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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Physical properties - 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 magnet - report
Presented data are the result of a mathematical calculation. Results were calculated on models for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Please consider these calculations as a reference point during assembly planning.
Table 1: Static pull force (pull vs gap) - power drop
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
|
crushing |
| 1 mm |
2678 Gs
267.8 mT
|
25.89 kg / 57.08 lbs
25889.6 g / 254.0 N
|
crushing |
| 2 mm |
2573 Gs
257.3 mT
|
23.89 kg / 52.68 lbs
23893.3 g / 234.4 N
|
crushing |
| 3 mm |
2459 Gs
245.9 mT
|
21.83 kg / 48.12 lbs
21827.6 g / 214.1 N
|
crushing |
| 5 mm |
2216 Gs
221.6 mT
|
17.73 kg / 39.08 lbs
17728.1 g / 173.9 N
|
crushing |
| 10 mm |
1611 Gs
161.1 mT
|
9.37 kg / 20.66 lbs
9371.0 g / 91.9 N
|
strong |
| 15 mm |
1121 Gs
112.1 mT
|
4.54 kg / 10.01 lbs
4538.6 g / 44.5 N
|
strong |
| 20 mm |
775 Gs
77.5 mT
|
2.17 kg / 4.77 lbs
2165.8 g / 21.2 N
|
strong |
| 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: Vertical capacity (vertical surface)
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: Vertical assembly (sliding) - 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 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: Material efficiency (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 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 (material behavior) - resistance threshold
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 (attraction) - field range
MW 40x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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: Safety (HSE) (implants) - precautionary measures
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 |
| Mobile device | 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 (cracking risk) - 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: 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 (Pc)
MW 40x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 38 700 Mx | 387.0 µWb |
| Pc Coefficient | 0.35 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
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 wall, the magnet retains just approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Power loss vs temp
*For N38 material, the safety limit 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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View also proposals
Strengths as well as weaknesses of Nd2Fe14B magnets.
Benefits
- Their power is durable, and after approximately 10 years it decreases only by ~1% (according to research),
- Magnets effectively resist against loss of magnetization caused by ambient magnetic noise,
- Thanks to the smooth finish, the surface of nickel, gold-plated, or silver gives an visually attractive appearance,
- Neodymium magnets create maximum magnetic induction on a small area, which allows for strong attraction,
- 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...
- Possibility of accurate forming and adjusting to defined applications,
- Wide application in high-tech industry – they are used in hard drives, electric drive systems, diagnostic systems, as well as other advanced devices.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Weaknesses
- At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets lose their power 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 stability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Due to limitations in creating threads and complex forms in magnets, we recommend using a housing - magnetic holder.
- Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
- With large orders the cost of neodymium magnets is economically unviable,
Lifting parameters
Best holding force of the magnet in ideal parameters – what affects it?
- with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
- with a thickness of at least 10 mm
- characterized by lack of roughness
- without the slightest insulating layer between the magnet and steel
- under vertical application of breakaway force (90-degree angle)
- at ambient temperature approx. 20 degrees Celsius
Practical lifting capacity: influencing factors
- Distance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
- Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
- Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
- Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).
Lifting capacity was determined using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.
Precautions when working with neodymium magnets
Electronic hazard
Do not bring magnets close to a purse, computer, or screen. The magnetism can destroy these devices and erase data from cards.
Magnetic interference
GPS units and smartphones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can decalibrate the internal compass in your phone.
Product not for children
Strictly keep magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are life-threatening.
Conscious usage
Before starting, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.
Nickel allergy
It is widely known that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent direct skin contact or select encased magnets.
Life threat
Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.
Physical harm
Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!
Eye protection
Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Thermal limits
Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.
Fire warning
Dust produced during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.
