MW 3x2 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010064
GTIN/EAN: 5906301810636
Diameter Ø
3 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
0.11 g
Magnetization Direction
↑ axial
Load capacity
0.30 kg / 2.99 N
Magnetic Induction
493.99 mT / 4940 Gs
Coating
[NiCuNi] Nickel
0.1476 ZŁ with VAT / pcs + price for transport
0.1200 ZŁ net + 23% VAT / pcs
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Product card - MW 3x2 / N38 - cylindrical magnet
Specification / characteristics - MW 3x2 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010064 |
| GTIN/EAN | 5906301810636 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 3 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 0.11 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.30 kg / 2.99 N |
| Magnetic Induction ~ ? | 493.99 mT / 4940 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 modeling of the assembly - report
The following data represent the outcome of a mathematical calculation. Values rely on algorithms for the class Nd2Fe14B. Actual parameters may differ. Please consider these data as a reference point when designing systems.
Table 1: Static pull force (force vs distance) - power drop
MW 3x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4928 Gs
492.8 mT
|
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
weak grip |
| 1 mm |
2106 Gs
210.6 mT
|
0.05 kg / 0.12 LBS
54.8 g / 0.5 N
|
weak grip |
| 2 mm |
845 Gs
84.5 mT
|
0.01 kg / 0.02 LBS
8.8 g / 0.1 N
|
weak grip |
| 3 mm |
393 Gs
39.3 mT
|
0.00 kg / 0.00 LBS
1.9 g / 0.0 N
|
weak grip |
| 5 mm |
124 Gs
12.4 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
weak grip |
| 10 mm |
21 Gs
2.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 15 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Vertical load (wall)
MW 3x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.06 kg / 0.13 LBS
60.0 g / 0.6 N
|
| 1 mm | Stal (~0.2) |
0.01 kg / 0.02 LBS
10.0 g / 0.1 N
|
| 2 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 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 (shearing) - behavior on slippery surfaces
MW 3x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.06 kg / 0.13 LBS
60.0 g / 0.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.03 kg / 0.07 LBS
30.0 g / 0.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.15 kg / 0.33 LBS
150.0 g / 1.5 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MW 3x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.03 kg / 0.07 LBS
30.0 g / 0.3 N
|
| 1 mm |
|
0.08 kg / 0.17 LBS
75.0 g / 0.7 N
|
| 2 mm |
|
0.15 kg / 0.33 LBS
150.0 g / 1.5 N
|
| 3 mm |
|
0.22 kg / 0.50 LBS
225.0 g / 2.2 N
|
| 5 mm |
|
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
| 10 mm |
|
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
| 11 mm |
|
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
| 12 mm |
|
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MW 3x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
OK |
| 40 °C | -2.2% |
0.29 kg / 0.65 LBS
293.4 g / 2.9 N
|
OK |
| 60 °C | -4.4% |
0.29 kg / 0.63 LBS
286.8 g / 2.8 N
|
OK |
| 80 °C | -6.6% |
0.28 kg / 0.62 LBS
280.2 g / 2.7 N
|
|
| 100 °C | -28.8% |
0.21 kg / 0.47 LBS
213.6 g / 2.1 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 3x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.06 kg / 2.33 LBS
5 766 Gs
|
0.16 kg / 0.35 LBS
159 g / 1.6 N
|
N/A |
| 1 mm |
0.49 kg / 1.08 LBS
6 712 Gs
|
0.07 kg / 0.16 LBS
74 g / 0.7 N
|
0.44 kg / 0.97 LBS
~0 Gs
|
| 2 mm |
0.19 kg / 0.43 LBS
4 213 Gs
|
0.03 kg / 0.06 LBS
29 g / 0.3 N
|
0.17 kg / 0.38 LBS
~0 Gs
|
| 3 mm |
0.08 kg / 0.17 LBS
2 629 Gs
|
0.01 kg / 0.02 LBS
11 g / 0.1 N
|
0.07 kg / 0.15 LBS
~0 Gs
|
| 5 mm |
0.01 kg / 0.03 LBS
1 131 Gs
|
0.00 kg / 0.00 LBS
2 g / 0.0 N
|
0.01 kg / 0.03 LBS
~0 Gs
|
| 10 mm |
0.00 kg / 0.00 LBS
248 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 LBS
41 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
3 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
2 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
1 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
1 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
1 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
0 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
MW 3x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 2.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 1.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 1.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 1.0 cm |
| Car key | 50 Gs (5.0 mT) | 1.0 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) - warning
MW 3x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
52.67 km/h
(14.63 m/s)
|
0.01 J | |
| 30 mm |
91.22 km/h
(25.34 m/s)
|
0.04 J | |
| 50 mm |
117.77 km/h
(32.71 m/s)
|
0.06 J | |
| 100 mm |
166.55 km/h
(46.26 m/s)
|
0.12 J |
Table 9: Anti-corrosion coating durability
MW 3x2 / 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 (Flux)
MW 3x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 353 Mx | 3.5 µWb |
| Pc Coefficient | 0.71 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MW 3x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.30 kg | Standard |
| Water (riverbed) |
0.34 kg
(+0.04 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical surface, the magnet retains just approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Power loss vs temp
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.71
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Pros and cons of neodymium magnets.
Advantages
- They have stable power, and over around ten years their performance decreases symbolically – ~1% (according to theory),
- Magnets very well resist against loss of magnetization caused by external fields,
- In other words, due to the metallic layer of gold, the element becomes visually attractive,
- Magnets are characterized by huge magnetic induction on the working surface,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Thanks to modularity in forming and the ability to adapt to unusual requirements,
- Wide application in electronics industry – they are commonly used in HDD drives, motor assemblies, medical equipment, and other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions
Cons
- At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets lose their strength 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 durability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
- Limited possibility of creating nuts in the magnet and complicated forms - preferred is a housing - magnetic holder.
- Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical in case of swallowing.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Maximum lifting capacity of the magnet – what contributes to it?
- on a block made of structural steel, optimally conducting the magnetic field
- with a cross-section no less than 10 mm
- with an ground touching surface
- under conditions of no distance (metal-to-metal)
- during detachment in a direction vertical to the mounting surface
- at ambient temperature room level
Impact of factors on magnetic holding capacity in practice
- Distance – existence of foreign body (rust, tape, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
- Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Steel grade – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
- Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
- Thermal environment – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.
Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.
Safe handling of neodymium magnets
Fire warning
Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
ICD Warning
For implant holders: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.
Bodily injuries
Large magnets can smash fingers instantly. Never place your hand between two attracting surfaces.
Handling rules
Be careful. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can react.
Cards and drives
Equipment safety: Strong magnets can damage payment cards and delicate electronics (pacemakers, medical aids, timepieces).
GPS Danger
A powerful magnetic field disrupts the functioning of magnetometers in phones and GPS navigation. Do not bring magnets close to a device to prevent breaking the sensors.
No play value
NdFeB magnets are not suitable for play. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which poses a severe health hazard and requires immediate surgery.
Nickel coating and allergies
Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction appears, immediately stop working with magnets and use protective gear.
Do not overheat magnets
Keep cool. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).
Magnets are brittle
Despite metallic appearance, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.
