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MW 15x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010030

GTIN: 5906301810292

5.00

Diameter Ø

15 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

5.3 g

Magnetization Direction

↑ axial

Load capacity

4.22 kg / 41.38 N

Magnetic Induction

291.60 mT / 2916 Gs

Coating

[NiCuNi] Nickel

1.968 with VAT / pcs + price for transport

1.600 ZŁ net + 23% VAT / pcs

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MW 15x4 / N38 - cylindrical magnet

Specification / characteristics MW 15x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010030
GTIN 5906301810292
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 4 mm [±0,1 mm]
Weight 5.3 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.22 kg / 41.38 N
Magnetic Induction ~ ? 291.60 mT / 2916 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 15x4 / N38 - cylindrical magnet
properties values units
remenance Br [Min. - Max.] ? 12.2-12.6 kGs
remenance Br [Min. - Max.] ? 1220-1260 T
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 106 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Engineering simulation of the product - data

These values constitute the outcome of a mathematical calculation. Values rely on models for the class Nd2Fe14B. Actual performance may differ. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
MW 15x4 / N38
Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 2915 Gs
291.5 mT
4.22 kg / 4220.0 g
41.4 N
warning
1 mm 2620 Gs
262.0 mT
3.41 kg / 3408.2 g
33.4 N
warning
2 mm 2276 Gs
227.6 mT
2.57 kg / 2571.6 g
25.2 N
warning
3 mm 1928 Gs
192.8 mT
1.85 kg / 1845.5 g
18.1 N
safe
5 mm 1324 Gs
132.4 mT
0.87 kg / 870.3 g
8.5 N
safe
10 mm 505 Gs
50.5 mT
0.13 kg / 126.7 g
1.2 N
safe
15 mm 222 Gs
22.2 mT
0.02 kg / 24.4 g
0.2 N
safe
20 mm 113 Gs
11.3 mT
0.01 kg / 6.3 g
0.1 N
safe
30 mm 40 Gs
4.0 mT
0.00 kg / 0.8 g
0.0 N
safe
50 mm 10 Gs
1.0 mT
0.00 kg / 0.0 g
0.0 N
safe
Table 2: Sliding Hold (Wall)
MW 15x4 / N38
Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 0.84 kg / 844.0 g
8.3 N
1 mm Stal (~0.2) 0.68 kg / 682.0 g
6.7 N
2 mm Stal (~0.2) 0.51 kg / 514.0 g
5.0 N
3 mm Stal (~0.2) 0.37 kg / 370.0 g
3.6 N
5 mm Stal (~0.2) 0.17 kg / 174.0 g
1.7 N
10 mm Stal (~0.2) 0.03 kg / 26.0 g
0.3 N
15 mm Stal (~0.2) 0.00 kg / 4.0 g
0.0 N
20 mm Stal (~0.2) 0.00 kg / 2.0 g
0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
Table 3: Wall mounting (shearing) - vertical pull
MW 15x4 / N38
Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.27 kg / 1266.0 g
12.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.84 kg / 844.0 g
8.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.42 kg / 422.0 g
4.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.11 kg / 2110.0 g
20.7 N
Table 4: Steel thickness (saturation) - power losses
MW 15x4 / N38
Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.42 kg / 422.0 g
4.1 N
1 mm
25%
1.06 kg / 1055.0 g
10.3 N
2 mm
50%
2.11 kg / 2110.0 g
20.7 N
5 mm
100%
4.22 kg / 4220.0 g
41.4 N
10 mm
100%
4.22 kg / 4220.0 g
41.4 N
Table 5: Thermal resistance (material behavior) - resistance threshold
MW 15x4 / N38
Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 4.22 kg / 4220.0 g
41.4 N
OK
40 °C -2.2% 4.13 kg / 4127.2 g
40.5 N
OK
60 °C -4.4% 4.03 kg / 4034.3 g
39.6 N
80 °C -6.6% 3.94 kg / 3941.5 g
38.7 N
100 °C -28.8% 3.00 kg / 3004.6 g
29.5 N
Table 6: Two magnets (repulsion) - forces in the system
MW 15x4 / N38
Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 9.26 kg / 9258 g
90.8 N
4 518 Gs
N/A
1 mm 8.40 kg / 8404 g
82.4 N
5 555 Gs
7.56 kg / 7564 g
74.2 N
~0 Gs
2 mm 7.48 kg / 7477 g
73.3 N
5 239 Gs
6.73 kg / 6729 g
66.0 N
~0 Gs
3 mm 6.54 kg / 6542 g
64.2 N
4 901 Gs
5.89 kg / 5888 g
57.8 N
~0 Gs
5 mm 4.80 kg / 4804 g
47.1 N
4 200 Gs
4.32 kg / 4324 g
42.4 N
~0 Gs
10 mm 1.91 kg / 1909 g
18.7 N
2 648 Gs
1.72 kg / 1718 g
16.9 N
~0 Gs
20 mm 0.28 kg / 278 g
2.7 N
1 010 Gs
0.25 kg / 250 g
2.5 N
~0 Gs
50 mm 0.00 kg / 4 g
0.0 N
128 Gs
0.00 kg / 0 g
0.0 N
~0 Gs
Table 7: Protective zones (electronics) - warnings
MW 15x4 / N38
Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 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
Car key 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: Collisions (kinetic energy) - warning
MW 15x4 / N38
Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.99 km/h
(8.05 m/s)
0.17 J
30 mm 49.30 km/h
(13.69 m/s)
0.50 J
50 mm 63.63 km/h
(17.68 m/s)
0.83 J
100 mm 89.99 km/h
(25.00 m/s)
1.66 J
Table 9: Anti-corrosion coating durability
MW 15x4 / 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: Generator data (Flux)
MW 15x4 / N38
Parameter Value Jedn. SI / Opis
Strumień (Flux) 5 659 Mx 56.6 µWb
Współczynnik Pc 0.37 Niski (Płaski)
Table 11: Physics of underwater searching
MW 15x4 / N38
Environment Effective steel pull Effect
Air (land) 4.22 kg Standard
Water (riverbed) 4.83 kg
(+0.61 kg Buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely weakens the holding force.

3. Heat tolerance

*For standard magnets, the critical limit is 80°C.

Quick Unit Converter
Pulling Force

Field Strength

Other products

The presented product is an extremely powerful rod magnet, composed of modern NdFeB material, which, with dimensions of Ø15x4 mm, guarantees maximum efficiency. The MW 15x4 / N38 component is characterized by a tolerance of ±0.1mm and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 4.22 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 41.38 N with a weight of only 5.3 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 15.1 mm) using two-component epoxy glues. To ensure long-term durability 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 popular standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø15x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 15 mm and height 4 mm. The value of 41.38 N means that the magnet is capable of holding a weight many times exceeding its own mass of 5.3 g. 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. 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.

Advantages
Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even over approximately 10 years – the drop in lifting capacity is only ~1% (based on measurements),
  • Magnets perfectly defend themselves against loss of magnetization caused by ambient magnetic noise,
  • A magnet with a smooth nickel surface has better aesthetics,
  • Magnetic induction on the surface of the magnet turns out to be extremely intense,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Thanks to versatility in designing and the capacity to adapt to individual projects,
  • Universal use in electronics industry – they find application in mass storage devices, electromotive mechanisms, medical devices, as well as industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications
Weaknesses
Cons of neodymium magnets and ways of using them
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and 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 those in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these products can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Maximum holding power of the magnet – what it depends on?
The specified lifting capacity refers to the peak performance, measured under ideal test conditions, specifically:
  • using a base made of high-permeability steel, serving as a circuit closing element
  • with a thickness of at least 10 mm
  • with an ideally smooth touching surface
  • with total lack of distance (without impurities)
  • under perpendicular force vector (90-degree angle)
  • in stable room temperature
Key elements affecting lifting force
Holding efficiency impacted by working environment parameters, including (from priority):
  • Clearance – the presence of foreign body (rust, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Surface structure – the more even the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the load capacity is reduced by as much as 5 times. In addition, even a small distance between the magnet and the plate decreases the load capacity.

Safe handling of NdFeB magnets
Choking Hazard

These products are not toys. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.

Permanent damage

Monitor thermal conditions. Heating the magnet to high heat will destroy its magnetic structure and strength.

Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Powerful field

Handle magnets with awareness. Their powerful strength can surprise even experienced users. Plan your moves and respect their force.

Combustion hazard

Dust generated during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Threat to navigation

Note: neodymium magnets generate a field that confuses sensitive sensors. Keep a separation from your mobile, device, and GPS.

Warning for heart patients

Health Alert: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Hand protection

Watch your fingers. Two powerful magnets will join immediately with a force of massive weight, destroying anything in their path. Be careful!

Electronic devices

Very strong magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Material brittleness

Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98