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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 - 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
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

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
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: 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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

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.

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%

Ecology and recycling (GPSR)

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
Magnet Unit Converter

Pulling force


Magnetic Induction

Check out also products

The offered product is an incredibly powerful cylindrical magnet, composed of modern NdFeB material, which, with dimensions of Ø38x15 mm, guarantees maximum efficiency. This specific item boasts an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 40.08 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 393.18 N with a weight of only 127.59 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest 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 store.
This model is characterized by dimensions Ø38x15 mm, which, at a weight of 127.59 g, makes it an element with high 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.
This cylinder is magnetized axially (along the height of 15 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard 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.

Advantages and disadvantages of neodymium magnets.

Pros

Apart from their strong power, neodymium magnets have these key benefits:
  • 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

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • 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?

The lifting capacity listed is a theoretical maximum value conducted under standard conditions:
  • 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

It is worth knowing that the magnet holding will differ influenced by elements below, starting with the most relevant:
  • 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.

Attention! Looking for details? Read our article: Are neodymium magnets dangerous?