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:
Need more?
Call us now
+48 888 99 98 98
otherwise get in touch by means of
form
our website.
Parameters as well as structure of a neodymium magnet can be checked on our
force calculator.
Orders submitted before 14:00 will be dispatched today!
Technical 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 |
Engineering modeling of the assembly - technical parameters
The following data are the result of a mathematical analysis. Values are based on models for the material Nd2Fe14B. Actual conditions may differ. Please consider these data as a reference point for designers.
Table 1: Static force (force vs distance) - interaction chart
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 pounds
2030.0 g / 19.9 N
|
medium risk |
| 1 mm |
4162 Gs
416.2 mT
|
1.15 kg / 2.53 pounds
1149.3 g / 11.3 N
|
low risk |
| 2 mm |
2984 Gs
298.4 mT
|
0.59 kg / 1.30 pounds
590.7 g / 5.8 N
|
low risk |
| 3 mm |
2107 Gs
210.7 mT
|
0.29 kg / 0.65 pounds
294.5 g / 2.9 N
|
low risk |
| 5 mm |
1084 Gs
108.4 mT
|
0.08 kg / 0.17 pounds
78.0 g / 0.8 N
|
low risk |
| 10 mm |
296 Gs
29.6 mT
|
0.01 kg / 0.01 pounds
5.8 g / 0.1 N
|
low risk |
| 15 mm |
118 Gs
11.8 mT
|
0.00 kg / 0.00 pounds
0.9 g / 0.0 N
|
low risk |
| 20 mm |
58 Gs
5.8 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
low risk |
| 30 mm |
20 Gs
2.0 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Slippage force (vertical surface)
MW 8x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.41 kg / 0.90 pounds
406.0 g / 4.0 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 0.51 pounds
230.0 g / 2.3 N
|
| 2 mm | Stal (~0.2) |
0.12 kg / 0.26 pounds
118.0 g / 1.2 N
|
| 3 mm | Stal (~0.2) |
0.06 kg / 0.13 pounds
58.0 g / 0.6 N
|
| 5 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
16.0 g / 0.2 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 pounds
609.0 g / 6.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.41 kg / 0.90 pounds
406.0 g / 4.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.20 kg / 0.45 pounds
203.0 g / 2.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.02 kg / 2.24 pounds
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/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.20 kg / 0.45 pounds
203.0 g / 2.0 N
|
| 1 mm |
|
0.51 kg / 1.12 pounds
507.5 g / 5.0 N
|
| 2 mm |
|
1.02 kg / 2.24 pounds
1015.0 g / 10.0 N
|
| 3 mm |
|
1.52 kg / 3.36 pounds
1522.5 g / 14.9 N
|
| 5 mm |
|
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
|
| 10 mm |
|
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
|
| 11 mm |
|
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
|
| 12 mm |
|
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
|
Table 5: Working in heat (material behavior) - power drop
MW 8x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
|
OK |
| 40 °C | -2.2% |
1.99 kg / 4.38 pounds
1985.3 g / 19.5 N
|
OK |
| 60 °C | -4.4% |
1.94 kg / 4.28 pounds
1940.7 g / 19.0 N
|
OK |
| 80 °C | -6.6% |
1.90 kg / 4.18 pounds
1896.0 g / 18.6 N
|
|
| 100 °C | -28.8% |
1.45 kg / 3.19 pounds
1445.4 g / 14.2 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 8x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
9.48 kg / 20.90 pounds
6 000 Gs
|
1.42 kg / 3.14 pounds
1422 g / 14.0 N
|
N/A |
| 1 mm |
7.26 kg / 16.01 pounds
9 682 Gs
|
1.09 kg / 2.40 pounds
1089 g / 10.7 N
|
6.54 kg / 14.41 pounds
~0 Gs
|
| 2 mm |
5.37 kg / 11.83 pounds
8 324 Gs
|
0.81 kg / 1.78 pounds
805 g / 7.9 N
|
4.83 kg / 10.65 pounds
~0 Gs
|
| 3 mm |
3.88 kg / 8.55 pounds
7 074 Gs
|
0.58 kg / 1.28 pounds
582 g / 5.7 N
|
3.49 kg / 7.69 pounds
~0 Gs
|
| 5 mm |
1.95 kg / 4.30 pounds
5 016 Gs
|
0.29 kg / 0.64 pounds
292 g / 2.9 N
|
1.75 kg / 3.87 pounds
~0 Gs
|
| 10 mm |
0.36 kg / 0.80 pounds
2 169 Gs
|
0.05 kg / 0.12 pounds
55 g / 0.5 N
|
0.33 kg / 0.72 pounds
~0 Gs
|
| 20 mm |
0.03 kg / 0.06 pounds
592 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
66 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
41 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
27 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
19 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
14 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
10 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
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 |
| Timepiece | 20 Gs (2.0 mT) | 3.5 cm |
| Phone / Smartphone | 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: Dynamics (kinetic energy) - 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: 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: 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: Submerged application
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)
*Note: On a vertical surface, the magnet holds just approx. 20-30% of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Temperature resistance
*For N38 grade, 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.
Chemical composition
| 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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Advantages and disadvantages of Nd2Fe14B magnets.
Advantages
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
- They retain their magnetic properties even under strong external field,
- By covering with a reflective coating of gold, the element has an nice look,
- Magnets exhibit extremely high magnetic induction on the working surface,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
- Thanks to the option of flexible forming and customization to custom requirements, neodymium magnets can be produced in a variety of geometric configurations, which makes them more universal,
- Universal use in electronics industry – they find application in hard drives, electric drive systems, precision medical tools, and other advanced devices.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Disadvantages
- To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets suffer a drop in power. 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
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
- We suggest a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex forms.
- Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, small components of these products are able to be problematic in diagnostics medical in case of swallowing.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what it depends on?
- with the use of a sheet made of low-carbon steel, guaranteeing maximum field concentration
- possessing a massiveness of at least 10 mm to ensure full flux closure
- characterized by smoothness
- under conditions of ideal adhesion (surface-to-surface)
- for force applied at a right angle (pull-off, not shear)
- at temperature approx. 20 degrees Celsius
Impact of factors on magnetic holding capacity in practice
- Air gap (between the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
- Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Plate thickness – insufficiently thick plate does not accept the full field, causing part of the flux to be lost into the air.
- Steel type – low-carbon steel attracts best. Alloy admixtures decrease magnetic permeability and lifting capacity.
- Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.
Safety rules for work with neodymium magnets
Choking Hazard
Only for adults. Small elements pose a choking risk, causing serious injuries. Keep away from kids and pets.
Immense force
Exercise caution. Neodymium magnets attract from a long distance and snap with massive power, often quicker than you can move away.
Magnet fragility
Protect your eyes. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.
Metal Allergy
Medical facts indicate that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, avoid touching magnets with bare hands and select coated magnets.
Mechanical processing
Powder generated during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.
Maximum temperature
Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its properties and strength.
Medical implants
Warning for patients: Powerful magnets disrupt electronics. Keep at least 30 cm distance or request help to work with the magnets.
Protect data
Do not bring magnets near a wallet, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
GPS and phone interference
Remember: rare earth magnets generate a field that confuses sensitive sensors. Maintain a safe distance from your mobile, device, and GPS.
Serious injuries
Protect your hands. Two large magnets will join instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!
