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 data 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 |
Engineering simulation of the assembly - technical parameters
These information represent the direct effect of a physical simulation. Values rely on algorithms for the class Nd2Fe14B. Operational conditions may differ from theoretical values. Treat these calculations as a reference point during assembly planning.
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 pounds
90.0 g / 0.9 N
|
weak grip |
| 1 mm |
1696 Gs
169.6 mT
|
0.01 kg / 0.02 pounds
7.3 g / 0.1 N
|
weak grip |
| 2 mm |
570 Gs
57.0 mT
|
0.00 kg / 0.00 pounds
0.8 g / 0.0 N
|
weak grip |
| 3 mm |
256 Gs
25.6 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
weak grip |
| 5 mm |
82 Gs
8.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 10 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 15 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Vertical capacity (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 pounds
18.0 g / 0.2 N
|
| 1 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 2 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 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: Vertical assembly (sliding) - 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 pounds
27.0 g / 0.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.02 kg / 0.04 pounds
18.0 g / 0.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.01 kg / 0.02 pounds
9.0 g / 0.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.05 kg / 0.10 pounds
45.0 g / 0.4 N
|
Table 4: Material efficiency (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 pounds
9.0 g / 0.1 N
|
| 1 mm |
|
0.02 kg / 0.05 pounds
22.5 g / 0.2 N
|
| 2 mm |
|
0.05 kg / 0.10 pounds
45.0 g / 0.4 N
|
| 3 mm |
|
0.07 kg / 0.15 pounds
67.5 g / 0.7 N
|
| 5 mm |
|
0.09 kg / 0.20 pounds
90.0 g / 0.9 N
|
| 10 mm |
|
0.09 kg / 0.20 pounds
90.0 g / 0.9 N
|
| 11 mm |
|
0.09 kg / 0.20 pounds
90.0 g / 0.9 N
|
| 12 mm |
|
0.09 kg / 0.20 pounds
90.0 g / 0.9 N
|
Table 5: Thermal stability (stability) - thermal limit
MW 2x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.09 kg / 0.20 pounds
90.0 g / 0.9 N
|
OK |
| 40 °C | -2.2% |
0.09 kg / 0.19 pounds
88.0 g / 0.9 N
|
OK |
| 60 °C | -4.4% |
0.09 kg / 0.19 pounds
86.0 g / 0.8 N
|
OK |
| 80 °C | -6.6% |
0.08 kg / 0.19 pounds
84.1 g / 0.8 N
|
|
| 100 °C | -28.8% |
0.06 kg / 0.14 pounds
64.1 g / 0.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
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 pounds
6 090 Gs
|
0.10 kg / 0.23 pounds
103 g / 1.0 N
|
N/A |
| 1 mm |
0.21 kg / 0.46 pounds
6 559 Gs
|
0.03 kg / 0.07 pounds
31 g / 0.3 N
|
0.19 kg / 0.41 pounds
~0 Gs
|
| 2 mm |
0.06 kg / 0.12 pounds
3 391 Gs
|
0.01 kg / 0.02 pounds
8 g / 0.1 N
|
0.05 kg / 0.11 pounds
~0 Gs
|
| 3 mm |
0.02 kg / 0.04 pounds
1 883 Gs
|
0.00 kg / 0.01 pounds
3 g / 0.0 N
|
0.02 kg / 0.03 pounds
~0 Gs
|
| 5 mm |
0.00 kg / 0.01 pounds
743 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 10 mm |
0.00 kg / 0.00 pounds
165 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 pounds
30 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
3 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
2 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
1 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
1 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
0 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
0 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Hazards (electronics) - 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 |
| 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 (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: 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 (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. Sliding resistance
*Warning: On a vertical wall, the magnet holds just approx. 20-30% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) drastically weakens the holding force.
3. Heat tolerance
*For standard magnets, the max working temp 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% |
Ecology and recycling (GPSR)
| 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 Nd2Fe14B magnets.
Advantages
- They do not lose magnetism, even during nearly 10 years – the drop in power is only ~1% (according to tests),
- Magnets perfectly defend themselves against demagnetization caused by ambient magnetic noise,
- Thanks to the glossy finish, the coating of Ni-Cu-Ni, gold-plated, or silver-plated gives an clean appearance,
- Magnetic induction on the working layer of the magnet is 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 freedom in shaping and the ability to customize to specific needs,
- Significant place in high-tech industry – they serve a role in magnetic memories, electric drive systems, precision medical tools, as well as other advanced devices.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Limitations
- To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- Limited possibility of making nuts in the magnet and complicated forms - preferred is casing - magnet mounting.
- Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Maximum magnetic pulling force – what contributes to it?
- on a plate made of mild steel, effectively closing the magnetic field
- whose thickness is min. 10 mm
- characterized by even structure
- with zero gap (without impurities)
- during detachment in a direction vertical to the mounting surface
- at conditions approx. 20°C
Practical aspects of lifting capacity – factors
- Gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
- Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
- Plate thickness – too thin steel does not close the flux, causing part of the power to be escaped to the other side.
- Plate material – mild steel attracts best. Higher carbon content decrease magnetic permeability and holding force.
- Smoothness – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
- Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.
Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the holding force is lower. In addition, even a small distance between the magnet and the plate reduces the lifting capacity.
Safe handling of NdFeB magnets
Bodily injuries
Big blocks can smash fingers instantly. Under no circumstances place your hand between two attracting surfaces.
Fire warning
Powder produced during cutting of magnets is combustible. Do not drill into magnets unless you are an expert.
Product not for children
NdFeB magnets are not suitable for play. Swallowing a few magnets may result in them connecting inside the digestive tract, which poses a severe health hazard and necessitates immediate surgery.
Respect the power
Handle magnets consciously. Their powerful strength can shock even experienced users. Stay alert and do not underestimate their force.
Impact on smartphones
A strong magnetic field disrupts the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets close to a smartphone to prevent breaking the sensors.
Permanent damage
Avoid heat. Neodymium magnets are sensitive to temperature. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).
Magnets are brittle
Watch out for shards. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.
Data carriers
Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).
Avoid contact if allergic
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, cease handling magnets and use protective gear.
ICD Warning
Patients with a ICD must keep an safe separation from magnets. The magnetic field can disrupt the operation of the life-saving device.
