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MW 8x20 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010475

GTIN/EAN: 5906301811138

5.00
Load capacity 1.30 kg / 12.75 N Magnetic Induction 607.01 mT / 6070 Gs
Diameter Ø
8 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
7.54 g
Magnetization Direction
→ diametrical
Coating
[NiCuNi] Nickel

4.60 with VAT / pcs + price for transport

3.74 zł net + 23% VAT / pcs

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Technical of the product - MW 8x20 / N38 - cylindrical magnet

Specification / characteristics - MW 8x20 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010475
GTIN/EAN 5906301811138
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 8 mm [±0,1 mm]
Height 20 mm [±0,1 mm]
Weight 7.54 g
Magnetization Direction → diametrical
Load capacity ~ ? 1.30 kg / 12.75 N
Magnetic Induction ~ ? 607.01 mT / 6070 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x20 / 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

Engineering analysis of the magnet - data

Presented values constitute the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MW 8x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 6064 Gs
606.4 mT
1.30 kg / 2.87 LBS
1300.0 g / 12.8 N
weak grip
1 mm 4587 Gs
458.7 mT
0.74 kg / 1.64 LBS
743.7 g / 7.3 N
weak grip
2 mm 3327 Gs
332.7 mT
0.39 kg / 0.86 LBS
391.4 g / 3.8 N
weak grip
3 mm 2388 Gs
238.8 mT
0.20 kg / 0.44 LBS
201.6 g / 2.0 N
weak grip
5 mm 1281 Gs
128.1 mT
0.06 kg / 0.13 LBS
58.0 g / 0.6 N
weak grip
10 mm 389 Gs
38.9 mT
0.01 kg / 0.01 LBS
5.4 g / 0.1 N
weak grip
15 mm 169 Gs
16.9 mT
0.00 kg / 0.00 LBS
1.0 g / 0.0 N
weak grip
20 mm 90 Gs
9.0 mT
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
weak grip
30 mm 35 Gs
3.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
50 mm 10 Gs
1.0 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip

Table 2: Sliding hold (vertical surface)
MW 8x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.26 kg / 0.57 LBS
260.0 g / 2.6 N
1 mm Stal (~0.2) 0.15 kg / 0.33 LBS
148.0 g / 1.5 N
2 mm Stal (~0.2) 0.08 kg / 0.17 LBS
78.0 g / 0.8 N
3 mm Stal (~0.2) 0.04 kg / 0.09 LBS
40.0 g / 0.4 N
5 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N

Table 3: Vertical assembly (shearing) - vertical pull
MW 8x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.39 kg / 0.86 LBS
390.0 g / 3.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.26 kg / 0.57 LBS
260.0 g / 2.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.13 kg / 0.29 LBS
130.0 g / 1.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.65 kg / 1.43 LBS
650.0 g / 6.4 N

Table 4: Material efficiency (saturation) - sheet metal selection
MW 8x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.13 kg / 0.29 LBS
130.0 g / 1.3 N
1 mm
25%
0.33 kg / 0.72 LBS
325.0 g / 3.2 N
2 mm
50%
0.65 kg / 1.43 LBS
650.0 g / 6.4 N
3 mm
75%
0.98 kg / 2.15 LBS
975.0 g / 9.6 N
5 mm
100%
1.30 kg / 2.87 LBS
1300.0 g / 12.8 N
10 mm
100%
1.30 kg / 2.87 LBS
1300.0 g / 12.8 N
11 mm
100%
1.30 kg / 2.87 LBS
1300.0 g / 12.8 N
12 mm
100%
1.30 kg / 2.87 LBS
1300.0 g / 12.8 N

Table 5: Thermal stability (stability) - power drop
MW 8x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.30 kg / 2.87 LBS
1300.0 g / 12.8 N
OK
40 °C -2.2% 1.27 kg / 2.80 LBS
1271.4 g / 12.5 N
OK
60 °C -4.4% 1.24 kg / 2.74 LBS
1242.8 g / 12.2 N
OK
80 °C -6.6% 1.21 kg / 2.68 LBS
1214.2 g / 11.9 N
100 °C -28.8% 0.93 kg / 2.04 LBS
925.6 g / 9.1 N

Table 6: Two magnets (repulsion) - field collision
MW 8x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 11.40 kg / 25.12 LBS
6 154 Gs
1.71 kg / 3.77 LBS
1709 g / 16.8 N
N/A
1 mm 8.76 kg / 19.31 LBS
10 632 Gs
1.31 kg / 2.90 LBS
1314 g / 12.9 N
7.88 kg / 17.38 LBS
~0 Gs
2 mm 6.52 kg / 14.37 LBS
9 174 Gs
0.98 kg / 2.16 LBS
978 g / 9.6 N
5.87 kg / 12.94 LBS
~0 Gs
3 mm 4.76 kg / 10.49 LBS
7 837 Gs
0.71 kg / 1.57 LBS
714 g / 7.0 N
4.28 kg / 9.44 LBS
~0 Gs
5 mm 2.46 kg / 5.43 LBS
5 637 Gs
0.37 kg / 0.81 LBS
369 g / 3.6 N
2.22 kg / 4.88 LBS
~0 Gs
10 mm 0.51 kg / 1.12 LBS
2 561 Gs
0.08 kg / 0.17 LBS
76 g / 0.7 N
0.46 kg / 1.01 LBS
~0 Gs
20 mm 0.05 kg / 0.10 LBS
778 Gs
0.01 kg / 0.02 LBS
7 g / 0.1 N
0.04 kg / 0.09 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
107 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
69 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
48 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
34 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
25 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
19 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Hazards (implants) - warnings
MW 8x20 / 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
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) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - warning
MW 8x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 8.56 km/h
(2.38 m/s)
0.02 J
30 mm 8.60 km/h
(2.39 m/s)
0.02 J
50 mm 8.60 km/h
(2.39 m/s)
0.02 J
100 mm 8.60 km/h
(2.39 m/s)
0.02 J

Table 9: Anti-corrosion coating durability
MW 8x20 / 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 (Flux)
MW 8x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 457 Mx 34.6 µWb
Pc Coefficient 1.31 High (Stable)

Table 11: Physics of underwater searching
MW 8x20 / N38

Environment Effective steel pull Effect
Air (land) 1.30 kg Standard
Water (riverbed) 1.49 kg
(+0.19 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!

1. Vertical hold

*Caution: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Heat tolerance

*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) = 1.31

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

Elemental analysis

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%

Environmental data

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: 010475-2026
Measurement Calculator

Magnet pull force


Magnetic Field

Other offers

The offered product is an extremely powerful cylindrical magnet, produced from durable NdFeB material, which, with dimensions of Ø8x20 mm, guarantees the highest energy density. The MW 8x20 / N38 model is characterized by high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 1.30 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 12.75 N with a weight of only 7.54 g, this rod is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using epoxy glues. To ensure stability 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 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 even stronger magnets in the same volume (Ø8x20), 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 8 mm and height 20 mm. The key parameter here is the lifting capacity amounting to approximately 1.30 kg (force ~12.75 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 20 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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 Nd2Fe14B magnets.

Advantages

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under external field action,
  • In other words, due to the shiny finish of nickel, the element gains visual value,
  • Magnets are characterized by maximum magnetic induction on the outer side,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to flexibility in constructing and the ability to customize to specific needs,
  • Significant place in high-tech industry – they are commonly used in computer drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • under axial force direction (90-degree angle)
  • at standard ambient temperature

Lifting capacity in real conditions – factors

Real force impacted by specific conditions, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Shattering risk

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Dust is flammable

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Health Danger

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Safe distance

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Pinching danger

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Handling guide

Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Product not for children

These products are not toys. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

Compass and GPS

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.

Warning! Details about risks in the article: Safety of working with magnets.