MW 25x6 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010050
GTIN/EAN: 5906301810490
Diameter Ø
25 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
22.09 g
Magnetization Direction
↑ axial
Load capacity
10.27 kg / 100.71 N
Magnetic Induction
268.21 mT / 2682 Gs
Coating
[NiCuNi] Nickel
7.40 ZŁ with VAT / pcs + price for transport
6.02 ZŁ net + 23% VAT / pcs
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Technical of the product - MW 25x6 / N38 - cylindrical magnet
Specification / characteristics - MW 25x6 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010050 |
| GTIN/EAN | 5906301810490 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 25 mm [±0,1 mm] |
| Height | 6 mm [±0,1 mm] |
| Weight | 22.09 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 10.27 kg / 100.71 N |
| Magnetic Induction ~ ? | 268.21 mT / 2682 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 modeling of the magnet - report
Presented values represent the direct effect of a physical calculation. Values are based on algorithms for the class Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Treat these data as a reference point for designers.
Table 1: Static force (pull vs gap) - power drop
MW 25x6 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2682 Gs
268.2 mT
|
10.27 kg / 22.64 pounds
10270.0 g / 100.7 N
|
crushing |
| 1 mm |
2535 Gs
253.5 mT
|
9.18 kg / 20.23 pounds
9177.2 g / 90.0 N
|
medium risk |
| 2 mm |
2363 Gs
236.3 mT
|
7.97 kg / 17.57 pounds
7971.8 g / 78.2 N
|
medium risk |
| 3 mm |
2176 Gs
217.6 mT
|
6.76 kg / 14.91 pounds
6761.0 g / 66.3 N
|
medium risk |
| 5 mm |
1793 Gs
179.3 mT
|
4.59 kg / 10.13 pounds
4592.7 g / 45.1 N
|
medium risk |
| 10 mm |
1013 Gs
101.3 mT
|
1.46 kg / 3.23 pounds
1464.5 g / 14.4 N
|
weak grip |
| 15 mm |
565 Gs
56.5 mT
|
0.46 kg / 1.00 pounds
455.3 g / 4.5 N
|
weak grip |
| 20 mm |
330 Gs
33.0 mT
|
0.16 kg / 0.34 pounds
155.7 g / 1.5 N
|
weak grip |
| 30 mm |
134 Gs
13.4 mT
|
0.03 kg / 0.06 pounds
25.6 g / 0.3 N
|
weak grip |
| 50 mm |
36 Gs
3.6 mT
|
0.00 kg / 0.00 pounds
1.9 g / 0.0 N
|
weak grip |
Table 2: Shear load (vertical surface)
MW 25x6 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.05 kg / 4.53 pounds
2054.0 g / 20.1 N
|
| 1 mm | Stal (~0.2) |
1.84 kg / 4.05 pounds
1836.0 g / 18.0 N
|
| 2 mm | Stal (~0.2) |
1.59 kg / 3.51 pounds
1594.0 g / 15.6 N
|
| 3 mm | Stal (~0.2) |
1.35 kg / 2.98 pounds
1352.0 g / 13.3 N
|
| 5 mm | Stal (~0.2) |
0.92 kg / 2.02 pounds
918.0 g / 9.0 N
|
| 10 mm | Stal (~0.2) |
0.29 kg / 0.64 pounds
292.0 g / 2.9 N
|
| 15 mm | Stal (~0.2) |
0.09 kg / 0.20 pounds
92.0 g / 0.9 N
|
| 20 mm | Stal (~0.2) |
0.03 kg / 0.07 pounds
32.0 g / 0.3 N
|
| 30 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MW 25x6 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
3.08 kg / 6.79 pounds
3081.0 g / 30.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.05 kg / 4.53 pounds
2054.0 g / 20.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.03 kg / 2.26 pounds
1027.0 g / 10.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
5.14 kg / 11.32 pounds
5135.0 g / 50.4 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MW 25x6 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.51 kg / 1.13 pounds
513.5 g / 5.0 N
|
| 1 mm |
|
1.28 kg / 2.83 pounds
1283.8 g / 12.6 N
|
| 2 mm |
|
2.57 kg / 5.66 pounds
2567.5 g / 25.2 N
|
| 3 mm |
|
3.85 kg / 8.49 pounds
3851.3 g / 37.8 N
|
| 5 mm |
|
6.42 kg / 14.15 pounds
6418.7 g / 63.0 N
|
| 10 mm |
|
10.27 kg / 22.64 pounds
10270.0 g / 100.7 N
|
| 11 mm |
|
10.27 kg / 22.64 pounds
10270.0 g / 100.7 N
|
| 12 mm |
|
10.27 kg / 22.64 pounds
10270.0 g / 100.7 N
|
Table 5: Thermal stability (material behavior) - power drop
MW 25x6 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
10.27 kg / 22.64 pounds
10270.0 g / 100.7 N
|
OK |
| 40 °C | -2.2% |
10.04 kg / 22.14 pounds
10044.1 g / 98.5 N
|
OK |
| 60 °C | -4.4% |
9.82 kg / 21.65 pounds
9818.1 g / 96.3 N
|
|
| 80 °C | -6.6% |
9.59 kg / 21.15 pounds
9592.2 g / 94.1 N
|
|
| 100 °C | -28.8% |
7.31 kg / 16.12 pounds
7312.2 g / 71.7 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MW 25x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
21.76 kg / 47.98 pounds
4 291 Gs
|
3.26 kg / 7.20 pounds
3264 g / 32.0 N
|
N/A |
| 1 mm |
20.66 kg / 45.54 pounds
5 225 Gs
|
3.10 kg / 6.83 pounds
3098 g / 30.4 N
|
18.59 kg / 40.98 pounds
~0 Gs
|
| 2 mm |
19.45 kg / 42.87 pounds
5 070 Gs
|
2.92 kg / 6.43 pounds
2917 g / 28.6 N
|
17.50 kg / 38.58 pounds
~0 Gs
|
| 3 mm |
18.18 kg / 40.09 pounds
4 902 Gs
|
2.73 kg / 6.01 pounds
2727 g / 26.8 N
|
16.36 kg / 36.08 pounds
~0 Gs
|
| 5 mm |
15.60 kg / 34.39 pounds
4 541 Gs
|
2.34 kg / 5.16 pounds
2340 g / 23.0 N
|
14.04 kg / 30.95 pounds
~0 Gs
|
| 10 mm |
9.73 kg / 21.46 pounds
3 587 Gs
|
1.46 kg / 3.22 pounds
1460 g / 14.3 N
|
8.76 kg / 19.31 pounds
~0 Gs
|
| 20 mm |
3.10 kg / 6.84 pounds
2 025 Gs
|
0.47 kg / 1.03 pounds
465 g / 4.6 N
|
2.79 kg / 6.16 pounds
~0 Gs
|
| 50 mm |
0.13 kg / 0.28 pounds
409 Gs
|
0.02 kg / 0.04 pounds
19 g / 0.2 N
|
0.11 kg / 0.25 pounds
~0 Gs
|
| 60 mm |
0.05 kg / 0.12 pounds
268 Gs
|
0.01 kg / 0.02 pounds
8 g / 0.1 N
|
0.05 kg / 0.11 pounds
~0 Gs
|
| 70 mm |
0.03 kg / 0.06 pounds
183 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
| 80 mm |
0.01 kg / 0.03 pounds
131 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.03 pounds
~0 Gs
|
| 90 mm |
0.01 kg / 0.02 pounds
96 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.01 pounds
72 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MW 25x6 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 10.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 8.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 6.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 5.0 cm |
| Car key | 50 Gs (5.0 mT) | 4.5 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MW 25x6 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
23.60 km/h
(6.56 m/s)
|
0.47 J | |
| 30 mm |
37.72 km/h
(10.48 m/s)
|
1.21 J | |
| 50 mm |
48.63 km/h
(13.51 m/s)
|
2.02 J | |
| 100 mm |
68.77 km/h
(19.10 m/s)
|
4.03 J |
Table 9: Surface protection spec
MW 25x6 / 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 25x6 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 14 740 Mx | 147.4 µWb |
| Pc Coefficient | 0.34 | Low (Flat) |
Table 11: Submerged application
MW 25x6 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 10.27 kg | Standard |
| Water (riverbed) |
11.76 kg
(+1.49 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Caution: On a vertical wall, the magnet holds only ~20% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) severely reduces the holding force.
3. Thermal stability
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.34
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths and weaknesses of neodymium magnets.
Benefits
- They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
- They possess excellent resistance to magnetism drop when exposed to external magnetic sources,
- In other words, due to the shiny layer of nickel, the element gains visual value,
- Neodymium magnets generate maximum magnetic induction on a contact point, which increases force concentration,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to versatility in forming and the capacity to customize to complex applications,
- Significant place in innovative solutions – they are used in computer drives, electric motors, diagnostic systems, as well as modern systems.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in small systems
Disadvantages
- At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Limited possibility of producing nuts in the magnet and complex shapes - preferred is casing - mounting mechanism.
- Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these products are able to disrupt the diagnostic process medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Holding force characteristics
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- using a base made of mild steel, serving as a circuit closing element
- with a thickness of at least 10 mm
- characterized by lack of roughness
- with total lack of distance (without paint)
- for force applied at a right angle (in the magnet axis)
- at room temperature
Lifting capacity in practice – influencing factors
- Distance (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
- Direction of force – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
- Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
- Surface structure – the smoother and more polished the plate, 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 maximum operating temperature for a given model.
Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.
Safe handling of NdFeB magnets
Pinching danger
Large magnets can crush fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.
Sensitization to coating
Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, cease working with magnets and wear gloves.
Keep away from children
Absolutely keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are tragic.
Warning for heart patients
Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
Do not drill into magnets
Dust created during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Heat warning
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.
Do not underestimate power
Exercise caution. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can move away.
Eye protection
Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.
Threat to navigation
A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Do not bring magnets close to a device to avoid damaging the sensors.
Electronic devices
Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Keep a distance of min. 10 cm.
