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 parameters - 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 analysis of the assembly - technical parameters
Presented data represent the direct effect of a physical analysis. Results were calculated on models for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Treat these data as a preliminary roadmap for designers.
Table 1: Static force (pull vs distance) - characteristics
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 pounds
163930.0 g / 1608.2 N
|
dangerous! |
| 1 mm |
5201 Gs
520.1 mT
|
154.68 kg / 341.01 pounds
154677.8 g / 1517.4 N
|
dangerous! |
| 2 mm |
5045 Gs
504.5 mT
|
145.58 kg / 320.96 pounds
145583.5 g / 1428.2 N
|
dangerous! |
| 3 mm |
4890 Gs
489.0 mT
|
136.77 kg / 301.52 pounds
136769.5 g / 1341.7 N
|
dangerous! |
| 5 mm |
4582 Gs
458.2 mT
|
120.07 kg / 264.72 pounds
120074.6 g / 1177.9 N
|
dangerous! |
| 10 mm |
3842 Gs
384.2 mT
|
84.43 kg / 186.13 pounds
84425.8 g / 828.2 N
|
dangerous! |
| 15 mm |
3176 Gs
317.6 mT
|
57.69 kg / 127.18 pounds
57688.8 g / 565.9 N
|
dangerous! |
| 20 mm |
2604 Gs
260.4 mT
|
38.78 kg / 85.50 pounds
38782.9 g / 380.5 N
|
dangerous! |
| 30 mm |
1744 Gs
174.4 mT
|
17.39 kg / 38.33 pounds
17385.0 g / 170.5 N
|
dangerous! |
| 50 mm |
829 Gs
82.9 mT
|
3.93 kg / 8.66 pounds
3929.4 g / 38.5 N
|
strong |
Table 2: Slippage force (vertical surface)
MW 70x60 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
32.79 kg / 72.28 pounds
32786.0 g / 321.6 N
|
| 1 mm | Stal (~0.2) |
30.94 kg / 68.20 pounds
30936.0 g / 303.5 N
|
| 2 mm | Stal (~0.2) |
29.12 kg / 64.19 pounds
29116.0 g / 285.6 N
|
| 3 mm | Stal (~0.2) |
27.35 kg / 60.31 pounds
27354.0 g / 268.3 N
|
| 5 mm | Stal (~0.2) |
24.01 kg / 52.94 pounds
24014.0 g / 235.6 N
|
| 10 mm | Stal (~0.2) |
16.89 kg / 37.23 pounds
16886.0 g / 165.7 N
|
| 15 mm | Stal (~0.2) |
11.54 kg / 25.44 pounds
11538.0 g / 113.2 N
|
| 20 mm | Stal (~0.2) |
7.76 kg / 17.10 pounds
7756.0 g / 76.1 N
|
| 30 mm | Stal (~0.2) |
3.48 kg / 7.67 pounds
3478.0 g / 34.1 N
|
| 50 mm | Stal (~0.2) |
0.79 kg / 1.73 pounds
786.0 g / 7.7 N
|
Table 3: Vertical assembly (sliding) - 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 pounds
49179.0 g / 482.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
32.79 kg / 72.28 pounds
32786.0 g / 321.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
16.39 kg / 36.14 pounds
16393.0 g / 160.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
81.97 kg / 180.70 pounds
81965.0 g / 804.1 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MW 70x60 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
5.46 kg / 12.05 pounds
5464.3 g / 53.6 N
|
| 1 mm |
|
13.66 kg / 30.12 pounds
13660.8 g / 134.0 N
|
| 2 mm |
|
27.32 kg / 60.23 pounds
27321.7 g / 268.0 N
|
| 3 mm |
|
40.98 kg / 90.35 pounds
40982.5 g / 402.0 N
|
| 5 mm |
|
68.30 kg / 150.58 pounds
68304.2 g / 670.1 N
|
| 10 mm |
|
136.61 kg / 301.17 pounds
136608.3 g / 1340.1 N
|
| 11 mm |
|
150.27 kg / 331.29 pounds
150269.2 g / 1474.1 N
|
| 12 mm |
|
163.93 kg / 361.40 pounds
163930.0 g / 1608.2 N
|
Table 5: Thermal stability (stability) - power drop
MW 70x60 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
163.93 kg / 361.40 pounds
163930.0 g / 1608.2 N
|
OK |
| 40 °C | -2.2% |
160.32 kg / 353.45 pounds
160323.5 g / 1572.8 N
|
OK |
| 60 °C | -4.4% |
156.72 kg / 345.50 pounds
156717.1 g / 1537.4 N
|
OK |
| 80 °C | -6.6% |
153.11 kg / 337.55 pounds
153110.6 g / 1502.0 N
|
|
| 100 °C | -28.8% |
116.72 kg / 257.32 pounds
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 pounds
5 950 Gs
|
102.01 kg / 224.90 pounds
102012 g / 1000.7 N
|
N/A |
| 1 mm |
660.96 kg / 1457.16 pounds
10 556 Gs
|
99.14 kg / 218.57 pounds
99144 g / 972.6 N
|
594.86 kg / 1311.45 pounds
~0 Gs
|
| 2 mm |
641.69 kg / 1414.69 pounds
10 401 Gs
|
96.25 kg / 212.20 pounds
96254 g / 944.3 N
|
577.52 kg / 1273.22 pounds
~0 Gs
|
| 3 mm |
622.69 kg / 1372.80 pounds
10 246 Gs
|
93.40 kg / 205.92 pounds
93404 g / 916.3 N
|
560.42 kg / 1235.52 pounds
~0 Gs
|
| 5 mm |
585.53 kg / 1290.87 pounds
9 936 Gs
|
87.83 kg / 193.63 pounds
87830 g / 861.6 N
|
526.98 kg / 1161.79 pounds
~0 Gs
|
| 10 mm |
498.14 kg / 1098.21 pounds
9 164 Gs
|
74.72 kg / 164.73 pounds
74721 g / 733.0 N
|
448.33 kg / 988.39 pounds
~0 Gs
|
| 20 mm |
350.25 kg / 772.16 pounds
7 684 Gs
|
52.54 kg / 115.82 pounds
52537 g / 515.4 N
|
315.22 kg / 694.95 pounds
~0 Gs
|
| 50 mm |
107.57 kg / 237.16 pounds
4 259 Gs
|
16.14 kg / 35.57 pounds
16136 g / 158.3 N
|
96.82 kg / 213.44 pounds
~0 Gs
|
| 60 mm |
72.12 kg / 159.00 pounds
3 487 Gs
|
10.82 kg / 23.85 pounds
10818 g / 106.1 N
|
64.91 kg / 143.10 pounds
~0 Gs
|
| 70 mm |
48.77 kg / 107.51 pounds
2 867 Gs
|
7.31 kg / 16.13 pounds
7315 g / 71.8 N
|
43.89 kg / 96.76 pounds
~0 Gs
|
| 80 mm |
33.37 kg / 73.57 pounds
2 372 Gs
|
5.01 kg / 11.04 pounds
5005 g / 49.1 N
|
30.03 kg / 66.21 pounds
~0 Gs
|
| 90 mm |
23.15 kg / 51.04 pounds
1 976 Gs
|
3.47 kg / 7.66 pounds
3473 g / 34.1 N
|
20.84 kg / 45.94 pounds
~0 Gs
|
| 100 mm |
16.30 kg / 35.94 pounds
1 658 Gs
|
2.45 kg / 5.39 pounds
2445 g / 24.0 N
|
14.67 kg / 32.34 pounds
~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 |
| Phone / Smartphone | 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) - warning
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: Coating parameters (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 (Flux)
MW 70x60 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 209 626 Mx | 2096.3 µWb |
| Pc Coefficient | 0.82 | High (Stable) |
Table 11: Hydrostatics and buoyancy
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
*Warning: On a vertical wall, the magnet retains merely approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. computer case) drastically limits the holding force.
3. Thermal stability
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.82
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Advantages and disadvantages of rare earth magnets.
Pros
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
- They are resistant to demagnetization induced by external magnetic fields,
- The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to present itself better,
- They feature high magnetic induction at the operating surface, making them more effective,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of detailed modeling as well as adapting to complex applications,
- Universal use in high-tech industry – they are used in mass storage devices, brushless drives, precision medical tools, and complex engineering applications.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Weaknesses
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
- Neodymium magnets decrease their strength 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
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest 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 propose using a housing - magnetic mechanism.
- Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small elements of these magnets are able to be problematic in diagnostics medical after entering the body.
- With budget limitations the cost of neodymium magnets is economically unviable,
Lifting parameters
Maximum holding power of the magnet – what contributes to it?
- with the contact of a sheet made of special test steel, ensuring maximum field concentration
- whose thickness is min. 10 mm
- with an ground contact surface
- under conditions of no distance (metal-to-metal)
- during pulling in a direction perpendicular to the plane
- at conditions approx. 20°C
Impact of factors on magnetic holding capacity in practice
- Gap (betwixt the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
- Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Chemical composition of the base – mild steel attracts best. Alloy steels lower magnetic permeability and holding force.
- Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
- Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).
Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Safety rules for work with NdFeB magnets
Eye protection
Neodymium magnets are ceramic materials, meaning they are very brittle. Collision of two magnets will cause them breaking into small pieces.
Compass and GPS
GPS units and smartphones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.
Heat sensitivity
Regular neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.
Bodily injuries
Mind your fingers. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!
Danger to pacemakers
Medical warning: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.
Avoid contact if allergic
It is widely known that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands or choose coated magnets.
Handling rules
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.
Flammability
Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.
Choking Hazard
Strictly store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are life-threatening.
Electronic hazard
Data protection: Strong magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, timepieces).
