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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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Lifting power as well as structure of a neodymium magnet can be tested with our online calculation tool.

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Technical 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

Physical modeling of the product - technical parameters

These information represent the direct effect of a physical calculation. Values are based on models for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Treat these data as a reference point 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
crushing
1 mm 3563 Gs
356.3 mT
39.16 kg / 86.33 LBS
39159.5 g / 384.2 N
crushing
2 mm 3398 Gs
339.8 mT
35.62 kg / 78.52 LBS
35617.1 g / 349.4 N
crushing
3 mm 3228 Gs
322.8 mT
32.13 kg / 70.84 LBS
32130.5 g / 315.2 N
crushing
5 mm 2880 Gs
288.0 mT
25.58 kg / 56.40 LBS
25584.2 g / 251.0 N
crushing
10 mm 2069 Gs
206.9 mT
13.20 kg / 29.09 LBS
13196.7 g / 129.5 N
crushing
15 mm 1439 Gs
143.9 mT
6.38 kg / 14.07 LBS
6383.1 g / 62.6 N
medium risk
20 mm 999 Gs
99.9 mT
3.08 kg / 6.79 LBS
3077.9 g / 30.2 N
medium risk
30 mm 507 Gs
50.7 mT
0.79 kg / 1.75 LBS
792.4 g / 7.8 N
weak grip
50 mm 169 Gs
16.9 mT
0.09 kg / 0.19 LBS
88.4 g / 0.9 N
weak grip

Table 2: Slippage load (wall)
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 (sliding) - behavior on slippery surfaces
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: Thermal stability (material behavior) - resistance threshold
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) - forces in the system
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 (electronics) - precautionary measures
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: Impact energy (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: Anti-corrosion coating durability
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: Hydrostatics and buoyancy
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains merely ~20% of its nominal pull.

2. Steel saturation

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

3. Heat tolerance

*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) = 0.48

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 specification and ecology
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: 010067-2026
Quick Unit Converter
Pulling force

Magnetic Induction

Other offers

This product is an incredibly powerful cylinder magnet, made from modern NdFeB material, which, with dimensions of Ø40x15 mm, guarantees optimal power. This specific item boasts high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding 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 quick order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 418.33 N with a weight of only 141.37 g, this cylindrical magnet is indispensable in electronics 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 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 frequently chosen 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 lifting capacity 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 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. 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 neodymium magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their magnetic field is durable, and after approximately ten years it decreases only by ~1% (theoretically),
  • Neodymium magnets are characterized by highly resistant to demagnetization caused by magnetic disturbances,
  • By covering with a lustrous layer of silver, the element presents an modern look,
  • Magnetic induction on the working layer of the magnet turns out to be extremely intense,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of individual machining and adjusting to concrete conditions,
  • Wide application in advanced technology sectors – they serve a role in data components, motor assemblies, medical equipment, and complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using cover - magnetic holder.
  • Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these devices are able to disrupt the diagnostic process medical after entering the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting capacity of the magnetwhat it depends on?

Holding force of 42.64 kg is a measurement result performed under the following configuration:
  • using a sheet made of mild steel, serving as a ideal flux conductor
  • whose transverse dimension reaches at least 10 mm
  • with a surface cleaned and smooth
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction vertical to the mounting surface
  • in neutral thermal conditions

Determinants of lifting force in real conditions

During everyday use, the real power results from several key aspects, presented from crucial:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Material type – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets
Fire warning

Dust created during cutting of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Handling guide

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Operating temperature

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

GPS and phone interference

GPS units and mobile phones are highly susceptible to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Finger safety

Risk of injury: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

Do not give to children

Absolutely store magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are fatal.

Safe distance

Data protection: Strong magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, mechanical watches).

Life threat

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Nickel allergy

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness appears, immediately stop working with magnets and use protective gear.

Protective goggles

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them cracking into shards.

Security! Need more info? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98