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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

4.92 with VAT / pcs + price for transport

4.00 ZŁ net + 23% VAT / pcs

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Technical of the product - 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

Technical modeling of the magnet - report

The following information represent the outcome of a engineering simulation. Results are based on models for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Please consider these data as a reference point when designing systems.

Table 1: Static force (force vs gap) - 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
weak grip
10 mm 763 Gs
76.3 mT
0.21 kg / 0.46 pounds
210.3 g / 2.1 N
weak grip
15 mm 349 Gs
34.9 mT
0.04 kg / 0.10 pounds
44.0 g / 0.4 N
weak grip
20 mm 184 Gs
18.4 mT
0.01 kg / 0.03 pounds
12.2 g / 0.1 N
weak grip
30 mm 68 Gs
6.8 mT
0.00 kg / 0.00 pounds
1.7 g / 0.0 N
weak grip
50 mm 17 Gs
1.7 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
weak grip

Table 2: Vertical load (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

Table 3: Wall mounting (shearing) - 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

Table 4: Steel thickness (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

Table 5: Thermal stability (material behavior) - thermal limit
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

Table 6: Two magnets (repulsion) - forces in the system
MW 15x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (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

Table 7: Safety (HSE) (implants) - 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
Timepiece 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Remote 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

Table 8: Impact energy (cracking risk) - collision effects
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

Table 9: Anti-corrosion coating 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)

Table 10: Construction data (Pc)
MW 15x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 8 074 Mx 80.7 µWb
Pc Coefficient 0.61 High (Stable)

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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly reduces the holding force.

3. Temperature resistance

*For standard magnets, the max working temp 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.

Engineering data and GPSR
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%
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: 010032-2026
Quick Unit Converter
Magnet pull force

Field Strength

Other products

The offered product is an incredibly powerful cylindrical magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø15x8 mm, guarantees maximum efficiency. The MW 15x8 / N38 model boasts high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 7.37 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid 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.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 72.28 N with a weight of only 10.6 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability 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 even stronger 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 warehouse.
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.
This cylinder is magnetized axially (along the height of 8 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 as well as disadvantages of neodymium magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have constant strength, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • In other words, due to the aesthetic layer of gold, the element gains a professional look,
  • Magnetic induction on the top side of the magnet turns out to be maximum,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Due to the option of accurate forming and customization to custom needs, NdFeB magnets can be modeled in a variety of forms and dimensions, which increases their versatility,
  • Significant place in advanced technology sectors – they find application in computer drives, electric drive systems, medical equipment, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions

Disadvantages

Disadvantages of neodymium magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of producing nuts in the magnet and complicated shapes - preferred is casing - magnetic holder.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
  • With mass production the cost of neodymium magnets is a challenge,

Pull force analysis

Maximum holding power of the magnet – what contributes to it?

Magnet power was determined for ideal contact conditions, taking into account:
  • with the contact of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • without the slightest insulating layer between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at ambient temperature room level

Key elements affecting lifting force

In practice, the actual lifting capacity is determined by several key aspects, ranked from crucial:
  • Clearance – existence of foreign body (rust, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate decreases the lifting capacity.

Warnings
Conscious usage

Handle with care. Neodymium magnets attract from a distance and connect with massive power, often faster than you can react.

Physical harm

Danger of trauma: The pulling power is so great that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.

Danger to the youngest

Strictly store magnets away from children. Choking hazard is significant, and the consequences of magnets connecting inside the body are very dangerous.

Cards and drives

Do not bring magnets near a purse, computer, or screen. The magnetic field can permanently damage these devices and wipe information from cards.

Thermal limits

Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. This process is irreversible.

GPS and phone interference

Note: neodymium magnets produce a field that interferes with precision electronics. Keep a safe distance from your mobile, device, and navigation systems.

Shattering risk

Neodymium magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets will cause them shattering into small pieces.

Avoid contact if allergic

It is widely known that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, prevent touching magnets with bare hands or select coated magnets.

Implant safety

Life threat: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Mechanical processing

Drilling and cutting of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Caution! More info about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98