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MW 38x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010061

GTIN/EAN: 5906301810605

Load capacity 40.08 kg / 393.18 N Magnetic Induction 384.07 mT / 3841 Gs
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

56.91net / pcs

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Net
Gross
price from 1 pcs
56.91 zł
70.00 zł
price from 20 pcs
53.50 zł
65.80 zł
price from 50 pcs
50.08 zł
61.60 zł

Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

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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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical data of the product - MW 38x15 / N38 - cylindrical magnet

Specification / characteristics - MW 38x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010061
GTIN/EAN 5906301810605
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
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

Specification / characteristics MW 38x15 / N38 - cylindrical magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°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

Physical analysis of the assembly - technical parameters

These information are the direct effect of a physical simulation. Values were calculated on algorithms for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these calculations as a reference point when designing systems.

Table 1: Static pull force (pull 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
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
warning
20 mm 954 Gs
95.4 mT
2.47 kg / 5.45 LBS
2473.1 g / 24.3 N
warning
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: 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 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 (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 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
5%
2.00 kg / 4.42 LBS
2004.0 g / 19.7 N
1 mm
13%
5.01 kg / 11.05 LBS
5010.0 g / 49.1 N
2 mm
25%
10.02 kg / 22.09 LBS
10020.0 g / 98.3 N
3 mm
38%
15.03 kg / 33.14 LBS
15030.0 g / 147.4 N
5 mm
63%
25.05 kg / 55.23 LBS
25050.0 g / 245.7 N
10 mm
100%
40.08 kg / 88.36 LBS
40080.0 g / 393.2 N
11 mm
100%
40.08 kg / 88.36 LBS
40080.0 g / 393.2 N
12 mm
100%
40.08 kg / 88.36 LBS
40080.0 g / 393.2 N

Table 5: Thermal resistance (stability) - power drop
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) Lateral 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 (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
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: Dynamics (kinetic energy) - warning
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: Electrical 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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

1. Shear force

*Warning: On a vertical wall, the magnet retains just a fraction of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Heat tolerance

*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.

Technical and environmental data

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%

Environmental data

recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 010061-2026
Measurement Calculator

Pulling force


Magnetic Field

Check out also products

This product is an incredibly powerful cylindrical magnet, manufactured from durable NdFeB material, which, with dimensions of Ø38x15 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 40.08 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 393.18 N with a weight of only 127.59 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 38.1 mm) using epoxy glues. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø38x15), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø38x15 mm, which, at a weight of 127.59 g, makes it an element with impressive magnetic energy density. The value of 393.18 N means that the magnet is capable of holding a weight many times exceeding its own mass of 127.59 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 38 mm. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Benefits

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • They retain full power for nearly 10 years – the drop is just ~1% (in theory),
  • Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
  • In other words, due to the shiny layer of silver, the element becomes visually attractive,
  • The surface of neodymium magnets generates a unique magnetic field – this is a key 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...
  • Considering the ability of flexible shaping and adaptation to specialized requirements, magnetic components can be created in a wide range of forms and dimensions, which makes them more universal,
  • Significant place in innovative solutions – they find application in mass storage devices, brushless drives, diagnostic systems, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in small systems

Cons

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in creating nuts and complex forms in magnets, we recommend using casing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

The lifting capacity listed is a theoretical maximum value performed under specific, ideal conditions:
  • using a sheet made of high-permeability steel, serving as a magnetic yoke
  • with a thickness no less than 10 mm
  • characterized by lack of roughness
  • without the slightest air gap between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature room level

Practical aspects of lifting capacity – factors

Holding efficiency is influenced by working environment parameters, such as (from priority):
  • Clearance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (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 type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal conditions – neodymium magnets 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 assessed with the use of a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Warnings
Warning for heart patients

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Keep away from children

Strictly store magnets out of reach of children. Choking hazard is significant, and the effects of magnets clamping inside the body are very dangerous.

Do not overheat magnets

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Compass and GPS

Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Conscious usage

Handle magnets consciously. Their powerful strength can shock even professionals. Stay alert and respect their power.

Finger safety

Big blocks can smash fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Threat to electronics

Avoid bringing magnets close to a purse, computer, or TV. The magnetism can destroy these devices and erase data from cards.

Beware of splinters

Watch out for shards. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Allergy Warning

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If redness appears, immediately stop handling magnets and use protective gear.

Fire warning

Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

Attention! Learn more about hazards in the article: Safety of working with magnets.