MW 80x30 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010100
GTIN/EAN: 5906301810995
Diameter Ø
80 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
1130.97 g
Magnetization Direction
↑ axial
Load capacity
170.64 kg / 1673.99 N
Magnetic Induction
371.95 mT / 3720 Gs
Coating
[NiCuNi] Nickel
415.00 ZŁ with VAT / pcs + price for transport
337.40 ZŁ net + 23% VAT / pcs
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Technical specification of the product - MW 80x30 / N38 - cylindrical magnet
Specification / characteristics - MW 80x30 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010100 |
| GTIN/EAN | 5906301810995 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 80 mm [±0,1 mm] |
| Height | 30 mm [±0,1 mm] |
| Weight | 1130.97 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 170.64 kg / 1673.99 N |
| Magnetic Induction ~ ? | 371.95 mT / 3720 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 product - technical parameters
Presented values constitute the direct effect of a engineering analysis. Results are based on models for the class Nd2Fe14B. Operational performance may deviate from the simulation results. Please consider these data as a reference point during assembly planning.
Table 1: Static force (force vs distance) - interaction chart
MW 80x30 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3719 Gs
371.9 mT
|
170.64 kg / 376.20 LBS
170640.0 g / 1674.0 N
|
dangerous! |
| 1 mm |
3643 Gs
364.3 mT
|
163.71 kg / 360.93 LBS
163714.9 g / 1606.0 N
|
dangerous! |
| 2 mm |
3563 Gs
356.3 mT
|
156.65 kg / 345.35 LBS
156647.8 g / 1536.7 N
|
dangerous! |
| 3 mm |
3482 Gs
348.2 mT
|
149.55 kg / 329.71 LBS
149554.1 g / 1467.1 N
|
dangerous! |
| 5 mm |
3314 Gs
331.4 mT
|
135.46 kg / 298.63 LBS
135457.0 g / 1328.8 N
|
dangerous! |
| 10 mm |
2880 Gs
288.0 mT
|
102.34 kg / 225.63 LBS
102343.3 g / 1004.0 N
|
dangerous! |
| 15 mm |
2457 Gs
245.7 mT
|
74.47 kg / 164.17 LBS
74468.4 g / 730.5 N
|
dangerous! |
| 20 mm |
2069 Gs
206.9 mT
|
52.79 kg / 116.38 LBS
52789.9 g / 517.9 N
|
dangerous! |
| 30 mm |
1439 Gs
143.9 mT
|
25.53 kg / 56.29 LBS
25534.0 g / 250.5 N
|
dangerous! |
| 50 mm |
704 Gs
70.4 mT
|
6.11 kg / 13.48 LBS
6115.0 g / 60.0 N
|
warning |
Table 2: Shear force (vertical surface)
MW 80x30 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
34.13 kg / 75.24 LBS
34128.0 g / 334.8 N
|
| 1 mm | Stal (~0.2) |
32.74 kg / 72.18 LBS
32742.0 g / 321.2 N
|
| 2 mm | Stal (~0.2) |
31.33 kg / 69.07 LBS
31330.0 g / 307.3 N
|
| 3 mm | Stal (~0.2) |
29.91 kg / 65.94 LBS
29910.0 g / 293.4 N
|
| 5 mm | Stal (~0.2) |
27.09 kg / 59.73 LBS
27092.0 g / 265.8 N
|
| 10 mm | Stal (~0.2) |
20.47 kg / 45.12 LBS
20468.0 g / 200.8 N
|
| 15 mm | Stal (~0.2) |
14.89 kg / 32.84 LBS
14894.0 g / 146.1 N
|
| 20 mm | Stal (~0.2) |
10.56 kg / 23.28 LBS
10558.0 g / 103.6 N
|
| 30 mm | Stal (~0.2) |
5.11 kg / 11.26 LBS
5106.0 g / 50.1 N
|
| 50 mm | Stal (~0.2) |
1.22 kg / 2.69 LBS
1222.0 g / 12.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MW 80x30 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
51.19 kg / 112.86 LBS
51192.0 g / 502.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
34.13 kg / 75.24 LBS
34128.0 g / 334.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
17.06 kg / 37.62 LBS
17064.0 g / 167.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
85.32 kg / 188.10 LBS
85320.0 g / 837.0 N
|
Table 4: Steel thickness (saturation) - power losses
MW 80x30 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
5.69 kg / 12.54 LBS
5688.0 g / 55.8 N
|
| 1 mm |
|
14.22 kg / 31.35 LBS
14220.0 g / 139.5 N
|
| 2 mm |
|
28.44 kg / 62.70 LBS
28440.0 g / 279.0 N
|
| 3 mm |
|
42.66 kg / 94.05 LBS
42660.0 g / 418.5 N
|
| 5 mm |
|
71.10 kg / 156.75 LBS
71100.0 g / 697.5 N
|
| 10 mm |
|
142.20 kg / 313.50 LBS
142200.0 g / 1395.0 N
|
| 11 mm |
|
156.42 kg / 344.85 LBS
156420.0 g / 1534.5 N
|
| 12 mm |
|
170.64 kg / 376.20 LBS
170640.0 g / 1674.0 N
|
Table 5: Thermal stability (stability) - power drop
MW 80x30 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
170.64 kg / 376.20 LBS
170640.0 g / 1674.0 N
|
OK |
| 40 °C | -2.2% |
166.89 kg / 367.92 LBS
166885.9 g / 1637.2 N
|
OK |
| 60 °C | -4.4% |
163.13 kg / 359.64 LBS
163131.8 g / 1600.3 N
|
|
| 80 °C | -6.6% |
159.38 kg / 351.37 LBS
159377.8 g / 1563.5 N
|
|
| 100 °C | -28.8% |
121.50 kg / 267.85 LBS
121495.7 g / 1191.9 N
|
Table 6: Two magnets (repulsion) - field range
MW 80x30 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
428.66 kg / 945.03 LBS
5 157 Gs
|
64.30 kg / 141.76 LBS
64299 g / 630.8 N
|
N/A |
| 1 mm |
420.08 kg / 926.12 LBS
7 364 Gs
|
63.01 kg / 138.92 LBS
63012 g / 618.1 N
|
378.07 kg / 833.51 LBS
~0 Gs
|
| 2 mm |
411.26 kg / 906.68 LBS
7 286 Gs
|
61.69 kg / 136.00 LBS
61690 g / 605.2 N
|
370.14 kg / 816.01 LBS
~0 Gs
|
| 3 mm |
402.40 kg / 887.15 LBS
7 207 Gs
|
60.36 kg / 133.07 LBS
60360 g / 592.1 N
|
362.16 kg / 798.43 LBS
~0 Gs
|
| 5 mm |
384.60 kg / 847.90 LBS
7 046 Gs
|
57.69 kg / 127.19 LBS
57690 g / 565.9 N
|
346.14 kg / 763.11 LBS
~0 Gs
|
| 10 mm |
340.28 kg / 750.18 LBS
6 627 Gs
|
51.04 kg / 112.53 LBS
51042 g / 500.7 N
|
306.25 kg / 675.17 LBS
~0 Gs
|
| 20 mm |
257.09 kg / 566.80 LBS
5 761 Gs
|
38.56 kg / 85.02 LBS
38564 g / 378.3 N
|
231.38 kg / 510.12 LBS
~0 Gs
|
| 50 mm |
92.55 kg / 204.04 LBS
3 456 Gs
|
13.88 kg / 30.61 LBS
13883 g / 136.2 N
|
83.30 kg / 183.63 LBS
~0 Gs
|
| 60 mm |
64.14 kg / 141.41 LBS
2 877 Gs
|
9.62 kg / 21.21 LBS
9622 g / 94.4 N
|
57.73 kg / 127.27 LBS
~0 Gs
|
| 70 mm |
44.44 kg / 97.98 LBS
2 395 Gs
|
6.67 kg / 14.70 LBS
6666 g / 65.4 N
|
40.00 kg / 88.18 LBS
~0 Gs
|
| 80 mm |
30.93 kg / 68.19 LBS
1 998 Gs
|
4.64 kg / 10.23 LBS
4639 g / 45.5 N
|
27.84 kg / 61.37 LBS
~0 Gs
|
| 90 mm |
21.69 kg / 47.82 LBS
1 673 Gs
|
3.25 kg / 7.17 LBS
3254 g / 31.9 N
|
19.52 kg / 43.04 LBS
~0 Gs
|
| 100 mm |
15.36 kg / 33.87 LBS
1 408 Gs
|
2.30 kg / 5.08 LBS
2304 g / 22.6 N
|
13.83 kg / 30.48 LBS
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MW 80x30 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 37.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 29.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 23.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 18.0 cm |
| Car key | 50 Gs (5.0 mT) | 16.5 cm |
| Payment card | 400 Gs (40.0 mT) | 7.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 5.5 cm |
Table 8: Dynamics (kinetic energy) - warning
MW 80x30 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.39 km/h
(4.55 m/s)
|
11.72 J | |
| 30 mm |
23.38 km/h
(6.49 m/s)
|
23.85 J | |
| 50 mm |
28.31 km/h
(7.86 m/s)
|
34.98 J | |
| 100 mm |
39.22 km/h
(10.90 m/s)
|
67.13 J |
Table 9: Coating parameters (durability)
MW 80x30 / 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 80x30 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 194 600 Mx | 1946.0 µWb |
| Pc Coefficient | 0.48 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 80x30 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 170.64 kg | Standard |
| Water (riverbed) |
195.38 kg
(+24.74 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical wall, the magnet holds only ~20% of its max power.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Power loss vs temp
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48
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.
Material specification
| 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 |
See also deals
Pros as well as cons of rare earth magnets.
Advantages
- Their magnetic field is maintained, and after around 10 years it drops only by ~1% (according to research),
- They possess excellent resistance to magnetism drop as a result of opposing magnetic fields,
- The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to present itself better,
- The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Thanks to flexibility in constructing and the capacity to modify to complex applications,
- Fundamental importance in innovative solutions – they are commonly used in mass storage devices, electric drive systems, precision medical tools, and technologically advanced constructions.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Cons
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
- NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
- Due to limitations in producing threads and complex forms in magnets, we recommend using a housing - magnetic mechanism.
- Potential hazard to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to disrupt the diagnostic process medical when they are in the body.
- Due to neodymium price, their price is relatively high,
Pull force analysis
Maximum lifting force for a neodymium magnet – what contributes to it?
- using a plate made of low-carbon steel, serving as a magnetic yoke
- possessing a thickness of min. 10 mm to avoid saturation
- with an polished contact surface
- with total lack of distance (no coatings)
- for force acting at a right angle (in the magnet axis)
- at conditions approx. 20°C
Impact of factors on magnetic holding capacity in practice
- Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be lost to the other side.
- Chemical composition of the base – mild steel gives the best results. Alloy admixtures lower magnetic properties and lifting capacity.
- Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
- Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity was assessed with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet and the plate lowers the load capacity.
H&S for magnets
Danger to pacemakers
Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.
Crushing force
Large magnets can smash fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.
Risk of cracking
Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Swallowing risk
Only for adults. Tiny parts pose a choking risk, causing serious injuries. Store out of reach of kids and pets.
Electronic devices
Avoid bringing magnets close to a purse, computer, or TV. The magnetic field can destroy these devices and erase data from cards.
Dust is flammable
Fire warning: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.
Sensitization to coating
Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation appears, cease working with magnets and use protective gear.
Maximum temperature
Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. This process is irreversible.
Handling guide
Handle with care. Rare earth magnets act from a long distance and connect with huge force, often quicker than you can react.
Keep away from electronics
A powerful magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets close to a device to avoid breaking the sensors.
