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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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Physical properties - 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 magnet - report

Presented data are the result of a mathematical calculation. Results were calculated on models for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Please consider these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - 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 lbs
27730.0 g / 272.0 N
crushing
1 mm 2678 Gs
267.8 mT
25.89 kg / 57.08 lbs
25889.6 g / 254.0 N
crushing
2 mm 2573 Gs
257.3 mT
23.89 kg / 52.68 lbs
23893.3 g / 234.4 N
crushing
3 mm 2459 Gs
245.9 mT
21.83 kg / 48.12 lbs
21827.6 g / 214.1 N
crushing
5 mm 2216 Gs
221.6 mT
17.73 kg / 39.08 lbs
17728.1 g / 173.9 N
crushing
10 mm 1611 Gs
161.1 mT
9.37 kg / 20.66 lbs
9371.0 g / 91.9 N
strong
15 mm 1121 Gs
112.1 mT
4.54 kg / 10.01 lbs
4538.6 g / 44.5 N
strong
20 mm 775 Gs
77.5 mT
2.17 kg / 4.77 lbs
2165.8 g / 21.2 N
strong
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: Vertical capacity (vertical surface)
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: Vertical assembly (sliding) - 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 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: Material efficiency (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 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 (material behavior) - resistance threshold
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 (attraction) - field range
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 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: Safety (HSE) (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
Mobile device 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 (cracking risk) - 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: 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 (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: Hydrostatics and buoyancy
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%
Rust risk: 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 wall, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Power loss vs temp

*For N38 material, the safety 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
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%
Sustainability
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 Induction

View also proposals

The offered product is a very strong rod magnet, manufactured from modern NdFeB material, which, at dimensions of Ø40x10 mm, guarantees maximum efficiency. This specific item boasts 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 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, guaranteeing an aesthetic appearance and durability for years.
It finds application 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 low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure stability in industry, 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 suitable for 90% of applications in modeling and machine building, where excessive 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 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 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 secures it against external factors, 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. 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.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • Their power is durable, and after approximately 10 years it decreases only by ~1% (according to research),
  • Magnets effectively resist against loss of magnetization caused by ambient magnetic noise,
  • Thanks to the smooth finish, the surface of nickel, gold-plated, or silver gives an visually attractive appearance,
  • Neodymium magnets create maximum magnetic induction on a small area, which allows for strong attraction,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of accurate forming and adjusting to defined applications,
  • Wide application in high-tech industry – they are used in hard drives, electric drive systems, diagnostic systems, as well as other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Weaknesses

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their power 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 stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in creating threads and complex forms in magnets, we recommend using a housing - magnetic holder.
  • Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Lifting parameters

Best holding force of the magnet in ideal parameterswhat affects it?

Magnet power is the result of a measurement for the most favorable conditions, assuming:
  • with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
  • with a thickness of at least 10 mm
  • characterized by lack of roughness
  • without the slightest insulating layer between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

During everyday use, the actual lifting capacity results from many variables, listed from crucial:
  • Distance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Electronic hazard

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

Magnetic interference

GPS units and smartphones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can decalibrate the internal compass in your phone.

Product not for children

Strictly keep magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are life-threatening.

Conscious usage

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

Nickel allergy

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent direct skin contact or select encased magnets.

Life threat

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Physical harm

Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Eye protection

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Thermal limits

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Fire warning

Dust produced during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Important! Looking for details? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98