MW 38x15 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010061
GTIN/EAN: 5906301810605
Diameter Ø
38 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
127.59 g
Magnetization Direction
↑ axial
Load capacity
40.08 kg / 393.18 N
Magnetic Induction
384.07 mT / 3841 Gs
Coating
[NiCuNi] Nickel
70.00 ZŁ with VAT / pcs + price for transport
56.91 ZŁ net + 23% VAT / pcs
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Technical parameters of the product - MW 38x15 / N38 - cylindrical magnet
Specification / characteristics - MW 38x15 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010061 |
| GTIN/EAN | 5906301810605 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 38 mm [±0,1 mm] |
| Height | 15 mm [±0,1 mm] |
| Weight | 127.59 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 40.08 kg / 393.18 N |
| Magnetic Induction ~ ? | 384.07 mT / 3841 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 simulation of the product - report
Presented data represent the direct effect of a mathematical analysis. Results are based on models for the material Nd2Fe14B. Real-world conditions may deviate from the simulation results. Please consider these calculations as a preliminary roadmap during assembly planning.
Table 1: Static pull force (pull vs gap) - power drop
MW 38x15 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3840 Gs
384.0 mT
|
40.08 kg / 88.36 LBS
40080.0 g / 393.2 N
|
crushing |
| 1 mm |
3668 Gs
366.8 mT
|
36.56 kg / 80.61 LBS
36563.4 g / 358.7 N
|
crushing |
| 2 mm |
3485 Gs
348.5 mT
|
33.01 kg / 72.78 LBS
33011.6 g / 323.8 N
|
crushing |
| 3 mm |
3297 Gs
329.7 mT
|
29.55 kg / 65.14 LBS
29545.5 g / 289.8 N
|
crushing |
| 5 mm |
2917 Gs
291.7 mT
|
23.13 kg / 50.99 LBS
23128.9 g / 226.9 N
|
crushing |
| 10 mm |
2049 Gs
204.9 mT
|
11.41 kg / 25.15 LBS
11406.3 g / 111.9 N
|
crushing |
| 15 mm |
1396 Gs
139.6 mT
|
5.30 kg / 11.68 LBS
5297.4 g / 52.0 N
|
medium risk |
| 20 mm |
954 Gs
95.4 mT
|
2.47 kg / 5.45 LBS
2473.1 g / 24.3 N
|
medium risk |
| 30 mm |
474 Gs
47.4 mT
|
0.61 kg / 1.35 LBS
610.3 g / 6.0 N
|
low risk |
| 50 mm |
155 Gs
15.5 mT
|
0.07 kg / 0.14 LBS
65.6 g / 0.6 N
|
low risk |
Table 2: Sliding hold (vertical surface)
MW 38x15 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
8.02 kg / 17.67 LBS
8016.0 g / 78.6 N
|
| 1 mm | Stal (~0.2) |
7.31 kg / 16.12 LBS
7312.0 g / 71.7 N
|
| 2 mm | Stal (~0.2) |
6.60 kg / 14.55 LBS
6602.0 g / 64.8 N
|
| 3 mm | Stal (~0.2) |
5.91 kg / 13.03 LBS
5910.0 g / 58.0 N
|
| 5 mm | Stal (~0.2) |
4.63 kg / 10.20 LBS
4626.0 g / 45.4 N
|
| 10 mm | Stal (~0.2) |
2.28 kg / 5.03 LBS
2282.0 g / 22.4 N
|
| 15 mm | Stal (~0.2) |
1.06 kg / 2.34 LBS
1060.0 g / 10.4 N
|
| 20 mm | Stal (~0.2) |
0.49 kg / 1.09 LBS
494.0 g / 4.8 N
|
| 30 mm | Stal (~0.2) |
0.12 kg / 0.27 LBS
122.0 g / 1.2 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.03 LBS
14.0 g / 0.1 N
|
Table 3: Wall mounting (sliding) - vertical pull
MW 38x15 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
12.02 kg / 26.51 LBS
12024.0 g / 118.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
8.02 kg / 17.67 LBS
8016.0 g / 78.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.01 kg / 8.84 LBS
4008.0 g / 39.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
20.04 kg / 44.18 LBS
20040.0 g / 196.6 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 38x15 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.00 kg / 4.42 LBS
2004.0 g / 19.7 N
|
| 1 mm |
|
5.01 kg / 11.05 LBS
5010.0 g / 49.1 N
|
| 2 mm |
|
10.02 kg / 22.09 LBS
10020.0 g / 98.3 N
|
| 3 mm |
|
15.03 kg / 33.14 LBS
15030.0 g / 147.4 N
|
| 5 mm |
|
25.05 kg / 55.23 LBS
25050.0 g / 245.7 N
|
| 10 mm |
|
40.08 kg / 88.36 LBS
40080.0 g / 393.2 N
|
| 11 mm |
|
40.08 kg / 88.36 LBS
40080.0 g / 393.2 N
|
| 12 mm |
|
40.08 kg / 88.36 LBS
40080.0 g / 393.2 N
|
Table 5: Thermal stability (material behavior) - thermal limit
MW 38x15 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
40.08 kg / 88.36 LBS
40080.0 g / 393.2 N
|
OK |
| 40 °C | -2.2% |
39.20 kg / 86.42 LBS
39198.2 g / 384.5 N
|
OK |
| 60 °C | -4.4% |
38.32 kg / 84.47 LBS
38316.5 g / 375.9 N
|
|
| 80 °C | -6.6% |
37.43 kg / 82.53 LBS
37434.7 g / 367.2 N
|
|
| 100 °C | -28.8% |
28.54 kg / 62.91 LBS
28537.0 g / 279.9 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 38x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
103.10 kg / 227.31 LBS
5 235 Gs
|
15.47 kg / 34.10 LBS
15466 g / 151.7 N
|
N/A |
| 1 mm |
98.64 kg / 217.47 LBS
7 512 Gs
|
14.80 kg / 32.62 LBS
14796 g / 145.2 N
|
88.78 kg / 195.72 LBS
~0 Gs
|
| 2 mm |
94.06 kg / 207.36 LBS
7 336 Gs
|
14.11 kg / 31.10 LBS
14109 g / 138.4 N
|
84.65 kg / 186.63 LBS
~0 Gs
|
| 3 mm |
89.48 kg / 197.26 LBS
7 155 Gs
|
13.42 kg / 29.59 LBS
13421 g / 131.7 N
|
80.53 kg / 177.53 LBS
~0 Gs
|
| 5 mm |
80.42 kg / 177.30 LBS
6 783 Gs
|
12.06 kg / 26.60 LBS
12064 g / 118.3 N
|
72.38 kg / 159.57 LBS
~0 Gs
|
| 10 mm |
59.50 kg / 131.17 LBS
5 834 Gs
|
8.92 kg / 19.68 LBS
8925 g / 87.6 N
|
53.55 kg / 118.05 LBS
~0 Gs
|
| 20 mm |
29.34 kg / 64.69 LBS
4 097 Gs
|
4.40 kg / 9.70 LBS
4401 g / 43.2 N
|
26.41 kg / 58.22 LBS
~0 Gs
|
| 50 mm |
3.08 kg / 6.80 LBS
1 328 Gs
|
0.46 kg / 1.02 LBS
463 g / 4.5 N
|
2.78 kg / 6.12 LBS
~0 Gs
|
| 60 mm |
1.57 kg / 3.46 LBS
948 Gs
|
0.24 kg / 0.52 LBS
236 g / 2.3 N
|
1.41 kg / 3.12 LBS
~0 Gs
|
| 70 mm |
0.84 kg / 1.85 LBS
694 Gs
|
0.13 kg / 0.28 LBS
126 g / 1.2 N
|
0.76 kg / 1.67 LBS
~0 Gs
|
| 80 mm |
0.47 kg / 1.04 LBS
520 Gs
|
0.07 kg / 0.16 LBS
71 g / 0.7 N
|
0.42 kg / 0.94 LBS
~0 Gs
|
| 90 mm |
0.28 kg / 0.61 LBS
398 Gs
|
0.04 kg / 0.09 LBS
42 g / 0.4 N
|
0.25 kg / 0.55 LBS
~0 Gs
|
| 100 mm |
0.17 kg / 0.37 LBS
311 Gs
|
0.03 kg / 0.06 LBS
25 g / 0.2 N
|
0.15 kg / 0.33 LBS
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MW 38x15 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 18.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 14.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 11.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 9.0 cm |
| Remote | 50 Gs (5.0 mT) | 8.0 cm |
| Payment card | 400 Gs (40.0 mT) | 3.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MW 38x15 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.81 km/h
(5.78 m/s)
|
2.13 J | |
| 30 mm |
31.25 km/h
(8.68 m/s)
|
4.81 J | |
| 50 mm |
40.01 km/h
(11.11 m/s)
|
7.88 J | |
| 100 mm |
56.53 km/h
(15.70 m/s)
|
15.73 J |
Table 9: Anti-corrosion coating durability
MW 38x15 / 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 38x15 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 45 065 Mx | 450.7 µWb |
| Pc Coefficient | 0.50 | Low (Flat) |
Table 11: Physics of underwater searching
MW 38x15 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 40.08 kg | Standard |
| Water (riverbed) |
45.89 kg
(+5.81 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. computer case) drastically limits the holding force.
3. Power loss vs temp
*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) = 0.50
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.
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% |
Sustainability
| 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 rare earth magnets.
Strengths
- They retain full power for almost 10 years – the drop is just ~1% (in theory),
- They feature excellent resistance to magnetic field loss as a result of opposing magnetic fields,
- In other words, due to the reflective finish of nickel, the element is aesthetically pleasing,
- Neodymium magnets ensure maximum magnetic induction on a their surface, which increases force concentration,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Due to the potential of free shaping and adaptation to custom requirements, neodymium magnets can be modeled in a wide range of shapes and sizes, which makes them more universal,
- Universal use in future technologies – they serve a role in hard drives, brushless drives, precision medical tools, as well as technologically advanced constructions.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Cons
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
- We recommend a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated shapes.
- Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Furthermore, tiny parts of these products can complicate diagnosis medical after entering the body.
- With mass production the cost of neodymium magnets is economically unviable,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what affects it?
- with the contact of a yoke made of special test steel, ensuring full magnetic saturation
- possessing a massiveness of at least 10 mm to ensure full flux closure
- characterized by lack of roughness
- with zero gap (no paint)
- under vertical force direction (90-degree angle)
- at temperature approx. 20 degrees Celsius
Practical aspects of lifting capacity – factors
- Distance (betwixt the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
- Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
- Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
- Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate decreases the holding force.
H&S for magnets
Combustion hazard
Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this may cause fire.
This is not a toy
Adult use only. Tiny parts can be swallowed, leading to intestinal necrosis. Keep out of reach of children and animals.
Permanent damage
Do not overheat. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, look for HT versions (H, SH, UH).
Danger to pacemakers
Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.
Nickel coating and allergies
Medical facts indicate that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent touching magnets with bare hands and choose versions in plastic housing.
Magnetic interference
An intense magnetic field interferes with the operation of compasses in phones and GPS navigation. Keep magnets close to a device to avoid damaging the sensors.
Keep away from computers
Do not bring magnets near a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.
Conscious usage
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.
Crushing force
Watch your fingers. Two large magnets will snap together immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!
Magnet fragility
Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
