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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Technical parameters - 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 simulation of the product - data
Presented values constitute the result of a engineering calculation. Results rely on algorithms for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Use these data as a preliminary roadmap during assembly planning.
Table 1: Static force (pull vs distance) - power drop
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
|
strong |
| 1 mm |
4162 Gs
416.2 mT
|
1.15 kg / 1149.3 g
11.3 N
|
safe |
| 2 mm |
2984 Gs
298.4 mT
|
0.59 kg / 590.7 g
5.8 N
|
safe |
| 3 mm |
2107 Gs
210.7 mT
|
0.29 kg / 294.5 g
2.9 N
|
safe |
| 5 mm |
1084 Gs
108.4 mT
|
0.08 kg / 78.0 g
0.8 N
|
safe |
| 10 mm |
296 Gs
29.6 mT
|
0.01 kg / 5.8 g
0.1 N
|
safe |
| 15 mm |
118 Gs
11.8 mT
|
0.00 kg / 0.9 g
0.0 N
|
safe |
| 20 mm |
58 Gs
5.8 mT
|
0.00 kg / 0.2 g
0.0 N
|
safe |
| 30 mm |
20 Gs
2.0 mT
|
0.00 kg / 0.0 g
0.0 N
|
safe |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.0 g
0.0 N
|
safe |
Table 2: Shear force (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: Vertical assembly (shearing) - behavior on slippery surfaces
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) - power losses
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 (material behavior) - 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) - forces in the system
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: Hazards (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: Impact energy (cracking risk) - collision effects
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: Anti-corrosion coating durability
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: Electrical 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 wall, the magnet holds merely approx. 20-30% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.
3. Temperature resistance
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.89
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 offers
Pros and cons of rare earth magnets.
Advantages
- Their power is durable, and after around 10 years it decreases only by ~1% (according to research),
- They are noted for resistance to demagnetization induced by external disturbances,
- In other words, due to the aesthetic layer of gold, the element looks attractive,
- Magnets are distinguished by huge magnetic induction on the outer side,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Due to the possibility of precise forming and adaptation to unique needs, NdFeB magnets can be manufactured in a variety of geometric configurations, which makes them more universal,
- Universal use in innovative solutions – they serve a role in data components, electromotive mechanisms, diagnostic systems, as well as other advanced devices.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Weaknesses
- At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing threads and complicated forms in magnets, we propose using casing - magnetic holder.
- Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these devices can complicate diagnosis medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Lifting parameters
Maximum magnetic pulling force – what it depends on?
- using a base made of low-carbon steel, acting as a circuit closing element
- possessing a thickness of minimum 10 mm to avoid saturation
- with an ideally smooth contact surface
- with direct contact (no paint)
- for force acting at a right angle (pull-off, not shear)
- at conditions approx. 20°C
Practical aspects of lifting capacity – factors
- Air gap (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, rust or dirt).
- Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
- Base massiveness – insufficiently thick steel does not close the flux, causing part of the power to be wasted to the other side.
- Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
- Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet and the plate reduces the holding force.
Precautions when working with neodymium magnets
Warning for allergy sufferers
It is widely known that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, avoid direct skin contact or choose coated magnets.
Dust is flammable
Powder generated during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Do not overheat magnets
Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.
Magnetic media
Device Safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, medical aids, mechanical watches).
GPS and phone interference
An intense magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Maintain magnets near a device to avoid damaging the sensors.
Warning for heart patients
Warning for patients: Powerful magnets affect electronics. Keep at least 30 cm distance or request help to handle the magnets.
Protective goggles
Protect your eyes. Magnets can fracture upon uncontrolled impact, launching shards into the air. Wear goggles.
Bodily injuries
Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!
Swallowing risk
Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Store out of reach of children and animals.
Do not underestimate power
Use magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and respect their force.
