MW 18x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010401
GTIN/EAN: 5906301811107
Diameter Ø
18 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
19.09 g
Magnetization Direction
↑ axial
Load capacity
10.76 kg / 105.51 N
Magnetic Induction
460.54 mT / 4605 Gs
Coating
[NiCuNi] Nickel
7.82 ZŁ with VAT / pcs + price for transport
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Technical - MW 18x10 / N38 - cylindrical magnet
Specification / characteristics - MW 18x10 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010401 |
| GTIN/EAN | 5906301811107 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 18 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 19.09 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 10.76 kg / 105.51 N |
| Magnetic Induction ~ ? | 460.54 mT / 4605 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 magnet - report
The following data constitute the result of a physical simulation. Results rely on models for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap during assembly planning.
Table 1: Static pull force (pull vs gap) - characteristics
MW 18x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4604 Gs
460.4 mT
|
10.76 kg / 23.72 LBS
10760.0 g / 105.6 N
|
critical level |
| 1 mm |
4114 Gs
411.4 mT
|
8.59 kg / 18.94 LBS
8592.4 g / 84.3 N
|
medium risk |
| 2 mm |
3615 Gs
361.5 mT
|
6.64 kg / 14.63 LBS
6635.0 g / 65.1 N
|
medium risk |
| 3 mm |
3137 Gs
313.7 mT
|
5.00 kg / 11.01 LBS
4996.2 g / 49.0 N
|
medium risk |
| 5 mm |
2305 Gs
230.5 mT
|
2.70 kg / 5.95 LBS
2698.6 g / 26.5 N
|
medium risk |
| 10 mm |
1045 Gs
104.5 mT
|
0.55 kg / 1.22 LBS
555.0 g / 5.4 N
|
low risk |
| 15 mm |
517 Gs
51.7 mT
|
0.14 kg / 0.30 LBS
135.7 g / 1.3 N
|
low risk |
| 20 mm |
285 Gs
28.5 mT
|
0.04 kg / 0.09 LBS
41.1 g / 0.4 N
|
low risk |
| 30 mm |
110 Gs
11.0 mT
|
0.01 kg / 0.01 LBS
6.2 g / 0.1 N
|
low risk |
| 50 mm |
29 Gs
2.9 mT
|
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
|
low risk |
Table 2: Shear force (vertical surface)
MW 18x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.15 kg / 4.74 LBS
2152.0 g / 21.1 N
|
| 1 mm | Stal (~0.2) |
1.72 kg / 3.79 LBS
1718.0 g / 16.9 N
|
| 2 mm | Stal (~0.2) |
1.33 kg / 2.93 LBS
1328.0 g / 13.0 N
|
| 3 mm | Stal (~0.2) |
1.00 kg / 2.20 LBS
1000.0 g / 9.8 N
|
| 5 mm | Stal (~0.2) |
0.54 kg / 1.19 LBS
540.0 g / 5.3 N
|
| 10 mm | Stal (~0.2) |
0.11 kg / 0.24 LBS
110.0 g / 1.1 N
|
| 15 mm | Stal (~0.2) |
0.03 kg / 0.06 LBS
28.0 g / 0.3 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 0.02 LBS
8.0 g / 0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MW 18x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
3.23 kg / 7.12 LBS
3228.0 g / 31.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.15 kg / 4.74 LBS
2152.0 g / 21.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.08 kg / 2.37 LBS
1076.0 g / 10.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
5.38 kg / 11.86 LBS
5380.0 g / 52.8 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 18x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.54 kg / 1.19 LBS
538.0 g / 5.3 N
|
| 1 mm |
|
1.35 kg / 2.97 LBS
1345.0 g / 13.2 N
|
| 2 mm |
|
2.69 kg / 5.93 LBS
2690.0 g / 26.4 N
|
| 3 mm |
|
4.04 kg / 8.90 LBS
4035.0 g / 39.6 N
|
| 5 mm |
|
6.73 kg / 14.83 LBS
6725.0 g / 66.0 N
|
| 10 mm |
|
10.76 kg / 23.72 LBS
10760.0 g / 105.6 N
|
| 11 mm |
|
10.76 kg / 23.72 LBS
10760.0 g / 105.6 N
|
| 12 mm |
|
10.76 kg / 23.72 LBS
10760.0 g / 105.6 N
|
Table 5: Thermal stability (stability) - resistance threshold
MW 18x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
10.76 kg / 23.72 LBS
10760.0 g / 105.6 N
|
OK |
| 40 °C | -2.2% |
10.52 kg / 23.20 LBS
10523.3 g / 103.2 N
|
OK |
| 60 °C | -4.4% |
10.29 kg / 22.68 LBS
10286.6 g / 100.9 N
|
OK |
| 80 °C | -6.6% |
10.05 kg / 22.16 LBS
10049.8 g / 98.6 N
|
|
| 100 °C | -28.8% |
7.66 kg / 16.89 LBS
7661.1 g / 75.2 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 18x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
33.25 kg / 73.30 LBS
5 648 Gs
|
4.99 kg / 10.99 LBS
4987 g / 48.9 N
|
N/A |
| 1 mm |
29.87 kg / 65.85 LBS
8 727 Gs
|
4.48 kg / 9.88 LBS
4480 g / 44.0 N
|
26.88 kg / 59.27 LBS
~0 Gs
|
| 2 mm |
26.55 kg / 58.53 LBS
8 228 Gs
|
3.98 kg / 8.78 LBS
3983 g / 39.1 N
|
23.90 kg / 52.68 LBS
~0 Gs
|
| 3 mm |
23.41 kg / 51.62 LBS
7 727 Gs
|
3.51 kg / 7.74 LBS
3512 g / 34.5 N
|
21.07 kg / 46.46 LBS
~0 Gs
|
| 5 mm |
17.84 kg / 39.33 LBS
6 744 Gs
|
2.68 kg / 5.90 LBS
2676 g / 26.3 N
|
16.06 kg / 35.40 LBS
~0 Gs
|
| 10 mm |
8.34 kg / 18.38 LBS
4 611 Gs
|
1.25 kg / 2.76 LBS
1251 g / 12.3 N
|
7.50 kg / 16.54 LBS
~0 Gs
|
| 20 mm |
1.71 kg / 3.78 LBS
2 091 Gs
|
0.26 kg / 0.57 LBS
257 g / 2.5 N
|
1.54 kg / 3.40 LBS
~0 Gs
|
| 50 mm |
0.05 kg / 0.10 LBS
342 Gs
|
0.01 kg / 0.02 LBS
7 g / 0.1 N
|
0.04 kg / 0.09 LBS
~0 Gs
|
| 60 mm |
0.02 kg / 0.04 LBS
221 Gs
|
0.00 kg / 0.01 LBS
3 g / 0.0 N
|
0.02 kg / 0.04 LBS
~0 Gs
|
| 70 mm |
0.01 kg / 0.02 LBS
150 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 80 mm |
0.00 kg / 0.01 LBS
106 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 90 mm |
0.00 kg / 0.01 LBS
78 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 LBS
59 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MW 18x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 9.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 7.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 6.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 4.5 cm |
| Car key | 50 Gs (5.0 mT) | 4.5 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MW 18x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
24.70 km/h
(6.86 m/s)
|
0.45 J | |
| 30 mm |
41.49 km/h
(11.52 m/s)
|
1.27 J | |
| 50 mm |
53.54 km/h
(14.87 m/s)
|
2.11 J | |
| 100 mm |
75.72 km/h
(21.03 m/s)
|
4.22 J |
Table 9: Anti-corrosion coating durability
MW 18x10 / 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 18x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 11 828 Mx | 118.3 µWb |
| Pc Coefficient | 0.63 | High (Stable) |
Table 11: Submerged application
MW 18x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 10.76 kg | Standard |
| Water (riverbed) |
12.32 kg
(+1.56 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical surface, the magnet holds merely a fraction of its max power.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Heat tolerance
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.63
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Strengths as well as weaknesses of neodymium magnets.
Pros
- They have stable power, and over nearly ten years their attraction force decreases symbolically – ~1% (according to theory),
- They are noted for resistance to demagnetization induced by presence of other magnetic fields,
- Thanks to the shiny finish, the layer of nickel, gold, or silver gives an visually attractive appearance,
- Magnetic induction on the top side of the magnet turns out to be maximum,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Possibility of detailed machining and adapting to atypical requirements,
- Significant place in advanced technology sectors – they serve a role in computer drives, brushless drives, medical devices, and other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in small systems
Disadvantages
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
- When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength 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
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We suggest casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated shapes.
- Possible danger related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these products are able to complicate diagnosis medical after entering the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Best holding force of the magnet in ideal parameters – what contributes to it?
- with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
- with a thickness minimum 10 mm
- characterized by even structure
- under conditions of ideal adhesion (metal-to-metal)
- under vertical force vector (90-degree angle)
- in stable room temperature
Magnet lifting force in use – key factors
- Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Plate thickness – too thin steel does not close the flux, causing part of the power to be escaped into the air.
- Metal type – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
- Surface structure – the more even the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
- Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.
Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate reduces the load capacity.
Precautions when working with neodymium magnets
Threat to navigation
Remember: rare earth magnets generate a field that interferes with precision electronics. Maintain a separation from your phone, device, and navigation systems.
Danger to the youngest
These products are not suitable for play. Eating a few magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and necessitates immediate surgery.
Health Danger
Warning for patients: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or request help to work with the magnets.
Fire warning
Machining of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Immense force
Handle with care. Neodymium magnets attract from a distance and connect with huge force, often quicker than you can react.
Operating temperature
Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. This process is irreversible.
Keep away from computers
Powerful magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.
Finger safety
Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!
Beware of splinters
Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.
Allergy Warning
Certain individuals suffer from a sensitization to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact may cause skin redness. It is best to use safety gloves.
