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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Product card - 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 |
Technical simulation of the assembly - data
The following data constitute the outcome of a mathematical calculation. Values were calculated on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Please consider these calculations as a reference point during assembly planning.
Table 1: Static pull force (pull vs distance) - interaction chart
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 LBS
27730.0 g / 272.0 N
|
critical level |
| 1 mm |
2678 Gs
267.8 mT
|
25.89 kg / 57.08 LBS
25889.6 g / 254.0 N
|
critical level |
| 2 mm |
2573 Gs
257.3 mT
|
23.89 kg / 52.68 LBS
23893.3 g / 234.4 N
|
critical level |
| 3 mm |
2459 Gs
245.9 mT
|
21.83 kg / 48.12 LBS
21827.6 g / 214.1 N
|
critical level |
| 5 mm |
2216 Gs
221.6 mT
|
17.73 kg / 39.08 LBS
17728.1 g / 173.9 N
|
critical level |
| 10 mm |
1611 Gs
161.1 mT
|
9.37 kg / 20.66 LBS
9371.0 g / 91.9 N
|
medium risk |
| 15 mm |
1121 Gs
112.1 mT
|
4.54 kg / 10.01 LBS
4538.6 g / 44.5 N
|
medium risk |
| 20 mm |
775 Gs
77.5 mT
|
2.17 kg / 4.77 LBS
2165.8 g / 21.2 N
|
medium risk |
| 30 mm |
387 Gs
38.7 mT
|
0.54 kg / 1.19 LBS
539.8 g / 5.3 N
|
low risk |
| 50 mm |
125 Gs
12.5 mT
|
0.06 kg / 0.12 LBS
56.6 g / 0.6 N
|
low risk |
Table 2: Slippage force (wall)
MW 40x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
5.55 kg / 12.23 LBS
5546.0 g / 54.4 N
|
| 1 mm | Stal (~0.2) |
5.18 kg / 11.42 LBS
5178.0 g / 50.8 N
|
| 2 mm | Stal (~0.2) |
4.78 kg / 10.53 LBS
4778.0 g / 46.9 N
|
| 3 mm | Stal (~0.2) |
4.37 kg / 9.63 LBS
4366.0 g / 42.8 N
|
| 5 mm | Stal (~0.2) |
3.55 kg / 7.82 LBS
3546.0 g / 34.8 N
|
| 10 mm | Stal (~0.2) |
1.87 kg / 4.13 LBS
1874.0 g / 18.4 N
|
| 15 mm | Stal (~0.2) |
0.91 kg / 2.00 LBS
908.0 g / 8.9 N
|
| 20 mm | Stal (~0.2) |
0.43 kg / 0.96 LBS
434.0 g / 4.3 N
|
| 30 mm | Stal (~0.2) |
0.11 kg / 0.24 LBS
108.0 g / 1.1 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.03 LBS
12.0 g / 0.1 N
|
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 LBS
8319.0 g / 81.6 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
5.55 kg / 12.23 LBS
5546.0 g / 54.4 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.77 kg / 6.11 LBS
2773.0 g / 27.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
13.87 kg / 30.57 LBS
13865.0 g / 136.0 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 40x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.39 kg / 3.06 LBS
1386.5 g / 13.6 N
|
| 1 mm |
|
3.47 kg / 7.64 LBS
3466.3 g / 34.0 N
|
| 2 mm |
|
6.93 kg / 15.28 LBS
6932.5 g / 68.0 N
|
| 3 mm |
|
10.40 kg / 22.93 LBS
10398.8 g / 102.0 N
|
| 5 mm |
|
17.33 kg / 38.21 LBS
17331.3 g / 170.0 N
|
| 10 mm |
|
27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
|
| 11 mm |
|
27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
|
| 12 mm |
|
27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
|
Table 5: Thermal stability (stability) - thermal limit
MW 40x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
|
OK |
| 40 °C | -2.2% |
27.12 kg / 59.79 LBS
27119.9 g / 266.0 N
|
OK |
| 60 °C | -4.4% |
26.51 kg / 58.44 LBS
26509.9 g / 260.1 N
|
|
| 80 °C | -6.6% |
25.90 kg / 57.10 LBS
25899.8 g / 254.1 N
|
|
| 100 °C | -28.8% |
19.74 kg / 43.53 LBS
19743.8 g / 193.7 N
|
Table 6: Two magnets (repulsion) - field range
MW 40x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
59.52 kg / 131.22 LBS
4 382 Gs
|
8.93 kg / 19.68 LBS
8928 g / 87.6 N
|
N/A |
| 1 mm |
57.61 kg / 127.01 LBS
5 454 Gs
|
8.64 kg / 19.05 LBS
8642 g / 84.8 N
|
51.85 kg / 114.31 LBS
~0 Gs
|
| 2 mm |
55.57 kg / 122.52 LBS
5 357 Gs
|
8.34 kg / 18.38 LBS
8336 g / 81.8 N
|
50.01 kg / 110.26 LBS
~0 Gs
|
| 3 mm |
53.46 kg / 117.85 LBS
5 254 Gs
|
8.02 kg / 17.68 LBS
8019 g / 78.7 N
|
48.11 kg / 106.07 LBS
~0 Gs
|
| 5 mm |
49.08 kg / 108.20 LBS
5 034 Gs
|
7.36 kg / 16.23 LBS
7362 g / 72.2 N
|
44.17 kg / 97.38 LBS
~0 Gs
|
| 10 mm |
38.05 kg / 83.89 LBS
4 433 Gs
|
5.71 kg / 12.58 LBS
5708 g / 56.0 N
|
34.25 kg / 75.50 LBS
~0 Gs
|
| 20 mm |
20.11 kg / 44.35 LBS
3 223 Gs
|
3.02 kg / 6.65 LBS
3017 g / 29.6 N
|
18.10 kg / 39.91 LBS
~0 Gs
|
| 50 mm |
2.27 kg / 5.01 LBS
1 083 Gs
|
0.34 kg / 0.75 LBS
341 g / 3.3 N
|
2.05 kg / 4.51 LBS
~0 Gs
|
| 60 mm |
1.16 kg / 2.55 LBS
773 Gs
|
0.17 kg / 0.38 LBS
174 g / 1.7 N
|
1.04 kg / 2.30 LBS
~0 Gs
|
| 70 mm |
0.62 kg / 1.36 LBS
565 Gs
|
0.09 kg / 0.20 LBS
93 g / 0.9 N
|
0.56 kg / 1.23 LBS
~0 Gs
|
| 80 mm |
0.35 kg / 0.76 LBS
422 Gs
|
0.05 kg / 0.11 LBS
52 g / 0.5 N
|
0.31 kg / 0.69 LBS
~0 Gs
|
| 90 mm |
0.20 kg / 0.44 LBS
322 Gs
|
0.03 kg / 0.07 LBS
30 g / 0.3 N
|
0.18 kg / 0.40 LBS
~0 Gs
|
| 100 mm |
0.12 kg / 0.27 LBS
251 Gs
|
0.02 kg / 0.04 LBS
18 g / 0.2 N
|
0.11 kg / 0.24 LBS
~0 Gs
|
Table 7: Protective zones (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 |
| Car key | 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) - collision effects
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: Anti-corrosion coating durability
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: Electrical 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: Submerged application
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. Wall mount (shear)
*Note: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.
2. Steel thickness impact
*Thin steel (e.g. computer case) severely reduces the holding force.
3. Heat tolerance
*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) = 0.35
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% |
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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Pros as well as cons of neodymium magnets.
Pros
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
- Neodymium magnets are characterized by remarkably resistant to demagnetization caused by magnetic disturbances,
- A magnet with a metallic silver surface is more attractive,
- Magnetic induction on the surface of the magnet turns out to be maximum,
- 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 option of free molding and adaptation to unique projects, neodymium magnets can be manufactured in a variety of shapes and sizes, which increases their versatility,
- Significant place in modern technologies – they find application in magnetic memories, drive modules, medical devices, also other advanced devices.
- Thanks to their power density, small magnets offer high operating force, with minimal size,
Weaknesses
- At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and 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 stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in creating threads and complicated forms in magnets, we recommend using cover - magnetic mechanism.
- Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these devices 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
Maximum holding power of the magnet – what affects it?
- with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
- with a thickness minimum 10 mm
- with an polished contact surface
- with direct contact (no paint)
- under axial force direction (90-degree angle)
- at temperature room level
Lifting capacity in practice – influencing factors
- Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Angle of force application – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Metal type – different alloys reacts the same. High carbon content worsen the attraction effect.
- Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate reduces the holding force.
Safe handling of NdFeB magnets
No play value
Absolutely keep magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are very dangerous.
Combustion hazard
Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
Magnetic interference
A powerful magnetic field negatively affects the operation of compasses in phones and navigation systems. Do not bring magnets near a device to avoid breaking the sensors.
Do not overheat magnets
Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.
Crushing force
Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand betwixt two attracting surfaces.
Metal Allergy
Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness appears, cease working with magnets and use protective gear.
Handling rules
Exercise caution. Rare earth magnets attract from a long distance and connect with massive power, often quicker than you can move away.
Data carriers
Avoid bringing magnets near a wallet, computer, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.
Protective goggles
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Implant safety
Life threat: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.
