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
- Coating
- [NiCuNi] Nickel
0.209 zł with VAT / pcs + price for transport
0.1700 zł net + 23% VAT / pcs
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Need more?Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical of the product - 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 |
Technical analysis of the magnet - report
The following information are the direct effect of a mathematical simulation. Values are based on algorithms for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Please consider these data as a preliminary roadmap when designing systems.
Table 1: Static force (pull 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
|
safe |
| 1 mm |
1696 Gs
169.6 mT
|
0.01 kg / 0.02 lbs
7.3 g / 0.1 N
|
safe |
| 2 mm |
570 Gs
57.0 mT
|
0.00 kg / 0.00 lbs
0.8 g / 0.0 N
|
safe |
| 3 mm |
256 Gs
25.6 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
safe |
| 5 mm |
82 Gs
8.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 10 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 15 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 20 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 30 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Sliding hold (vertical surface)
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 (shearing) - behavior on slippery surfaces
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: Material efficiency (saturation) - 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 stability (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: Magnet-Magnet interaction (repulsion) - field collision
MW 2x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (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: Hazards (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 |
| Mechanical watch | 20 Gs (2.0 mT) | 1.0 cm |
| Phone / Smartphone | 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: Impact energy (kinetic energy) - collision effects
MW 2x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
10.39 km/h
(2.89 m/s)
|
0.00 J | |
| 30 mm |
10.39 km/h
(2.89 m/s)
|
0.00 J | |
| 50 mm |
10.39 km/h
(2.89 m/s)
|
0.00 J | |
| 100 mm |
10.40 km/h
(2.89 m/s)
|
0.00 J |
Table 9: Anti-corrosion coating durability
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: 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. Wall mount (shear)
*Note: On a vertical wall, the magnet retains merely a fraction of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.
3. Thermal stability
*For standard magnets, 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
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Strengths and weaknesses of neodymium magnets.
Advantages
- They do not lose magnetism, even during around 10 years – the reduction in strength is only ~1% (according to tests),
- They show high resistance to demagnetization induced by external magnetic fields,
- The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to modularity in shaping and the capacity to modify to individual projects,
- Significant place in modern technologies – they are commonly used in data components, electric drive systems, precision medical tools, and industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in compact constructions
Cons
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating nuts and complex shapes in magnets, we propose using a housing - magnetic mount.
- Potential hazard to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical when they are in the body.
- With large orders the cost of neodymium magnets can be a barrier,
Lifting parameters
Maximum magnetic pulling force – what contributes to it?
- on a block made of structural steel, perfectly concentrating the magnetic flux
- whose thickness equals approx. 10 mm
- with an ground touching surface
- under conditions of gap-free contact (metal-to-metal)
- for force acting at a right angle (in the magnet axis)
- at conditions approx. 20°C
Impact of factors on magnetic holding capacity in practice
- Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
- Load vector – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
- Plate material – low-carbon steel gives the best results. Alloy admixtures reduce magnetic properties and lifting capacity.
- Surface quality – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
- Thermal environment – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate lowers the holding force.
H&S for magnets
Electronic devices
Do not bring magnets near a wallet, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.
Machining danger
Powder created during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Sensitization to coating
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, immediately stop handling magnets and wear gloves.
Pinching danger
Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, crushing anything in their path. Be careful!
Shattering risk
Despite the nickel coating, the material is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.
Adults only
Only for adults. Small elements pose a choking risk, causing severe trauma. Store out of reach of kids and pets.
Maximum temperature
Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.
ICD Warning
Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Magnetic interference
Note: rare earth magnets generate a field that interferes with precision electronics. Keep a separation from your phone, device, and GPS.
Conscious usage
Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.
