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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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Parameters along with shape of a neodymium magnet can be analyzed on our modular calculator.

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Technical of the product - 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

Engineering modeling of the magnet - technical parameters

These data represent the result of a physical analysis. Values are based on models for the material Nd2Fe14B. Real-world performance may differ from theoretical values. Please consider these data as a supplementary guide for designers.

Table 1: Static pull force (pull vs distance) - power drop
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
weak grip
50 mm 125 Gs
12.5 mT
0.06 kg / 0.12 pounds
56.6 g / 0.6 N
weak grip

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: Working in heat (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 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 (repulsion) - field collision
MW 40x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (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 (implants) - precautionary measures
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) - 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: Coating parameters (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 (Pc)
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

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

2. Steel saturation

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

3. Thermal stability

*For N38 grade, 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

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.

Engineering data and GPSR
Chemical composition
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
Measurement Calculator
Pulling force

Field Strength

Other proposals

This product is an exceptionally strong cylindrical magnet, composed of durable NdFeB material, which, with dimensions of Ø40x10 mm, guarantees the highest energy density. The MW 40x10 / N38 component features high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 27.73 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 271.99 N with a weight of only 94.25 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are suitable for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. 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 in continuous sale 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 compact 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.
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 diametrically if your project requires it.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Besides their remarkable pulling force, neodymium magnets offer the following advantages:
  • They do not lose strength, even over nearly 10 years – the drop in strength is only ~1% (based on measurements),
  • They have excellent resistance to magnetism drop when exposed to external fields,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of exact forming as well as modifying to defined requirements,
  • Significant place in modern industrial fields – they find application in hard drives, electric motors, medical equipment, as well as technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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 those in rubber or plastics, which prevent oxidation and corrosion.
  • Due to limitations in producing nuts and complicated shapes in magnets, we propose using cover - magnetic mount.
  • Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what contributes to it?

Breakaway force was defined for optimal configuration, including:
  • using a plate made of low-carbon steel, serving as a ideal flux conductor
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with a surface perfectly flat
  • without the slightest insulating layer between the magnet and steel
  • under axial force vector (90-degree angle)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

During everyday use, the real power results from many variables, ranked from most significant:
  • Gap (between the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Steel thickness – too thin plate does not close the flux, causing part of the power to be lost into the air.
  • Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
  • Surface condition – smooth surfaces ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with neodymium magnets
Flammability

Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Danger to the youngest

These products are not intended for children. Accidental ingestion of several magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and requires immediate surgery.

Bodily injuries

Large magnets can break fingers in a fraction of a second. Do not place your hand betwixt two attracting surfaces.

Magnetic interference

Note: neodymium magnets produce a field that disrupts sensitive sensors. Keep a safe distance from your mobile, tablet, and navigation systems.

Heat sensitivity

Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. This process is irreversible.

Shattering risk

Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets leads to them breaking into shards.

Data carriers

Do not bring magnets close to a purse, laptop, or screen. The magnetism can destroy these devices and erase data from cards.

Immense force

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Allergy Warning

Studies show that nickel (the usual finish) is a potent allergen. For allergy sufferers, refrain from direct skin contact or choose versions in plastic housing.

Implant safety

Individuals with a pacemaker must maintain an safe separation from magnets. The magnetic field can interfere with the functioning of the implant.

Warning! Details about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98