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
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Technical - 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 modeling of the product - report
These information are the outcome of a engineering analysis. Results rely on algorithms for the class Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Treat these data as a supplementary guide for designers.
Table 1: Static pull force (pull vs gap) - 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
|
critical level |
| 1 mm |
4935 Gs
493.5 mT
|
158.88 kg / 350.26 LBS
158876.4 g / 1558.6 N
|
critical level |
| 2 mm |
4790 Gs
479.0 mT
|
149.67 kg / 329.96 LBS
149666.1 g / 1468.2 N
|
critical level |
| 3 mm |
4644 Gs
464.4 mT
|
140.71 kg / 310.21 LBS
140708.8 g / 1380.4 N
|
critical level |
| 5 mm |
4354 Gs
435.4 mT
|
123.67 kg / 272.64 LBS
123667.4 g / 1213.2 N
|
critical level |
| 10 mm |
3652 Gs
365.2 mT
|
87.02 kg / 191.84 LBS
87016.1 g / 853.6 N
|
critical level |
| 15 mm |
3017 Gs
301.7 mT
|
59.37 kg / 130.88 LBS
59366.6 g / 582.4 N
|
critical level |
| 20 mm |
2469 Gs
246.9 mT
|
39.78 kg / 87.70 LBS
39781.3 g / 390.3 N
|
critical level |
| 30 mm |
1645 Gs
164.5 mT
|
17.66 kg / 38.93 LBS
17659.3 g / 173.2 N
|
critical level |
| 50 mm |
773 Gs
77.3 mT
|
3.89 kg / 8.59 LBS
3895.0 g / 38.2 N
|
strong |
Table 2: Shear force (wall)
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: Vertical assembly (shearing) - 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: Thermal stability (material behavior) - 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 (attraction) - field collision
MW 70x50 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (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: Hazards (electronics) - warnings
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 |
| Mechanical watch | 20 Gs (2.0 mT) | 24.5 cm |
| Mobile device | 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: Dynamics (cracking risk) - 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: Surface protection spec
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 (Pc)
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
*Note: On a vertical wall, the magnet holds merely approx. 20-30% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. computer 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) = 0.74
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.
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 offers
Pros as well as cons of Nd2Fe14B magnets.
Pros
- They do not lose strength, even after approximately ten years – the reduction in power is only ~1% (based on measurements),
- They do not lose their magnetic properties even under close interference source,
- By applying a shiny layer of silver, the element presents an aesthetic look,
- Magnetic induction on the working part of the magnet remains strong,
- 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...
- In view of the ability of free molding and adaptation to unique requirements, NdFeB magnets can be manufactured in a variety of forms and dimensions, which increases their versatility,
- Wide application in innovative solutions – they find application in magnetic memories, motor assemblies, advanced medical instruments, as well as complex engineering applications.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Cons
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- We suggest a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
- Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
- With mass production the cost of neodymium magnets is a challenge,
Lifting parameters
Magnetic strength at its maximum – what it depends on?
- on a plate made of structural steel, perfectly concentrating the magnetic flux
- with a cross-section minimum 10 mm
- with an polished contact surface
- with direct contact (without impurities)
- for force applied at a right angle (pull-off, not shear)
- at ambient temperature approx. 20 degrees Celsius
Key elements affecting lifting force
- Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Steel thickness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be lost to the other side.
- Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
- Surface condition – ground elements guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.
Warnings
Bodily injuries
Risk of injury: The attraction force is so immense that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.
Metal Allergy
Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, cease working with magnets and wear gloves.
Powerful field
Handle magnets with awareness. Their huge power can shock even experienced users. Stay alert and respect their force.
Product not for children
Always keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are life-threatening.
Electronic hazard
Equipment safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).
ICD Warning
Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.
Do not overheat magnets
Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.
Machining danger
Machining of neodymium magnets carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.
Impact on smartphones
GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.
Eye protection
Protect your eyes. Magnets can fracture upon violent connection, launching sharp fragments into the air. We recommend safety glasses.
