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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 with VAT / pcs + price for transport

56.91 ZŁ net + 23% VAT / pcs

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Technical parameters 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
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 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

Physical simulation of the product - report

Presented data represent the direct effect of a mathematical analysis. Results are based on models for the material Nd2Fe14B. Real-world conditions may deviate from the simulation results. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - power drop
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
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
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: Sliding hold (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: Wall mounting (sliding) - 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: 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 stability (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: Magnet-Magnet interaction (attraction) - field collision
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 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 (electronics) - 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
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: Impact energy (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: Anti-corrosion coating durability
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: 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%
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)

*Caution: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Steel saturation

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

3. Power loss vs temp

*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.

Engineering data and GPSR
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%
Sustainability
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

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This product is an exceptionally strong cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø38x15 mm, guarantees the highest energy density. The MW 38x15 / N38 model boasts an accuracy of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod 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.
This model is perfect for building generators, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction 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 tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 38.1 mm) using two-component epoxy glues. To ensure stability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. 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 available off-the-shelf 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 key parameter here is the holding force amounting to approximately 40.08 kg (force ~393.18 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface 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. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Advantages and disadvantages of rare earth magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain full power for almost 10 years – the drop is just ~1% (in theory),
  • They feature excellent resistance to magnetic field loss as a result of opposing magnetic fields,
  • In other words, due to the reflective finish of nickel, the element is aesthetically pleasing,
  • Neodymium magnets ensure maximum magnetic induction on a their surface, which increases force concentration,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Due to the potential of free shaping and adaptation to custom requirements, neodymium magnets can be modeled in a wide range of shapes and sizes, which makes them more universal,
  • Universal use in future technologies – they serve a role in hard drives, brushless drives, precision medical tools, as well as technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Furthermore, tiny parts of these products can complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

Breakaway strength of the magnet in ideal conditionswhat affects it?

The lifting capacity listed is a result of laboratory testing conducted under specific, ideal conditions:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • with zero gap (no paint)
  • under vertical force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Please note that the working load may be lower influenced by elements below, starting with the most relevant:
  • Distance (betwixt the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material composition – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate decreases the holding force.

H&S for magnets
Combustion hazard

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this may cause fire.

This is not a toy

Adult use only. Tiny parts can be swallowed, leading to intestinal necrosis. Keep out of reach of children and animals.

Permanent damage

Do not overheat. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Danger to pacemakers

Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Nickel coating and allergies

Medical facts indicate that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent touching magnets with bare hands and choose versions in plastic housing.

Magnetic interference

An intense magnetic field interferes with the operation of compasses in phones and GPS navigation. Keep magnets close to a device to avoid damaging the sensors.

Keep away from computers

Do not bring magnets near a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Conscious usage

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Crushing force

Watch your fingers. Two large magnets will snap together immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Magnet fragility

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Danger! Learn more about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98