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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Product card - 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 |
Technical analysis of the assembly - data
The following values constitute the result of a engineering simulation. Values were calculated on algorithms for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Please consider these data as a preliminary roadmap when designing systems.
Table 1: Static pull force (force vs distance) - 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 pounds
40080.0 g / 393.2 N
|
critical level |
| 1 mm |
3668 Gs
366.8 mT
|
36.56 kg / 80.61 pounds
36563.4 g / 358.7 N
|
critical level |
| 2 mm |
3485 Gs
348.5 mT
|
33.01 kg / 72.78 pounds
33011.6 g / 323.8 N
|
critical level |
| 3 mm |
3297 Gs
329.7 mT
|
29.55 kg / 65.14 pounds
29545.5 g / 289.8 N
|
critical level |
| 5 mm |
2917 Gs
291.7 mT
|
23.13 kg / 50.99 pounds
23128.9 g / 226.9 N
|
critical level |
| 10 mm |
2049 Gs
204.9 mT
|
11.41 kg / 25.15 pounds
11406.3 g / 111.9 N
|
critical level |
| 15 mm |
1396 Gs
139.6 mT
|
5.30 kg / 11.68 pounds
5297.4 g / 52.0 N
|
strong |
| 20 mm |
954 Gs
95.4 mT
|
2.47 kg / 5.45 pounds
2473.1 g / 24.3 N
|
strong |
| 30 mm |
474 Gs
47.4 mT
|
0.61 kg / 1.35 pounds
610.3 g / 6.0 N
|
safe |
| 50 mm |
155 Gs
15.5 mT
|
0.07 kg / 0.14 pounds
65.6 g / 0.6 N
|
safe |
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 pounds
8016.0 g / 78.6 N
|
| 1 mm | Stal (~0.2) |
7.31 kg / 16.12 pounds
7312.0 g / 71.7 N
|
| 2 mm | Stal (~0.2) |
6.60 kg / 14.55 pounds
6602.0 g / 64.8 N
|
| 3 mm | Stal (~0.2) |
5.91 kg / 13.03 pounds
5910.0 g / 58.0 N
|
| 5 mm | Stal (~0.2) |
4.63 kg / 10.20 pounds
4626.0 g / 45.4 N
|
| 10 mm | Stal (~0.2) |
2.28 kg / 5.03 pounds
2282.0 g / 22.4 N
|
| 15 mm | Stal (~0.2) |
1.06 kg / 2.34 pounds
1060.0 g / 10.4 N
|
| 20 mm | Stal (~0.2) |
0.49 kg / 1.09 pounds
494.0 g / 4.8 N
|
| 30 mm | Stal (~0.2) |
0.12 kg / 0.27 pounds
122.0 g / 1.2 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
14.0 g / 0.1 N
|
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 pounds
12024.0 g / 118.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
8.02 kg / 17.67 pounds
8016.0 g / 78.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.01 kg / 8.84 pounds
4008.0 g / 39.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
20.04 kg / 44.18 pounds
20040.0 g / 196.6 N
|
Table 4: Steel thickness (saturation) - 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 pounds
2004.0 g / 19.7 N
|
| 1 mm |
|
5.01 kg / 11.05 pounds
5010.0 g / 49.1 N
|
| 2 mm |
|
10.02 kg / 22.09 pounds
10020.0 g / 98.3 N
|
| 3 mm |
|
15.03 kg / 33.14 pounds
15030.0 g / 147.4 N
|
| 5 mm |
|
25.05 kg / 55.23 pounds
25050.0 g / 245.7 N
|
| 10 mm |
|
40.08 kg / 88.36 pounds
40080.0 g / 393.2 N
|
| 11 mm |
|
40.08 kg / 88.36 pounds
40080.0 g / 393.2 N
|
| 12 mm |
|
40.08 kg / 88.36 pounds
40080.0 g / 393.2 N
|
Table 5: Thermal resistance (stability) - 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 pounds
40080.0 g / 393.2 N
|
OK |
| 40 °C | -2.2% |
39.20 kg / 86.42 pounds
39198.2 g / 384.5 N
|
OK |
| 60 °C | -4.4% |
38.32 kg / 84.47 pounds
38316.5 g / 375.9 N
|
|
| 80 °C | -6.6% |
37.43 kg / 82.53 pounds
37434.7 g / 367.2 N
|
|
| 100 °C | -28.8% |
28.54 kg / 62.91 pounds
28537.0 g / 279.9 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
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 pounds
5 235 Gs
|
15.47 kg / 34.10 pounds
15466 g / 151.7 N
|
N/A |
| 1 mm |
98.64 kg / 217.47 pounds
7 512 Gs
|
14.80 kg / 32.62 pounds
14796 g / 145.2 N
|
88.78 kg / 195.72 pounds
~0 Gs
|
| 2 mm |
94.06 kg / 207.36 pounds
7 336 Gs
|
14.11 kg / 31.10 pounds
14109 g / 138.4 N
|
84.65 kg / 186.63 pounds
~0 Gs
|
| 3 mm |
89.48 kg / 197.26 pounds
7 155 Gs
|
13.42 kg / 29.59 pounds
13421 g / 131.7 N
|
80.53 kg / 177.53 pounds
~0 Gs
|
| 5 mm |
80.42 kg / 177.30 pounds
6 783 Gs
|
12.06 kg / 26.60 pounds
12064 g / 118.3 N
|
72.38 kg / 159.57 pounds
~0 Gs
|
| 10 mm |
59.50 kg / 131.17 pounds
5 834 Gs
|
8.92 kg / 19.68 pounds
8925 g / 87.6 N
|
53.55 kg / 118.05 pounds
~0 Gs
|
| 20 mm |
29.34 kg / 64.69 pounds
4 097 Gs
|
4.40 kg / 9.70 pounds
4401 g / 43.2 N
|
26.41 kg / 58.22 pounds
~0 Gs
|
| 50 mm |
3.08 kg / 6.80 pounds
1 328 Gs
|
0.46 kg / 1.02 pounds
463 g / 4.5 N
|
2.78 kg / 6.12 pounds
~0 Gs
|
| 60 mm |
1.57 kg / 3.46 pounds
948 Gs
|
0.24 kg / 0.52 pounds
236 g / 2.3 N
|
1.41 kg / 3.12 pounds
~0 Gs
|
| 70 mm |
0.84 kg / 1.85 pounds
694 Gs
|
0.13 kg / 0.28 pounds
126 g / 1.2 N
|
0.76 kg / 1.67 pounds
~0 Gs
|
| 80 mm |
0.47 kg / 1.04 pounds
520 Gs
|
0.07 kg / 0.16 pounds
71 g / 0.7 N
|
0.42 kg / 0.94 pounds
~0 Gs
|
| 90 mm |
0.28 kg / 0.61 pounds
398 Gs
|
0.04 kg / 0.09 pounds
42 g / 0.4 N
|
0.25 kg / 0.55 pounds
~0 Gs
|
| 100 mm |
0.17 kg / 0.37 pounds
311 Gs
|
0.03 kg / 0.06 pounds
25 g / 0.2 N
|
0.15 kg / 0.33 pounds
~0 Gs
|
Table 7: Hazards (implants) - 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 |
| Timepiece | 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 (cracking risk) - 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: 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: Electrical data (Pc)
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. Vertical hold
*Caution: On a vertical wall, the magnet retains only ~20% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.
3. Thermal stability
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.50
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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Advantages as well as disadvantages of rare earth magnets.
Advantages
- They retain magnetic properties for almost ten years – the drop is just ~1% (according to analyses),
- Magnets perfectly protect themselves against loss of magnetization caused by ambient magnetic noise,
- Thanks to the reflective finish, the coating of nickel, gold-plated, or silver-plated gives an aesthetic appearance,
- Magnets are characterized by exceptionally strong magnetic induction on the working surface,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Thanks to freedom in constructing and the capacity to modify to specific needs,
- Key role in future technologies – they are used in computer drives, electromotive mechanisms, medical equipment, as well as modern systems.
- Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,
Weaknesses
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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 usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- Due to limitations in creating nuts and complex forms in magnets, we recommend using a housing - magnetic mechanism.
- 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, small components of these devices can disrupt the diagnostic process medical after entering the body.
- With large orders the cost of neodymium magnets is a challenge,
Holding force characteristics
Detachment force of the magnet in optimal conditions – what contributes to it?
- using a plate made of high-permeability steel, serving as a magnetic yoke
- whose transverse dimension equals approx. 10 mm
- characterized by even structure
- without any air gap between the magnet and steel
- under perpendicular force direction (90-degree angle)
- in temp. approx. 20°C
Key elements affecting lifting force
- Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of nominal force).
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Material composition – different alloys reacts the same. Alloy additives worsen the attraction effect.
- Plate texture – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
- Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under shearing force the holding force is lower. In addition, even a minimal clearance between the magnet and the plate reduces the load capacity.
Warnings
Nickel coating and allergies
Some people suffer from a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact can result in dermatitis. It is best to wear protective gloves.
Choking Hazard
Adult use only. Small elements can be swallowed, causing intestinal necrosis. Keep out of reach of kids and pets.
Physical harm
Danger of trauma: The pulling power is so immense that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.
Precision electronics
A strong magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Maintain magnets near a device to prevent damaging the sensors.
Life threat
Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Respect the power
Before use, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.
Electronic devices
Very strong magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Stay away of at least 10 cm.
Machining danger
Dust created during machining of magnets is flammable. Avoid drilling into magnets unless you are an expert.
Fragile material
Watch out for shards. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.
Heat sensitivity
Keep cool. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).
