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
bulk discounts:
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Technical data of the product - 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 |
Technical simulation of the product - data
Presented information represent the outcome of a engineering calculation. Values were calculated on algorithms for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Use these calculations as a reference point when designing systems.
Table 1: Static force (force vs gap) - characteristics
MW 8x8 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5531 Gs
553.1 mT
|
2.03 kg / 4.48 LBS
2030.0 g / 19.9 N
|
strong |
| 1 mm |
4162 Gs
416.2 mT
|
1.15 kg / 2.53 LBS
1149.3 g / 11.3 N
|
weak grip |
| 2 mm |
2984 Gs
298.4 mT
|
0.59 kg / 1.30 LBS
590.7 g / 5.8 N
|
weak grip |
| 3 mm |
2107 Gs
210.7 mT
|
0.29 kg / 0.65 LBS
294.5 g / 2.9 N
|
weak grip |
| 5 mm |
1084 Gs
108.4 mT
|
0.08 kg / 0.17 LBS
78.0 g / 0.8 N
|
weak grip |
| 10 mm |
296 Gs
29.6 mT
|
0.01 kg / 0.01 LBS
5.8 g / 0.1 N
|
weak grip |
| 15 mm |
118 Gs
11.8 mT
|
0.00 kg / 0.00 LBS
0.9 g / 0.0 N
|
weak grip |
| 20 mm |
58 Gs
5.8 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
weak grip |
| 30 mm |
20 Gs
2.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Shear capacity (wall)
MW 8x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.41 kg / 0.90 LBS
406.0 g / 4.0 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 0.51 LBS
230.0 g / 2.3 N
|
| 2 mm | Stal (~0.2) |
0.12 kg / 0.26 LBS
118.0 g / 1.2 N
|
| 3 mm | Stal (~0.2) |
0.06 kg / 0.13 LBS
58.0 g / 0.6 N
|
| 5 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
16.0 g / 0.2 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 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 (shearing) - vertical pull
MW 8x8 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.61 kg / 1.34 LBS
609.0 g / 6.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.41 kg / 0.90 LBS
406.0 g / 4.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.20 kg / 0.45 LBS
203.0 g / 2.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.02 kg / 2.24 LBS
1015.0 g / 10.0 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 8x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.20 kg / 0.45 LBS
203.0 g / 2.0 N
|
| 1 mm |
|
0.51 kg / 1.12 LBS
507.5 g / 5.0 N
|
| 2 mm |
|
1.02 kg / 2.24 LBS
1015.0 g / 10.0 N
|
| 3 mm |
|
1.52 kg / 3.36 LBS
1522.5 g / 14.9 N
|
| 5 mm |
|
2.03 kg / 4.48 LBS
2030.0 g / 19.9 N
|
| 10 mm |
|
2.03 kg / 4.48 LBS
2030.0 g / 19.9 N
|
| 11 mm |
|
2.03 kg / 4.48 LBS
2030.0 g / 19.9 N
|
| 12 mm |
|
2.03 kg / 4.48 LBS
2030.0 g / 19.9 N
|
Table 5: Thermal resistance (stability) - thermal limit
MW 8x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.03 kg / 4.48 LBS
2030.0 g / 19.9 N
|
OK |
| 40 °C | -2.2% |
1.99 kg / 4.38 LBS
1985.3 g / 19.5 N
|
OK |
| 60 °C | -4.4% |
1.94 kg / 4.28 LBS
1940.7 g / 19.0 N
|
OK |
| 80 °C | -6.6% |
1.90 kg / 4.18 LBS
1896.0 g / 18.6 N
|
|
| 100 °C | -28.8% |
1.45 kg / 3.19 LBS
1445.4 g / 14.2 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MW 8x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
9.48 kg / 20.90 LBS
6 000 Gs
|
1.42 kg / 3.14 LBS
1422 g / 14.0 N
|
N/A |
| 1 mm |
7.26 kg / 16.01 LBS
9 682 Gs
|
1.09 kg / 2.40 LBS
1089 g / 10.7 N
|
6.54 kg / 14.41 LBS
~0 Gs
|
| 2 mm |
5.37 kg / 11.83 LBS
8 324 Gs
|
0.81 kg / 1.78 LBS
805 g / 7.9 N
|
4.83 kg / 10.65 LBS
~0 Gs
|
| 3 mm |
3.88 kg / 8.55 LBS
7 074 Gs
|
0.58 kg / 1.28 LBS
582 g / 5.7 N
|
3.49 kg / 7.69 LBS
~0 Gs
|
| 5 mm |
1.95 kg / 4.30 LBS
5 016 Gs
|
0.29 kg / 0.64 LBS
292 g / 2.9 N
|
1.75 kg / 3.87 LBS
~0 Gs
|
| 10 mm |
0.36 kg / 0.80 LBS
2 169 Gs
|
0.05 kg / 0.12 LBS
55 g / 0.5 N
|
0.33 kg / 0.72 LBS
~0 Gs
|
| 20 mm |
0.03 kg / 0.06 LBS
592 Gs
|
0.00 kg / 0.01 LBS
4 g / 0.0 N
|
0.02 kg / 0.05 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
66 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 LBS
41 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 LBS
27 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 LBS
19 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 LBS
14 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
10 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Safety (HSE) (electronics) - 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 |
| Car key | 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 (kinetic energy) - 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: Coating parameters (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: 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. Wall mount (shear)
*Caution: On a vertical wall, the magnet holds only approx. 20-30% of its max power.
2. Efficiency vs thickness
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces 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) = 0.89
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.
Elemental analysis
| 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 |
See also offers
Pros as well as cons of Nd2Fe14B magnets.
Strengths
- They do not lose magnetism, even over nearly ten years – the reduction in power is only ~1% (based on measurements),
- They show high resistance to demagnetization induced by presence of other magnetic fields,
- In other words, due to the aesthetic surface of silver, the element gains visual value,
- Magnetic induction on the top side of the magnet remains strong,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Thanks to versatility in shaping and the ability to adapt to complex applications,
- Wide application in advanced technology sectors – they are utilized in magnetic memories, motor assemblies, advanced medical instruments, as well as multitasking production systems.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Cons
- At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- Due to limitations in creating threads and complicated forms in magnets, we propose using cover - magnetic mount.
- Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small elements of these devices are able to be problematic in diagnostics medical after entering the body.
- Due to complex production process, their price is higher than average,
Holding force characteristics
Highest magnetic holding force – what contributes to it?
- on a plate made of structural steel, perfectly concentrating the magnetic field
- with a thickness minimum 10 mm
- with a plane perfectly flat
- without any insulating layer between the magnet and steel
- during pulling in a direction perpendicular to the mounting surface
- at room temperature
What influences lifting capacity in practice
- Distance – existence of any layer (paint, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
- Direction of force – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
- Base massiveness – insufficiently thick plate does not accept the full field, causing part of the power to be escaped into the air.
- Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
- Surface finish – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
- Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet’s surface and the plate lowers the holding force.
Warnings
Maximum temperature
Do not overheat. NdFeB magnets are susceptible to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).
Nickel coating and allergies
Some people suffer from a sensitization to nickel, which is the standard coating for NdFeB magnets. Frequent touching can result in a rash. It is best to wear protective gloves.
Magnetic media
Do not bring magnets close to a purse, laptop, or screen. The magnetic field can permanently damage these devices and erase data from cards.
Crushing force
Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!
Eye protection
Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.
Pacemakers
For implant holders: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.
GPS and phone interference
Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.
Dust is flammable
Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
Immense force
Exercise caution. Rare earth magnets act from a distance and connect with massive power, often quicker than you can react.
Product not for children
Adult use only. Small elements can be swallowed, causing severe trauma. Store out of reach of children and animals.
