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
bulk discounts:
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Technical - 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 |
Engineering analysis of the product - report
The following values represent the result of a engineering analysis. Results are based on algorithms for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Treat these calculations as a reference point when designing systems.
Table 1: Static pull force (pull vs distance) - characteristics
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 pounds
410.0 g / 4.0 N
|
weak grip |
| 1 mm |
3189 Gs
318.9 mT
|
0.12 kg / 0.27 pounds
121.7 g / 1.2 N
|
weak grip |
| 2 mm |
1631 Gs
163.1 mT
|
0.03 kg / 0.07 pounds
31.8 g / 0.3 N
|
weak grip |
| 3 mm |
894 Gs
89.4 mT
|
0.01 kg / 0.02 pounds
9.6 g / 0.1 N
|
weak grip |
| 5 mm |
343 Gs
34.3 mT
|
0.00 kg / 0.00 pounds
1.4 g / 0.0 N
|
weak grip |
| 10 mm |
73 Gs
7.3 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
weak grip |
| 15 mm |
26 Gs
2.6 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
13 Gs
1.3 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Vertical load (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 pounds
82.0 g / 0.8 N
|
| 1 mm | Stal (~0.2) |
0.02 kg / 0.05 pounds
24.0 g / 0.2 N
|
| 2 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 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 (shearing) - 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 pounds
123.0 g / 1.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.08 kg / 0.18 pounds
82.0 g / 0.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.04 kg / 0.09 pounds
41.0 g / 0.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.21 kg / 0.45 pounds
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 pounds
41.0 g / 0.4 N
|
| 1 mm |
|
0.10 kg / 0.23 pounds
102.5 g / 1.0 N
|
| 2 mm |
|
0.21 kg / 0.45 pounds
205.0 g / 2.0 N
|
| 3 mm |
|
0.31 kg / 0.68 pounds
307.5 g / 3.0 N
|
| 5 mm |
|
0.41 kg / 0.90 pounds
410.0 g / 4.0 N
|
| 10 mm |
|
0.41 kg / 0.90 pounds
410.0 g / 4.0 N
|
| 11 mm |
|
0.41 kg / 0.90 pounds
410.0 g / 4.0 N
|
| 12 mm |
|
0.41 kg / 0.90 pounds
410.0 g / 4.0 N
|
Table 5: Working in heat (material behavior) - 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 pounds
410.0 g / 4.0 N
|
OK |
| 40 °C | -2.2% |
0.40 kg / 0.88 pounds
401.0 g / 3.9 N
|
OK |
| 60 °C | -4.4% |
0.39 kg / 0.86 pounds
392.0 g / 3.8 N
|
OK |
| 80 °C | -6.6% |
0.38 kg / 0.84 pounds
382.9 g / 3.8 N
|
|
| 100 °C | -28.8% |
0.29 kg / 0.64 pounds
291.9 g / 2.9 N
|
Table 6: Two magnets (repulsion) - field range
MW 4x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.65 kg / 5.85 pounds
6 085 Gs
|
0.40 kg / 0.88 pounds
398 g / 3.9 N
|
N/A |
| 1 mm |
1.51 kg / 3.34 pounds
8 844 Gs
|
0.23 kg / 0.50 pounds
227 g / 2.2 N
|
1.36 kg / 3.01 pounds
~0 Gs
|
| 2 mm |
0.79 kg / 1.74 pounds
6 377 Gs
|
0.12 kg / 0.26 pounds
118 g / 1.2 N
|
0.71 kg / 1.56 pounds
~0 Gs
|
| 3 mm |
0.40 kg / 0.88 pounds
4 541 Gs
|
0.06 kg / 0.13 pounds
60 g / 0.6 N
|
0.36 kg / 0.79 pounds
~0 Gs
|
| 5 mm |
0.11 kg / 0.24 pounds
2 388 Gs
|
0.02 kg / 0.04 pounds
17 g / 0.2 N
|
0.10 kg / 0.22 pounds
~0 Gs
|
| 10 mm |
0.01 kg / 0.02 pounds
687 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 pounds
145 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
14 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
8 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
5 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
4 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
3 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
2 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - 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 |
| Mechanical watch | 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: Collisions (kinetic energy) - collision effects
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: Physics of underwater searching
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. Vertical hold
*Note: On a vertical surface, the magnet retains only a fraction of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.
3. Temperature resistance
*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) = 1.09
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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Pros as well as cons of Nd2Fe14B magnets.
Strengths
- They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
- Magnets effectively protect themselves against loss of magnetization caused by ambient magnetic noise,
- Thanks to the reflective finish, the plating of nickel, gold-plated, or silver-plated gives an clean appearance,
- The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
- Thanks to freedom in forming and the capacity to customize to specific needs,
- Fundamental importance in modern technologies – they are utilized in hard drives, electric motors, advanced medical instruments, also modern systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Weaknesses
- To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as 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 suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
- Limited ability of making threads in the magnet and complex forms - preferred is casing - magnet mounting.
- Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these devices can complicate diagnosis medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Lifting parameters
Highest magnetic holding force – what affects it?
- with the contact of a yoke made of special test steel, guaranteeing full magnetic saturation
- whose thickness reaches at least 10 mm
- characterized by smoothness
- under conditions of gap-free contact (surface-to-surface)
- for force acting at a right angle (pull-off, not shear)
- at conditions approx. 20°C
What influences lifting capacity in practice
- Distance (between the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
- Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
- Plate thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be escaped to the other side.
- Material type – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
- Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
- Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate reduces the load capacity.
Precautions when working with neodymium magnets
Pacemakers
Life threat: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.
Safe operation
Use magnets with awareness. Their huge power can surprise even experienced users. Be vigilant and respect their force.
GPS and phone interference
GPS units and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Risk of cracking
Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.
Physical harm
Mind your fingers. Two large magnets will join immediately with a force of massive weight, destroying everything in their path. Be careful!
Product not for children
Always store magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are tragic.
Thermal limits
Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.
Keep away from computers
Avoid bringing magnets close to a wallet, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.
Nickel coating and allergies
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction occurs, immediately stop working with magnets and wear gloves.
Flammability
Dust generated during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
