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
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
56.91 zł net / pcs
70.00 zł with VAT (23% VAT) / pcs
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Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical - 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 product - data
The following information are the direct effect of a mathematical analysis. Results are based on models for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Treat these data as a supplementary guide when designing systems.
Table 1: Static force (force vs gap) - interaction chart
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
|
critical level |
| 1 mm |
3668 Gs
366.8 mT
|
36.56 kg / 80.61 lbs
36563.4 g / 358.7 N
|
critical level |
| 2 mm |
3485 Gs
348.5 mT
|
33.01 kg / 72.78 lbs
33011.6 g / 323.8 N
|
critical level |
| 3 mm |
3297 Gs
329.7 mT
|
29.55 kg / 65.14 lbs
29545.5 g / 289.8 N
|
critical level |
| 5 mm |
2917 Gs
291.7 mT
|
23.13 kg / 50.99 lbs
23128.9 g / 226.9 N
|
critical level |
| 10 mm |
2049 Gs
204.9 mT
|
11.41 kg / 25.15 lbs
11406.3 g / 111.9 N
|
critical level |
| 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
|
weak grip |
| 50 mm |
155 Gs
15.5 mT
|
0.07 kg / 0.14 lbs
65.6 g / 0.6 N
|
weak grip |
Table 2: Sliding load (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: Vertical assembly (shearing) - 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: Steel thickness (substrate influence) - sheet metal selection
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: Working in heat (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: Two magnets (repulsion) - forces in the system
MW 38x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (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 (implants) - warnings
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 |
| Mobile device | 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 |
21.90 km/h
(6.08 m/s)
|
2.36 J | |
| 30 mm |
24.94 km/h
(6.93 m/s)
|
3.06 J | |
| 50 mm |
25.12 km/h
(6.98 m/s)
|
3.11 J | |
| 100 mm |
25.15 km/h
(6.99 m/s)
|
3.11 J |
Table 9: Surface protection spec
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: Submerged application
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)
*Warning: On a vertical surface, the magnet retains only approx. 20-30% of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) drastically limits the holding force.
3. Power loss vs temp
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.50
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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Advantages and disadvantages of neodymium magnets.
Pros
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
- They maintain their magnetic properties even under close interference source,
- A magnet with a smooth nickel surface looks better,
- The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of custom modeling as well as adjusting to defined needs,
- Wide application in high-tech industry – they are commonly used in magnetic memories, electric drive systems, diagnostic systems, also modern systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Limitations
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
- When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
- We suggest cover - magnetic mount, due to difficulties in realizing nuts inside the magnet and complex forms.
- Health risk to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these products are able to complicate diagnosis medical in case of swallowing.
- With budget limitations the cost of neodymium magnets is economically unviable,
Holding force characteristics
Maximum holding power of the magnet – what affects it?
- using a sheet made of high-permeability steel, functioning as a circuit closing element
- whose thickness is min. 10 mm
- with a plane free of scratches
- under conditions of ideal adhesion (metal-to-metal)
- for force acting at a right angle (in the magnet axis)
- at conditions approx. 20°C
Key elements affecting lifting force
- Air gap (between the magnet and the plate), as even a very small distance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to paint, rust or dirt).
- Load vector – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
- Plate thickness – insufficiently thick steel does not accept the full field, causing part of the power to be lost to the other side.
- Steel grade – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
- Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
- Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.
Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however 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 lifting capacity.
Warnings
Sensitization to coating
It is widely known that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, prevent direct skin contact or opt for encased magnets.
Permanent damage
Avoid heat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, look for HT versions (H, SH, UH).
Life threat
Patients with a pacemaker should maintain an large gap from magnets. The magnetic field can interfere with the functioning of the implant.
Hand protection
Danger of trauma: The pulling power is so great that it can result in hematomas, pinching, and even bone fractures. Use thick gloves.
Do not drill into magnets
Powder created during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
No play value
Strictly store magnets away from children. Ingestion danger is significant, and the effects of magnets clamping inside the body are very dangerous.
Protect data
Intense magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.
Handling rules
Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.
Precision electronics
Be aware: rare earth magnets produce a field that confuses sensitive sensors. Maintain a safe distance from your phone, tablet, and GPS.
Eye protection
NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets leads to them shattering into small pieces.
