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MW 15x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010032

GTIN/EAN: 5906301810315

5.00

Diameter Ø

15 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

10.6 g

Magnetization Direction

↑ axial

Load capacity

7.37 kg / 72.28 N

Magnetic Induction

451.96 mT / 4520 Gs

Coating

[NiCuNi] Nickel

see technical specifications »

4.92 ZŁ with VAT / pcs + price for transport

4.00 ZŁ net + 23% VAT / pcs

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Weight along with structure of a neodymium magnet can be analyzed using our modular calculator.

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Detailed specification - MW 15x8 / N38 - cylindrical magnet

Specification / characteristics - MW 15x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010032
GTIN/EAN 5906301810315
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 8 mm [±0,1 mm]
Weight 10.6 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.37 kg / 72.28 N
Magnetic Induction ~ ? 451.96 mT / 4520 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 15x8 / 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 modeling of the assembly - technical parameters

The following values represent the result of a physical calculation. Values were calculated on models for the material Nd2Fe14B. Actual performance may differ. Use these data as a reference point during assembly planning.

Table 1: Static force (pull vs distance) - power drop
MW 15x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4518 Gs
451.8 mT
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
 medium risk
1 mm 3944 Gs
394.4 mT
 5.62 kg / 12.38 pounds
5616.2 g / 55.1 N
 medium risk
2 mm 3362 Gs
336.2 mT
 4.08 kg / 9.00 pounds
4083.1 g / 40.1 N
 medium risk
3 mm 2820 Gs
282.0 mT
 2.87 kg / 6.33 pounds
2871.9 g / 28.2 N
 medium risk
5 mm 1931 Gs
193.1 mT
 1.35 kg / 2.97 pounds
1346.9 g / 13.2 N
 safe
10 mm 763 Gs
76.3 mT
 0.21 kg / 0.46 pounds
210.3 g / 2.1 N
 safe
15 mm 349 Gs
34.9 mT
 0.04 kg / 0.10 pounds
44.0 g / 0.4 N
 safe
20 mm 184 Gs
18.4 mT
 0.01 kg / 0.03 pounds
12.2 g / 0.1 N
 safe
30 mm 68 Gs
6.8 mT
 0.00 kg / 0.00 pounds
1.7 g / 0.0 N
 safe
50 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 safe
Grip strength weakens drastically with every subsequent millimeter of gap. Keep in mind that even a very thin break (e.g., contamination, paint, veneer) significantly diminishes the holding power. Magnetic products work strongest in perfect adhesion; gap kills the power. Notice how quickly the parameters plummet, when the magnet does not adhere flatly to the metal substrate. When planning the mounting, eliminate additional spacers.

Table 2: Vertical force (wall)
MW 15x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.47 kg / 3.25 pounds
1474.0 g / 14.5 N
1 mm Stal (~0.2) 1.12 kg / 2.48 pounds
1124.0 g / 11.0 N
2 mm Stal (~0.2) 0.82 kg / 1.80 pounds
816.0 g / 8.0 N
3 mm Stal (~0.2) 0.57 kg / 1.27 pounds
574.0 g / 5.6 N
5 mm Stal (~0.2) 0.27 kg / 0.60 pounds
270.0 g / 2.6 N
10 mm Stal (~0.2) 0.04 kg / 0.09 pounds
42.0 g / 0.4 N
15 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 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
The table below shows the theoretical force necessary to cause the slippage of the magnet vertically against a vertical steel plate (considering typical friction coefficient). The holding force depends on the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 15x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.21 kg / 4.87 pounds
2211.0 g / 21.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.47 kg / 3.25 pounds
1474.0 g / 14.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.74 kg / 1.62 pounds
737.0 g / 7.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.69 kg / 8.12 pounds
3685.0 g / 36.1 N
When mounting a magnet on a vertical plane (e.g., a board), it you can count on only about 20%-30% of nominal attraction strength. Gravity and a weak degree of grip mean that holders move down easier than they detach. Want to create a wall mount? Note that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the magnet will give way down under a much lighter weight. Utilizing a rubberized coating can significantly improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 15x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.74 kg / 1.62 pounds
737.0 g / 7.2 N
1 mm
25%
 1.84 kg / 4.06 pounds
1842.5 g / 18.1 N
2 mm
50%
 3.69 kg / 8.12 pounds
3685.0 g / 36.1 N
3 mm
75%
 5.53 kg / 12.19 pounds
5527.5 g / 54.2 N
5 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
10 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
11 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
12 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
A thin metal plate is unable to conduct the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a weak sheet, the magnetism will pass right through and the holding will be smaller. To squeeze 100% of this neodymium's potential, you need a suitably thick element of metal. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the product holds weaker. We suggest choosing the steel cross-section according to the table below.

Table 5: Thermal stability (material behavior) - power drop
MW 15x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
 OK
40 °C -2.2% 7.21 kg / 15.89 pounds
7207.9 g / 70.7 N
 OK
60 °C -4.4% 7.05 kg / 15.53 pounds
7045.7 g / 69.1 N
 OK
80 °C -6.6% 6.88 kg / 15.18 pounds
6883.6 g / 67.5 N
100 °C -28.8% 5.25 kg / 11.57 pounds
5247.4 g / 51.5 N
Classic neodymiums change their properties power after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently damage this magnet. With increasing heat, the magnet's power temporarily decreases. Do not use this product in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low Pc) are more susceptible to demagnetization sooner than long magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MW 15x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 22.23 kg / 49.02 pounds
5 606 Gs
3.34 kg / 7.35 pounds
3335 g / 32.7 N
 N/A
1 mm 19.55 kg / 43.11 pounds
8 473 Gs
2.93 kg / 6.47 pounds
2933 g / 28.8 N
 17.60 kg / 38.80 pounds
~0 Gs
2 mm 16.94 kg / 37.35 pounds
7 887 Gs
2.54 kg / 5.60 pounds
2541 g / 24.9 N
 15.25 kg / 33.62 pounds
~0 Gs
3 mm 14.52 kg / 32.00 pounds
7 301 Gs
2.18 kg / 4.80 pounds
2178 g / 21.4 N
 13.07 kg / 28.80 pounds
~0 Gs
5 mm 10.37 kg / 22.85 pounds
6 169 Gs
1.55 kg / 3.43 pounds
1555 g / 15.3 N
 9.33 kg / 20.57 pounds
~0 Gs
10 mm 4.06 kg / 8.96 pounds
3 862 Gs
0.61 kg / 1.34 pounds
609 g / 6.0 N
 3.66 kg / 8.06 pounds
~0 Gs
20 mm 0.63 kg / 1.40 pounds
1 526 Gs
0.10 kg / 0.21 pounds
95 g / 0.9 N
 0.57 kg / 1.26 pounds
~0 Gs
50 mm 0.01 kg / 0.03 pounds
215 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
60 mm 0.01 kg / 0.01 pounds
136 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
91 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
64 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
46 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
35 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a significantly greater distance than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of operation. Want to build a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The levitation is marginally weaker than the connection force, but still significant.
*The magnetic induction between like poles drops to ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
* Figures apply to sliding force of two matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 15x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.0 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field is a serious hazard to IT equipment and medical implants. These NdFeB products produce a flux that disrupts operation of digital equipment. Notice: the unseen radiation penetrates the body and plastic. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
MW 15x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.06 km/h
(7.52 m/s)
 0.30 J
30 mm 46.07 km/h
(12.80 m/s)
 0.87 J
50 mm 59.46 km/h
(16.52 m/s)
 1.45 J
100 mm 84.09 km/h
(23.36 m/s)
 2.89 J
NdFeB products are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can destroy the magnet or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Coating parameters (durability)
MW 15x8 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 15x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 8 074 Mx 80.7 µWb
Pc Coefficient 0.61 High (Stable)
Total magnetic flux passing through the magnet pole. Key data in coil applications and motors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 15x8 / N38

Environment Effective steel pull Effect
Air (land) 7.37 kg Standard
Water (riverbed) 8.44 kg
(+1.07 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!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Note: On a vertical wall, the magnet holds merely a fraction of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. computer case) significantly limits the holding force.

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.61

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
Material specification
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%
Sustainability
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: 010032-2026
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The offered product is an exceptionally strong cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø15x8 mm, guarantees the highest energy density. The MW 15x8 / N38 model features a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 7.37 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 72.28 N with a weight of only 10.6 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in automation, specialized industrial adhesives 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 strong enough for the majority of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø15x8), 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 8 mm. The value of 72.28 N means that the magnet is capable of holding a weight many times exceeding its own mass of 10.6 g. 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. 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.

Pros and cons of neodymium magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They do not lose strength, even during approximately 10 years – the decrease in lifting capacity is only ~1% (according to tests),
  • They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • By covering with a shiny coating of gold, the element presents an elegant look,
  • Magnets possess extremely high magnetic induction on the active area,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of accurate modeling and optimizing to concrete applications,
  • Significant place in high-tech industry – they serve a role in mass storage devices, electric motors, advanced medical instruments, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in small systems

Cons

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • Neodymium magnets decrease 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
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these products can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what it depends on?

The lifting capacity listed is a result of laboratory testing executed under specific, ideal conditions:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • with a cross-section minimum 10 mm
  • characterized by lack of roughness
  • with direct contact (without impurities)
  • under axial application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Determinants of lifting force in real conditions

In practice, the real power depends on a number of factors, ranked from the most important:
  • Distance – existence of foreign body (paint, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Base massiveness – insufficiently thick steel does not accept the full field, causing part of the flux to be escaped to the other side.
  • Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the lifting capacity is smaller. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Safe handling of NdFeB magnets
Immense force

Handle magnets consciously. Their huge power can shock even experienced users. Stay alert and do not underestimate their power.

Machining danger

Fire warning: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

Do not overheat magnets

Avoid heat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Bone fractures

Large magnets can crush fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.

Magnets are brittle

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Health Danger

Patients with a ICD should keep an large gap from magnets. The magnetic field can disrupt the operation of the implant.

Adults only

Only for adults. Tiny parts can be swallowed, leading to serious injuries. Keep away from kids and pets.

Protect data

Equipment safety: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

Nickel allergy

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness appears, immediately stop working with magnets and wear gloves.

Phone sensors

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

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