MW 4x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010075
GTIN/EAN: 5906301810742
Diameter Ø
4 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
0.94 g
Magnetization Direction
↑ axial
Load capacity
0.32 kg / 3.16 N
Magnetic Induction
606.05 mT / 6061 Gs
Coating
[NiCuNi] Nickel
0.800 ZŁ with VAT / pcs + price for transport
0.650 ZŁ net + 23% VAT / pcs
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Technical of the product - MW 4x10 / N38 - cylindrical magnet
Specification / characteristics - MW 4x10 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010075 |
| GTIN/EAN | 5906301810742 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 4 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 0.94 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.32 kg / 3.16 N |
| Magnetic Induction ~ ? | 606.05 mT / 6061 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 simulation of the assembly - report
The following values represent the outcome of a physical calculation. Results are based on models for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.
Table 1: Static force (force vs gap) - interaction chart
MW 4x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6049 Gs
604.9 mT
|
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
|
safe |
| 1 mm |
3327 Gs
332.7 mT
|
0.10 kg / 0.21 pounds
96.8 g / 0.9 N
|
safe |
| 2 mm |
1732 Gs
173.2 mT
|
0.03 kg / 0.06 pounds
26.2 g / 0.3 N
|
safe |
| 3 mm |
969 Gs
96.9 mT
|
0.01 kg / 0.02 pounds
8.2 g / 0.1 N
|
safe |
| 5 mm |
389 Gs
38.9 mT
|
0.00 kg / 0.00 pounds
1.3 g / 0.0 N
|
safe |
| 10 mm |
90 Gs
9.0 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
safe |
| 15 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 20 mm |
17 Gs
1.7 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 30 mm |
6 Gs
0.6 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Sliding capacity (wall)
MW 4x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.06 kg / 0.14 pounds
64.0 g / 0.6 N
|
| 1 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
20.0 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: Wall mounting (sliding) - behavior on slippery surfaces
MW 4x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.10 kg / 0.21 pounds
96.0 g / 0.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.06 kg / 0.14 pounds
64.0 g / 0.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.03 kg / 0.07 pounds
32.0 g / 0.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
|
Table 4: Steel thickness (saturation) - power losses
MW 4x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.03 kg / 0.07 pounds
32.0 g / 0.3 N
|
| 1 mm |
|
0.08 kg / 0.18 pounds
80.0 g / 0.8 N
|
| 2 mm |
|
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
|
| 3 mm |
|
0.24 kg / 0.53 pounds
240.0 g / 2.4 N
|
| 5 mm |
|
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
|
| 10 mm |
|
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
|
| 11 mm |
|
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
|
| 12 mm |
|
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MW 4x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.32 kg / 0.71 pounds
320.0 g / 3.1 N
|
OK |
| 40 °C | -2.2% |
0.31 kg / 0.69 pounds
313.0 g / 3.1 N
|
OK |
| 60 °C | -4.4% |
0.31 kg / 0.67 pounds
305.9 g / 3.0 N
|
OK |
| 80 °C | -6.6% |
0.30 kg / 0.66 pounds
298.9 g / 2.9 N
|
|
| 100 °C | -28.8% |
0.23 kg / 0.50 pounds
227.8 g / 2.2 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 4x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.83 kg / 6.25 pounds
6 138 Gs
|
0.43 kg / 0.94 pounds
425 g / 4.2 N
|
N/A |
| 1 mm |
1.63 kg / 3.59 pounds
9 174 Gs
|
0.24 kg / 0.54 pounds
244 g / 2.4 N
|
1.47 kg / 3.23 pounds
~0 Gs
|
| 2 mm |
0.86 kg / 1.89 pounds
6 655 Gs
|
0.13 kg / 0.28 pounds
129 g / 1.3 N
|
0.77 kg / 1.70 pounds
~0 Gs
|
| 3 mm |
0.44 kg / 0.97 pounds
4 777 Gs
|
0.07 kg / 0.15 pounds
66 g / 0.7 N
|
0.40 kg / 0.88 pounds
~0 Gs
|
| 5 mm |
0.13 kg / 0.28 pounds
2 561 Gs
|
0.02 kg / 0.04 pounds
19 g / 0.2 N
|
0.11 kg / 0.25 pounds
~0 Gs
|
| 10 mm |
0.01 kg / 0.03 pounds
778 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.02 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 pounds
179 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
19 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
12 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
8 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
6 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
4 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
3 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
MW 4x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.0 cm |
| Mobile device | 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) - collision effects
MW 4x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
18.61 km/h
(5.17 m/s)
|
0.01 J | |
| 30 mm |
32.23 km/h
(8.95 m/s)
|
0.04 J | |
| 50 mm |
41.61 km/h
(11.56 m/s)
|
0.06 J | |
| 100 mm |
58.84 km/h
(16.35 m/s)
|
0.13 J |
Table 9: Surface protection spec
MW 4x10 / 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 4x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 864 Mx | 8.6 µWb |
| Pc Coefficient | 1.31 | High (Stable) |
Table 11: Physics of underwater searching
MW 4x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.32 kg | Standard |
| Water (riverbed) |
0.37 kg
(+0.05 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Thermal stability
*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) = 1.31
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros and cons of Nd2Fe14B magnets.
Strengths
- They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (according to literature),
- They are resistant to demagnetization induced by external field influence,
- The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to present itself better,
- The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- In view of the ability of precise shaping and customization to custom solutions, magnetic components can be modeled in a wide range of geometric configurations, which increases their versatility,
- Wide application in modern industrial fields – they are utilized in mass storage devices, electric drive systems, precision medical tools, and modern systems.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in small systems
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- We suggest a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
- Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
- With mass production the cost of neodymium magnets is a challenge,
Lifting parameters
Maximum lifting capacity of the magnet – what affects it?
- on a plate made of structural steel, effectively closing the magnetic flux
- whose thickness is min. 10 mm
- with an ground touching surface
- with zero gap (no paint)
- for force acting at a right angle (pull-off, not shear)
- in stable room temperature
Impact of factors on magnetic holding capacity in practice
- Clearance – the presence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
- Direction of force – maximum parameter is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Metal type – different alloys reacts the same. High carbon content weaken the attraction effect.
- Smoothness – full contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate lowers the holding force.
Warnings
Nickel allergy
A percentage of the population have a hypersensitivity to Ni, which is the standard coating for NdFeB magnets. Frequent touching may cause an allergic reaction. We strongly advise use safety gloves.
Operating temperature
Keep cool. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).
Bodily injuries
Large magnets can break fingers in a fraction of a second. Under no circumstances place your hand between two strong magnets.
Fire warning
Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.
Material brittleness
Neodymium magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets leads to them shattering into shards.
Danger to the youngest
These products are not suitable for play. Eating multiple magnets can lead to them pinching intestinal walls, which constitutes a critical condition and requires immediate surgery.
Protect data
Do not bring magnets near a wallet, computer, or TV. The magnetism can destroy these devices and wipe information from cards.
Phone sensors
Be aware: neodymium magnets generate a field that interferes with precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.
Health Danger
Warning for patients: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.
Handling guide
Use magnets consciously. Their huge power can surprise even professionals. Plan your moves and respect their force.
