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
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
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Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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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 |
|---|---|---|
| Remanence Br ? | 12.2-12.6 | kGs |
| Remanence Br ? | 1220-1260 | mT |
| Coercivity bHc ? | 10.8-11.5 | kOe |
| Coercivity bHc ? | 860-915 | kA/m |
| Intrinsic coercivity iHc | ≥ 12 | kOe |
| Intrinsic coercivity iHc | ≥ 955 | kA/m |
| Energy product BHmax ? | 36-38 | BH max MGOe |
| Energy product BHmax ? | 287-303 | BH max KJ/m |
| Maximum working 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 - data
These information represent the result of a physical simulation. Results were calculated on models for the class Nd2Fe14B. Operational parameters may differ from theoretical values. Use these data as a preliminary roadmap when designing systems.
Table 1: Static pull force (pull 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
|
crushing |
| 1 mm |
4935 Gs
493.5 mT
|
158.88 kg / 350.26 LBS
158876.4 g / 1558.6 N
|
crushing |
| 2 mm |
4790 Gs
479.0 mT
|
149.67 kg / 329.96 LBS
149666.1 g / 1468.2 N
|
crushing |
| 3 mm |
4644 Gs
464.4 mT
|
140.71 kg / 310.21 LBS
140708.8 g / 1380.4 N
|
crushing |
| 5 mm |
4354 Gs
435.4 mT
|
123.67 kg / 272.64 LBS
123667.4 g / 1213.2 N
|
crushing |
| 10 mm |
3652 Gs
365.2 mT
|
87.02 kg / 191.84 LBS
87016.1 g / 853.6 N
|
crushing |
| 15 mm |
3017 Gs
301.7 mT
|
59.37 kg / 130.88 LBS
59366.6 g / 582.4 N
|
crushing |
| 20 mm |
2469 Gs
246.9 mT
|
39.78 kg / 87.70 LBS
39781.3 g / 390.3 N
|
crushing |
| 30 mm |
1645 Gs
164.5 mT
|
17.66 kg / 38.93 LBS
17659.3 g / 173.2 N
|
crushing |
| 50 mm |
773 Gs
77.3 mT
|
3.89 kg / 8.59 LBS
3895.0 g / 38.2 N
|
medium risk |
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: Wall mounting (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) - sheet metal selection
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 resistance (material behavior) - power drop
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: Two magnets (attraction) - 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) (implants) - 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 |
| Mechanical watch | 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: Impact energy (cracking risk) - warning
MW 70x50 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
14.84 km/h
(4.12 m/s)
|
12.26 J | |
| 30 mm |
19.37 km/h
(5.38 m/s)
|
20.89 J | |
| 50 mm |
20.17 km/h
(5.60 m/s)
|
22.65 J | |
| 100 mm |
20.42 km/h
(5.67 m/s)
|
23.23 J |
Table 9: Anti-corrosion coating 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: Electrical 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: Physics of underwater searching
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. Sliding resistance
*Note: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Thermal stability
*For standard magnets, 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
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Strengths and weaknesses of Nd2Fe14B magnets.
Advantages
- They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
- They possess excellent resistance to magnetic field loss as a result of external fields,
- Thanks to the shiny finish, the layer of nickel, gold-plated, or silver-plated gives an elegant appearance,
- Neodymium magnets generate maximum magnetic induction on a their surface, which ensures high operational effectiveness,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
- Thanks to flexibility in designing and the ability to customize to individual projects,
- Versatile presence in high-tech industry – they serve a role in HDD drives, motor assemblies, precision medical tools, also modern systems.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Limitations
- To avoid cracks under impact, we suggest 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 power (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
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
- Due to limitations in creating threads and complex shapes in magnets, we recommend using cover - magnetic mount.
- Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these devices are able to complicate diagnosis medical in case of swallowing.
- With budget limitations the cost of neodymium magnets is economically unviable,
Lifting parameters
Magnetic strength at its maximum – what contributes to it?
- using a plate made of high-permeability steel, serving as a ideal flux conductor
- with a thickness no less than 10 mm
- characterized by even structure
- without the slightest clearance between the magnet and steel
- during detachment in a direction vertical to the plane
- at standard ambient temperature
Key elements affecting lifting force
- Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Plate thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be lost to the other side.
- Metal type – not every steel attracts identically. High carbon content worsen the attraction effect.
- Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
- Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.
Warnings
Safe operation
Handle with care. Rare earth magnets attract from a distance and connect with huge force, often faster than you can react.
Implant safety
For implant holders: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.
Hand protection
Watch your fingers. Two large magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!
Cards and drives
Intense magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.
Mechanical processing
Powder created during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Warning for allergy sufferers
Certain individuals experience a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching may cause a rash. We strongly advise use safety gloves.
Product not for children
Absolutely store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are very dangerous.
Maximum temperature
Watch the temperature. Exposing the magnet to high heat will permanently weaken its properties and strength.
Precision electronics
An intense magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Keep magnets near a device to prevent breaking the sensors.
Magnets are brittle
Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.
