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MW 45x25 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010072

GTIN/EAN: 5906301810711

5.00

Diameter Ø

45 mm [±0,1 mm]

Height

25 mm [±0,1 mm]

Weight

298.21 g

Magnetization Direction

↑ axial

Load capacity

67.33 kg / 660.51 N

Magnetic Induction

460.72 mT / 4607 Gs

Coating

[NiCuNi] Nickel

product parameters »

101.55 ZŁ with VAT / pcs + price for transport

82.56 ZŁ net + 23% VAT / pcs

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Pick up the phone and ask +48 22 499 98 98 or get in touch through our online form our website.
Strength along with appearance of neodymium magnets can be verified with our force calculator.

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Physical properties - MW 45x25 / N38 - cylindrical magnet

Specification / characteristics - MW 45x25 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010072
GTIN/EAN 5906301810711
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 25 mm [±0,1 mm]
Weight 298.21 g
Magnetization Direction ↑ axial
Load capacity ~ ? 67.33 kg / 660.51 N
Magnetic Induction ~ ? 460.72 mT / 4607 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x25 / 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 analysis of the assembly - data

The following information are the result of a mathematical simulation. Values were calculated on algorithms for the material Nd2Fe14B. Actual performance may differ from theoretical values. Treat these data as a reference point for designers.

Table 1: Static force (pull vs gap) - characteristics
MW 45x25 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4606 Gs
460.6 mT
 67.33 kg / 148.44 pounds
67330.0 g / 660.5 N
 critical level
1 mm 4413 Gs
441.3 mT
 61.79 kg / 136.23 pounds
61791.4 g / 606.2 N
 critical level
2 mm 4214 Gs
421.4 mT
 56.35 kg / 124.22 pounds
56345.9 g / 552.8 N
 critical level
3 mm 4014 Gs
401.4 mT
 51.11 kg / 112.68 pounds
51112.0 g / 501.4 N
 critical level
5 mm 3615 Gs
361.5 mT
 41.47 kg / 91.42 pounds
41466.0 g / 406.8 N
 critical level
10 mm 2697 Gs
269.7 mT
 23.08 kg / 50.89 pounds
23083.9 g / 226.5 N
 critical level
15 mm 1965 Gs
196.5 mT
 12.25 kg / 27.00 pounds
12247.0 g / 120.1 N
 critical level
20 mm 1426 Gs
142.6 mT
 6.46 kg / 14.23 pounds
6455.7 g / 63.3 N
 medium risk
30 mm 778 Gs
77.8 mT
 1.92 kg / 4.24 pounds
1922.5 g / 18.9 N
 low risk
50 mm 285 Gs
28.5 mT
 0.26 kg / 0.57 pounds
257.0 g / 2.5 N
 low risk
Grip strength drops sharply with every subsequent millimeter of gap. Remember that even the smallest gap (e.g., contamination, varnish, dust) significantly diminishes the holding power. Neodymiums operate strongest during direct contact; air break weakens the force. See how flashily the parameters drop, when the product does not adhere tightly to the steel surface. When calculating the mounting, discard unnecessary gaps.

Table 2: Vertical capacity (wall)
MW 45x25 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 13.47 kg / 29.69 pounds
13466.0 g / 132.1 N
1 mm Stal (~0.2) 12.36 kg / 27.24 pounds
12358.0 g / 121.2 N
2 mm Stal (~0.2) 11.27 kg / 24.85 pounds
11270.0 g / 110.6 N
3 mm Stal (~0.2) 10.22 kg / 22.54 pounds
10222.0 g / 100.3 N
5 mm Stal (~0.2) 8.29 kg / 18.29 pounds
8294.0 g / 81.4 N
10 mm Stal (~0.2) 4.62 kg / 10.18 pounds
4616.0 g / 45.3 N
15 mm Stal (~0.2) 2.45 kg / 5.40 pounds
2450.0 g / 24.0 N
20 mm Stal (~0.2) 1.29 kg / 2.85 pounds
1292.0 g / 12.7 N
30 mm Stal (~0.2) 0.38 kg / 0.85 pounds
384.0 g / 3.8 N
50 mm Stal (~0.2) 0.05 kg / 0.11 pounds
52.0 g / 0.5 N
This section calculates the theoretical force sufficient to start the slippage of the magnet downwards along a vertical metal surface (assuming standard friction). The holding force is relative to the air gap between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 45x25 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
20.20 kg / 44.53 pounds
20199.0 g / 198.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
13.47 kg / 29.69 pounds
13466.0 g / 132.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
6.73 kg / 14.84 pounds
6733.0 g / 66.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
33.67 kg / 74.22 pounds
33665.0 g / 330.3 N
When mounting a magnet on a vertical plane (e.g., a board), it will only hold just approx. 20%-30% of its maximum pull force. Gravity and a weak degree of grip mean that magnets move down faster than they pop off the substrate. Want to create a vertical fastening? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a slippery surface, the magnet will give way down under a noticeably lighter weight. Utilizing a rubberized coating can drastically improve the result.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 45x25 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 2.24 kg / 4.95 pounds
2244.3 g / 22.0 N
1 mm
8%
 5.61 kg / 12.37 pounds
5610.8 g / 55.0 N
2 mm
17%
 11.22 kg / 24.74 pounds
11221.7 g / 110.1 N
3 mm
25%
 16.83 kg / 37.11 pounds
16832.5 g / 165.1 N
5 mm
42%
 28.05 kg / 61.85 pounds
28054.2 g / 275.2 N
10 mm
83%
 56.11 kg / 123.70 pounds
56108.3 g / 550.4 N
11 mm
92%
 61.72 kg / 136.07 pounds
61719.2 g / 605.5 N
12 mm
100%
 67.33 kg / 148.44 pounds
67330.0 g / 660.5 N
A thin sheet is not enough to absorb the full magnetic flux, which weakens actual performance of the magnet. If you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To squeeze full efficiency of this magnet's potential, you need a suitably thick piece of steel. The saturation effect causes that on delicate walls (e.g., car bodies), the holder holds weaker. We suggest choosing the steel cross-section from these parameters.

Table 5: Thermal stability (stability) - power drop
MW 45x25 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 67.33 kg / 148.44 pounds
67330.0 g / 660.5 N
 OK
40 °C -2.2% 65.85 kg / 145.17 pounds
65848.7 g / 646.0 N
 OK
60 °C -4.4% 64.37 kg / 141.91 pounds
64367.5 g / 631.4 N
 OK
80 °C -6.6% 62.89 kg / 138.64 pounds
62886.2 g / 616.9 N
100 °C -28.8% 47.94 kg / 105.69 pounds
47939.0 g / 470.3 N
Classic neodymiums lose power after exceeding the maximum temperature. Avoid high temperatures – excessive heat can irreversibly demagnetize this magnet. As the temperature rises, the magnet's force momentarily drops. Do not use this magnet in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will cause permanent loss of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently sooner than taller cylinders. Warning indicator in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 45x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 208.06 kg / 458.70 pounds
5 651 Gs
31.21 kg / 68.80 pounds
31209 g / 306.2 N
 N/A
1 mm 199.55 kg / 439.92 pounds
9 023 Gs
29.93 kg / 65.99 pounds
29932 g / 293.6 N
 179.59 kg / 395.93 pounds
~0 Gs
2 mm 190.95 kg / 420.96 pounds
8 826 Gs
28.64 kg / 63.14 pounds
28642 g / 281.0 N
 171.85 kg / 378.87 pounds
~0 Gs
3 mm 182.46 kg / 402.26 pounds
8 628 Gs
27.37 kg / 60.34 pounds
27369 g / 268.5 N
 164.22 kg / 362.03 pounds
~0 Gs
5 mm 165.94 kg / 365.83 pounds
8 228 Gs
24.89 kg / 54.87 pounds
24891 g / 244.2 N
 149.35 kg / 329.25 pounds
~0 Gs
10 mm 128.14 kg / 282.49 pounds
7 230 Gs
19.22 kg / 42.37 pounds
19221 g / 188.6 N
 115.32 kg / 254.24 pounds
~0 Gs
20 mm 71.33 kg / 157.26 pounds
5 394 Gs
10.70 kg / 23.59 pounds
10700 g / 105.0 N
 64.20 kg / 141.54 pounds
~0 Gs
50 mm 10.72 kg / 23.63 pounds
2 091 Gs
1.61 kg / 3.54 pounds
1608 g / 15.8 N
 9.65 kg / 21.26 pounds
~0 Gs
60 mm 5.94 kg / 13.10 pounds
1 557 Gs
0.89 kg / 1.96 pounds
891 g / 8.7 N
 5.35 kg / 11.79 pounds
~0 Gs
70 mm 3.41 kg / 7.52 pounds
1 180 Gs
0.51 kg / 1.13 pounds
512 g / 5.0 N
 3.07 kg / 6.77 pounds
~0 Gs
80 mm 2.03 kg / 4.48 pounds
910 Gs
0.30 kg / 0.67 pounds
305 g / 3.0 N
 1.83 kg / 4.03 pounds
~0 Gs
90 mm 1.25 kg / 2.76 pounds
714 Gs
0.19 kg / 0.41 pounds
188 g / 1.8 N
 1.13 kg / 2.48 pounds
~0 Gs
100 mm 0.79 kg / 1.75 pounds
569 Gs
0.12 kg / 0.26 pounds
119 g / 1.2 N
 0.71 kg / 1.58 pounds
~0 Gs
Two magnetic products interact from a significantly greater distance than a neodymium and metal setup. The setup of two magnets produces a massive flux and a wider radius of operation. Designing a solid fastener? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is extreme. The repulsion force is marginally weaker than the connection force, but still significant.
*Field value for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
Important: Results demonstrate shear force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - precautionary measures
MW 45x25 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 24.0 cm
Hearing aid 10 Gs (1.0 mT) 19.0 cm
Timepiece 20 Gs (2.0 mT) 14.5 cm
Mobile device 40 Gs (4.0 mT) 11.5 cm
Remote 50 Gs (5.0 mT) 10.5 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm
Extremely neodym field is a real danger to IT equipment and pacemakers. These neodymiums generate a field that disrupts operation of digital equipment. Be aware: the invisible magnetic field passes through tissues and plastic. Exceptional care must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MW 45x25 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.11 km/h
(5.03 m/s)
 3.77 J
30 mm 26.71 km/h
(7.42 m/s)
 8.21 J
50 mm 33.97 km/h
(9.43 m/s)
 13.27 J
100 mm 47.92 km/h
(13.31 m/s)
 26.42 J
NdFeB products are very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely becomes dangerous. Impact energy can cause material chips or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
MW 45x25 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MW 45x25 / N38

Parameter Value SI Unit / Description
Magnetic Flux 73 928 Mx 739.3 µWb
Pc Coefficient 0.63 High (Stable)
Total magnetic flux passing through the magnet pole. Essential parameter when building generators and motors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
MW 45x25 / N38

Environment Effective steel pull Effect
Air (land) 67.33 kg Standard
Water (riverbed) 77.09 kg
(+9.76 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.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.

2. Steel thickness impact

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

3. Temperature resistance

*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) = 0.63

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 and environmental data
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%
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: 010072-2026
Measurement Calculator
Force (pull)
Magnetic Field
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The offered product is an exceptionally strong rod magnet, made from advanced NdFeB material, which, with dimensions of Ø45x25 mm, guarantees maximum efficiency. This specific item features a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 67.33 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 660.51 N with a weight of only 298.21 g, this rod is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 45.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø45x25), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
This model is characterized by dimensions Ø45x25 mm, which, at a weight of 298.21 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 67.33 kg (force ~660.51 N), which, with such defined dimensions, proves the high power 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 45 mm. Such an arrangement is standard 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 through the diameter if your project requires it.

Advantages as well as disadvantages of neodymium magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (according to theory),
  • They retain their magnetic properties even under close interference source,
  • Thanks to the reflective finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an modern appearance,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of individual modeling and modifying to complex needs,
  • Universal use in future technologies – they serve a role in HDD drives, brushless drives, advanced medical instruments, also industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Characteristics of disadvantages of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of creating threads in the magnet and complex shapes - recommended is a housing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small components of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Detachment force of the magnet in optimal conditions – what it depends on?

The force parameter is a measurement result conducted under specific, ideal conditions:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • with a thickness of at least 10 mm
  • with a plane cleaned and smooth
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

In practice, the real power results from several key aspects, ranked from crucial:
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Plate material – mild steel attracts best. Higher carbon content reduce magnetic properties and lifting capacity.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature influence – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Risk of cracking

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. We recommend safety glasses.

Sensitization to coating

Studies show that nickel (standard magnet coating) is a potent allergen. For allergy sufferers, prevent touching magnets with bare hands or opt for encased magnets.

Physical harm

Big blocks can break fingers instantly. Do not put your hand betwixt two attracting surfaces.

Handling rules

Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Protect data

Device Safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, medical aids, mechanical watches).

Product not for children

Always store magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are life-threatening.

Flammability

Dust produced during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Implant safety

People with a ICD should maintain an large gap from magnets. The magnetism can interfere with the functioning of the implant.

GPS Danger

Note: rare earth magnets generate a field that interferes with precision electronics. Keep a safe distance from your phone, device, and navigation systems.

Heat sensitivity

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Important! More info about hazards in the article: Safety of working with magnets.