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 magnet - data
These values constitute the result of a mathematical calculation. Results rely on algorithms for the material Nd2Fe14B. Real-world conditions may differ. Use these data as a reference point for designers.
Table 1: Static pull force (force vs gap) - 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
|
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
|
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
|
low risk |
| 50 mm |
155 Gs
15.5 mT
|
0.07 kg / 0.14 pounds
65.6 g / 0.6 N
|
low risk |
Table 2: Shear capacity (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) - 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 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) - 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 stability (stability) - resistance threshold
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: Two magnets (repulsion) - field range
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: Safety (HSE) (electronics) - 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 |
| Phone / Smartphone | 40 Gs (4.0 mT) | 9.0 cm |
| Car key | 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: Dynamics (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: 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: Hydrostatics and buoyancy
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 surface, the magnet retains merely a fraction of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Temperature resistance
*For standard magnets, 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
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros and cons of rare earth magnets.
Pros
- They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (according to theory),
- They show high resistance to demagnetization induced by external disturbances,
- In other words, due to the glossy finish of nickel, the element looks attractive,
- Neodymium magnets generate maximum magnetic induction on a small area, which allows for strong attraction,
- 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...
- In view of the potential of accurate forming and customization to unique solutions, neodymium magnets can be produced in a variety of shapes and sizes, which amplifies use scope,
- Huge importance in modern technologies – they are commonly used in magnetic memories, electric motors, diagnostic systems, also modern systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Limited possibility of creating nuts in the magnet and complex shapes - recommended is cover - magnet mounting.
- Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities
Pull force analysis
Magnetic strength at its maximum – what affects it?
- using a plate made of low-carbon steel, serving as a magnetic yoke
- with a cross-section of at least 10 mm
- characterized by smoothness
- with zero gap (no impurities)
- during pulling in a direction vertical to the plane
- at standard ambient temperature
Determinants of lifting force in real conditions
- Clearance – existence of foreign body (rust, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
- Load vector – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
- Steel thickness – too thin plate does not close the flux, causing part of the flux to be lost to the other side.
- Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
- Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
- Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.
Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a small distance between the magnet and the plate lowers the lifting capacity.
Safe handling of neodymium magnets
Pacemakers
For implant holders: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or request help to work with the magnets.
Risk of cracking
Despite metallic appearance, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Allergy Warning
Some people have a hypersensitivity to Ni, which is the standard coating for NdFeB magnets. Frequent touching may cause dermatitis. It is best to use protective gloves.
Choking Hazard
Adult use only. Small elements pose a choking risk, causing severe trauma. Store out of reach of kids and pets.
Keep away from electronics
A strong magnetic field interferes with the operation of compasses in smartphones and navigation systems. Do not bring magnets close to a smartphone to avoid damaging the sensors.
Protect data
Device Safety: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, timepieces).
Operating temperature
Control the heat. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.
Physical harm
Danger of trauma: The pulling power is so immense that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.
Handling guide
Handle with care. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can react.
Flammability
Dust created during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
