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neodymium magnets

We offer red color magnets Nd2Fe14B - our offer. Practically all "neodymium magnets" in our store are in stock for immediate purchase (see the list). See the magnet pricing for more details check the magnet price list

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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

4.12 kg / 40.39 N

Magnetic Induction

291.60 mT

Coating

[NiCuNi] Nickel

1.968 with VAT / pcs + price for transport

1.600 ZŁ net + 23% VAT / pcs

bulk discounts:

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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 ~ ? 4.12 kg / 40.39 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

Engineering modeling of the assembly - data

Presented information represent the direct effect of a physical analysis. Values rely on algorithms for the material NdFeB. Real-world performance may differ. Treat these calculations as a reference point for designers.

Table 1: Static force (force vs distance) - interaction chart
MW 15x4 / N38
Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 2915 Gs
291.5 mT
4.12 kg / 4120.0 g
40.4 N
warning
1 mm 2620 Gs
262.0 mT
3.33 kg / 3327.5 g
32.6 N
warning
2 mm 2276 Gs
227.6 mT
2.51 kg / 2510.7 g
24.6 N
warning
5 mm 1324 Gs
132.4 mT
0.85 kg / 849.7 g
8.3 N
low risk
10 mm 505 Gs
50.5 mT
0.12 kg / 123.7 g
1.2 N
low risk
15 mm 222 Gs
22.2 mT
0.02 kg / 23.8 g
0.2 N
low risk
20 mm 113 Gs
11.3 mT
0.01 kg / 6.1 g
0.1 N
low risk
30 mm 40 Gs
4.0 mT
0.00 kg / 0.8 g
0.0 N
low risk
50 mm 10 Gs
1.0 mT
0.00 kg / 0.0 g
0.0 N
low risk
Table 2: Wall mounting (sliding) - behavior on slippery surfaces
MW 15x4 / N38
Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.24 kg / 1236.0 g
12.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.82 kg / 824.0 g
8.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.41 kg / 412.0 g
4.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.06 kg / 2060.0 g
20.2 N
Table 3: Material efficiency (substrate influence) - sheet metal selection
MW 15x4 / N38
Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.41 kg / 412.0 g
4.0 N
1 mm
25%
1.03 kg / 1030.0 g
10.1 N
2 mm
50%
2.06 kg / 2060.0 g
20.2 N
5 mm
100%
4.12 kg / 4120.0 g
40.4 N
10 mm
100%
4.12 kg / 4120.0 g
40.4 N
Table 4: Thermal stability (stability) - thermal limit
MW 15x4 / N38
Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 4.12 kg / 4120.0 g
40.4 N
OK
40 °C -2.2% 4.03 kg / 4029.4 g
39.5 N
OK
60 °C -4.4% 3.94 kg / 3938.7 g
38.6 N
OK
80 °C -6.6% 3.85 kg / 3848.1 g
37.7 N
100 °C -28.8% 2.93 kg / 2933.4 g
28.8 N
Table 5: Magnet-Magnet interaction (repulsion) - field range
MW 15x4 / N38
Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 6.18 kg / 6180.0 g
60.6 N
N/A
2 mm 3.76 kg / 3765.0 g
36.9 N
3.51 kg / 3514.0 g
34.5 N
5 mm 1.28 kg / 1275.0 g
12.5 N
1.19 kg / 1190.0 g
11.7 N
10 mm 0.18 kg / 180.0 g
1.8 N
0.17 kg / 168.0 g
1.6 N
20 mm 0.02 kg / 15.0 g
0.1 N
0.01 kg / 14.0 g
0.1 N
50 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
Table 6: 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
Timepiece 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 7: Impact energy (cracking risk) - collision effects
MW 15x4 / N38
Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.64 km/h
(7.96 m/s)
0.17 J
30 mm 48.71 km/h
(13.53 m/s)
0.49 J
50 mm 62.88 km/h
(17.47 m/s)
0.81 J
100 mm 88.92 km/h
(24.70 m/s)
1.62 J
Table 8: Coating parameters (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 9: Physics of underwater searching
MW 15x4 / N38
Environment Effective steel pull Effect
Air (land) 4.12 kg Standard
Water (riverbed) 4.72 kg
(+0.60 kg Buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Other products

This product is a very strong cylinder magnet, composed of modern NdFeB material, which, at dimensions of Ø15x4 mm, guarantees optimal power. The MW 15x4 / N38 model boasts a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 4.12 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 40.39 N with a weight of only 5.3 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger 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 key parameter here is the holding force amounting to approximately 4.12 kg (force ~40.39 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.
This rod magnet is magnetized axially (along the height of 4 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 diametrically if your project requires it.

Strengths and weaknesses of neodymium magnets.

Besides their durability, neodymium magnets are valued for these benefits:

  • Their power is maintained, and after around 10 years it decreases only by ~1% (theoretically),
  • They feature excellent resistance to magnetic field loss as a result of external magnetic sources,
  • Thanks to the shiny finish, the plating of nickel, gold, or silver-plated gives an modern appearance,
  • Magnets have maximum magnetic induction on the active area,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of precise shaping and adapting to individual requirements,
  • Versatile presence in innovative solutions – they find application in magnetic memories, electromotive mechanisms, advanced medical instruments, as well as industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and 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
  • 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 and corrosion.
  • Due to limitations in creating nuts and complex shapes in magnets, we propose using cover - magnetic holder.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum holding power of the magnet – what affects it?

The specified lifting capacity represents the limit force, measured under optimal environment, specifically:

  • on a block made of mild steel, effectively closing the magnetic flux
  • with a thickness of at least 10 mm
  • with an ground touching surface
  • under conditions of no distance (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • at standard ambient temperature

Determinants of lifting force in real conditions

Real force impacted by working environment parameters, such as (from most important):

  • Distance (betwixt the magnet and the plate), because even a very small distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Direction of force – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Plate material – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

* Lifting capacity was assessed with the use of a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet’s surface and the plate lowers the holding force.

Warnings

Sensitization to coating

Studies show that nickel (standard magnet coating) is a strong allergen. If you have an allergy, refrain from direct skin contact and opt for encased magnets.

Threat to electronics

Data protection: Strong magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Heat warning

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Compass and GPS

A powerful magnetic field interferes with the functioning of compasses in smartphones and navigation systems. Keep magnets close to a smartphone to avoid damaging the sensors.

Fire warning

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Danger to pacemakers

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.

Bone fractures

Risk of injury: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Immense force

Before starting, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Danger to the youngest

Absolutely keep magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are very dangerous.

Fragile material

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Attention!

More info about hazards in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98