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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

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Technical - 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

Physical analysis of the assembly - report

The following values constitute the outcome of a engineering analysis. Values were calculated on models for the class Nd2Fe14B. Real-world performance may differ. Use these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
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 pounds
27730.0 g / 272.0 N
crushing
1 mm 2678 Gs
267.8 mT
25.89 kg / 57.08 pounds
25889.6 g / 254.0 N
crushing
2 mm 2573 Gs
257.3 mT
23.89 kg / 52.68 pounds
23893.3 g / 234.4 N
crushing
3 mm 2459 Gs
245.9 mT
21.83 kg / 48.12 pounds
21827.6 g / 214.1 N
crushing
5 mm 2216 Gs
221.6 mT
17.73 kg / 39.08 pounds
17728.1 g / 173.9 N
crushing
10 mm 1611 Gs
161.1 mT
9.37 kg / 20.66 pounds
9371.0 g / 91.9 N
medium risk
15 mm 1121 Gs
112.1 mT
4.54 kg / 10.01 pounds
4538.6 g / 44.5 N
medium risk
20 mm 775 Gs
77.5 mT
2.17 kg / 4.77 pounds
2165.8 g / 21.2 N
medium risk
30 mm 387 Gs
38.7 mT
0.54 kg / 1.19 pounds
539.8 g / 5.3 N
safe
50 mm 125 Gs
12.5 mT
0.06 kg / 0.12 pounds
56.6 g / 0.6 N
safe

Table 2: Vertical capacity (wall)
MW 40x10 / N38

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

Table 3: Wall mounting (shearing) - vertical pull
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 pounds
8319.0 g / 81.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
5.55 kg / 12.23 pounds
5546.0 g / 54.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.77 kg / 6.11 pounds
2773.0 g / 27.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
13.87 kg / 30.57 pounds
13865.0 g / 136.0 N

Table 4: Steel thickness (saturation) - power losses
MW 40x10 / N38

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

Table 5: Thermal stability (stability) - power drop
MW 40x10 / N38

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

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 40x10 / N38

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

Table 7: Hazards (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
Remote 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) - warning
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: Corrosion resistance
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: Construction 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: Underwater work (magnet fishing)
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. Shear force

*Caution: On a vertical surface, the magnet retains merely a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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%
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: 010066-2026
Measurement Calculator
Pulling force

Field Strength

Other products

This product is an exceptionally strong cylinder magnet, produced from modern NdFeB material, which, with dimensions of Ø40x10 mm, guarantees maximum efficiency. The MW 40x10 / N38 model features an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 27.73 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its 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 DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. 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 every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 40.1 mm) using epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest 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 warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 40 mm and height 10 mm. The key parameter here is the holding force amounting to approximately 27.73 kg (force ~271.99 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 10 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.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • A magnet with a shiny nickel surface is more attractive,
  • Neodymium magnets create maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • 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 potential of flexible molding and adaptation to individualized projects, NdFeB magnets can be created in a variety of geometric configurations, which amplifies use scope,
  • Versatile presence in high-tech industry – they serve a role in data components, brushless drives, medical devices, and complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets: application proposals
  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
  • We recommend casing - magnetic holder, due to difficulties in creating threads inside the magnet and complex forms.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small elements of these magnets 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

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

The declared magnet strength refers to the peak performance, obtained under laboratory conditions, specifically:
  • using a plate made of high-permeability steel, functioning as a ideal flux conductor
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with an polished touching surface
  • without the slightest insulating layer between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • in stable room temperature

Magnet lifting force in use – key factors

Holding efficiency is influenced by working environment parameters, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy admixtures decrease magnetic permeability and lifting capacity.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Warnings
Precision electronics

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

Caution required

Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Finger safety

Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Danger to the youngest

Only for adults. Tiny parts can be swallowed, causing intestinal necrosis. Store out of reach of children and animals.

Material brittleness

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Life threat

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

Cards and drives

Avoid bringing magnets close to a purse, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Mechanical processing

Dust produced during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Sensitization to coating

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction happens, immediately stop handling magnets and wear gloves.

Operating temperature

Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and pulling force.

Warning! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98