Neodymium magnets – most powerful on the market

Want to buy really powerful magnets? We have in stock complete range of various shapes and sizes. Perfect for for domestic applications, workshop and industrial tasks. Check our offer available immediately.

discover full offer

Magnet fishing sets (searchers)

Start your adventure related to seabed exploration! Our specialized grips (F200, F400) provide grip certainty and huge lifting capacity. Solid, corrosion-resistant housing and strong lines will perform in any water.

find searching equipment

Magnetic mounting systems

Professional solutions for fixing non-invasive. Threaded grips (external or internal) provide instant organization of work on warehouses. Perfect for mounting lighting, sensors and banners.

see industrial applications

📦 Fast shipping: buy by 14:00, we'll ship today!

Dhit sp. z o.o.
Product available Ships tomorrow

MW 40x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010066

GTIN/EAN: 5906301810650

Diameter Ø

40 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

94.25 g

Magnetization Direction

↑ axial

Load capacity

27.73 kg / 271.99 N

Magnetic Induction

277.22 mT / 2772 Gs

Coating

[NiCuNi] Nickel

36.57 with VAT / pcs + price for transport

29.73 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
29.73 ZŁ
36.57 ZŁ
price from 30 pcs
27.95 ZŁ
34.37 ZŁ
price from 90 pcs
26.16 ZŁ
32.18 ZŁ
Hunting for a discount?

Call us +48 888 99 98 98 alternatively let us know via contact form the contact form page.
Lifting power and appearance of neodymium magnets can be analyzed using our power calculator.

Same-day processing for orders placed before 14:00.

Product card - MW 40x10 / N38 - cylindrical magnet

Specification / characteristics - MW 40x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010066
GTIN/EAN 5906301810650
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 40 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 94.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 27.73 kg / 271.99 N
Magnetic Induction ~ ? 277.22 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x10 / 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 simulation of the assembly - data

The following data constitute the outcome of a mathematical calculation. Values were calculated on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Please consider these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - interaction chart
MW 40x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2772 Gs
277.2 mT
27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
critical level
1 mm 2678 Gs
267.8 mT
25.89 kg / 57.08 LBS
25889.6 g / 254.0 N
critical level
2 mm 2573 Gs
257.3 mT
23.89 kg / 52.68 LBS
23893.3 g / 234.4 N
critical level
3 mm 2459 Gs
245.9 mT
21.83 kg / 48.12 LBS
21827.6 g / 214.1 N
critical level
5 mm 2216 Gs
221.6 mT
17.73 kg / 39.08 LBS
17728.1 g / 173.9 N
critical level
10 mm 1611 Gs
161.1 mT
9.37 kg / 20.66 LBS
9371.0 g / 91.9 N
medium risk
15 mm 1121 Gs
112.1 mT
4.54 kg / 10.01 LBS
4538.6 g / 44.5 N
medium risk
20 mm 775 Gs
77.5 mT
2.17 kg / 4.77 LBS
2165.8 g / 21.2 N
medium risk
30 mm 387 Gs
38.7 mT
0.54 kg / 1.19 LBS
539.8 g / 5.3 N
low risk
50 mm 125 Gs
12.5 mT
0.06 kg / 0.12 LBS
56.6 g / 0.6 N
low risk

Table 2: Slippage force (wall)
MW 40x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 5.55 kg / 12.23 LBS
5546.0 g / 54.4 N
1 mm Stal (~0.2) 5.18 kg / 11.42 LBS
5178.0 g / 50.8 N
2 mm Stal (~0.2) 4.78 kg / 10.53 LBS
4778.0 g / 46.9 N
3 mm Stal (~0.2) 4.37 kg / 9.63 LBS
4366.0 g / 42.8 N
5 mm Stal (~0.2) 3.55 kg / 7.82 LBS
3546.0 g / 34.8 N
10 mm Stal (~0.2) 1.87 kg / 4.13 LBS
1874.0 g / 18.4 N
15 mm Stal (~0.2) 0.91 kg / 2.00 LBS
908.0 g / 8.9 N
20 mm Stal (~0.2) 0.43 kg / 0.96 LBS
434.0 g / 4.3 N
30 mm Stal (~0.2) 0.11 kg / 0.24 LBS
108.0 g / 1.1 N
50 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 N

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 40x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
8.32 kg / 18.34 LBS
8319.0 g / 81.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
5.55 kg / 12.23 LBS
5546.0 g / 54.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.77 kg / 6.11 LBS
2773.0 g / 27.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
13.87 kg / 30.57 LBS
13865.0 g / 136.0 N

Table 4: Steel thickness (saturation) - sheet metal selection
MW 40x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.39 kg / 3.06 LBS
1386.5 g / 13.6 N
1 mm
13%
3.47 kg / 7.64 LBS
3466.3 g / 34.0 N
2 mm
25%
6.93 kg / 15.28 LBS
6932.5 g / 68.0 N
3 mm
38%
10.40 kg / 22.93 LBS
10398.8 g / 102.0 N
5 mm
63%
17.33 kg / 38.21 LBS
17331.3 g / 170.0 N
10 mm
100%
27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
11 mm
100%
27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
12 mm
100%
27.73 kg / 61.13 LBS
27730.0 g / 272.0 N

Table 5: Thermal stability (stability) - thermal limit
MW 40x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 27.73 kg / 61.13 LBS
27730.0 g / 272.0 N
OK
40 °C -2.2% 27.12 kg / 59.79 LBS
27119.9 g / 266.0 N
OK
60 °C -4.4% 26.51 kg / 58.44 LBS
26509.9 g / 260.1 N
80 °C -6.6% 25.90 kg / 57.10 LBS
25899.8 g / 254.1 N
100 °C -28.8% 19.74 kg / 43.53 LBS
19743.8 g / 193.7 N

Table 6: Two magnets (repulsion) - field range
MW 40x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 59.52 kg / 131.22 LBS
4 382 Gs
8.93 kg / 19.68 LBS
8928 g / 87.6 N
N/A
1 mm 57.61 kg / 127.01 LBS
5 454 Gs
8.64 kg / 19.05 LBS
8642 g / 84.8 N
51.85 kg / 114.31 LBS
~0 Gs
2 mm 55.57 kg / 122.52 LBS
5 357 Gs
8.34 kg / 18.38 LBS
8336 g / 81.8 N
50.01 kg / 110.26 LBS
~0 Gs
3 mm 53.46 kg / 117.85 LBS
5 254 Gs
8.02 kg / 17.68 LBS
8019 g / 78.7 N
48.11 kg / 106.07 LBS
~0 Gs
5 mm 49.08 kg / 108.20 LBS
5 034 Gs
7.36 kg / 16.23 LBS
7362 g / 72.2 N
44.17 kg / 97.38 LBS
~0 Gs
10 mm 38.05 kg / 83.89 LBS
4 433 Gs
5.71 kg / 12.58 LBS
5708 g / 56.0 N
34.25 kg / 75.50 LBS
~0 Gs
20 mm 20.11 kg / 44.35 LBS
3 223 Gs
3.02 kg / 6.65 LBS
3017 g / 29.6 N
18.10 kg / 39.91 LBS
~0 Gs
50 mm 2.27 kg / 5.01 LBS
1 083 Gs
0.34 kg / 0.75 LBS
341 g / 3.3 N
2.05 kg / 4.51 LBS
~0 Gs
60 mm 1.16 kg / 2.55 LBS
773 Gs
0.17 kg / 0.38 LBS
174 g / 1.7 N
1.04 kg / 2.30 LBS
~0 Gs
70 mm 0.62 kg / 1.36 LBS
565 Gs
0.09 kg / 0.20 LBS
93 g / 0.9 N
0.56 kg / 1.23 LBS
~0 Gs
80 mm 0.35 kg / 0.76 LBS
422 Gs
0.05 kg / 0.11 LBS
52 g / 0.5 N
0.31 kg / 0.69 LBS
~0 Gs
90 mm 0.20 kg / 0.44 LBS
322 Gs
0.03 kg / 0.07 LBS
30 g / 0.3 N
0.18 kg / 0.40 LBS
~0 Gs
100 mm 0.12 kg / 0.27 LBS
251 Gs
0.02 kg / 0.04 LBS
18 g / 0.2 N
0.11 kg / 0.24 LBS
~0 Gs

Table 7: Protective zones (electronics) - warnings
MW 40x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.5 cm
Hearing aid 10 Gs (1.0 mT) 13.0 cm
Timepiece 20 Gs (2.0 mT) 10.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 8.0 cm
Car key 50 Gs (5.0 mT) 7.5 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm

Table 8: Impact energy (kinetic energy) - collision effects
MW 40x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.63 km/h
(5.73 m/s)
1.55 J
30 mm 30.32 km/h
(8.42 m/s)
3.34 J
50 mm 38.73 km/h
(10.76 m/s)
5.45 J
100 mm 54.71 km/h
(15.20 m/s)
10.88 J

Table 9: Anti-corrosion coating durability
MW 40x10 / 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: Electrical data (Flux)
MW 40x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 38 700 Mx 387.0 µWb
Pc Coefficient 0.35 Low (Flat)

Table 11: Submerged application
MW 40x10 / N38

Environment Effective steel pull Effect
Air (land) 27.73 kg Standard
Water (riverbed) 31.75 kg
(+4.02 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely reduces the holding force.

3. Heat tolerance

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.35

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 specification and ecology
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%
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: 010066-2026
Magnet Unit Converter
Magnet pull force

Magnetic Field

See more proposals

This product is a very strong cylindrical magnet, manufactured from modern NdFeB material, which, with dimensions of Ø40x10 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 27.73 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 271.99 N with a weight of only 94.25 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 40.1 mm) using two-component epoxy glues. 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.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø40x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 40 mm and height 10 mm. The value of 271.99 N means that the magnet is capable of holding a weight many times exceeding its own mass of 94.25 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, 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 40 mm. 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.

Pros as well as cons of neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • Neodymium magnets are characterized by remarkably resistant to demagnetization caused by magnetic disturbances,
  • A magnet with a metallic silver surface is more attractive,
  • Magnetic induction on the surface of the magnet turns out to be maximum,
  • 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...
  • In view of the option of free molding and adaptation to unique projects, neodymium magnets can be manufactured in a variety of shapes and sizes, which increases their versatility,
  • Significant place in modern technologies – they find application in magnetic memories, drive modules, medical devices, also other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of neodymium magnets:
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their strength 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
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating threads and complicated forms in magnets, we recommend using cover - magnetic mechanism.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum holding power of the magnet – what affects it?

The declared magnet strength concerns the limit force, measured under optimal environment, meaning:
  • with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
  • with a thickness minimum 10 mm
  • with an polished contact surface
  • with direct contact (no paint)
  • under axial force direction (90-degree angle)
  • at temperature room level

Lifting capacity in practice – influencing factors

In real-world applications, the actual lifting capacity depends on a number of factors, presented from most significant:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate reduces the holding force.

Safe handling of NdFeB magnets
No play value

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

Combustion hazard

Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Magnetic interference

A powerful magnetic field negatively affects the operation of compasses in phones and navigation systems. Do not bring magnets near a device to avoid breaking the sensors.

Do not overheat magnets

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Crushing force

Big blocks can crush fingers in a fraction of a second. Under no circumstances place your hand betwixt two attracting surfaces.

Metal Allergy

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness appears, cease working with magnets and use protective gear.

Handling rules

Exercise caution. Rare earth magnets attract from a long distance and connect with massive power, often quicker than you can move away.

Data carriers

Avoid bringing magnets near a wallet, computer, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Protective goggles

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Implant safety

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

Safety First! Want to know more? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98