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
6.36 ZŁ net + 23% VAT / pcs
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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 |
Technical simulation of the product - report
The following values are the direct effect of a physical simulation. Results rely on models for the material Nd2Fe14B. Actual performance might slightly differ. Use these calculations as a supplementary guide when designing systems.
Table 1: Static force (force vs distance) - interaction chart
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 pounds
10760.0 g / 105.6 N
|
critical level |
| 1 mm |
4114 Gs
411.4 mT
|
8.59 kg / 18.94 pounds
8592.4 g / 84.3 N
|
medium risk |
| 2 mm |
3615 Gs
361.5 mT
|
6.64 kg / 14.63 pounds
6635.0 g / 65.1 N
|
medium risk |
| 3 mm |
3137 Gs
313.7 mT
|
5.00 kg / 11.01 pounds
4996.2 g / 49.0 N
|
medium risk |
| 5 mm |
2305 Gs
230.5 mT
|
2.70 kg / 5.95 pounds
2698.6 g / 26.5 N
|
medium risk |
| 10 mm |
1045 Gs
104.5 mT
|
0.55 kg / 1.22 pounds
555.0 g / 5.4 N
|
low risk |
| 15 mm |
517 Gs
51.7 mT
|
0.14 kg / 0.30 pounds
135.7 g / 1.3 N
|
low risk |
| 20 mm |
285 Gs
28.5 mT
|
0.04 kg / 0.09 pounds
41.1 g / 0.4 N
|
low risk |
| 30 mm |
110 Gs
11.0 mT
|
0.01 kg / 0.01 pounds
6.2 g / 0.1 N
|
low risk |
| 50 mm |
29 Gs
2.9 mT
|
0.00 kg / 0.00 pounds
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 pounds
2152.0 g / 21.1 N
|
| 1 mm | Stal (~0.2) |
1.72 kg / 3.79 pounds
1718.0 g / 16.9 N
|
| 2 mm | Stal (~0.2) |
1.33 kg / 2.93 pounds
1328.0 g / 13.0 N
|
| 3 mm | Stal (~0.2) |
1.00 kg / 2.20 pounds
1000.0 g / 9.8 N
|
| 5 mm | Stal (~0.2) |
0.54 kg / 1.19 pounds
540.0 g / 5.3 N
|
| 10 mm | Stal (~0.2) |
0.11 kg / 0.24 pounds
110.0 g / 1.1 N
|
| 15 mm | Stal (~0.2) |
0.03 kg / 0.06 pounds
28.0 g / 0.3 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
8.0 g / 0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - 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 pounds
3228.0 g / 31.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.15 kg / 4.74 pounds
2152.0 g / 21.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.08 kg / 2.37 pounds
1076.0 g / 10.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
5.38 kg / 11.86 pounds
5380.0 g / 52.8 N
|
Table 4: Material efficiency (saturation) - 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 pounds
538.0 g / 5.3 N
|
| 1 mm |
|
1.35 kg / 2.97 pounds
1345.0 g / 13.2 N
|
| 2 mm |
|
2.69 kg / 5.93 pounds
2690.0 g / 26.4 N
|
| 3 mm |
|
4.04 kg / 8.90 pounds
4035.0 g / 39.6 N
|
| 5 mm |
|
6.73 kg / 14.83 pounds
6725.0 g / 66.0 N
|
| 10 mm |
|
10.76 kg / 23.72 pounds
10760.0 g / 105.6 N
|
| 11 mm |
|
10.76 kg / 23.72 pounds
10760.0 g / 105.6 N
|
| 12 mm |
|
10.76 kg / 23.72 pounds
10760.0 g / 105.6 N
|
Table 5: Thermal stability (material behavior) - 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 pounds
10760.0 g / 105.6 N
|
OK |
| 40 °C | -2.2% |
10.52 kg / 23.20 pounds
10523.3 g / 103.2 N
|
OK |
| 60 °C | -4.4% |
10.29 kg / 22.68 pounds
10286.6 g / 100.9 N
|
OK |
| 80 °C | -6.6% |
10.05 kg / 22.16 pounds
10049.8 g / 98.6 N
|
|
| 100 °C | -28.8% |
7.66 kg / 16.89 pounds
7661.1 g / 75.2 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 18x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
33.25 kg / 73.30 pounds
5 648 Gs
|
4.99 kg / 10.99 pounds
4987 g / 48.9 N
|
N/A |
| 1 mm |
29.87 kg / 65.85 pounds
8 727 Gs
|
4.48 kg / 9.88 pounds
4480 g / 44.0 N
|
26.88 kg / 59.27 pounds
~0 Gs
|
| 2 mm |
26.55 kg / 58.53 pounds
8 228 Gs
|
3.98 kg / 8.78 pounds
3983 g / 39.1 N
|
23.90 kg / 52.68 pounds
~0 Gs
|
| 3 mm |
23.41 kg / 51.62 pounds
7 727 Gs
|
3.51 kg / 7.74 pounds
3512 g / 34.5 N
|
21.07 kg / 46.46 pounds
~0 Gs
|
| 5 mm |
17.84 kg / 39.33 pounds
6 744 Gs
|
2.68 kg / 5.90 pounds
2676 g / 26.3 N
|
16.06 kg / 35.40 pounds
~0 Gs
|
| 10 mm |
8.34 kg / 18.38 pounds
4 611 Gs
|
1.25 kg / 2.76 pounds
1251 g / 12.3 N
|
7.50 kg / 16.54 pounds
~0 Gs
|
| 20 mm |
1.71 kg / 3.78 pounds
2 091 Gs
|
0.26 kg / 0.57 pounds
257 g / 2.5 N
|
1.54 kg / 3.40 pounds
~0 Gs
|
| 50 mm |
0.05 kg / 0.10 pounds
342 Gs
|
0.01 kg / 0.02 pounds
7 g / 0.1 N
|
0.04 kg / 0.09 pounds
~0 Gs
|
| 60 mm |
0.02 kg / 0.04 pounds
221 Gs
|
0.00 kg / 0.01 pounds
3 g / 0.0 N
|
0.02 kg / 0.04 pounds
~0 Gs
|
| 70 mm |
0.01 kg / 0.02 pounds
150 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.01 pounds
106 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.01 pounds
78 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
59 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Hazards (electronics) - warnings
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 |
| Remote | 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: Collisions (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: Surface protection spec
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 (Flux)
MW 18x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 11 828 Mx | 118.3 µWb |
| Pc Coefficient | 0.63 | High (Stable) |
Table 11: Underwater work (magnet fishing)
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 wall, the magnet holds just a fraction of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) significantly reduces the holding force.
3. Power loss vs temp
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.63
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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Pros as well as cons of rare earth magnets.
Strengths
- They have unchanged lifting capacity, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
- Neodymium magnets prove to be extremely resistant to loss of magnetic properties caused by external interference,
- By covering with a decorative layer of nickel, the element has an professional look,
- Magnetic induction on the working layer of the magnet turns out to be strong,
- 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...
- Due to the possibility of free molding and adaptation to individualized requirements, NdFeB magnets can be modeled in a wide range of geometric configurations, which makes them more universal,
- Huge importance in modern industrial fields – they are used in HDD drives, motor assemblies, medical equipment, as well as other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in small systems
Cons
- To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
- Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures 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 holder, due to difficulties in creating threads inside the magnet and complicated forms.
- Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
- With large orders the cost of neodymium magnets can be a barrier,
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what it depends on?
- on a block made of mild steel, effectively closing the magnetic flux
- whose thickness equals approx. 10 mm
- characterized by even structure
- under conditions of gap-free contact (surface-to-surface)
- during detachment in a direction vertical to the mounting surface
- at temperature approx. 20 degrees Celsius
Determinants of practical lifting force of a magnet
- Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Plate thickness – too thin plate does not close the flux, causing part of the flux to be escaped to the other side.
- Metal type – different alloys reacts the same. Alloy additives weaken the attraction effect.
- Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
- Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity was determined with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.
Safe handling of NdFeB magnets
Conscious usage
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.
Metal Allergy
Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease handling magnets and use protective gear.
Implant safety
People with a ICD must keep an large gap from magnets. The magnetism can disrupt the functioning of the life-saving device.
Electronic hazard
Avoid bringing magnets close to a wallet, laptop, or TV. The magnetic field can permanently damage these devices and erase data from cards.
Fragile material
Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.
Do not overheat magnets
Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.
Pinching danger
Large magnets can break fingers in a fraction of a second. Do not put your hand betwixt two strong magnets.
Dust explosion hazard
Fire warning: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.
Choking Hazard
Always store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are tragic.
GPS Danger
A strong magnetic field disrupts the operation of magnetometers in phones and navigation systems. Do not bring magnets close to a device to prevent breaking the sensors.
