MW 38x3.5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010062
GTIN/EAN: 5906301810612
Diameter Ø
38 mm [±0,1 mm]
Height
3.5 mm [±0,1 mm]
Weight
29.77 g
Magnetization Direction
↑ axial
Load capacity
5.09 kg / 49.91 N
Magnetic Induction
112.31 mT / 1123 Gs
Coating
[NiCuNi] Nickel
15.83 ZŁ with VAT / pcs + price for transport
12.87 ZŁ net + 23% VAT / pcs
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Product card - MW 38x3.5 / N38 - cylindrical magnet
Specification / characteristics - MW 38x3.5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010062 |
| GTIN/EAN | 5906301810612 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 38 mm [±0,1 mm] |
| Height | 3.5 mm [±0,1 mm] |
| Weight | 29.77 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 5.09 kg / 49.91 N |
| Magnetic Induction ~ ? | 112.31 mT / 1123 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 assembly - technical parameters
The following values are the direct effect of a mathematical calculation. Results rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Please consider these data as a supplementary guide when designing systems.
Table 1: Static pull force (pull vs distance) - interaction chart
MW 38x3.5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
1123 Gs
112.3 mT
|
5.09 kg / 5090.0 g
49.9 N
|
strong |
| 1 mm |
1103 Gs
110.3 mT
|
4.91 kg / 4910.1 g
48.2 N
|
strong |
| 2 mm |
1075 Gs
107.5 mT
|
4.66 kg / 4663.0 g
45.7 N
|
strong |
| 3 mm |
1040 Gs
104.0 mT
|
4.36 kg / 4364.2 g
42.8 N
|
strong |
| 5 mm |
954 Gs
95.4 mT
|
3.67 kg / 3673.1 g
36.0 N
|
strong |
| 10 mm |
703 Gs
70.3 mT
|
2.00 kg / 1997.1 g
19.6 N
|
safe |
| 15 mm |
483 Gs
48.3 mT
|
0.94 kg / 943.2 g
9.3 N
|
safe |
| 20 mm |
326 Gs
32.6 mT
|
0.43 kg / 429.7 g
4.2 N
|
safe |
| 30 mm |
155 Gs
15.5 mT
|
0.10 kg / 97.1 g
1.0 N
|
safe |
| 50 mm |
47 Gs
4.7 mT
|
0.01 kg / 8.9 g
0.1 N
|
safe |
Table 2: Slippage load (wall)
MW 38x3.5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.02 kg / 1018.0 g
10.0 N
|
| 1 mm | Stal (~0.2) |
0.98 kg / 982.0 g
9.6 N
|
| 2 mm | Stal (~0.2) |
0.93 kg / 932.0 g
9.1 N
|
| 3 mm | Stal (~0.2) |
0.87 kg / 872.0 g
8.6 N
|
| 5 mm | Stal (~0.2) |
0.73 kg / 734.0 g
7.2 N
|
| 10 mm | Stal (~0.2) |
0.40 kg / 400.0 g
3.9 N
|
| 15 mm | Stal (~0.2) |
0.19 kg / 188.0 g
1.8 N
|
| 20 mm | Stal (~0.2) |
0.09 kg / 86.0 g
0.8 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 20.0 g
0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 2.0 g
0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 38x3.5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.53 kg / 1527.0 g
15.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.02 kg / 1018.0 g
10.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.51 kg / 509.0 g
5.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.55 kg / 2545.0 g
25.0 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 38x3.5 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
0.51 kg / 509.0 g
5.0 N
|
| 1 mm |
|
1.27 kg / 1272.5 g
12.5 N
|
| 2 mm |
|
2.55 kg / 2545.0 g
25.0 N
|
| 5 mm |
|
5.09 kg / 5090.0 g
49.9 N
|
| 10 mm |
|
5.09 kg / 5090.0 g
49.9 N
|
Table 5: Thermal resistance (material behavior) - thermal limit
MW 38x3.5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
5.09 kg / 5090.0 g
49.9 N
|
OK |
| 40 °C | -2.2% |
4.98 kg / 4978.0 g
48.8 N
|
OK |
| 60 °C | -4.4% |
4.87 kg / 4866.0 g
47.7 N
|
|
| 80 °C | -6.6% |
4.75 kg / 4754.1 g
46.6 N
|
|
| 100 °C | -28.8% |
3.62 kg / 3624.1 g
35.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 38x3.5 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
8.82 kg / 8818 g
86.5 N
2 143 Gs
|
N/A |
| 1 mm |
8.68 kg / 8679 g
85.1 N
2 228 Gs
|
7.81 kg / 7811 g
76.6 N
~0 Gs
|
| 2 mm |
8.51 kg / 8507 g
83.5 N
2 206 Gs
|
7.66 kg / 7656 g
75.1 N
~0 Gs
|
| 3 mm |
8.31 kg / 8306 g
81.5 N
2 180 Gs
|
7.47 kg / 7475 g
73.3 N
~0 Gs
|
| 5 mm |
7.83 kg / 7829 g
76.8 N
2 116 Gs
|
7.05 kg / 7046 g
69.1 N
~0 Gs
|
| 10 mm |
6.36 kg / 6364 g
62.4 N
1 908 Gs
|
5.73 kg / 5727 g
56.2 N
~0 Gs
|
| 20 mm |
3.46 kg / 3460 g
33.9 N
1 407 Gs
|
3.11 kg / 3114 g
30.5 N
~0 Gs
|
| 50 mm |
0.35 kg / 346 g
3.4 N
445 Gs
|
0.31 kg / 312 g
3.1 N
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MW 38x3.5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 11.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 9.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 7.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 5.5 cm |
| Remote | 50 Gs (5.0 mT) | 5.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Collisions (cracking risk) - collision effects
MW 38x3.5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.10 km/h
(4.47 m/s)
|
0.30 J | |
| 30 mm |
23.11 km/h
(6.42 m/s)
|
0.61 J | |
| 50 mm |
29.52 km/h
(8.20 m/s)
|
1.00 J | |
| 100 mm |
41.70 km/h
(11.58 m/s)
|
2.00 J |
Table 9: Coating parameters (durability)
MW 38x3.5 / 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 38x3.5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 17 022 Mx | 170.2 µWb |
| Pc Coefficient | 0.14 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MW 38x3.5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 5.09 kg | Standard |
| Water (riverbed) |
5.83 kg
(+0.74 kg Buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical wall, the magnet holds just approx. 20-30% of its max power.
2. Plate thickness effect
*Thin steel (e.g. computer case) drastically reduces the holding force.
3. Power loss vs temp
*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) = 0.14
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Pros and cons of rare earth magnets.
Strengths
- They retain attractive force for nearly 10 years – the loss is just ~1% (in theory),
- They possess excellent resistance to weakening of magnetic properties when exposed to external magnetic sources,
- In other words, due to the glossy surface of nickel, the element becomes visually attractive,
- They feature high magnetic induction at the operating surface, which improves attraction properties,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Thanks to the potential of accurate shaping and adaptation to custom solutions, neodymium magnets can be modeled in a variety of geometric configurations, which expands the range of possible applications,
- Significant place in advanced technology sectors – they are utilized in data components, drive modules, diagnostic systems, and industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
- Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- Limited possibility of creating nuts in the magnet and complicated shapes - preferred is casing - mounting mechanism.
- Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
- Due to expensive raw materials, their price is higher than average,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- on a base made of structural steel, perfectly concentrating the magnetic flux
- whose thickness is min. 10 mm
- with a surface perfectly flat
- without any insulating layer between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- in stable room temperature
Determinants of lifting force in real conditions
- Distance – the presence of any layer (paint, dirt, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
- Direction of force – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
- Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be escaped into the air.
- Metal type – different alloys reacts the same. High carbon content worsen the attraction effect.
- Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.
Safety rules for work with NdFeB magnets
Keep away from electronics
A powerful magnetic field interferes with the operation of magnetometers in phones and GPS navigation. Keep magnets near a device to avoid breaking the sensors.
Flammability
Mechanical processing of NdFeB material carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Warning for allergy sufferers
Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, immediately stop handling magnets and use protective gear.
Do not underestimate power
Handle with care. Rare earth magnets act from a distance and connect with huge force, often quicker than you can move away.
Physical harm
Risk of injury: The pulling power is so great that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
Magnetic media
Equipment safety: Neodymium magnets can damage payment cards and delicate electronics (heart implants, medical aids, timepieces).
Power loss in heat
Monitor thermal conditions. Heating the magnet to high heat will destroy its properties and strength.
Health Danger
For implant holders: Powerful magnets affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.
Do not give to children
These products are not toys. Accidental ingestion of a few magnets can lead to them attracting across intestines, which poses a direct threat to life and necessitates urgent medical intervention.
Shattering risk
Protect your eyes. Magnets can fracture upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.
