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MW 15x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010029

GTIN/EAN: 5906301810285

5.00

Diameter Ø

15 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

3.98 g

Magnetization Direction

↑ axial

Load capacity

2.87 kg / 28.14 N

Magnetic Induction

230.16 mT / 2302 Gs

Coating

[NiCuNi] Nickel

1.624 with VAT / pcs + price for transport

1.320 ZŁ net + 23% VAT / pcs

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Parameters as well as structure of a magnet can be analyzed with our force calculator.

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Physical properties - MW 15x3 / N38 - cylindrical magnet

Specification / characteristics - MW 15x3 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010029
GTIN/EAN 5906301810285
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 15 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 3.98 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.87 kg / 28.14 N
Magnetic Induction ~ ? 230.16 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 15x3 / 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 - data

Presented information are the result of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Actual performance might slightly differ from theoretical values. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - characteristics
MW 15x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2301 Gs
230.1 mT
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
warning
1 mm 2098 Gs
209.8 mT
2.39 kg / 5.26 pounds
2386.5 g / 23.4 N
warning
2 mm 1842 Gs
184.2 mT
1.84 kg / 4.05 pounds
1838.5 g / 18.0 N
low risk
3 mm 1570 Gs
157.0 mT
1.34 kg / 2.95 pounds
1337.0 g / 13.1 N
low risk
5 mm 1084 Gs
108.4 mT
0.64 kg / 1.40 pounds
637.0 g / 6.2 N
low risk
10 mm 410 Gs
41.0 mT
0.09 kg / 0.20 pounds
91.3 g / 0.9 N
low risk
15 mm 178 Gs
17.8 mT
0.02 kg / 0.04 pounds
17.1 g / 0.2 N
low risk
20 mm 89 Gs
8.9 mT
0.00 kg / 0.01 pounds
4.3 g / 0.0 N
low risk
30 mm 31 Gs
3.1 mT
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
low risk
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk

Table 2: Shear load (wall)
MW 15x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.57 kg / 1.27 pounds
574.0 g / 5.6 N
1 mm Stal (~0.2) 0.48 kg / 1.05 pounds
478.0 g / 4.7 N
2 mm Stal (~0.2) 0.37 kg / 0.81 pounds
368.0 g / 3.6 N
3 mm Stal (~0.2) 0.27 kg / 0.59 pounds
268.0 g / 2.6 N
5 mm Stal (~0.2) 0.13 kg / 0.28 pounds
128.0 g / 1.3 N
10 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - vertical pull
MW 15x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.86 kg / 1.90 pounds
861.0 g / 8.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.57 kg / 1.27 pounds
574.0 g / 5.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.29 kg / 0.63 pounds
287.0 g / 2.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.44 kg / 3.16 pounds
1435.0 g / 14.1 N

Table 4: Material efficiency (saturation) - power losses
MW 15x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.29 kg / 0.63 pounds
287.0 g / 2.8 N
1 mm
25%
0.72 kg / 1.58 pounds
717.5 g / 7.0 N
2 mm
50%
1.44 kg / 3.16 pounds
1435.0 g / 14.1 N
3 mm
75%
2.15 kg / 4.75 pounds
2152.5 g / 21.1 N
5 mm
100%
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
10 mm
100%
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
11 mm
100%
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
12 mm
100%
2.87 kg / 6.33 pounds
2870.0 g / 28.2 N

Table 5: Working in heat (material behavior) - power drop
MW 15x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
OK
40 °C -2.2% 2.81 kg / 6.19 pounds
2806.9 g / 27.5 N
OK
60 °C -4.4% 2.74 kg / 6.05 pounds
2743.7 g / 26.9 N
80 °C -6.6% 2.68 kg / 5.91 pounds
2680.6 g / 26.3 N
100 °C -28.8% 2.04 kg / 4.51 pounds
2043.4 g / 20.0 N

Table 6: Two magnets (attraction) - forces in the system
MW 15x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.77 kg / 12.72 pounds
3 869 Gs
0.87 kg / 1.91 pounds
865 g / 8.5 N
N/A
1 mm 5.32 kg / 11.73 pounds
4 419 Gs
0.80 kg / 1.76 pounds
798 g / 7.8 N
4.79 kg / 10.55 pounds
~0 Gs
2 mm 4.80 kg / 10.57 pounds
4 196 Gs
0.72 kg / 1.59 pounds
719 g / 7.1 N
4.32 kg / 9.52 pounds
~0 Gs
3 mm 4.25 kg / 9.36 pounds
3 948 Gs
0.64 kg / 1.40 pounds
637 g / 6.2 N
3.82 kg / 8.42 pounds
~0 Gs
5 mm 3.17 kg / 6.99 pounds
3 412 Gs
0.48 kg / 1.05 pounds
476 g / 4.7 N
2.85 kg / 6.29 pounds
~0 Gs
10 mm 1.28 kg / 2.82 pounds
2 168 Gs
0.19 kg / 0.42 pounds
192 g / 1.9 N
1.15 kg / 2.54 pounds
~0 Gs
20 mm 0.18 kg / 0.40 pounds
821 Gs
0.03 kg / 0.06 pounds
28 g / 0.3 N
0.17 kg / 0.36 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
101 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
62 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
41 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
28 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
20 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
15 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - warnings
MW 15x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - warning
MW 15x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.62 km/h
(7.67 m/s)
0.12 J
30 mm 46.91 km/h
(13.03 m/s)
0.34 J
50 mm 60.56 km/h
(16.82 m/s)
0.56 J
100 mm 85.64 km/h
(23.79 m/s)
1.13 J

Table 9: Anti-corrosion coating durability
MW 15x3 / 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 (Pc)
MW 15x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 718 Mx 47.2 µWb
Pc Coefficient 0.29 Low (Flat)

Table 11: Submerged application
MW 15x3 / N38

Environment Effective steel pull Effect
Air (land) 2.87 kg Standard
Water (riverbed) 3.29 kg
(+0.42 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.
1. Shear force

*Note: On a vertical surface, the magnet holds just approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.29

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
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%
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: 010029-2026
Measurement Calculator
Pulling force

Magnetic Field

Check out also offers

This product is a very strong cylinder magnet, manufactured from durable NdFeB material, which, at dimensions of Ø15x3 mm, guarantees the highest energy density. The MW 15x3 / N38 model boasts high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 2.87 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard 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 28.14 N with a weight of only 3.98 g, this rod is indispensable in electronics 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 long-term durability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø15x3), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 15 mm and height 3 mm. The key parameter here is the lifting capacity amounting to approximately 2.87 kg (force ~28.14 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 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 15 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 rare earth magnets.

Pros

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
  • They do not lose their magnetic properties even under close interference source,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Neodymium magnets achieve maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to freedom in shaping and the ability to modify to unusual requirements,
  • Wide application in future technologies – they are commonly used in mass storage devices, motor assemblies, medical devices, and multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as 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
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex forms.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

Breakaway force is the result of a measurement for ideal contact conditions, assuming:
  • on a plate made of mild steel, effectively closing the magnetic flux
  • possessing a thickness of at least 10 mm to avoid saturation
  • with an ideally smooth touching surface
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction vertical to the plane
  • at ambient temperature room level

Practical aspects of lifting capacity – factors

In practice, the actual lifting capacity depends on a number of factors, presented from crucial:
  • Distance (betwixt the magnet and the plate), as 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 paint, corrosion or dirt).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Plate material – mild steel gives the best results. Higher carbon content reduce magnetic properties and holding force.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet and the plate decreases the load capacity.

Warnings
Medical implants

Warning for patients: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or ask another person to handle the magnets.

Permanent damage

Do not overheat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Allergic reactions

Certain individuals experience a sensitization to nickel, which is the typical protective layer for neodymium magnets. Frequent touching may cause a rash. We strongly advise wear safety gloves.

Physical harm

Protect your hands. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Machining danger

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

Protective goggles

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Do not give to children

Neodymium magnets are not suitable for play. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and necessitates urgent medical intervention.

Keep away from computers

Intense magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

GPS Danger

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

Powerful field

Exercise caution. Rare earth magnets attract from a long distance and connect with huge force, often faster than you can react.

Danger! Want to know more? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98