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MW 40x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010067

GTIN/EAN: 5906301810667

Diameter Ø

40 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

141.37 g

Magnetization Direction

↑ axial

Load capacity

42.64 kg / 418.33 N

Magnetic Induction

371.91 mT / 3719 Gs

Coating

[NiCuNi] Nickel

65.93 with VAT / pcs + price for transport

53.60 ZŁ net + 23% VAT / pcs

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Detailed specification - MW 40x15 / N38 - cylindrical magnet

Specification / characteristics - MW 40x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010067
GTIN/EAN 5906301810667
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 15 mm [±0,1 mm]
Weight 141.37 g
Magnetization Direction ↑ axial
Load capacity ~ ? 42.64 kg / 418.33 N
Magnetic Induction ~ ? 371.91 mT / 3719 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x15 / 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 modeling of the assembly - technical parameters

The following values are the outcome of a physical simulation. Results rely on algorithms for the material Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Treat these calculations as a supplementary guide for designers.

Table 1: Static force (force vs distance) - power drop
MW 40x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3718 Gs
371.8 mT
42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
dangerous!
1 mm 3563 Gs
356.3 mT
39.16 kg / 86.33 lbs
39159.5 g / 384.2 N
dangerous!
2 mm 3398 Gs
339.8 mT
35.62 kg / 78.52 lbs
35617.1 g / 349.4 N
dangerous!
3 mm 3228 Gs
322.8 mT
32.13 kg / 70.84 lbs
32130.5 g / 315.2 N
dangerous!
5 mm 2880 Gs
288.0 mT
25.58 kg / 56.40 lbs
25584.2 g / 251.0 N
dangerous!
10 mm 2069 Gs
206.9 mT
13.20 kg / 29.09 lbs
13196.7 g / 129.5 N
dangerous!
15 mm 1439 Gs
143.9 mT
6.38 kg / 14.07 lbs
6383.1 g / 62.6 N
strong
20 mm 999 Gs
99.9 mT
3.08 kg / 6.79 lbs
3077.9 g / 30.2 N
strong
30 mm 507 Gs
50.7 mT
0.79 kg / 1.75 lbs
792.4 g / 7.8 N
safe
50 mm 169 Gs
16.9 mT
0.09 kg / 0.19 lbs
88.4 g / 0.9 N
safe

Table 2: Shear capacity (vertical surface)
MW 40x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 8.53 kg / 18.80 lbs
8528.0 g / 83.7 N
1 mm Stal (~0.2) 7.83 kg / 17.27 lbs
7832.0 g / 76.8 N
2 mm Stal (~0.2) 7.12 kg / 15.71 lbs
7124.0 g / 69.9 N
3 mm Stal (~0.2) 6.43 kg / 14.17 lbs
6426.0 g / 63.0 N
5 mm Stal (~0.2) 5.12 kg / 11.28 lbs
5116.0 g / 50.2 N
10 mm Stal (~0.2) 2.64 kg / 5.82 lbs
2640.0 g / 25.9 N
15 mm Stal (~0.2) 1.28 kg / 2.81 lbs
1276.0 g / 12.5 N
20 mm Stal (~0.2) 0.62 kg / 1.36 lbs
616.0 g / 6.0 N
30 mm Stal (~0.2) 0.16 kg / 0.35 lbs
158.0 g / 1.5 N
50 mm Stal (~0.2) 0.02 kg / 0.04 lbs
18.0 g / 0.2 N

Table 3: Vertical assembly (shearing) - vertical pull
MW 40x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
12.79 kg / 28.20 lbs
12792.0 g / 125.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.53 kg / 18.80 lbs
8528.0 g / 83.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.26 kg / 9.40 lbs
4264.0 g / 41.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
21.32 kg / 47.00 lbs
21320.0 g / 209.1 N

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 40x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
2.13 kg / 4.70 lbs
2132.0 g / 20.9 N
1 mm
13%
5.33 kg / 11.75 lbs
5330.0 g / 52.3 N
2 mm
25%
10.66 kg / 23.50 lbs
10660.0 g / 104.6 N
3 mm
38%
15.99 kg / 35.25 lbs
15990.0 g / 156.9 N
5 mm
63%
26.65 kg / 58.75 lbs
26650.0 g / 261.4 N
10 mm
100%
42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
11 mm
100%
42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
12 mm
100%
42.64 kg / 94.00 lbs
42640.0 g / 418.3 N

Table 5: Working in heat (stability) - power drop
MW 40x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 42.64 kg / 94.00 lbs
42640.0 g / 418.3 N
OK
40 °C -2.2% 41.70 kg / 91.94 lbs
41701.9 g / 409.1 N
OK
60 °C -4.4% 40.76 kg / 89.87 lbs
40763.8 g / 399.9 N
80 °C -6.6% 39.83 kg / 87.80 lbs
39825.8 g / 390.7 N
100 °C -28.8% 30.36 kg / 66.93 lbs
30359.7 g / 297.8 N

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 40x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 107.12 kg / 236.16 lbs
5 156 Gs
16.07 kg / 35.42 lbs
16068 g / 157.6 N
N/A
1 mm 102.82 kg / 226.67 lbs
7 286 Gs
15.42 kg / 34.00 lbs
15422 g / 151.3 N
92.53 kg / 204.00 lbs
~0 Gs
2 mm 98.38 kg / 216.89 lbs
7 127 Gs
14.76 kg / 32.53 lbs
14757 g / 144.8 N
88.54 kg / 195.20 lbs
~0 Gs
3 mm 93.92 kg / 207.06 lbs
6 964 Gs
14.09 kg / 31.06 lbs
14088 g / 138.2 N
84.53 kg / 186.36 lbs
~0 Gs
5 mm 85.07 kg / 187.55 lbs
6 627 Gs
12.76 kg / 28.13 lbs
12760 g / 125.2 N
76.56 kg / 168.79 lbs
~0 Gs
10 mm 64.27 kg / 141.70 lbs
5 761 Gs
9.64 kg / 21.25 lbs
9641 g / 94.6 N
57.85 kg / 127.53 lbs
~0 Gs
20 mm 33.15 kg / 73.09 lbs
4 137 Gs
4.97 kg / 10.96 lbs
4973 g / 48.8 N
29.84 kg / 65.78 lbs
~0 Gs
50 mm 3.84 kg / 8.47 lbs
1 408 Gs
0.58 kg / 1.27 lbs
576 g / 5.7 N
3.46 kg / 7.62 lbs
~0 Gs
60 mm 1.99 kg / 4.39 lbs
1 014 Gs
0.30 kg / 0.66 lbs
299 g / 2.9 N
1.79 kg / 3.95 lbs
~0 Gs
70 mm 1.08 kg / 2.38 lbs
747 Gs
0.16 kg / 0.36 lbs
162 g / 1.6 N
0.97 kg / 2.14 lbs
~0 Gs
80 mm 0.61 kg / 1.35 lbs
563 Gs
0.09 kg / 0.20 lbs
92 g / 0.9 N
0.55 kg / 1.22 lbs
~0 Gs
90 mm 0.36 kg / 0.80 lbs
432 Gs
0.05 kg / 0.12 lbs
54 g / 0.5 N
0.33 kg / 0.72 lbs
~0 Gs
100 mm 0.22 kg / 0.49 lbs
339 Gs
0.03 kg / 0.07 lbs
33 g / 0.3 N
0.20 kg / 0.44 lbs
~0 Gs

Table 7: Hazards (implants) - warnings
MW 40x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 19.0 cm
Hearing aid 10 Gs (1.0 mT) 15.0 cm
Timepiece 20 Gs (2.0 mT) 11.5 cm
Mobile device 40 Gs (4.0 mT) 9.0 cm
Remote 50 Gs (5.0 mT) 8.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm

Table 8: Dynamics (cracking risk) - warning
MW 40x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.63 km/h
(5.73 m/s)
2.32 J
30 mm 30.69 km/h
(8.52 m/s)
5.14 J
50 mm 39.22 km/h
(10.89 m/s)
8.39 J
100 mm 55.39 km/h
(15.39 m/s)
16.73 J

Table 9: Corrosion resistance
MW 40x15 / 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 40x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 48 650 Mx 486.5 µWb
Pc Coefficient 0.48 Low (Flat)

Table 11: Submerged application
MW 40x15 / N38

Environment Effective steel pull Effect
Air (land) 42.64 kg Standard
Water (riverbed) 48.82 kg
(+6.18 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. Vertical hold

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

2. Plate thickness effect

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

3. Temperature resistance

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48

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%
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: 010067-2026
Magnet Unit Converter
Force (pull)

Field Strength

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The presented product is an extremely powerful rod magnet, made from durable NdFeB material, which, at dimensions of Ø40x15 mm, guarantees maximum efficiency. This specific item is characterized by a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 42.64 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 418.33 N with a weight of only 141.37 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 chipping the coating of this precision component. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø40x15), 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 15 mm. The key parameter here is the holding force amounting to approximately 42.64 kg (force ~418.33 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 15 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 diametrically if your project requires it.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They do not lose power, even during nearly 10 years – the drop in lifting capacity is only ~1% (theoretically),
  • Magnets perfectly resist against loss of magnetization caused by ambient magnetic noise,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to look better,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in constructing and the ability to customize to complex applications,
  • Significant place in future technologies – they find application in computer drives, drive modules, diagnostic systems, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in small systems

Limitations

Disadvantages of neodymium magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • 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 durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We recommend casing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products can complicate diagnosis medical after entering the body.
  • With large orders the cost of neodymium magnets is a challenge,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

The force parameter is a measurement result executed under the following configuration:
  • with the application of a yoke made of special test steel, ensuring full magnetic saturation
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • characterized by smoothness
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at room temperature

Practical lifting capacity: influencing factors

During everyday use, the actual lifting capacity is determined by a number of factors, listed from crucial:
  • Distance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Plate thickness – too thin steel does not close the flux, causing part of the power to be wasted into the air.
  • Chemical composition of the base – mild steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature – heating the magnet causes a temporary drop of force. Check the thermal limit for a given model.

Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Fire risk

Mechanical processing of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Bone fractures

Danger of trauma: The attraction force is so immense that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.

Magnetic media

Data protection: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, timepieces).

Implant safety

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, immediately stop working with magnets and use protective gear.

GPS Danger

GPS units and mobile phones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

This is not a toy

Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are tragic.

Immense force

Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Do not overheat magnets

Watch the temperature. Heating the magnet above 80 degrees Celsius will ruin its properties and strength.

Risk of cracking

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Caution! 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