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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Technical details - 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 |
Physical modeling of the magnet - report
The following data constitute the result of a physical analysis. Results were calculated on models for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs gap) - interaction chart
MW 2x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5954 Gs
595.4 mT
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
weak grip |
| 1 mm |
1696 Gs
169.6 mT
|
0.01 kg / 0.02 LBS
7.3 g / 0.1 N
|
weak grip |
| 2 mm |
570 Gs
57.0 mT
|
0.00 kg / 0.00 LBS
0.8 g / 0.0 N
|
weak grip |
| 3 mm |
256 Gs
25.6 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
weak grip |
| 5 mm |
82 Gs
8.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 10 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 15 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Shear force (wall)
MW 2x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
18.0 g / 0.2 N
|
| 1 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 2 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 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: Vertical assembly (sliding) - vertical pull
MW 2x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.03 kg / 0.06 LBS
27.0 g / 0.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.02 kg / 0.04 LBS
18.0 g / 0.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.01 kg / 0.02 LBS
9.0 g / 0.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.05 kg / 0.10 LBS
45.0 g / 0.4 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 2x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.01 kg / 0.02 LBS
9.0 g / 0.1 N
|
| 1 mm |
|
0.02 kg / 0.05 LBS
22.5 g / 0.2 N
|
| 2 mm |
|
0.05 kg / 0.10 LBS
45.0 g / 0.4 N
|
| 3 mm |
|
0.07 kg / 0.15 LBS
67.5 g / 0.7 N
|
| 5 mm |
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| 10 mm |
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| 11 mm |
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| 12 mm |
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
Table 5: Thermal resistance (material behavior) - resistance threshold
MW 2x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
OK |
| 40 °C | -2.2% |
0.09 kg / 0.19 LBS
88.0 g / 0.9 N
|
OK |
| 60 °C | -4.4% |
0.09 kg / 0.19 LBS
86.0 g / 0.8 N
|
OK |
| 80 °C | -6.6% |
0.08 kg / 0.19 LBS
84.1 g / 0.8 N
|
|
| 100 °C | -28.8% |
0.06 kg / 0.14 LBS
64.1 g / 0.6 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 2x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
0.69 kg / 1.51 LBS
6 090 Gs
|
0.10 kg / 0.23 LBS
103 g / 1.0 N
|
N/A |
| 1 mm |
0.21 kg / 0.46 LBS
6 559 Gs
|
0.03 kg / 0.07 LBS
31 g / 0.3 N
|
0.19 kg / 0.41 LBS
~0 Gs
|
| 2 mm |
0.06 kg / 0.12 LBS
3 391 Gs
|
0.01 kg / 0.02 LBS
8 g / 0.1 N
|
0.05 kg / 0.11 LBS
~0 Gs
|
| 3 mm |
0.02 kg / 0.04 LBS
1 883 Gs
|
0.00 kg / 0.01 LBS
3 g / 0.0 N
|
0.02 kg / 0.03 LBS
~0 Gs
|
| 5 mm |
0.00 kg / 0.01 LBS
743 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 10 mm |
0.00 kg / 0.00 LBS
165 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 LBS
30 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
3 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
2 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
1 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
1 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
0 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
0 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
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 |
| Timepiece | 20 Gs (2.0 mT) | 1.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 1.0 cm |
| Car key | 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: Collisions (kinetic energy) - collision effects
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: Corrosion resistance
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 (Flux)
MW 2x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 209 Mx | 2.1 µWb |
| Pc Coefficient | 1.21 | High (Stable) |
Table 11: Physics of underwater searching
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. Sliding resistance
*Note: On a vertical surface, the magnet retains only ~20% of its max power.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) significantly limits the holding force.
3. Temperature resistance
*For N38 material, the critical 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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Advantages as well as disadvantages of neodymium magnets.
Benefits
- They do not lose strength, even during nearly 10 years – the drop in strength is only ~1% (theoretically),
- They are noted for resistance to demagnetization induced by external field influence,
- Thanks to the shiny finish, the layer of nickel, gold-plated, or silver gives an professional appearance,
- Magnetic induction on the surface of the magnet is exceptional,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
- Considering the possibility of flexible molding and adaptation to custom needs, magnetic components can be manufactured in a broad palette of geometric configurations, which expands the range of possible applications,
- Universal use in modern technologies – they serve a role in computer drives, drive modules, diagnostic systems, also technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in small systems
Disadvantages
- Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
- When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength 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
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing nuts and complex shapes in magnets, we propose using a housing - magnetic mount.
- Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these devices can complicate diagnosis medical after entering the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities
Holding force characteristics
Optimal lifting capacity of a neodymium magnet – what affects it?
- with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
- whose transverse dimension reaches at least 10 mm
- characterized by smoothness
- without the slightest air gap between the magnet and steel
- under axial force vector (90-degree angle)
- at conditions approx. 20°C
Practical aspects of lifting capacity – factors
- Air gap (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
- Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
- Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped to the other side.
- Steel type – mild steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
- Base smoothness – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
- Thermal environment – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.
Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the holding force.
Safe handling of neodymium magnets
GPS and phone interference
Remember: rare earth magnets generate a field that confuses precision electronics. Keep a separation from your mobile, device, and GPS.
No play value
Always store magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are fatal.
Do not overheat magnets
Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.
Medical interference
Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.
Safe distance
Intense magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.
Fire warning
Powder generated during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.
Handling guide
Handle with care. Neodymium magnets act from a distance and connect with huge force, often quicker than you can move away.
Magnets are brittle
NdFeB magnets are ceramic materials, which means they are prone to chipping. Clashing of two magnets will cause them breaking into shards.
Nickel coating and allergies
Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness happens, cease handling magnets and wear gloves.
Bodily injuries
Big blocks can break fingers in a fraction of a second. Never put your hand between two attracting surfaces.
