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 |
Engineering analysis of the magnet - data
The following data constitute the direct effect of a mathematical calculation. Values are based on algorithms for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Use these data as a supplementary guide for designers.
Table 1: Static force (force vs gap) - 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 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: Vertical load (wall)
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) - behavior on slippery surfaces
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: Steel thickness (substrate influence) - power losses
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 stability (stability) - thermal limit
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: Magnet-Magnet interaction (repulsion) - field collision
MW 4x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear 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 (electronics) - precautionary measures
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: Dynamics (cracking risk) - 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: Electrical 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. Wall mount (shear)
*Caution: On a vertical surface, the magnet holds just approx. 20-30% of its nominal pull.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) significantly reduces the holding force.
3. Temperature resistance
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.09
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Pros as well as cons of Nd2Fe14B magnets.
Benefits
- They retain magnetic properties for almost ten years – the drop is just ~1% (according to analyses),
- They have excellent resistance to weakening of magnetic properties due to external fields,
- In other words, due to the smooth layer of silver, the element gains a professional look,
- Magnets exhibit maximum magnetic induction on the outer layer,
- Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to modularity in constructing and the ability to modify to client solutions,
- Huge importance in modern technologies – they serve a role in magnetic memories, drive modules, diagnostic systems, as well as complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in compact constructions
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
- When exposed to high temperature, neodymium magnets suffer a drop in force. 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
- Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Due to limitations in producing threads and complex shapes in magnets, we recommend using casing - magnetic mount.
- Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical when they are in the body.
- With mass production the cost of neodymium magnets can be a barrier,
Holding force characteristics
Magnetic strength at its maximum – what affects it?
- with the application of a yoke made of special test steel, ensuring maximum field concentration
- whose thickness is min. 10 mm
- characterized by lack of roughness
- with zero gap (no impurities)
- for force applied at a right angle (pull-off, not shear)
- in neutral thermal conditions
Lifting capacity in real conditions – factors
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Plate material – mild steel attracts best. Alloy admixtures decrease magnetic properties and holding force.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
- Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.
Precautions when working with neodymium magnets
Warning for allergy sufferers
Some people experience a sensitization to nickel, which is the common plating for NdFeB magnets. Extended handling may cause an allergic reaction. It is best to use protective gloves.
Adults only
Only for adults. Tiny parts can be swallowed, causing serious injuries. Keep away from kids and pets.
Powerful field
Handle magnets with awareness. Their powerful strength can shock even experienced users. Stay alert and respect their force.
Danger to pacemakers
For implant holders: Powerful magnets affect medical devices. Keep minimum 30 cm distance or request help to work with the magnets.
Fire risk
Machining of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Data carriers
Avoid bringing magnets close to a purse, computer, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.
Magnet fragility
NdFeB magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them breaking into shards.
Serious injuries
Large magnets can crush fingers in a fraction of a second. Do not put your hand between two strong magnets.
Phone sensors
An intense magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Maintain magnets near a smartphone to avoid breaking the sensors.
Do not overheat magnets
Regular neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. Damage is permanent.
