MW 4x6 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010078
GTIN/EAN: 5906301810773
Diameter Ø
4 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
0.57 g
Magnetization Direction
↑ axial
Load capacity
0.41 kg / 4.06 N
Magnetic Induction
586.32 mT / 5863 Gs
Coating
[NiCuNi] Nickel
0.381 ZŁ with VAT / pcs + price for transport
0.310 ZŁ net + 23% VAT / pcs
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Technical details - MW 4x6 / N38 - cylindrical magnet
Specification / characteristics - MW 4x6 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010078 |
| GTIN/EAN | 5906301810773 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 4 mm [±0,1 mm] |
| Height | 6 mm [±0,1 mm] |
| Weight | 0.57 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.41 kg / 4.06 N |
| Magnetic Induction ~ ? | 586.32 mT / 5863 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 simulation of the product - technical parameters
Presented data represent the outcome of a mathematical analysis. Values were calculated on models for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Use these data as a preliminary roadmap when designing systems.
Table 1: Static pull force (pull vs distance) - power drop
MW 4x6 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5852 Gs
585.2 mT
|
0.41 kg / 0.90 lbs
410.0 g / 4.0 N
|
safe |
| 1 mm |
3189 Gs
318.9 mT
|
0.12 kg / 0.27 lbs
121.7 g / 1.2 N
|
safe |
| 2 mm |
1631 Gs
163.1 mT
|
0.03 kg / 0.07 lbs
31.8 g / 0.3 N
|
safe |
| 3 mm |
894 Gs
89.4 mT
|
0.01 kg / 0.02 lbs
9.6 g / 0.1 N
|
safe |
| 5 mm |
343 Gs
34.3 mT
|
0.00 kg / 0.00 lbs
1.4 g / 0.0 N
|
safe |
| 10 mm |
73 Gs
7.3 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
safe |
| 15 mm |
26 Gs
2.6 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 20 mm |
13 Gs
1.3 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 30 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Sliding force (vertical surface)
MW 4x6 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.08 kg / 0.18 lbs
82.0 g / 0.8 N
|
| 1 mm | Stal (~0.2) |
0.02 kg / 0.05 lbs
24.0 g / 0.2 N
|
| 2 mm | Stal (~0.2) |
0.01 kg / 0.01 lbs
6.0 g / 0.1 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 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: Wall mounting (sliding) - vertical pull
MW 4x6 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.12 kg / 0.27 lbs
123.0 g / 1.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.08 kg / 0.18 lbs
82.0 g / 0.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.04 kg / 0.09 lbs
41.0 g / 0.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.21 kg / 0.45 lbs
205.0 g / 2.0 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 4x6 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.04 kg / 0.09 lbs
41.0 g / 0.4 N
|
| 1 mm |
|
0.10 kg / 0.23 lbs
102.5 g / 1.0 N
|
| 2 mm |
|
0.21 kg / 0.45 lbs
205.0 g / 2.0 N
|
| 3 mm |
|
0.31 kg / 0.68 lbs
307.5 g / 3.0 N
|
| 5 mm |
|
0.41 kg / 0.90 lbs
410.0 g / 4.0 N
|
| 10 mm |
|
0.41 kg / 0.90 lbs
410.0 g / 4.0 N
|
| 11 mm |
|
0.41 kg / 0.90 lbs
410.0 g / 4.0 N
|
| 12 mm |
|
0.41 kg / 0.90 lbs
410.0 g / 4.0 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MW 4x6 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.41 kg / 0.90 lbs
410.0 g / 4.0 N
|
OK |
| 40 °C | -2.2% |
0.40 kg / 0.88 lbs
401.0 g / 3.9 N
|
OK |
| 60 °C | -4.4% |
0.39 kg / 0.86 lbs
392.0 g / 3.8 N
|
OK |
| 80 °C | -6.6% |
0.38 kg / 0.84 lbs
382.9 g / 3.8 N
|
|
| 100 °C | -28.8% |
0.29 kg / 0.64 lbs
291.9 g / 2.9 N
|
Table 6: Two magnets (attraction) - forces in the system
MW 4x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.65 kg / 5.85 lbs
6 085 Gs
|
0.40 kg / 0.88 lbs
398 g / 3.9 N
|
N/A |
| 1 mm |
1.51 kg / 3.34 lbs
8 844 Gs
|
0.23 kg / 0.50 lbs
227 g / 2.2 N
|
1.36 kg / 3.01 lbs
~0 Gs
|
| 2 mm |
0.79 kg / 1.74 lbs
6 377 Gs
|
0.12 kg / 0.26 lbs
118 g / 1.2 N
|
0.71 kg / 1.56 lbs
~0 Gs
|
| 3 mm |
0.40 kg / 0.88 lbs
4 541 Gs
|
0.06 kg / 0.13 lbs
60 g / 0.6 N
|
0.36 kg / 0.79 lbs
~0 Gs
|
| 5 mm |
0.11 kg / 0.24 lbs
2 388 Gs
|
0.02 kg / 0.04 lbs
17 g / 0.2 N
|
0.10 kg / 0.22 lbs
~0 Gs
|
| 10 mm |
0.01 kg / 0.02 lbs
687 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 lbs
145 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
14 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
8 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
5 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
4 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
3 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
2 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) - warnings
MW 4x6 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.5 cm |
| Car key | 50 Gs (5.0 mT) | 1.5 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) - warning
MW 4x6 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
27.05 km/h
(7.51 m/s)
|
0.02 J | |
| 30 mm |
46.85 km/h
(13.01 m/s)
|
0.05 J | |
| 50 mm |
60.48 km/h
(16.80 m/s)
|
0.08 J | |
| 100 mm |
85.53 km/h
(23.76 m/s)
|
0.16 J |
Table 9: Coating parameters (durability)
MW 4x6 / 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 4x6 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 792 Mx | 7.9 µWb |
| Pc Coefficient | 1.09 | High (Stable) |
Table 11: Submerged application
MW 4x6 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.41 kg | Standard |
| Water (riverbed) |
0.47 kg
(+0.06 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Caution: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Heat tolerance
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.09
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.
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 deals
Pros and cons of neodymium magnets.
Advantages
- Their strength is durable, and after around 10 years it decreases only by ~1% (theoretically),
- Neodymium magnets remain highly resistant to magnetic field loss caused by external magnetic fields,
- Thanks to the reflective finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an clean appearance,
- Magnets possess maximum magnetic induction on the outer side,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of accurate creating as well as adjusting to individual requirements,
- Key role in innovative solutions – they are utilized in HDD drives, brushless drives, medical equipment, as well as technologically advanced constructions.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Limitations
- At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (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 very resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
- We suggest casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
- Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical after entering the body.
- Due to complex production process, their price exceeds standard values,
Pull force analysis
Highest magnetic holding force – what it depends on?
- with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
- whose thickness equals approx. 10 mm
- characterized by lack of roughness
- without the slightest clearance between the magnet and steel
- for force applied at a right angle (in the magnet axis)
- in stable room temperature
Determinants of lifting force in real conditions
- Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Load vector – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
- Plate thickness – too thin sheet causes magnetic saturation, causing part of the flux to be lost to the other side.
- Steel type – low-carbon steel attracts best. Higher carbon content reduce magnetic properties and holding force.
- Smoothness – ideal contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
- Temperature – heating the magnet results in weakening of induction. Check the thermal limit for a given model.
Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet and the plate lowers the load capacity.
Precautions when working with NdFeB magnets
Danger to the youngest
Neodymium magnets are not suitable for play. Eating several magnets can lead to them attracting across intestines, which constitutes a severe health hazard and requires urgent medical intervention.
Pinching danger
Large magnets can crush fingers instantly. Never place your hand between two attracting surfaces.
Do not underestimate power
Use magnets consciously. Their immense force can surprise even experienced users. Be vigilant and respect their power.
Fragile material
Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.
Protect data
Powerful magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Stay away of min. 10 cm.
Phone sensors
Remember: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.
ICD Warning
Warning for patients: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or ask another person to handle the magnets.
Avoid contact if allergic
Medical facts indicate that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact and select coated magnets.
Mechanical processing
Powder generated during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.
Demagnetization risk
Avoid heat. NdFeB magnets are susceptible to temperature. If you need operation above 80°C, inquire about special high-temperature series (H, SH, UH).
