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neodymium magnets

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Dhit sp. z o.o.
Nazwa: MW 15x4 / N38
Kategoria ID: 1
Wymiary znalezione w atrybutach:
D: 15, H: 4, Do: 0, Di: 0
Nazwa: MW 15x4 / N38
Kategoria ID: 1
Wymiary znalezione w atrybutach:
D: 15, H: 4, Do: 0, Di: 0
Product available Ships in 3 days

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

3.16 kg / 30.99 N

Magnetic Induction

291.60 mT

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 ~ ? 3.16 kg / 30.99 N
Magnetic Induction ~ ? 291.60 mT
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

Magnet Performance Analysis

Results are based on physical models for sintered magnets. Real-world results may differ from the simulation.

Table 1: Pull Force vs Distance Function
MW 15x4 / N38
Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 2915 Gs
291.5 mT
2.85 kg / 2846.4 g
27.9 N
Medium
1 mm 2620 Gs
262.0 mT
2.30 kg / 2298.9 g
22.6 N
Medium
2 mm 2276 Gs
227.6 mT
1.73 kg / 1734.6 g
17.0 N
Safe
5 mm 1324 Gs
132.4 mT
0.59 kg / 587.0 g
5.8 N
Safe
10 mm 505 Gs
50.5 mT
0.09 kg / 85.5 g
0.8 N
Safe
15 mm 222 Gs
22.2 mT
0.02 kg / 16.4 g
0.2 N
Safe
20 mm 113 Gs
11.3 mT
0.00 kg / 4.2 g
0.0 N
Safe
30 mm 40 Gs
4.0 mT
0.00 kg / 0.5 g
0.0 N
Safe
50 mm 10 Gs
1.0 mT
0.00 kg / 0.0 g
0.0 N
Safe
Table 2: Shear Force (Wall Mount)
MW 15x4 / N38
Surface Type Friction Coeff. / % Mocy Max Load (kg)
Raw Steel
µ = 0.3 30% Nominalnej Siły
0.85 kg / 853.9 g
8.4 N
Painted Steel (Standard)
µ = 0.2 20% Nominalnej Siły
0.57 kg / 569.3 g
5.6 N
Greasy/Slippery Steel
µ = 0.1 10% Nominalnej Siły
0.28 kg / 284.6 g
2.8 N
Magnet with Anti-slip Rubber
µ = 0.5 50% Nominalnej Siły
1.42 kg / 1423.2 g
14.0 N
Table 3: Power Loss on Thin Sheets
MW 15x4 / N38
Steel Thickness (mm) % Efficiency Real Pull Force (kg)
0.5 mm
10%
0.28 kg / 284.6 g
2.8 N
1 mm
25%
0.71 kg / 711.6 g
7.0 N
2 mm
50%
1.42 kg / 1423.2 g
14.0 N
5 mm
100%
2.85 kg / 2846.4 g
27.9 N
10 mm
100%
2.85 kg / 2846.4 g
27.9 N
Table 4: Thermal Stability of the Magnet
MW 15x4 / N38
Ambient Temp. (°C) Power Loss Remaining Pull Status
20 °C 0.0% 2.85 kg / 2846.4 g
27.9 N
OK
40 °C -2.2% 2.78 kg / 2783.8 g
27.3 N
OK
60 °C -4.4% 2.72 kg / 2721.2 g
26.7 N
OK
80 °C -6.6% 2.66 kg / 2658.6 g
26.1 N
100 °C -28.8% 2.03 kg / 2026.7 g
19.9 N
Table 5: Magnetic Coupling (N-S and N-N)
MW 15x4 / N38
Air Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 4.28 kg / 4275.0 g
41.9 N
N/A
2 mm 2.59 kg / 2595.0 g
25.5 N
2.42 kg / 2422.0 g
23.8 N
5 mm 0.89 kg / 885.0 g
8.7 N
0.83 kg / 826.0 g
8.1 N
10 mm 0.14 kg / 135.0 g
1.3 N
0.13 kg / 126.0 g
1.2 N
20 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
50 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
Table 6: Device & Health Protection
MW 15x4 / N38
Object / Device Limit (Gauss) / mT Safe Distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing Aid / Implant 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
Credit Card 400 Gs (40.0 mT) 1.5 cm
Hard Drive (HDD) 600 Gs (60.0 mT) 1.0 cm
Table 7: Speed and Kinetic Energy
MW 15x4 / N38
Start from (mm) Speed (km/h) Energy (J) Predicted Effect
10 mm 23.80 km/h
(6.61 m/s)
0.12 J
30 mm 40.48 km/h
(11.24 m/s)
0.34 J
50 mm 52.25 km/h
(14.52 m/s)
0.56 J
100 mm 73.90 km/h
(20.53 m/s)
1.12 J
Table 8: Surface Protection Specs
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 9: Physics of Underwater Search
MW 15x4 / N38
Environment Effective Steel Capacity Effect
Air (Land) 2.85 kg Standard
Water (River bed) 3.26 kg
(+0.41 kg Buoyancy Bonus)
+14.5%
Corrosion Warning: This magnet has a standard Nickel coating. After use in water, dry it immediately and preserve it, otherwise it will rust!

View also offers

This product is an extremely powerful cylindrical magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø15x4 mm, guarantees optimal power. This specific item boasts a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 3.16 kg), this product is in stock from our warehouse in Poland, 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 created for building generators, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 30.99 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 best method is to glue them into holes with a slightly larger diameter (e.g., 15.1 mm) using two-component epoxy glues. To ensure stability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are suitable for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. 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 available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 15 mm and height 4 mm. The key parameter here is the holding force amounting to approximately 3.16 kg (force ~30.99 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it 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 standard 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 NdFeB magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

  • Their strength remains stable, and after around 10 years it decreases only by ~1% (theoretically),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • A magnet with a metallic nickel surface is more attractive,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Thanks to the option of free molding and adaptation to specialized requirements, neodymium magnets can be created in a wide range of geometric configurations, which makes them more universal,
  • Key role in modern industrial fields – they serve a role in hard drives, electric drive systems, medical devices, and complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Limited possibility of making nuts in the magnet and complicated shapes - preferred is a housing - magnet mounting.
  • Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Maximum lifting capacity of the magnetwhat contributes to it?

The lifting capacity listed is a result of laboratory testing performed under standard conditions:

  • on a plate made of mild steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with an polished contact surface
  • with zero gap (without paint)
  • for force acting at a right angle (pull-off, not shear)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

In practice, the real power results from many variables, ranked from the most important:

  • Distance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Surface finish – full contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets

Do not drill into magnets

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

Protective goggles

Neodymium magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets will cause them breaking into small pieces.

Electronic hazard

Equipment safety: Strong magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).

Metal Allergy

Certain individuals suffer from a sensitization to nickel, which is the standard coating for neodymium magnets. Extended handling may cause skin redness. We strongly advise use safety gloves.

GPS and phone interference

GPS units and smartphones are highly sensitive to magnetism. Close proximity with a strong magnet can ruin the internal compass in your phone.

Handling rules

Handle magnets with awareness. Their powerful strength can surprise even professionals. Be vigilant and respect their power.

Life threat

For implant holders: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or request help to work with the magnets.

Product not for children

Absolutely store magnets away from children. Risk of swallowing is high, and the effects of magnets connecting inside the body are tragic.

Pinching danger

Pinching hazard: The pulling power is so great that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Demagnetization risk

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

Safety First!

Want to know more? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98