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 details - 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 |
Engineering analysis of the assembly - technical parameters
Presented data are the result of a physical calculation. Values are based on algorithms for the material Nd2Fe14B. Operational parameters may differ. Treat these calculations as a supplementary guide for designers.
Table 1: Static pull force (pull vs distance) - characteristics
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
|
dangerous! |
| 1 mm |
3668 Gs
366.8 mT
|
36.56 kg / 80.61 pounds
36563.4 g / 358.7 N
|
dangerous! |
| 2 mm |
3485 Gs
348.5 mT
|
33.01 kg / 72.78 pounds
33011.6 g / 323.8 N
|
dangerous! |
| 3 mm |
3297 Gs
329.7 mT
|
29.55 kg / 65.14 pounds
29545.5 g / 289.8 N
|
dangerous! |
| 5 mm |
2917 Gs
291.7 mT
|
23.13 kg / 50.99 pounds
23128.9 g / 226.9 N
|
dangerous! |
| 10 mm |
2049 Gs
204.9 mT
|
11.41 kg / 25.15 pounds
11406.3 g / 111.9 N
|
dangerous! |
| 15 mm |
1396 Gs
139.6 mT
|
5.30 kg / 11.68 pounds
5297.4 g / 52.0 N
|
warning |
| 20 mm |
954 Gs
95.4 mT
|
2.47 kg / 5.45 pounds
2473.1 g / 24.3 N
|
warning |
| 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: Shear hold (wall)
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: Material efficiency (saturation) - power losses
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 (repulsion) - field range
MW 38x15 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear 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: Safety (HSE) (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: Collisions (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: Corrosion resistance
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: 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. Shear force
*Caution: On a vertical wall, the magnet retains just a fraction of its max power.
2. Plate thickness effect
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Temperature resistance
*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
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.
Elemental analysis
| 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
Strengths as well as weaknesses of Nd2Fe14B magnets.
Advantages
- They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
- They are noted for resistance to demagnetization induced by external magnetic fields,
- A magnet with a metallic silver surface looks better,
- They show high magnetic induction at the operating surface, which improves attraction properties,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
- Thanks to versatility in designing and the ability to modify to client solutions,
- Fundamental importance in electronics industry – they serve a role in HDD drives, electric motors, advanced medical instruments, as well as industrial machines.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Limitations
- 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 power 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- Limited possibility of making nuts in the magnet and complex shapes - preferred is casing - magnet mounting.
- 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. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
- Due to expensive raw materials, their price exceeds standard values,
Holding force characteristics
Best holding force of the magnet in ideal parameters – what contributes to it?
- on a block made of structural steel, optimally conducting the magnetic field
- whose transverse dimension is min. 10 mm
- characterized by even structure
- without any insulating layer between the magnet and steel
- during detachment in a direction vertical to the mounting surface
- at temperature room level
Practical aspects of lifting capacity – factors
- Distance (betwixt the magnet and the plate), as even a tiny distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, rust or dirt).
- Load vector – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
- Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures decrease magnetic permeability and holding force.
- Surface quality – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
- Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, however under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet and the plate reduces the holding force.
H&S for magnets
Threat to electronics
Device Safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).
Machining danger
Powder created during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
Magnets are brittle
Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.
Safe operation
Handle magnets with awareness. Their immense force can surprise even professionals. Be vigilant and respect their force.
Do not overheat magnets
Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.
Crushing risk
Large magnets can smash fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.
No play value
Strictly store magnets away from children. Ingestion danger is high, and the effects of magnets connecting inside the body are fatal.
Warning for heart patients
Life threat: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.
GPS and phone interference
GPS units and smartphones are highly sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the sensors in your phone.
Metal Allergy
Certain individuals experience a sensitization to nickel, which is the common plating for NdFeB magnets. Extended handling can result in a rash. We strongly advise wear safety gloves.
