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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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Technical details - 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 analysis of the magnet - technical parameters

Presented data represent the result of a mathematical analysis. Values are based on models for the material Nd2Fe14B. Actual conditions might slightly differ. Use these data as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
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 LBS
2870.0 g / 28.2 N
warning
1 mm 2098 Gs
209.8 mT
2.39 kg / 5.26 LBS
2386.5 g / 23.4 N
warning
2 mm 1842 Gs
184.2 mT
1.84 kg / 4.05 LBS
1838.5 g / 18.0 N
weak grip
3 mm 1570 Gs
157.0 mT
1.34 kg / 2.95 LBS
1337.0 g / 13.1 N
weak grip
5 mm 1084 Gs
108.4 mT
0.64 kg / 1.40 LBS
637.0 g / 6.2 N
weak grip
10 mm 410 Gs
41.0 mT
0.09 kg / 0.20 LBS
91.3 g / 0.9 N
weak grip
15 mm 178 Gs
17.8 mT
0.02 kg / 0.04 LBS
17.1 g / 0.2 N
weak grip
20 mm 89 Gs
8.9 mT
0.00 kg / 0.01 LBS
4.3 g / 0.0 N
weak grip
30 mm 31 Gs
3.1 mT
0.00 kg / 0.00 LBS
0.5 g / 0.0 N
weak grip
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip

Table 2: Slippage capacity (vertical surface)
MW 15x3 / N38

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

Table 3: Wall mounting (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 LBS
861.0 g / 8.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.57 kg / 1.27 LBS
574.0 g / 5.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.29 kg / 0.63 LBS
287.0 g / 2.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.44 kg / 3.16 LBS
1435.0 g / 14.1 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 15x3 / N38

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

Table 5: Thermal resistance (material behavior) - resistance threshold
MW 15x3 / N38

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

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 15x3 / N38

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

Table 7: Protective zones (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
Mobile device 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: Dynamics (kinetic energy) - collision effects
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: Construction 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%
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

*Caution: On a vertical surface, the magnet holds just ~20% of its perpendicular strength.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely limits 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

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
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%
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
Quick Unit Converter
Pulling force

Magnetic Field

Check out also products

This product is a very strong rod magnet, made from modern NdFeB material, which, at dimensions of Ø15x3 mm, guarantees optimal power. The MW 15x3 / N38 model features high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 2.87 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 28.14 N with a weight of only 3.98 g, this cylindrical magnet is indispensable in electronics 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., 15.1 mm) using epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel 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 (Ø15x3), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf 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.
This rod magnet is magnetized axially (along the height of 3 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 through the diameter if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even during nearly ten years – the drop in lifting capacity is only ~1% (theoretically),
  • They show high resistance to demagnetization induced by external magnetic fields,
  • By applying a shiny coating of nickel, the element acquires an proper look,
  • Magnetic induction on the top side of the magnet turns out to be impressive,
  • 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...
  • Possibility of individual creating and modifying to complex requirements,
  • Fundamental importance in future technologies – they serve a role in magnetic memories, motor assemblies, diagnostic systems, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in small systems

Weaknesses

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing threads and complex shapes in magnets, we propose using a housing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Highest magnetic holding forcewhat affects it?

Breakaway force was determined for ideal contact conditions, assuming:
  • with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • with a thickness of at least 10 mm
  • with a plane cleaned and smooth
  • under conditions of gap-free contact (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at room temperature

What influences lifting capacity in practice

In practice, the actual holding force results from many variables, ranked from most significant:
  • Gap between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the power to be lost into the air.
  • Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets
Permanent damage

Control the heat. Exposing the magnet to high heat will permanently weaken its magnetic structure and pulling force.

ICD Warning

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Swallowing risk

Neodymium magnets are not toys. Swallowing multiple magnets can lead to them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

Magnet fragility

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

Impact on smartphones

An intense magnetic field interferes with the functioning of magnetometers in phones and GPS navigation. Do not bring magnets near a device to avoid damaging the sensors.

Bodily injuries

Protect your hands. Two large magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Caution required

Handle magnets consciously. Their huge power can shock even professionals. Stay alert and respect their force.

Fire risk

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Allergic reactions

Some people experience a sensitization to nickel, which is the standard coating for neodymium magnets. Prolonged contact can result in an allergic reaction. It is best to wear safety gloves.

Electronic devices

Powerful magnetic fields can destroy records on payment cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Important! Looking for details? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98