MW 38x12 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010060
GTIN/EAN: 5906301810599
Diameter Ø
38 mm [±0,1 mm]
Height
12 mm [±0,1 mm]
Weight
102.07 g
Magnetization Direction
↑ axial
Load capacity
32.79 kg / 321.71 N
Magnetic Induction
331.00 mT / 3310 Gs
Coating
[NiCuNi] Nickel
32.10 ZŁ with VAT / pcs + price for transport
26.10 ZŁ net + 23% VAT / pcs
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Technical of the product - MW 38x12 / N38 - cylindrical magnet
Specification / characteristics - MW 38x12 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010060 |
| GTIN/EAN | 5906301810599 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 38 mm [±0,1 mm] |
| Height | 12 mm [±0,1 mm] |
| Weight | 102.07 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 32.79 kg / 321.71 N |
| Magnetic Induction ~ ? | 331.00 mT / 3310 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 analysis of the product - technical parameters
Presented information represent the result of a engineering calculation. Results are based on algorithms for the class Nd2Fe14B. Operational performance may deviate from the simulation results. Please consider these calculations as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs gap) - characteristics
MW 38x12 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3309 Gs
330.9 mT
|
32.79 kg / 72.29 lbs
32790.0 g / 321.7 N
|
critical level |
| 1 mm |
3175 Gs
317.5 mT
|
30.18 kg / 66.54 lbs
30182.9 g / 296.1 N
|
critical level |
| 2 mm |
3029 Gs
302.9 mT
|
27.46 kg / 60.55 lbs
27464.0 g / 269.4 N
|
critical level |
| 3 mm |
2875 Gs
287.5 mT
|
24.74 kg / 54.55 lbs
24742.8 g / 242.7 N
|
critical level |
| 5 mm |
2556 Gs
255.6 mT
|
19.56 kg / 43.13 lbs
19563.2 g / 191.9 N
|
critical level |
| 10 mm |
1805 Gs
180.5 mT
|
9.75 kg / 21.50 lbs
9750.4 g / 95.7 N
|
medium risk |
| 15 mm |
1229 Gs
122.9 mT
|
4.52 kg / 9.96 lbs
4519.1 g / 44.3 N
|
medium risk |
| 20 mm |
836 Gs
83.6 mT
|
2.09 kg / 4.61 lbs
2092.9 g / 20.5 N
|
medium risk |
| 30 mm |
411 Gs
41.1 mT
|
0.51 kg / 1.11 lbs
505.7 g / 5.0 N
|
low risk |
| 50 mm |
132 Gs
13.2 mT
|
0.05 kg / 0.12 lbs
52.4 g / 0.5 N
|
low risk |
Table 2: Vertical load (wall)
MW 38x12 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
6.56 kg / 14.46 lbs
6558.0 g / 64.3 N
|
| 1 mm | Stal (~0.2) |
6.04 kg / 13.31 lbs
6036.0 g / 59.2 N
|
| 2 mm | Stal (~0.2) |
5.49 kg / 12.11 lbs
5492.0 g / 53.9 N
|
| 3 mm | Stal (~0.2) |
4.95 kg / 10.91 lbs
4948.0 g / 48.5 N
|
| 5 mm | Stal (~0.2) |
3.91 kg / 8.62 lbs
3912.0 g / 38.4 N
|
| 10 mm | Stal (~0.2) |
1.95 kg / 4.30 lbs
1950.0 g / 19.1 N
|
| 15 mm | Stal (~0.2) |
0.90 kg / 1.99 lbs
904.0 g / 8.9 N
|
| 20 mm | Stal (~0.2) |
0.42 kg / 0.92 lbs
418.0 g / 4.1 N
|
| 30 mm | Stal (~0.2) |
0.10 kg / 0.22 lbs
102.0 g / 1.0 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
10.0 g / 0.1 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 38x12 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
9.84 kg / 21.69 lbs
9837.0 g / 96.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
6.56 kg / 14.46 lbs
6558.0 g / 64.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
3.28 kg / 7.23 lbs
3279.0 g / 32.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
16.40 kg / 36.14 lbs
16395.0 g / 160.8 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 38x12 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.64 kg / 3.61 lbs
1639.5 g / 16.1 N
|
| 1 mm |
|
4.10 kg / 9.04 lbs
4098.8 g / 40.2 N
|
| 2 mm |
|
8.20 kg / 18.07 lbs
8197.5 g / 80.4 N
|
| 3 mm |
|
12.30 kg / 27.11 lbs
12296.3 g / 120.6 N
|
| 5 mm |
|
20.49 kg / 45.18 lbs
20493.8 g / 201.0 N
|
| 10 mm |
|
32.79 kg / 72.29 lbs
32790.0 g / 321.7 N
|
| 11 mm |
|
32.79 kg / 72.29 lbs
32790.0 g / 321.7 N
|
| 12 mm |
|
32.79 kg / 72.29 lbs
32790.0 g / 321.7 N
|
Table 5: Thermal stability (stability) - power drop
MW 38x12 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
32.79 kg / 72.29 lbs
32790.0 g / 321.7 N
|
OK |
| 40 °C | -2.2% |
32.07 kg / 70.70 lbs
32068.6 g / 314.6 N
|
OK |
| 60 °C | -4.4% |
31.35 kg / 69.11 lbs
31347.2 g / 307.5 N
|
|
| 80 °C | -6.6% |
30.63 kg / 67.52 lbs
30625.9 g / 300.4 N
|
|
| 100 °C | -28.8% |
23.35 kg / 51.47 lbs
23346.5 g / 229.0 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 38x12 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
76.58 kg / 168.83 lbs
4 859 Gs
|
11.49 kg / 25.32 lbs
11487 g / 112.7 N
|
N/A |
| 1 mm |
73.60 kg / 162.27 lbs
6 489 Gs
|
11.04 kg / 24.34 lbs
11040 g / 108.3 N
|
66.24 kg / 146.04 lbs
~0 Gs
|
| 2 mm |
70.49 kg / 155.40 lbs
6 350 Gs
|
10.57 kg / 23.31 lbs
10573 g / 103.7 N
|
63.44 kg / 139.86 lbs
~0 Gs
|
| 3 mm |
67.33 kg / 148.43 lbs
6 206 Gs
|
10.10 kg / 22.26 lbs
10099 g / 99.1 N
|
60.59 kg / 133.59 lbs
~0 Gs
|
| 5 mm |
60.95 kg / 134.38 lbs
5 905 Gs
|
9.14 kg / 20.16 lbs
9143 g / 89.7 N
|
54.86 kg / 120.94 lbs
~0 Gs
|
| 10 mm |
45.69 kg / 100.73 lbs
5 113 Gs
|
6.85 kg / 15.11 lbs
6853 g / 67.2 N
|
41.12 kg / 90.65 lbs
~0 Gs
|
| 20 mm |
22.77 kg / 50.20 lbs
3 609 Gs
|
3.42 kg / 7.53 lbs
3416 g / 33.5 N
|
20.49 kg / 45.18 lbs
~0 Gs
|
| 50 mm |
2.34 kg / 5.17 lbs
1 158 Gs
|
0.35 kg / 0.78 lbs
352 g / 3.5 N
|
2.11 kg / 4.65 lbs
~0 Gs
|
| 60 mm |
1.18 kg / 2.60 lbs
822 Gs
|
0.18 kg / 0.39 lbs
177 g / 1.7 N
|
1.06 kg / 2.34 lbs
~0 Gs
|
| 70 mm |
0.63 kg / 1.38 lbs
598 Gs
|
0.09 kg / 0.21 lbs
94 g / 0.9 N
|
0.56 kg / 1.24 lbs
~0 Gs
|
| 80 mm |
0.35 kg / 0.77 lbs
446 Gs
|
0.05 kg / 0.12 lbs
52 g / 0.5 N
|
0.31 kg / 0.69 lbs
~0 Gs
|
| 90 mm |
0.20 kg / 0.45 lbs
340 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
264 Gs
|
0.02 kg / 0.04 lbs
18 g / 0.2 N
|
0.11 kg / 0.24 lbs
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MW 38x12 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 17.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 13.5 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) | 3.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.5 cm |
Table 8: Collisions (cracking risk) - warning
MW 38x12 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
21.17 km/h
(5.88 m/s)
|
1.76 J | |
| 30 mm |
31.61 km/h
(8.78 m/s)
|
3.93 J | |
| 50 mm |
40.46 km/h
(11.24 m/s)
|
6.45 J | |
| 100 mm |
57.16 km/h
(15.88 m/s)
|
12.87 J |
Table 9: Coating parameters (durability)
MW 38x12 / 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 38x12 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 40 045 Mx | 400.5 µWb |
| Pc Coefficient | 0.42 | Low (Flat) |
Table 11: Physics of underwater searching
MW 38x12 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 32.79 kg | Standard |
| Water (riverbed) |
37.54 kg
(+4.75 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical surface, the magnet holds only approx. 20-30% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. computer case) significantly weakens the holding force.
3. Heat tolerance
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.42
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.
Chemical composition
| 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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Advantages and disadvantages of Nd2Fe14B magnets.
Pros
- They do not lose strength, even over around 10 years – the decrease in power is only ~1% (according to tests),
- They retain their magnetic properties even under strong external field,
- The use of an refined finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- Neodymium magnets ensure maximum magnetic induction on a their surface, which ensures high operational effectiveness,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
- Due to the option of flexible forming and adaptation to custom requirements, magnetic components can be manufactured in a variety of geometric configurations, which expands the range of possible applications,
- Versatile presence in modern technologies – they serve a role in mass storage devices, motor assemblies, diagnostic systems, also modern systems.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Cons
- To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Limited ability of creating nuts in the magnet and complex shapes - recommended is a housing - mounting mechanism.
- Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small components of these devices are able to complicate diagnosis medical when they are in the body.
- Due to expensive raw materials, their price exceeds standard values,
Holding force characteristics
Best holding force of the magnet in ideal parameters – what it depends on?
- with the contact of a sheet made of special test steel, ensuring full magnetic saturation
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- with a plane perfectly flat
- with direct contact (no paint)
- during detachment in a direction vertical to the plane
- in temp. approx. 20°C
Magnet lifting force in use – key factors
- Distance (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, rust or dirt).
- Force direction – remember 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 sheet causes magnetic saturation, causing part of the power to be escaped to the other side.
- Steel type – mild steel gives the best results. Higher carbon content decrease magnetic permeability and lifting capacity.
- Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
- Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.
Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate decreases the holding force.
Safety rules for work with NdFeB magnets
Maximum temperature
Do not overheat. NdFeB magnets are sensitive to heat. If you require operation above 80°C, inquire about special high-temperature series (H, SH, UH).
Impact on smartphones
Note: neodymium magnets produce a field that confuses sensitive sensors. Keep a safe distance from your mobile, device, and GPS.
Physical harm
Large magnets can break fingers in a fraction of a second. Never put your hand between two attracting surfaces.
This is not a toy
Adult use only. Tiny parts pose a choking risk, causing severe trauma. Store out of reach of kids and pets.
Handling guide
Use magnets with awareness. Their immense force can surprise even experienced users. Stay alert and respect their force.
Pacemakers
Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.
Protect data
Powerful magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.
Avoid contact if allergic
Nickel alert: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, cease working with magnets and wear gloves.
Do not drill into magnets
Powder generated during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Eye protection
Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
