MW 2x4 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010055
GTIN/EAN: 5906301810544
Diameter Ø
2 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
0.09 g
Magnetization Direction
↑ axial
Load capacity
0.09 kg / 0.86 N
Magnetic Induction
597.70 mT / 5977 Gs
Coating
[NiCuNi] Nickel
0.209 ZŁ with VAT / pcs + price for transport
0.1700 ZŁ net + 23% VAT / pcs
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Physical properties - MW 2x4 / N38 - cylindrical magnet
Specification / characteristics - MW 2x4 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010055 |
| GTIN/EAN | 5906301810544 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 2 mm [±0,1 mm] |
| Height | 4 mm [±0,1 mm] |
| Weight | 0.09 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.09 kg / 0.86 N |
| Magnetic Induction ~ ? | 597.70 mT / 5977 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 analysis of the product - data
The following values constitute the result of a engineering calculation. Results were calculated on models for the class Nd2Fe14B. Real-world conditions may differ. Use these data as a preliminary roadmap when designing systems.
Table 1: Static force (pull vs distance) - interaction chart
MW 2x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
5954 Gs
595.4 mT
|
0.09 kg / 90.0 g
0.9 N
|
weak grip |
| 1 mm |
1696 Gs
169.6 mT
|
0.01 kg / 7.3 g
0.1 N
|
weak grip |
| 2 mm |
570 Gs
57.0 mT
|
0.00 kg / 0.8 g
0.0 N
|
weak grip |
| 3 mm |
256 Gs
25.6 mT
|
0.00 kg / 0.2 g
0.0 N
|
weak grip |
| 5 mm |
82 Gs
8.2 mT
|
0.00 kg / 0.0 g
0.0 N
|
weak grip |
| 10 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.0 g
0.0 N
|
weak grip |
| 15 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.0 g
0.0 N
|
weak grip |
| 20 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.0 g
0.0 N
|
weak grip |
| 30 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.0 g
0.0 N
|
weak grip |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.0 g
0.0 N
|
weak grip |
Table 2: Sliding force (vertical surface)
MW 2x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.02 kg / 18.0 g
0.2 N
|
| 1 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
| 2 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.0 g
0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.0 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 2x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.03 kg / 27.0 g
0.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.02 kg / 18.0 g
0.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.01 kg / 9.0 g
0.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.05 kg / 45.0 g
0.4 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 2x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.01 kg / 9.0 g
0.1 N
|
| 1 mm |
|
0.02 kg / 22.5 g
0.2 N
|
| 2 mm |
|
0.05 kg / 45.0 g
0.4 N
|
| 5 mm |
|
0.09 kg / 90.0 g
0.9 N
|
| 10 mm |
|
0.09 kg / 90.0 g
0.9 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MW 2x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.09 kg / 90.0 g
0.9 N
|
OK |
| 40 °C | -2.2% |
0.09 kg / 88.0 g
0.9 N
|
OK |
| 60 °C | -4.4% |
0.09 kg / 86.0 g
0.8 N
|
OK |
| 80 °C | -6.6% |
0.08 kg / 84.1 g
0.8 N
|
|
| 100 °C | -28.8% |
0.06 kg / 64.1 g
0.6 N
|
Table 6: Two magnets (attraction) - field collision
MW 2x4 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
0.69 kg / 687 g
6.7 N
6 090 Gs
|
N/A |
| 1 mm |
0.21 kg / 208 g
2.0 N
6 559 Gs
|
0.19 kg / 187 g
1.8 N
~0 Gs
|
| 2 mm |
0.06 kg / 56 g
0.5 N
3 391 Gs
|
0.05 kg / 50 g
0.5 N
~0 Gs
|
| 3 mm |
0.02 kg / 17 g
0.2 N
1 883 Gs
|
0.02 kg / 15 g
0.2 N
~0 Gs
|
| 5 mm |
0.00 kg / 3 g
0.0 N
743 Gs
|
0.00 kg / 0 g
0.0 N
~0 Gs
|
| 10 mm |
0.00 kg / 0 g
0.0 N
165 Gs
|
0.00 kg / 0 g
0.0 N
~0 Gs
|
| 20 mm |
0.00 kg / 0 g
0.0 N
30 Gs
|
0.00 kg / 0 g
0.0 N
~0 Gs
|
| 50 mm |
0.00 kg / 0 g
0.0 N
3 Gs
|
0.00 kg / 0 g
0.0 N
~0 Gs
|
Table 7: Hazards (implants) - warnings
MW 2x4 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 2.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 1.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 1.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 1.0 cm |
| Remote | 50 Gs (5.0 mT) | 1.0 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Dynamics (cracking risk) - warning
MW 2x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
31.89 km/h
(8.86 m/s)
|
0.00 J | |
| 30 mm |
55.24 km/h
(15.34 m/s)
|
0.01 J | |
| 50 mm |
71.31 km/h
(19.81 m/s)
|
0.02 J | |
| 100 mm |
100.85 km/h
(28.01 m/s)
|
0.04 J |
Table 9: Surface protection spec
MW 2x4 / 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 2x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 209 Mx | 2.1 µWb |
| Pc Coefficient | 1.21 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MW 2x4 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.09 kg | Standard |
| Water (riverbed) |
0.10 kg
(+0.01 kg Buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical wall, the magnet retains just approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin steel (e.g. computer case) significantly limits the holding force.
3. Heat tolerance
*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) = 1.21
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Pros and cons of Nd2Fe14B magnets.
Benefits
- They do not lose magnetism, even over approximately 10 years – the decrease in power is only ~1% (based on measurements),
- Magnets effectively defend themselves against demagnetization caused by foreign field sources,
- By covering with a lustrous coating of gold, the element gains an aesthetic look,
- They feature high magnetic induction at the operating surface, which affects their effectiveness,
- 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...
- In view of the ability of free shaping and adaptation to specialized needs, NdFeB magnets can be modeled in a broad palette of geometric configurations, which amplifies use scope,
- Key role in modern industrial fields – they serve a role in mass storage devices, electromotive mechanisms, advanced medical instruments, and industrial machines.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Cons
- To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and 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 start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- We recommend a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated forms.
- Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, small components of these magnets can complicate diagnosis medical when they are in the body.
- With mass production the cost of neodymium magnets is economically unviable,
Pull force analysis
Best holding force of the magnet in ideal parameters – what it depends on?
- with the contact of a yoke made of special test steel, ensuring maximum field concentration
- whose thickness reaches at least 10 mm
- characterized by lack of roughness
- without any air gap between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- at standard ambient temperature
Practical lifting capacity: influencing factors
- Clearance – existence of foreign body (paint, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
- Material type – the best choice is pure iron steel. Stainless steels may attract less.
- Base smoothness – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
- Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.
Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.
H&S for magnets
Eye protection
Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.
Physical harm
Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!
GPS and phone interference
A strong magnetic field negatively affects the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets close to a device to prevent breaking the sensors.
Demagnetization risk
Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. Damage is permanent.
Allergic reactions
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, cease handling magnets and wear gloves.
Dust explosion hazard
Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.
Caution required
Use magnets consciously. Their immense force can shock even experienced users. Plan your moves and respect their force.
Data carriers
Do not bring magnets close to a purse, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.
Implant safety
Individuals with a heart stimulator should maintain an safe separation from magnets. The magnetism can disrupt the operation of the implant.
No play value
These products are not suitable for play. Eating several magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and requires urgent medical intervention.
