MW 8x8 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010106
GTIN/EAN: 5906301811053
Diameter Ø
8 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
3.02 g
Magnetization Direction
↑ axial
Load capacity
2.03 kg / 19.92 N
Magnetic Induction
553.67 mT / 5537 Gs
Coating
[NiCuNi] Nickel
1.341 ZŁ with VAT / pcs + price for transport
1.090 ZŁ net + 23% VAT / pcs
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Detailed specifications MW 8x8 / N38 - cylindrical magnet
Specification / characteristics - MW 8x8 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010106 |
| GTIN/EAN | 5906301811053 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 8 mm [±0,1 mm] |
| Weight | 3.02 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.03 kg / 19.92 N |
| Magnetic Induction ~ ? | 553.67 mT / 5537 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 product - technical parameters
These information represent the direct effect of a mathematical simulation. Values rely on models for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Use these calculations as a supplementary guide for designers.
Table 1: Static pull force (pull vs gap) - characteristics
MW 8x8 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
5531 Gs
553.1 mT
|
2.03 kg / 2030.0 g
19.9 N
|
warning |
| 1 mm |
4162 Gs
416.2 mT
|
1.15 kg / 1149.3 g
11.3 N
|
weak grip |
| 2 mm |
2984 Gs
298.4 mT
|
0.59 kg / 590.7 g
5.8 N
|
weak grip |
| 3 mm |
2107 Gs
210.7 mT
|
0.29 kg / 294.5 g
2.9 N
|
weak grip |
| 5 mm |
1084 Gs
108.4 mT
|
0.08 kg / 78.0 g
0.8 N
|
weak grip |
| 10 mm |
296 Gs
29.6 mT
|
0.01 kg / 5.8 g
0.1 N
|
weak grip |
| 15 mm |
118 Gs
11.8 mT
|
0.00 kg / 0.9 g
0.0 N
|
weak grip |
| 20 mm |
58 Gs
5.8 mT
|
0.00 kg / 0.2 g
0.0 N
|
weak grip |
| 30 mm |
20 Gs
2.0 mT
|
0.00 kg / 0.0 g
0.0 N
|
weak grip |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.0 g
0.0 N
|
weak grip |
Table 2: Shear hold (vertical surface)
MW 8x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.41 kg / 406.0 g
4.0 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 230.0 g
2.3 N
|
| 2 mm | Stal (~0.2) |
0.12 kg / 118.0 g
1.2 N
|
| 3 mm | Stal (~0.2) |
0.06 kg / 58.0 g
0.6 N
|
| 5 mm | Stal (~0.2) |
0.02 kg / 16.0 g
0.2 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
Table 3: Wall mounting (shearing) - vertical pull
MW 8x8 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.61 kg / 609.0 g
6.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.41 kg / 406.0 g
4.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.20 kg / 203.0 g
2.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.02 kg / 1015.0 g
10.0 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 8x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.20 kg / 203.0 g
2.0 N
|
| 1 mm |
|
0.51 kg / 507.5 g
5.0 N
|
| 2 mm |
|
1.02 kg / 1015.0 g
10.0 N
|
| 5 mm |
|
2.03 kg / 2030.0 g
19.9 N
|
| 10 mm |
|
2.03 kg / 2030.0 g
19.9 N
|
Table 5: Thermal stability (stability) - resistance threshold
MW 8x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.03 kg / 2030.0 g
19.9 N
|
OK |
| 40 °C | -2.2% |
1.99 kg / 1985.3 g
19.5 N
|
OK |
| 60 °C | -4.4% |
1.94 kg / 1940.7 g
19.0 N
|
OK |
| 80 °C | -6.6% |
1.90 kg / 1896.0 g
18.6 N
|
|
| 100 °C | -28.8% |
1.45 kg / 1445.4 g
14.2 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 8x8 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
9.48 kg / 9481 g
93.0 N
6 000 Gs
|
N/A |
| 1 mm |
7.26 kg / 7262 g
71.2 N
9 682 Gs
|
6.54 kg / 6536 g
64.1 N
~0 Gs
|
| 2 mm |
5.37 kg / 5368 g
52.7 N
8 324 Gs
|
4.83 kg / 4831 g
47.4 N
~0 Gs
|
| 3 mm |
3.88 kg / 3877 g
38.0 N
7 074 Gs
|
3.49 kg / 3489 g
34.2 N
~0 Gs
|
| 5 mm |
1.95 kg / 1949 g
19.1 N
5 016 Gs
|
1.75 kg / 1754 g
17.2 N
~0 Gs
|
| 10 mm |
0.36 kg / 364 g
3.6 N
2 169 Gs
|
0.33 kg / 328 g
3.2 N
~0 Gs
|
| 20 mm |
0.03 kg / 27 g
0.3 N
592 Gs
|
0.02 kg / 24 g
0.2 N
~0 Gs
|
| 50 mm |
0.00 kg / 0 g
0.0 N
66 Gs
|
0.00 kg / 0 g
0.0 N
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
MW 8x8 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.5 cm |
| Remote | 50 Gs (5.0 mT) | 2.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Collisions (cracking risk) - warning
MW 8x8 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
26.19 km/h
(7.28 m/s)
|
0.08 J | |
| 30 mm |
45.29 km/h
(12.58 m/s)
|
0.24 J | |
| 50 mm |
58.47 km/h
(16.24 m/s)
|
0.40 J | |
| 100 mm |
82.68 km/h
(22.97 m/s)
|
0.80 J |
Table 9: Corrosion resistance
MW 8x8 / 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 8x8 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 868 Mx | 28.7 µWb |
| Pc Coefficient | 0.89 | High (Stable) |
Table 11: Physics of underwater searching
MW 8x8 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.03 kg | Standard |
| Water (riverbed) |
2.32 kg
(+0.29 kg Buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical surface, the magnet retains just a fraction of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Temperature resistance
*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) = 0.89
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Pros and cons of neodymium magnets.
Strengths
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
- They have excellent resistance to magnetism drop as a result of external magnetic sources,
- Thanks to the shimmering finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an visually attractive appearance,
- Magnetic induction on the working layer of the magnet turns out to be exceptional,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Thanks to the possibility of accurate forming and adaptation to unique solutions, magnetic components can be produced in a wide range of shapes and sizes, which increases their versatility,
- Key role in modern industrial fields – they are utilized in HDD drives, motor assemblies, medical equipment, also other advanced devices.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Cons
- To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- Due to limitations in creating nuts and complex shapes in magnets, we recommend using a housing - magnetic holder.
- Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these magnets are able to be problematic in diagnostics medical after entering the body.
- Due to expensive raw materials, their price is relatively high,
Lifting parameters
Maximum lifting capacity of the magnet – what affects it?
- using a base made of high-permeability steel, acting as a magnetic yoke
- with a thickness no less than 10 mm
- characterized by smoothness
- under conditions of ideal adhesion (metal-to-metal)
- under vertical application of breakaway force (90-degree angle)
- at conditions approx. 20°C
Magnet lifting force in use – key factors
- Gap (between the magnet and the metal), as even a tiny clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
- Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
- Metal type – different alloys reacts the same. Alloy additives weaken the attraction effect.
- Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate lowers the lifting capacity.
Safe handling of neodymium magnets
Medical implants
For implant holders: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.
Product not for children
Strictly store magnets out of reach of children. Choking hazard is high, and the consequences of magnets clamping inside the body are tragic.
Allergy Warning
It is widely known that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, avoid touching magnets with bare hands and choose versions in plastic housing.
Combustion hazard
Dust created during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.
Do not overheat magnets
Keep cool. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).
Electronic hazard
Data protection: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).
Crushing force
Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!
Impact on smartphones
A powerful magnetic field negatively affects the operation of magnetometers in phones and navigation systems. Maintain magnets close to a smartphone to prevent breaking the sensors.
Risk of cracking
Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Immense force
Exercise caution. Rare earth magnets act from a long distance and snap with massive power, often quicker than you can react.
