MW 3x2 zestaw 50 szt. / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010538
GTIN/EAN: 5906301815297
- Diameter Ø
- 3 mm [±0,1 mm]
- Height
- 2 mm [±0,1 mm]
- Weight
- 5.5 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
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Need more?Frequently asked questions
Where can I buy strong cylindrical neodymium magnets?
Can a small cylindrical magnet provide a strong grip for precise workshop work?
Which cylindrical magnet can work at a higher temperature?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical - MW 3x2 zestaw 50 szt. / N38 - cylindrical magnet
Specification / characteristics - MW 3x2 zestaw 50 szt. / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010538 |
| GTIN/EAN | 5906301815297 |
| Distributor | 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 | 5.5 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 |
|---|---|---|
| Remanence Br ? | 12.2-12.6 | kGs |
| Remanence Br ? | 1220-1260 | mT |
| Coercivity bHc ? | 10.8-11.5 | kOe |
| Coercivity bHc ? | 860-915 | kA/m |
| Intrinsic coercivity iHc | ≥ 12 | kOe |
| Intrinsic coercivity iHc | ≥ 955 | kA/m |
| Energy product BHmax ? | 36-38 | BH max MGOe |
| Energy product BHmax ? | 287-303 | BH max KJ/m |
| Maximum working 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 modeling of the magnet - data
These values constitute the direct effect of a mathematical analysis. Values were calculated on models for the class Nd2Fe14B. Real-world performance might slightly differ. Treat these data as a reference point when designing systems.
Table 1: Static pull force (force vs distance) - power drop
MW 3x2 zestaw 50 szt. / 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
|
low risk |
| 1 mm |
2106 Gs
210.6 mT
|
0.05 kg / 0.12 LBS
54.8 g / 0.5 N
|
low risk |
| 2 mm |
845 Gs
84.5 mT
|
0.01 kg / 0.02 LBS
8.8 g / 0.1 N
|
low risk |
| 3 mm |
393 Gs
39.3 mT
|
0.00 kg / 0.00 LBS
1.9 g / 0.0 N
|
low risk |
| 5 mm |
124 Gs
12.4 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
low risk |
| 10 mm |
21 Gs
2.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 15 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 20 mm |
3 Gs
0.3 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 30 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Shear load (vertical surface)
MW 3x2 zestaw 50 szt. / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Raw steel (µ ≈ 0.2) |
0.06 kg / 0.13 LBS
60.0 g / 0.6 N
|
| 1 mm | Raw steel (µ ≈ 0.2) |
0.01 kg / 0.02 LBS
10.0 g / 0.1 N
|
| 2 mm | Raw steel (µ ≈ 0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 3 mm | Raw steel (µ ≈ 0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 5 mm | Raw steel (µ ≈ 0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 10 mm | Raw steel (µ ≈ 0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 15 mm | Raw steel (µ ≈ 0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 20 mm | Raw steel (µ ≈ 0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 30 mm | Raw steel (µ ≈ 0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 50 mm | Raw steel (µ ≈ 0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MW 3x2 zestaw 50 szt. / N38
| Surface type | Friction coefficient / % | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% of nominal force
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| Painted steel (standard) |
µ = 0.2
20% of nominal force
|
0.06 kg / 0.13 LBS
60.0 g / 0.6 N
|
| Oily/slippery steel |
µ = 0.1
10% of nominal force
|
0.03 kg / 0.07 LBS
30.0 g / 0.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% of nominal force
|
0.15 kg / 0.33 LBS
150.0 g / 1.5 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 3x2 zestaw 50 szt. / 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: Thermal stability (stability) - power drop
MW 3x2 zestaw 50 szt. / N38
| Magnet temperature (°C) | Force change relative to 20°C | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
Estimate |
| 40 °C | -4.4% |
0.29 kg / 0.63 LBS
286.9 g / 2.8 N
|
Estimate |
| 60 °C | -8.6% |
0.27 kg / 0.60 LBS
274.2 g / 2.7 N
|
Estimate |
| 80 °C | -12.8% |
0.26 kg / 0.58 LBS
261.7 g / 2.6 N
|
Material limit |
| 100 °C | — | — | Out of range — no model |
Table 6: Two magnets (repulsion) - field range
MW 3x2 zestaw 50 szt. / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral 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: Axial field levels — not safety zones
MW 3x2 zestaw 50 szt. / N38
| Field level (Gs) | mT | Model distance (cm) |
|---|---|---|
| < 5 Gs | < 0.5 mT | 2.0 cm |
| < 10 Gs | < 1.0 mT | 1.5 cm |
| < 20 Gs | < 2.0 mT | 1.5 cm |
| < 40 Gs | < 4.0 mT | 1.0 cm |
| < 50 Gs | < 5.0 mT | 1.0 cm |
| < 400 Gs | < 40.0 mT | 0.5 cm |
| < 600 Gs | < 60.0 mT | 0.5 cm |
Table 8: Collisions (cracking risk) - warning
MW 3x2 zestaw 50 szt. / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
2.92 km/h
(0.81 m/s)
|
0.00 J | |
| 30 mm |
2.92 km/h
(0.81 m/s)
|
0.00 J | |
| 50 mm |
2.92 km/h
(0.81 m/s)
|
0.00 J | |
| 100 mm |
2.92 km/h
(0.81 m/s)
|
0.00 J |
Table 9: Anti-corrosion coating durability
MW 3x2 zestaw 50 szt. / 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 3x2 zestaw 50 szt. / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 353 Mx | 3.5 µWb |
| Pc Coefficient | 0.71 | High (Stable) |
Table 11: Physics of underwater searching
MW 3x2 zestaw 50 szt. / 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 ~20% of its max power.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.
3. Heat tolerance
N38: the maximum material working temperature is 80°C. Permitted conditions also depend on the shape and magnetic circuit.
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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Advantages as well as disadvantages of Nd2Fe14B magnets.
Benefits
- They do not lose power, even over nearly ten years – the drop in power is only ~1% (according to tests),
- They do not lose their magnetic properties even under external field action,
- In other words, due to the aesthetic finish of nickel, the element gains a professional look,
- Neodymium magnets achieve maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- 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...
- Thanks to flexibility in forming and the ability to modify to specific needs,
- Fundamental importance in innovative solutions – they are commonly used in hard drives, electromotive mechanisms, medical devices, also technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in small systems
Cons
- At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- Do not exceed this material temperature limit: 80°C. Overheating may permanently weaken the magnet.
- They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- We suggest casing - magnetic holder, due to difficulties in creating threads inside the magnet and complex shapes.
- Possible danger resulting from small fragments 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 small components of these devices can complicate diagnosis medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Maximum lifting force for a neodymium magnet – what affects it?
- using a base made of low-carbon steel, functioning as a magnetic yoke
- possessing a thickness of minimum 10 mm to avoid saturation
- with an ideally smooth touching surface
- with total lack of distance (without impurities)
- during detachment in a direction vertical to the plane
- at temperature approx. 20 degrees Celsius
Magnet lifting force in use – key factors
- Clearance – existence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Steel type – mild steel attracts best. Alloy admixtures decrease magnetic properties and holding force.
- Surface quality – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
- Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.
Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet and the plate reduces the lifting capacity.
Warnings
Medical implants
Warning for patients: Strong magnetic fields disrupt electronics. Maintain at least 30 cm distance or request help to work with the magnets.
GPS and phone interference
Note: rare earth magnets produce a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.
Keep away from computers
Data protection: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).
Fragile material
Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets leads to them cracking into small pieces.
Warning for allergy sufferers
Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease working with magnets and use protective gear.
Respect the power
Exercise caution. Neodymium magnets attract from a distance and connect with massive power, often quicker than you can move away.
Bone fractures
Danger of trauma: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.
Flammability
Powder produced during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.
Permanent damage
Do not exceed the maximum operating temperature stated in the specifications of the particular product. The limit depends on the material, geometry and operating arrangement; there is no single threshold for all neodymium magnets. Overheating can permanently weaken a magnet.
No play value
Absolutely keep magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are life-threatening.
