MW 40x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010066
GTIN/EAN: 5906301810650
Diameter Ø
40 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
94.25 g
Magnetization Direction
↑ axial
Load capacity
27.73 kg / 271.99 N
Magnetic Induction
277.22 mT / 2772 Gs
Coating
[NiCuNi] Nickel
36.57 ZŁ with VAT / pcs + price for transport
29.73 ZŁ net + 23% VAT / pcs
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Technical - MW 40x10 / N38 - cylindrical magnet
Specification / characteristics - MW 40x10 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010066 |
| GTIN/EAN | 5906301810650 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 40 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 94.25 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 27.73 kg / 271.99 N |
| Magnetic Induction ~ ? | 277.22 mT / 2772 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 analysis of the assembly - report
The following values constitute the outcome of a engineering analysis. Values were calculated on models for the class Nd2Fe14B. Real-world performance may differ. Use these calculations as a supplementary guide when designing systems.
Table 1: Static pull force (pull vs distance) - characteristics
MW 40x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2772 Gs
277.2 mT
|
27.73 kg / 61.13 pounds
27730.0 g / 272.0 N
|
crushing |
| 1 mm |
2678 Gs
267.8 mT
|
25.89 kg / 57.08 pounds
25889.6 g / 254.0 N
|
crushing |
| 2 mm |
2573 Gs
257.3 mT
|
23.89 kg / 52.68 pounds
23893.3 g / 234.4 N
|
crushing |
| 3 mm |
2459 Gs
245.9 mT
|
21.83 kg / 48.12 pounds
21827.6 g / 214.1 N
|
crushing |
| 5 mm |
2216 Gs
221.6 mT
|
17.73 kg / 39.08 pounds
17728.1 g / 173.9 N
|
crushing |
| 10 mm |
1611 Gs
161.1 mT
|
9.37 kg / 20.66 pounds
9371.0 g / 91.9 N
|
medium risk |
| 15 mm |
1121 Gs
112.1 mT
|
4.54 kg / 10.01 pounds
4538.6 g / 44.5 N
|
medium risk |
| 20 mm |
775 Gs
77.5 mT
|
2.17 kg / 4.77 pounds
2165.8 g / 21.2 N
|
medium risk |
| 30 mm |
387 Gs
38.7 mT
|
0.54 kg / 1.19 pounds
539.8 g / 5.3 N
|
safe |
| 50 mm |
125 Gs
12.5 mT
|
0.06 kg / 0.12 pounds
56.6 g / 0.6 N
|
safe |
Table 2: Vertical capacity (wall)
MW 40x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
5.55 kg / 12.23 pounds
5546.0 g / 54.4 N
|
| 1 mm | Stal (~0.2) |
5.18 kg / 11.42 pounds
5178.0 g / 50.8 N
|
| 2 mm | Stal (~0.2) |
4.78 kg / 10.53 pounds
4778.0 g / 46.9 N
|
| 3 mm | Stal (~0.2) |
4.37 kg / 9.63 pounds
4366.0 g / 42.8 N
|
| 5 mm | Stal (~0.2) |
3.55 kg / 7.82 pounds
3546.0 g / 34.8 N
|
| 10 mm | Stal (~0.2) |
1.87 kg / 4.13 pounds
1874.0 g / 18.4 N
|
| 15 mm | Stal (~0.2) |
0.91 kg / 2.00 pounds
908.0 g / 8.9 N
|
| 20 mm | Stal (~0.2) |
0.43 kg / 0.96 pounds
434.0 g / 4.3 N
|
| 30 mm | Stal (~0.2) |
0.11 kg / 0.24 pounds
108.0 g / 1.1 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
12.0 g / 0.1 N
|
Table 3: Wall mounting (shearing) - vertical pull
MW 40x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
8.32 kg / 18.34 pounds
8319.0 g / 81.6 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
5.55 kg / 12.23 pounds
5546.0 g / 54.4 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.77 kg / 6.11 pounds
2773.0 g / 27.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
13.87 kg / 30.57 pounds
13865.0 g / 136.0 N
|
Table 4: Steel thickness (saturation) - power losses
MW 40x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.39 kg / 3.06 pounds
1386.5 g / 13.6 N
|
| 1 mm |
|
3.47 kg / 7.64 pounds
3466.3 g / 34.0 N
|
| 2 mm |
|
6.93 kg / 15.28 pounds
6932.5 g / 68.0 N
|
| 3 mm |
|
10.40 kg / 22.93 pounds
10398.8 g / 102.0 N
|
| 5 mm |
|
17.33 kg / 38.21 pounds
17331.3 g / 170.0 N
|
| 10 mm |
|
27.73 kg / 61.13 pounds
27730.0 g / 272.0 N
|
| 11 mm |
|
27.73 kg / 61.13 pounds
27730.0 g / 272.0 N
|
| 12 mm |
|
27.73 kg / 61.13 pounds
27730.0 g / 272.0 N
|
Table 5: Thermal stability (stability) - power drop
MW 40x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
27.73 kg / 61.13 pounds
27730.0 g / 272.0 N
|
OK |
| 40 °C | -2.2% |
27.12 kg / 59.79 pounds
27119.9 g / 266.0 N
|
OK |
| 60 °C | -4.4% |
26.51 kg / 58.44 pounds
26509.9 g / 260.1 N
|
|
| 80 °C | -6.6% |
25.90 kg / 57.10 pounds
25899.8 g / 254.1 N
|
|
| 100 °C | -28.8% |
19.74 kg / 43.53 pounds
19743.8 g / 193.7 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 40x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
59.52 kg / 131.22 pounds
4 382 Gs
|
8.93 kg / 19.68 pounds
8928 g / 87.6 N
|
N/A |
| 1 mm |
57.61 kg / 127.01 pounds
5 454 Gs
|
8.64 kg / 19.05 pounds
8642 g / 84.8 N
|
51.85 kg / 114.31 pounds
~0 Gs
|
| 2 mm |
55.57 kg / 122.52 pounds
5 357 Gs
|
8.34 kg / 18.38 pounds
8336 g / 81.8 N
|
50.01 kg / 110.26 pounds
~0 Gs
|
| 3 mm |
53.46 kg / 117.85 pounds
5 254 Gs
|
8.02 kg / 17.68 pounds
8019 g / 78.7 N
|
48.11 kg / 106.07 pounds
~0 Gs
|
| 5 mm |
49.08 kg / 108.20 pounds
5 034 Gs
|
7.36 kg / 16.23 pounds
7362 g / 72.2 N
|
44.17 kg / 97.38 pounds
~0 Gs
|
| 10 mm |
38.05 kg / 83.89 pounds
4 433 Gs
|
5.71 kg / 12.58 pounds
5708 g / 56.0 N
|
34.25 kg / 75.50 pounds
~0 Gs
|
| 20 mm |
20.11 kg / 44.35 pounds
3 223 Gs
|
3.02 kg / 6.65 pounds
3017 g / 29.6 N
|
18.10 kg / 39.91 pounds
~0 Gs
|
| 50 mm |
2.27 kg / 5.01 pounds
1 083 Gs
|
0.34 kg / 0.75 pounds
341 g / 3.3 N
|
2.05 kg / 4.51 pounds
~0 Gs
|
| 60 mm |
1.16 kg / 2.55 pounds
773 Gs
|
0.17 kg / 0.38 pounds
174 g / 1.7 N
|
1.04 kg / 2.30 pounds
~0 Gs
|
| 70 mm |
0.62 kg / 1.36 pounds
565 Gs
|
0.09 kg / 0.20 pounds
93 g / 0.9 N
|
0.56 kg / 1.23 pounds
~0 Gs
|
| 80 mm |
0.35 kg / 0.76 pounds
422 Gs
|
0.05 kg / 0.11 pounds
52 g / 0.5 N
|
0.31 kg / 0.69 pounds
~0 Gs
|
| 90 mm |
0.20 kg / 0.44 pounds
322 Gs
|
0.03 kg / 0.07 pounds
30 g / 0.3 N
|
0.18 kg / 0.40 pounds
~0 Gs
|
| 100 mm |
0.12 kg / 0.27 pounds
251 Gs
|
0.02 kg / 0.04 pounds
18 g / 0.2 N
|
0.11 kg / 0.24 pounds
~0 Gs
|
Table 7: Hazards (electronics) - warnings
MW 40x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 16.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 13.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 10.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 8.0 cm |
| Remote | 50 Gs (5.0 mT) | 7.5 cm |
| Payment card | 400 Gs (40.0 mT) | 3.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.5 cm |
Table 8: Impact energy (kinetic energy) - warning
MW 40x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.63 km/h
(5.73 m/s)
|
1.55 J | |
| 30 mm |
30.32 km/h
(8.42 m/s)
|
3.34 J | |
| 50 mm |
38.73 km/h
(10.76 m/s)
|
5.45 J | |
| 100 mm |
54.71 km/h
(15.20 m/s)
|
10.88 J |
Table 9: Corrosion resistance
MW 40x10 / 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 40x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 38 700 Mx | 387.0 µWb |
| Pc Coefficient | 0.35 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MW 40x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 27.73 kg | Standard |
| Water (riverbed) |
31.75 kg
(+4.02 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical surface, the magnet retains merely a fraction of its perpendicular strength.
2. Steel thickness impact
*Thin steel (e.g. computer case) significantly reduces the holding force.
3. Temperature resistance
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.35
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.
Elemental analysis
| 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 products
Strengths as well as weaknesses of Nd2Fe14B magnets.
Benefits
- They have unchanged lifting capacity, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
- They are extremely resistant to demagnetization induced by presence of other magnetic fields,
- A magnet with a shiny nickel surface is more attractive,
- Neodymium magnets create maximum magnetic induction on a small area, 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 form) at temperatures up to 230°C and above...
- In view of the potential of flexible molding and adaptation to individualized projects, NdFeB magnets can be created in a variety of geometric configurations, which amplifies use scope,
- Versatile presence in high-tech industry – they serve a role in data components, brushless drives, medical devices, and complex engineering applications.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 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 magnets in rubber or plastics, which secure oxidation and corrosion.
- We recommend casing - magnetic holder, due to difficulties in creating threads inside the magnet and complex forms.
- Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- using a plate made of high-permeability steel, functioning as a ideal flux conductor
- possessing a massiveness of at least 10 mm to ensure full flux closure
- with an polished touching surface
- without the slightest insulating layer between the magnet and steel
- under perpendicular force vector (90-degree angle)
- in stable room temperature
Magnet lifting force in use – key factors
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Steel type – low-carbon steel gives the best results. Alloy admixtures decrease magnetic permeability and lifting capacity.
- Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
- Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.
Warnings
Precision electronics
Note: neodymium magnets produce a field that interferes with precision electronics. Keep a safe distance from your phone, tablet, and navigation systems.
Caution required
Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.
Finger safety
Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!
Danger to the youngest
Only for adults. Tiny parts can be swallowed, causing intestinal necrosis. Store out of reach of children and animals.
Material brittleness
Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.
Life threat
Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.
Cards and drives
Avoid bringing magnets close to a purse, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.
Mechanical processing
Dust produced during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.
Sensitization to coating
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, immediately stop handling magnets and wear gloves.
Operating temperature
Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and pulling force.
