MW 40x15 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010067
GTIN/EAN: 5906301810667
Diameter Ø
40 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
141.37 g
Magnetization Direction
↑ axial
Load capacity
42.64 kg / 418.33 N
Magnetic Induction
371.91 mT / 3719 Gs
Coating
[NiCuNi] Nickel
65.93 ZŁ with VAT / pcs + price for transport
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Detailed specification - MW 40x15 / N38 - cylindrical magnet
Specification / characteristics - MW 40x15 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010067 |
| GTIN/EAN | 5906301810667 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 40 mm [±0,1 mm] |
| Height | 15 mm [±0,1 mm] |
| Weight | 141.37 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 42.64 kg / 418.33 N |
| Magnetic Induction ~ ? | 371.91 mT / 3719 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 modeling of the assembly - technical parameters
The following values are the outcome of a physical simulation. Results rely on algorithms for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Treat these calculations as a supplementary guide for designers.
Table 1: Static force (force vs distance) - power drop
MW 40x15 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3718 Gs
371.8 mT
|
42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
|
dangerous! |
| 1 mm |
3563 Gs
356.3 mT
|
39.16 kg / 86.33 lbs
39159.5 g / 384.2 N
|
dangerous! |
| 2 mm |
3398 Gs
339.8 mT
|
35.62 kg / 78.52 lbs
35617.1 g / 349.4 N
|
dangerous! |
| 3 mm |
3228 Gs
322.8 mT
|
32.13 kg / 70.84 lbs
32130.5 g / 315.2 N
|
dangerous! |
| 5 mm |
2880 Gs
288.0 mT
|
25.58 kg / 56.40 lbs
25584.2 g / 251.0 N
|
dangerous! |
| 10 mm |
2069 Gs
206.9 mT
|
13.20 kg / 29.09 lbs
13196.7 g / 129.5 N
|
dangerous! |
| 15 mm |
1439 Gs
143.9 mT
|
6.38 kg / 14.07 lbs
6383.1 g / 62.6 N
|
strong |
| 20 mm |
999 Gs
99.9 mT
|
3.08 kg / 6.79 lbs
3077.9 g / 30.2 N
|
strong |
| 30 mm |
507 Gs
50.7 mT
|
0.79 kg / 1.75 lbs
792.4 g / 7.8 N
|
safe |
| 50 mm |
169 Gs
16.9 mT
|
0.09 kg / 0.19 lbs
88.4 g / 0.9 N
|
safe |
Table 2: Shear capacity (vertical surface)
MW 40x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
8.53 kg / 18.80 lbs
8528.0 g / 83.7 N
|
| 1 mm | Stal (~0.2) |
7.83 kg / 17.27 lbs
7832.0 g / 76.8 N
|
| 2 mm | Stal (~0.2) |
7.12 kg / 15.71 lbs
7124.0 g / 69.9 N
|
| 3 mm | Stal (~0.2) |
6.43 kg / 14.17 lbs
6426.0 g / 63.0 N
|
| 5 mm | Stal (~0.2) |
5.12 kg / 11.28 lbs
5116.0 g / 50.2 N
|
| 10 mm | Stal (~0.2) |
2.64 kg / 5.82 lbs
2640.0 g / 25.9 N
|
| 15 mm | Stal (~0.2) |
1.28 kg / 2.81 lbs
1276.0 g / 12.5 N
|
| 20 mm | Stal (~0.2) |
0.62 kg / 1.36 lbs
616.0 g / 6.0 N
|
| 30 mm | Stal (~0.2) |
0.16 kg / 0.35 lbs
158.0 g / 1.5 N
|
| 50 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
18.0 g / 0.2 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MW 40x15 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
12.79 kg / 28.20 lbs
12792.0 g / 125.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
8.53 kg / 18.80 lbs
8528.0 g / 83.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.26 kg / 9.40 lbs
4264.0 g / 41.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
21.32 kg / 47.00 lbs
21320.0 g / 209.1 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 40x15 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.13 kg / 4.70 lbs
2132.0 g / 20.9 N
|
| 1 mm |
|
5.33 kg / 11.75 lbs
5330.0 g / 52.3 N
|
| 2 mm |
|
10.66 kg / 23.50 lbs
10660.0 g / 104.6 N
|
| 3 mm |
|
15.99 kg / 35.25 lbs
15990.0 g / 156.9 N
|
| 5 mm |
|
26.65 kg / 58.75 lbs
26650.0 g / 261.4 N
|
| 10 mm |
|
42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
|
| 11 mm |
|
42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
|
| 12 mm |
|
42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
|
Table 5: Working in heat (stability) - power drop
MW 40x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
|
OK |
| 40 °C | -2.2% |
41.70 kg / 91.94 lbs
41701.9 g / 409.1 N
|
OK |
| 60 °C | -4.4% |
40.76 kg / 89.87 lbs
40763.8 g / 399.9 N
|
|
| 80 °C | -6.6% |
39.83 kg / 87.80 lbs
39825.8 g / 390.7 N
|
|
| 100 °C | -28.8% |
30.36 kg / 66.93 lbs
30359.7 g / 297.8 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 40x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
107.12 kg / 236.16 lbs
5 156 Gs
|
16.07 kg / 35.42 lbs
16068 g / 157.6 N
|
N/A |
| 1 mm |
102.82 kg / 226.67 lbs
7 286 Gs
|
15.42 kg / 34.00 lbs
15422 g / 151.3 N
|
92.53 kg / 204.00 lbs
~0 Gs
|
| 2 mm |
98.38 kg / 216.89 lbs
7 127 Gs
|
14.76 kg / 32.53 lbs
14757 g / 144.8 N
|
88.54 kg / 195.20 lbs
~0 Gs
|
| 3 mm |
93.92 kg / 207.06 lbs
6 964 Gs
|
14.09 kg / 31.06 lbs
14088 g / 138.2 N
|
84.53 kg / 186.36 lbs
~0 Gs
|
| 5 mm |
85.07 kg / 187.55 lbs
6 627 Gs
|
12.76 kg / 28.13 lbs
12760 g / 125.2 N
|
76.56 kg / 168.79 lbs
~0 Gs
|
| 10 mm |
64.27 kg / 141.70 lbs
5 761 Gs
|
9.64 kg / 21.25 lbs
9641 g / 94.6 N
|
57.85 kg / 127.53 lbs
~0 Gs
|
| 20 mm |
33.15 kg / 73.09 lbs
4 137 Gs
|
4.97 kg / 10.96 lbs
4973 g / 48.8 N
|
29.84 kg / 65.78 lbs
~0 Gs
|
| 50 mm |
3.84 kg / 8.47 lbs
1 408 Gs
|
0.58 kg / 1.27 lbs
576 g / 5.7 N
|
3.46 kg / 7.62 lbs
~0 Gs
|
| 60 mm |
1.99 kg / 4.39 lbs
1 014 Gs
|
0.30 kg / 0.66 lbs
299 g / 2.9 N
|
1.79 kg / 3.95 lbs
~0 Gs
|
| 70 mm |
1.08 kg / 2.38 lbs
747 Gs
|
0.16 kg / 0.36 lbs
162 g / 1.6 N
|
0.97 kg / 2.14 lbs
~0 Gs
|
| 80 mm |
0.61 kg / 1.35 lbs
563 Gs
|
0.09 kg / 0.20 lbs
92 g / 0.9 N
|
0.55 kg / 1.22 lbs
~0 Gs
|
| 90 mm |
0.36 kg / 0.80 lbs
432 Gs
|
0.05 kg / 0.12 lbs
54 g / 0.5 N
|
0.33 kg / 0.72 lbs
~0 Gs
|
| 100 mm |
0.22 kg / 0.49 lbs
339 Gs
|
0.03 kg / 0.07 lbs
33 g / 0.3 N
|
0.20 kg / 0.44 lbs
~0 Gs
|
Table 7: Hazards (implants) - warnings
MW 40x15 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 19.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 15.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 11.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 9.0 cm |
| Remote | 50 Gs (5.0 mT) | 8.5 cm |
| Payment card | 400 Gs (40.0 mT) | 3.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Dynamics (cracking risk) - warning
MW 40x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.63 km/h
(5.73 m/s)
|
2.32 J | |
| 30 mm |
30.69 km/h
(8.52 m/s)
|
5.14 J | |
| 50 mm |
39.22 km/h
(10.89 m/s)
|
8.39 J | |
| 100 mm |
55.39 km/h
(15.39 m/s)
|
16.73 J |
Table 9: Corrosion resistance
MW 40x15 / 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 40x15 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 48 650 Mx | 486.5 µWb |
| Pc Coefficient | 0.48 | Low (Flat) |
Table 11: Submerged application
MW 40x15 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 42.64 kg | Standard |
| Water (riverbed) |
48.82 kg
(+6.18 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical surface, the magnet retains only a fraction of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely reduces the holding force.
3. Temperature resistance
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48
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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Strengths as well as weaknesses of rare earth magnets.
Strengths
- They do not lose power, even during nearly 10 years – the drop in lifting capacity is only ~1% (theoretically),
- Magnets perfectly resist against loss of magnetization caused by ambient magnetic noise,
- The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to look better,
- They feature high magnetic induction at the operating surface, which affects their effectiveness,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to versatility in constructing and the ability to customize to complex applications,
- Significant place in future technologies – they find application in computer drives, drive modules, diagnostic systems, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in small systems
Limitations
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
- 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 durability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
- We recommend casing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
- Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products can complicate diagnosis medical after entering the body.
- With large orders the cost of neodymium magnets is a challenge,
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- with the application of a yoke made of special test steel, ensuring full magnetic saturation
- possessing a massiveness of min. 10 mm to ensure full flux closure
- characterized by smoothness
- without the slightest air gap between the magnet and steel
- during detachment in a direction vertical to the plane
- at room temperature
Practical lifting capacity: influencing factors
- Distance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Plate thickness – too thin steel does not close the flux, causing part of the power to be wasted into the air.
- Chemical composition of the base – mild steel gives the best results. Higher carbon content lower magnetic properties and holding force.
- Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
- Temperature – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.
Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.
Precautions when working with neodymium magnets
Fire risk
Mechanical processing of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Bone fractures
Danger of trauma: The attraction force is so immense that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.
Magnetic media
Data protection: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, timepieces).
Implant safety
Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.
Allergic reactions
Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, immediately stop working with magnets and use protective gear.
GPS Danger
GPS units and mobile phones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.
This is not a toy
Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are tragic.
Immense force
Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.
Do not overheat magnets
Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its properties and strength.
Risk of cracking
Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.
