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MW 45x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010070

GTIN/EAN: 5906301810698

5.00

Diameter Ø

45 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

178.92 g

Magnetization Direction

↑ axial

Load capacity

48.55 kg / 476.32 N

Magnetic Induction

343.84 mT / 3438 Gs

Coating

[NiCuNi] Nickel

61.84 with VAT / pcs + price for transport

50.28 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 45x15 / N38 - cylindrical magnet

Specification / characteristics - MW 45x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010070
GTIN/EAN 5906301810698
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 45 mm [±0,1 mm]
Height 15 mm [±0,1 mm]
Weight 178.92 g
Magnetization Direction ↑ axial
Load capacity ~ ? 48.55 kg / 476.32 N
Magnetic Induction ~ ? 343.84 mT / 3438 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x15 / 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 magnet - data

The following data constitute the outcome of a engineering simulation. Values rely on models for the class Nd2Fe14B. Operational parameters might slightly differ. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs gap) - power drop
MW 45x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3438 Gs
343.8 mT
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
crushing
1 mm 3318 Gs
331.8 mT
45.21 kg / 99.68 lbs
45214.3 g / 443.6 N
crushing
2 mm 3189 Gs
318.9 mT
41.76 kg / 92.07 lbs
41762.8 g / 409.7 N
crushing
3 mm 3054 Gs
305.4 mT
38.30 kg / 84.44 lbs
38303.2 g / 375.8 N
crushing
5 mm 2774 Gs
277.4 mT
31.61 kg / 69.69 lbs
31610.0 g / 310.1 N
crushing
10 mm 2090 Gs
209.0 mT
17.95 kg / 39.57 lbs
17948.5 g / 176.1 N
crushing
15 mm 1521 Gs
152.1 mT
9.50 kg / 20.95 lbs
9500.8 g / 93.2 N
medium risk
20 mm 1096 Gs
109.6 mT
4.94 kg / 10.88 lbs
4936.3 g / 48.4 N
medium risk
30 mm 585 Gs
58.5 mT
1.41 kg / 3.10 lbs
1407.9 g / 13.8 N
safe
50 mm 205 Gs
20.5 mT
0.17 kg / 0.38 lbs
172.6 g / 1.7 N
safe

Table 2: Slippage force (wall)
MW 45x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 9.71 kg / 21.41 lbs
9710.0 g / 95.3 N
1 mm Stal (~0.2) 9.04 kg / 19.93 lbs
9042.0 g / 88.7 N
2 mm Stal (~0.2) 8.35 kg / 18.41 lbs
8352.0 g / 81.9 N
3 mm Stal (~0.2) 7.66 kg / 16.89 lbs
7660.0 g / 75.1 N
5 mm Stal (~0.2) 6.32 kg / 13.94 lbs
6322.0 g / 62.0 N
10 mm Stal (~0.2) 3.59 kg / 7.91 lbs
3590.0 g / 35.2 N
15 mm Stal (~0.2) 1.90 kg / 4.19 lbs
1900.0 g / 18.6 N
20 mm Stal (~0.2) 0.99 kg / 2.18 lbs
988.0 g / 9.7 N
30 mm Stal (~0.2) 0.28 kg / 0.62 lbs
282.0 g / 2.8 N
50 mm Stal (~0.2) 0.03 kg / 0.07 lbs
34.0 g / 0.3 N

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 45x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
14.56 kg / 32.11 lbs
14565.0 g / 142.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
9.71 kg / 21.41 lbs
9710.0 g / 95.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.86 kg / 10.70 lbs
4855.0 g / 47.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
24.28 kg / 53.52 lbs
24275.0 g / 238.1 N

Table 4: Material efficiency (saturation) - power losses
MW 45x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
2.43 kg / 5.35 lbs
2427.5 g / 23.8 N
1 mm
13%
6.07 kg / 13.38 lbs
6068.8 g / 59.5 N
2 mm
25%
12.14 kg / 26.76 lbs
12137.5 g / 119.1 N
3 mm
38%
18.21 kg / 40.14 lbs
18206.2 g / 178.6 N
5 mm
63%
30.34 kg / 66.90 lbs
30343.8 g / 297.7 N
10 mm
100%
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
11 mm
100%
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
12 mm
100%
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N

Table 5: Working in heat (stability) - resistance threshold
MW 45x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
OK
40 °C -2.2% 47.48 kg / 104.68 lbs
47481.9 g / 465.8 N
OK
60 °C -4.4% 46.41 kg / 102.32 lbs
46413.8 g / 455.3 N
80 °C -6.6% 45.35 kg / 99.97 lbs
45345.7 g / 444.8 N
100 °C -28.8% 34.57 kg / 76.21 lbs
34567.6 g / 339.1 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 45x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 115.89 kg / 255.50 lbs
4 958 Gs
17.38 kg / 38.32 lbs
17384 g / 170.5 N
N/A
1 mm 111.99 kg / 246.89 lbs
6 759 Gs
16.80 kg / 37.03 lbs
16798 g / 164.8 N
100.79 kg / 222.20 lbs
~0 Gs
2 mm 107.93 kg / 237.94 lbs
6 636 Gs
16.19 kg / 35.69 lbs
16189 g / 158.8 N
97.14 kg / 214.15 lbs
~0 Gs
3 mm 103.82 kg / 228.89 lbs
6 508 Gs
15.57 kg / 34.33 lbs
15573 g / 152.8 N
93.44 kg / 206.00 lbs
~0 Gs
5 mm 95.55 kg / 210.66 lbs
6 244 Gs
14.33 kg / 31.60 lbs
14333 g / 140.6 N
86.00 kg / 189.59 lbs
~0 Gs
10 mm 75.46 kg / 166.35 lbs
5 548 Gs
11.32 kg / 24.95 lbs
11318 g / 111.0 N
67.91 kg / 149.72 lbs
~0 Gs
20 mm 42.84 kg / 94.46 lbs
4 181 Gs
6.43 kg / 14.17 lbs
6427 g / 63.0 N
38.56 kg / 85.01 lbs
~0 Gs
50 mm 6.20 kg / 13.67 lbs
1 591 Gs
0.93 kg / 2.05 lbs
930 g / 9.1 N
5.58 kg / 12.31 lbs
~0 Gs
60 mm 3.36 kg / 7.41 lbs
1 171 Gs
0.50 kg / 1.11 lbs
504 g / 4.9 N
3.02 kg / 6.67 lbs
~0 Gs
70 mm 1.89 kg / 4.16 lbs
877 Gs
0.28 kg / 0.62 lbs
283 g / 2.8 N
1.70 kg / 3.74 lbs
~0 Gs
80 mm 1.10 kg / 2.42 lbs
669 Gs
0.16 kg / 0.36 lbs
165 g / 1.6 N
0.99 kg / 2.18 lbs
~0 Gs
90 mm 0.66 kg / 1.46 lbs
520 Gs
0.10 kg / 0.22 lbs
99 g / 1.0 N
0.60 kg / 1.31 lbs
~0 Gs
100 mm 0.41 kg / 0.91 lbs
410 Gs
0.06 kg / 0.14 lbs
62 g / 0.6 N
0.37 kg / 0.82 lbs
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MW 45x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 20.5 cm
Hearing aid 10 Gs (1.0 mT) 16.0 cm
Timepiece 20 Gs (2.0 mT) 12.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 10.0 cm
Remote 50 Gs (5.0 mT) 9.0 cm
Payment card 400 Gs (40.0 mT) 4.0 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm

Table 8: Collisions (kinetic energy) - collision effects
MW 45x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.09 km/h
(5.58 m/s)
2.79 J
30 mm 29.29 km/h
(8.14 m/s)
5.92 J
50 mm 37.23 km/h
(10.34 m/s)
9.57 J
100 mm 52.54 km/h
(14.59 m/s)
19.05 J

Table 9: Anti-corrosion coating durability
MW 45x15 / 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 (Flux)
MW 45x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 57 854 Mx 578.5 µWb
Pc Coefficient 0.44 Low (Flat)

Table 11: Hydrostatics and buoyancy
MW 45x15 / N38

Environment Effective steel pull Effect
Air (land) 48.55 kg Standard
Water (riverbed) 55.59 kg
(+7.04 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. Wall mount (shear)

*Note: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.44

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: 010070-2026
Measurement Calculator
Magnet pull force

Magnetic Induction

Other products

This product is an incredibly powerful cylindrical magnet, composed of durable NdFeB material, which, with dimensions of Ø45x15 mm, guarantees the highest energy density. This specific item features high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 48.55 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 476.32 N with a weight of only 178.92 g, this rod 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 precision component. To ensure long-term durability in industry, anaerobic resins 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 professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø45x15), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø45x15 mm, which, at a weight of 178.92 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 48.55 kg (force ~476.32 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 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. 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.

Advantages as well as disadvantages of neodymium magnets.

Benefits

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
  • They are extremely resistant to demagnetization induced by external field influence,
  • In other words, due to the smooth layer of nickel, the element gains visual value,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • In view of the ability of flexible shaping and customization to individualized projects, NdFeB magnets can be produced in a broad palette of forms and dimensions, which makes them more universal,
  • Key role in high-tech industry – they are commonly used in hard drives, electric motors, medical equipment, as well as complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons

Disadvantages of NdFeB magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their strength 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
  • 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 as well as corrosion.
  • Due to limitations in realizing nuts and complicated shapes in magnets, we propose using cover - magnetic holder.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting capacity of the magnetwhat it depends on?

The declared magnet strength represents the limit force, measured under ideal test conditions, namely:
  • on a base made of mild steel, optimally conducting the magnetic field
  • whose thickness equals approx. 10 mm
  • with a surface free of scratches
  • with zero gap (no paint)
  • for force applied at a right angle (in the magnet axis)
  • at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Bear in mind that the magnet holding will differ depending on the following factors, starting with the most relevant:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material composition – not every steel attracts identically. High carbon content worsen the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.

Precautions when working with NdFeB magnets
Handling rules

Handle with care. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can react.

Permanent damage

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

Threat to navigation

Remember: rare earth magnets generate a field that disrupts sensitive sensors. Keep a separation from your phone, device, and GPS.

Medical implants

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

Allergic reactions

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, refrain from direct skin contact or choose encased magnets.

Cards and drives

Powerful magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.

No play value

Only for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep away from kids and pets.

Crushing risk

Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Dust is flammable

Powder created during cutting of magnets is combustible. Do not drill into magnets unless you are an expert.

Fragile material

Watch out for shards. Magnets can explode upon violent connection, ejecting shards into the air. Eye protection is mandatory.

Important! Want to know more? Read our article: Are neodymium magnets dangerous?