MW 70x60 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010098
GTIN/EAN: 5906301810971
Diameter Ø
70 mm [±0,1 mm]
Height
60 mm [±0,1 mm]
Weight
1731.8 g
Magnetization Direction
↑ axial
Load capacity
163.93 kg / 1608.16 N
Magnetic Induction
535.45 mT / 5354 Gs
Coating
[NiCuNi] Nickel
630.01 ZŁ with VAT / pcs + price for transport
512.20 ZŁ net + 23% VAT / pcs
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Technical - MW 70x60 / N38 - cylindrical magnet
Specification / characteristics - MW 70x60 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010098 |
| GTIN/EAN | 5906301810971 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 70 mm [±0,1 mm] |
| Height | 60 mm [±0,1 mm] |
| Weight | 1731.8 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 163.93 kg / 1608.16 N |
| Magnetic Induction ~ ? | 535.45 mT / 5354 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 assembly - technical parameters
These information are the result of a mathematical simulation. Results are based on models for the material Nd2Fe14B. Actual conditions might slightly differ. Please consider these calculations as a reference point during assembly planning.
Table 1: Static pull force (pull vs gap) - power drop
MW 70x60 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5354 Gs
535.4 mT
|
163.93 kg / 361.40 lbs
163930.0 g / 1608.2 N
|
crushing |
| 1 mm |
5201 Gs
520.1 mT
|
154.68 kg / 341.01 lbs
154677.8 g / 1517.4 N
|
crushing |
| 2 mm |
5045 Gs
504.5 mT
|
145.58 kg / 320.96 lbs
145583.5 g / 1428.2 N
|
crushing |
| 3 mm |
4890 Gs
489.0 mT
|
136.77 kg / 301.52 lbs
136769.5 g / 1341.7 N
|
crushing |
| 5 mm |
4582 Gs
458.2 mT
|
120.07 kg / 264.72 lbs
120074.6 g / 1177.9 N
|
crushing |
| 10 mm |
3842 Gs
384.2 mT
|
84.43 kg / 186.13 lbs
84425.8 g / 828.2 N
|
crushing |
| 15 mm |
3176 Gs
317.6 mT
|
57.69 kg / 127.18 lbs
57688.8 g / 565.9 N
|
crushing |
| 20 mm |
2604 Gs
260.4 mT
|
38.78 kg / 85.50 lbs
38782.9 g / 380.5 N
|
crushing |
| 30 mm |
1744 Gs
174.4 mT
|
17.39 kg / 38.33 lbs
17385.0 g / 170.5 N
|
crushing |
| 50 mm |
829 Gs
82.9 mT
|
3.93 kg / 8.66 lbs
3929.4 g / 38.5 N
|
medium risk |
Table 2: Shear force (wall)
MW 70x60 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
32.79 kg / 72.28 lbs
32786.0 g / 321.6 N
|
| 1 mm | Stal (~0.2) |
30.94 kg / 68.20 lbs
30936.0 g / 303.5 N
|
| 2 mm | Stal (~0.2) |
29.12 kg / 64.19 lbs
29116.0 g / 285.6 N
|
| 3 mm | Stal (~0.2) |
27.35 kg / 60.31 lbs
27354.0 g / 268.3 N
|
| 5 mm | Stal (~0.2) |
24.01 kg / 52.94 lbs
24014.0 g / 235.6 N
|
| 10 mm | Stal (~0.2) |
16.89 kg / 37.23 lbs
16886.0 g / 165.7 N
|
| 15 mm | Stal (~0.2) |
11.54 kg / 25.44 lbs
11538.0 g / 113.2 N
|
| 20 mm | Stal (~0.2) |
7.76 kg / 17.10 lbs
7756.0 g / 76.1 N
|
| 30 mm | Stal (~0.2) |
3.48 kg / 7.67 lbs
3478.0 g / 34.1 N
|
| 50 mm | Stal (~0.2) |
0.79 kg / 1.73 lbs
786.0 g / 7.7 N
|
Table 3: Wall mounting (shearing) - vertical pull
MW 70x60 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
49.18 kg / 108.42 lbs
49179.0 g / 482.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
32.79 kg / 72.28 lbs
32786.0 g / 321.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
16.39 kg / 36.14 lbs
16393.0 g / 160.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
81.97 kg / 180.70 lbs
81965.0 g / 804.1 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 70x60 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
5.46 kg / 12.05 lbs
5464.3 g / 53.6 N
|
| 1 mm |
|
13.66 kg / 30.12 lbs
13660.8 g / 134.0 N
|
| 2 mm |
|
27.32 kg / 60.23 lbs
27321.7 g / 268.0 N
|
| 3 mm |
|
40.98 kg / 90.35 lbs
40982.5 g / 402.0 N
|
| 5 mm |
|
68.30 kg / 150.58 lbs
68304.2 g / 670.1 N
|
| 10 mm |
|
136.61 kg / 301.17 lbs
136608.3 g / 1340.1 N
|
| 11 mm |
|
150.27 kg / 331.29 lbs
150269.2 g / 1474.1 N
|
| 12 mm |
|
163.93 kg / 361.40 lbs
163930.0 g / 1608.2 N
|
Table 5: Thermal stability (stability) - resistance threshold
MW 70x60 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
163.93 kg / 361.40 lbs
163930.0 g / 1608.2 N
|
OK |
| 40 °C | -2.2% |
160.32 kg / 353.45 lbs
160323.5 g / 1572.8 N
|
OK |
| 60 °C | -4.4% |
156.72 kg / 345.50 lbs
156717.1 g / 1537.4 N
|
OK |
| 80 °C | -6.6% |
153.11 kg / 337.55 lbs
153110.6 g / 1502.0 N
|
|
| 100 °C | -28.8% |
116.72 kg / 257.32 lbs
116718.2 g / 1145.0 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MW 70x60 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
680.08 kg / 1499.31 lbs
5 950 Gs
|
102.01 kg / 224.90 lbs
102012 g / 1000.7 N
|
N/A |
| 1 mm |
660.96 kg / 1457.16 lbs
10 556 Gs
|
99.14 kg / 218.57 lbs
99144 g / 972.6 N
|
594.86 kg / 1311.45 lbs
~0 Gs
|
| 2 mm |
641.69 kg / 1414.69 lbs
10 401 Gs
|
96.25 kg / 212.20 lbs
96254 g / 944.3 N
|
577.52 kg / 1273.22 lbs
~0 Gs
|
| 3 mm |
622.69 kg / 1372.80 lbs
10 246 Gs
|
93.40 kg / 205.92 lbs
93404 g / 916.3 N
|
560.42 kg / 1235.52 lbs
~0 Gs
|
| 5 mm |
585.53 kg / 1290.87 lbs
9 936 Gs
|
87.83 kg / 193.63 lbs
87830 g / 861.6 N
|
526.98 kg / 1161.79 lbs
~0 Gs
|
| 10 mm |
498.14 kg / 1098.21 lbs
9 164 Gs
|
74.72 kg / 164.73 lbs
74721 g / 733.0 N
|
448.33 kg / 988.39 lbs
~0 Gs
|
| 20 mm |
350.25 kg / 772.16 lbs
7 684 Gs
|
52.54 kg / 115.82 lbs
52537 g / 515.4 N
|
315.22 kg / 694.95 lbs
~0 Gs
|
| 50 mm |
107.57 kg / 237.16 lbs
4 259 Gs
|
16.14 kg / 35.57 lbs
16136 g / 158.3 N
|
96.82 kg / 213.44 lbs
~0 Gs
|
| 60 mm |
72.12 kg / 159.00 lbs
3 487 Gs
|
10.82 kg / 23.85 lbs
10818 g / 106.1 N
|
64.91 kg / 143.10 lbs
~0 Gs
|
| 70 mm |
48.77 kg / 107.51 lbs
2 867 Gs
|
7.31 kg / 16.13 lbs
7315 g / 71.8 N
|
43.89 kg / 96.76 lbs
~0 Gs
|
| 80 mm |
33.37 kg / 73.57 lbs
2 372 Gs
|
5.01 kg / 11.04 lbs
5005 g / 49.1 N
|
30.03 kg / 66.21 lbs
~0 Gs
|
| 90 mm |
23.15 kg / 51.04 lbs
1 976 Gs
|
3.47 kg / 7.66 lbs
3473 g / 34.1 N
|
20.84 kg / 45.94 lbs
~0 Gs
|
| 100 mm |
16.30 kg / 35.94 lbs
1 658 Gs
|
2.45 kg / 5.39 lbs
2445 g / 24.0 N
|
14.67 kg / 32.34 lbs
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MW 70x60 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 42.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 33.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 25.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 19.5 cm |
| Remote | 50 Gs (5.0 mT) | 18.0 cm |
| Payment card | 400 Gs (40.0 mT) | 7.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 6.0 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MW 70x60 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
12.58 km/h
(3.49 m/s)
|
10.57 J | |
| 30 mm |
18.09 km/h
(5.02 m/s)
|
21.86 J | |
| 50 mm |
22.27 km/h
(6.19 m/s)
|
33.13 J | |
| 100 mm |
31.06 km/h
(8.63 m/s)
|
64.44 J |
Table 9: Anti-corrosion coating durability
MW 70x60 / 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 (Pc)
MW 70x60 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 209 626 Mx | 2096.3 µWb |
| Pc Coefficient | 0.82 | High (Stable) |
Table 11: Submerged application
MW 70x60 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 163.93 kg | Standard |
| Water (riverbed) |
187.70 kg
(+23.77 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical wall, the magnet holds just a fraction of its perpendicular strength.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Thermal stability
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.82
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Strengths and weaknesses of neodymium magnets.
Advantages
- They do not lose power, even during nearly 10 years – the reduction in power is only ~1% (based on measurements),
- Neodymium magnets are characterized by exceptionally resistant to magnetic field loss caused by magnetic disturbances,
- The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to present itself better,
- They are known for high magnetic induction at the operating surface, which increases their power,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Due to the possibility of free molding and adaptation to specialized needs, magnetic components can be produced in a wide range of geometric configurations, which expands the range of possible applications,
- Versatile presence in future technologies – they find application in computer drives, electric drive systems, medical equipment, also multitasking production systems.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Disadvantages
- At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets decrease 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 stability even at temperatures up to 230°C
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- Limited possibility of making nuts in the magnet and complicated shapes - preferred is a housing - magnetic holder.
- Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these devices can complicate diagnosis medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Maximum lifting force for a neodymium magnet – what contributes to it?
- on a base made of mild steel, perfectly concentrating the magnetic field
- with a cross-section minimum 10 mm
- with an ideally smooth touching surface
- under conditions of no distance (surface-to-surface)
- for force acting at a right angle (pull-off, not shear)
- at temperature room level
Magnet lifting force in use – key factors
- Gap (between the magnet and the plate), since even a very small distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
- Load vector – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
- Steel thickness – too thin sheet does not close the flux, causing part of the power to be wasted to the other side.
- Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
- Surface finish – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
- Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate decreases the lifting capacity.
Safety rules for work with NdFeB magnets
Beware of splinters
NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets will cause them breaking into small pieces.
Heat sensitivity
Do not overheat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).
Physical harm
Big blocks can crush fingers instantly. Never place your hand between two strong magnets.
Magnetic media
Avoid bringing magnets near a purse, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Safe operation
Use magnets consciously. Their huge power can surprise even professionals. Be vigilant and respect their power.
Impact on smartphones
GPS units and mobile phones are highly sensitive to magnetism. Close proximity with a strong magnet can permanently damage the sensors in your phone.
Swallowing risk
Absolutely keep magnets away from children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are very dangerous.
Dust is flammable
Dust generated during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Metal Allergy
Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction occurs, cease working with magnets and use protective gear.
Medical interference
People with a ICD have to keep an large gap from magnets. The magnetism can interfere with the operation of the life-saving device.
