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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

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70.00 ZŁ with VAT / pcs + price for transport

56.91 ZŁ net + 23% VAT / pcs

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Force along with appearance of a neodymium magnet can be estimated on our modular calculator.

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Technical details - 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 magnet - technical parameters

These values are the result of a engineering analysis. Values are based on algorithms for the material Nd2Fe14B. Real-world performance may deviate from the simulation results. Please consider these calculations as a reference point during assembly planning.

Table 1: Static 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 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
Grip strength weakens sharply with every mm of gap. Keep in mind that every additional insulation layer (e.g., dirt, paint, dust) significantly weakens the grip. Magnets work most effectively at the point of direct contact; gap drastically cuts the power. Analyze how flashily the pull force drop, when the magnet does not touch flatly to the steel surface. When calculating the mounting, avoid unnecessary gaps.

Table 2: Sliding force (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
The table below shows the estimated shear load necessary to cause the sliding of the magnet down along a upright steel plate (assuming typical friction coefficient). This parameter is relative to the gap size between the magnet and the surface.

Table 3: Wall mounting (sliding) - 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
When hanging a element on a vertical plane (e.g., a fridge), it will only hold just approx. 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient cause that holders move down faster than they pop off the substrate. Planning a vertical fastening? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the element will give way down under a noticeably lighter weight. Utilizing a rubberized pad can significantly increase the grip.

Table 4: Material efficiency (saturation) - 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
A thin metal plate is incapable of conduct the entire magnetic field, which squanders power of the holder. If you install a neodymium to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To achieve full efficiency of this magnet's power, you require a sufficiently solid backing of steel. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We advise picking the steel thickness according to the table below.

Table 5: Working in heat (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
Standard neodymium magnets irreversibly lose power above the temperature limit. Avoid high temperatures – heat can irreversibly destroy this magnet. With increasing heat, the neodymium's capacity momentarily drops. Avoid using this product close to heaters higher than its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
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
Two strong neodymiums interact from a wider radius than a magnet and sheet setup. The connection of magnet-to-magnet produces a massive flux and a wider radius of operation. Designing a powerful holder? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the pinch force is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*Field value in repulsion mode is approximately ~0 Gs at the midpoint of the gap (due to field cancellation).
Important: Estimates demonstrate shear force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (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
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
Powerful magnet radiation poses a real danger to electronic devices as well as medical implants. These NdFeB products generate a field that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and glass. Special caution must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
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
Neodymium magnets are prone to chipping – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can cause material chips or injury to fingers. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when working with large magnets.

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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Flux value emitted by the magnet pole. Essential parameter when building generators as well as sensors. The Pc coefficient defines the working geometry.

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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds merely a fraction of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Thermal stability

*For N38 material, the max working temp 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
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
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Pulling force
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This product is a very strong rod magnet, composed of modern NdFeB material, which, at dimensions of Ø38x15 mm, guarantees the highest energy density. This specific item boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 40.08 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing 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 pull force of 393.18 N with a weight of only 127.59 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure long-term durability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. 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.
The presented product is a neodymium magnet with precisely defined parameters: diameter 38 mm and height 15 mm. The key parameter here is the lifting capacity amounting to approximately 40.08 kg (force ~393.18 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 15 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 through the diameter if your project requires it.

Pros and cons of Nd2Fe14B magnets.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
  • They maintain their magnetic properties even under external field action,
  • In other words, due to the metallic surface of silver, the element looks attractive,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in designing and the capacity to adapt to complex applications,
  • Huge importance in future technologies – they are used in HDD drives, electric motors, diagnostic systems, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. Additionally, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum magnetic pulling force – what affects it?

The lifting capacity listed is a theoretical maximum value performed under specific, ideal conditions:
  • on a base made of structural steel, effectively closing the magnetic flux
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • characterized by lack of roughness
  • with zero gap (without paint)
  • under vertical force direction (90-degree angle)
  • at temperature room level

Magnet lifting force in use – key factors

Effective lifting capacity is affected by specific conditions, including (from most important):
  • Air gap (between the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Steel type – mild steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
  • Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate reduces the holding force.

H&S for magnets
Heat warning

Control the heat. Heating the magnet to high heat will ruin its properties and pulling force.

Keep away from children

NdFeB magnets are not intended for children. Eating several magnets may result in them attracting across intestines, which constitutes a direct threat to life and necessitates urgent medical intervention.

Flammability

Powder generated during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Data carriers

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

Impact on smartphones

An intense magnetic field disrupts the operation of compasses in phones and navigation systems. Do not bring magnets close to a device to prevent breaking the sensors.

Beware of splinters

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

Medical interference

For implant holders: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or request help to work with the magnets.

Nickel coating and allergies

A percentage of the population have a contact allergy to Ni, which is the standard coating for NdFeB magnets. Extended handling can result in a rash. We suggest use protective gloves.

Powerful field

Be careful. Rare earth magnets act from a distance and connect with huge force, often quicker than you can move away.

Finger safety

Large magnets can crush fingers instantly. Never put your hand betwixt two strong magnets.

Safety First! Details about hazards in the article: Magnet Safety Guide.