80 °C | -6.6% |
157.11 kg / 346.36 LBS
157108.1 g / 1541.2 N
|
|
| 100 °C | -28.8% |
119.77 kg / 264.04 LBS
119765.5 g / 1174.9 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 70x50 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
611.75 kg / 1348.67 LBS
5 850 Gs
|
91.76 kg / 202.30 LBS
91762 g / 900.2 N
|
N/A |
| 1 mm |
594.86 kg / 1311.43 LBS
10 014 Gs
|
89.23 kg / 196.72 LBS
89229 g / 875.3 N
|
535.37 kg / 1180.29 LBS
~0 Gs
|
| 2 mm |
577.80 kg / 1273.84 LBS
9 870 Gs
|
86.67 kg / 191.08 LBS
86670 g / 850.2 N
|
520.02 kg / 1146.45 LBS
~0 Gs
|
| 3 mm |
560.95 kg / 1236.68 LBS
9 725 Gs
|
84.14 kg / 185.50 LBS
84142 g / 825.4 N
|
504.85 kg / 1113.01 LBS
~0 Gs
|
| 5 mm |
527.90 kg / 1163.81 LBS
9 434 Gs
|
79.18 kg / 174.57 LBS
79184 g / 776.8 N
|
475.11 kg / 1047.43 LBS
~0 Gs
|
| 10 mm |
449.75 kg / 991.54 LBS
8 708 Gs
|
67.46 kg / 148.73 LBS
67463 g / 661.8 N
|
404.78 kg / 892.38 LBS
~0 Gs
|
| 20 mm |
316.46 kg / 697.68 LBS
7 304 Gs
|
47.47 kg / 104.65 LBS
47469 g / 465.7 N
|
284.81 kg / 627.91 LBS
~0 Gs
|
| 50 mm |
96.30 kg / 212.30 LBS
4 029 Gs
|
14.44 kg / 31.85 LBS
14445 g / 141.7 N
|
86.67 kg / 191.07 LBS
~0 Gs
|
| 60 mm |
64.22 kg / 141.59 LBS
3 291 Gs
|
9.63 kg / 21.24 LBS
9634 g / 94.5 N
|
57.80 kg / 127.43 LBS
~0 Gs
|
| 70 mm |
43.17 kg / 95.18 LBS
2 698 Gs
|
6.48 kg / 14.28 LBS
6476 g / 63.5 N
|
38.86 kg / 85.66 LBS
~0 Gs
|
| 80 mm |
29.36 kg / 64.73 LBS
2 225 Gs
|
4.40 kg / 9.71 LBS
4404 g / 43.2 N
|
26.43 kg / 58.26 LBS
~0 Gs
|
| 90 mm |
20.25 kg / 44.63 LBS
1 847 Gs
|
3.04 kg / 6.69 LBS
3037 g / 29.8 N
|
18.22 kg / 40.17 LBS
~0 Gs
|
| 100 mm |
14.17 kg / 31.23 LBS
1 545 Gs
|
2.12 kg / 4.68 LBS
2125 g / 20.8 N
|
12.75 kg / 28.11 LBS
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MW 70x50 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 40.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 31.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 24.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 19.0 cm |
| Car key | 50 Gs (5.0 mT) | 17.5 cm |
| Payment card | 400 Gs (40.0 mT) | 7.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 6.0 cm |
Table 8: Collisions (kinetic energy) - warning
MW 70x50 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
13.97 km/h
(3.88 m/s)
|
10.87 J | |
| 30 mm |
20.06 km/h
(5.57 m/s)
|
22.40 J | |
| 50 mm |
24.70 km/h
(6.86 m/s)
|
33.96 J | |
| 100 mm |
34.46 km/h
(9.57 m/s)
|
66.12 J |
Table 9: Coating parameters (durability)
MW 70x50 / 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 70x50 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 197 145 Mx | 1971.5 µWb |
| Pc Coefficient | 0.74 | High (Stable) |
Table 11: Submerged application
MW 70x50 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 168.21 kg | Standard |
| Water (riverbed) |
192.60 kg
(+24.39 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical wall, the magnet holds just ~20% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Temperature resistance
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.74
The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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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Advantages and disadvantages of Nd2Fe14B magnets.
Advantages
- Their strength is durable, and after approximately ten years it decreases only by ~1% (according to research),
- They feature excellent resistance to magnetic field loss as a result of external fields,
- Thanks to the metallic finish, the surface of nickel, gold-plated, or silver gives an elegant appearance,
- Magnetic induction on the working layer of the magnet turns out to be maximum,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Thanks to modularity in forming and the capacity to customize to client solutions,
- Universal use in future technologies – they serve a role in data components, electric motors, diagnostic systems, as well as complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Disadvantages
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- NdFeB magnets lose force 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
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- Limited possibility of producing threads in the magnet and complicated forms - recommended is a housing - mounting mechanism.
- Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- Due to complex production process, their price is relatively high,
Pull force analysis
Maximum holding power of the magnet – what contributes to it?
- using a plate made of low-carbon steel, serving as a magnetic yoke
- whose thickness equals approx. 10 mm
- with a plane cleaned and smooth
- with zero gap (without impurities)
- under axial application of breakaway force (90-degree angle)
- in temp. approx. 20°C
Lifting capacity in practice – influencing factors
- Air gap (between the magnet and the metal), because even a very small distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to varnish, rust or dirt).
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
- Material type – the best choice is high-permeability steel. Stainless steels may attract less.
- Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
- Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.
Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance between the magnet and the plate decreases the holding force.
Precautions when working with NdFeB magnets
Physical harm
Pinching hazard: The pulling power is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.
Nickel allergy
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, immediately stop working with magnets and wear gloves.
Keep away from electronics
Remember: rare earth magnets generate a field that confuses precision electronics. Maintain a separation from your phone, tablet, and GPS.
Handling guide
Use magnets consciously. Their huge power can surprise even experienced users. Plan your moves and do not underestimate their force.
Implant safety
Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.
Demagnetization risk
Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. The loss of strength is permanent.
Data carriers
Very strong magnetic fields can erase data on credit cards, HDDs, and storage devices. Keep a distance of min. 10 cm.
Choking Hazard
Product intended for adults. Tiny parts pose a choking risk, causing intestinal necrosis. Store out of reach of kids and pets.
Combustion hazard
Mechanical processing of neodymium magnets poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.
Magnet fragility
Despite metallic appearance, the material is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.
