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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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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 simulation of the product - data

These data are the outcome of a physical simulation. Values rely on models for the class Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs distance) - 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 lbs
67330.0 g / 660.5 N
 critical level
1 mm 4413 Gs
441.3 mT
 61.79 kg / 136.23 lbs
61791.4 g / 606.2 N
 critical level
2 mm 4214 Gs
421.4 mT
 56.35 kg / 124.22 lbs
56345.9 g / 552.8 N
 critical level
3 mm 4014 Gs
401.4 mT
 51.11 kg / 112.68 lbs
51112.0 g / 501.4 N
 critical level
5 mm 3615 Gs
361.5 mT
 41.47 kg / 91.42 lbs
41466.0 g / 406.8 N
 critical level
10 mm 2697 Gs
269.7 mT
 23.08 kg / 50.89 lbs
23083.9 g / 226.5 N
 critical level
15 mm 1965 Gs
196.5 mT
 12.25 kg / 27.00 lbs
12247.0 g / 120.1 N
 critical level
20 mm 1426 Gs
142.6 mT
 6.46 kg / 14.23 lbs
6455.7 g / 63.3 N
 warning
30 mm 778 Gs
77.8 mT
 1.92 kg / 4.24 lbs
1922.5 g / 18.9 N
 safe
50 mm 285 Gs
28.5 mT
 0.26 kg / 0.57 lbs
257.0 g / 2.5 N
 safe
Magnetic force drops drastically with every mm of gap. Remember that even the smallest gap (e.g., dirt, paint, veneer) noticeably reduces the pull force. Neodymiums work most effectively during direct contact; gap nullifies the force. Analyze how flashily the load capacity drop, when the magnet does not adhere tightly to the metal substrate. When designing the assembly, discard additional spacers.

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

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

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 lbs
20199.0 g / 198.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
13.47 kg / 29.69 lbs
13466.0 g / 132.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
6.73 kg / 14.84 lbs
6733.0 g / 66.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
33.67 kg / 74.22 lbs
33665.0 g / 330.3 N
When mounting a holder on a upright plane (e.g., a board), it will only hold only approx. 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip cause that holders move down faster than they pop off the substrate. Planning a wall mount? Consider that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the magnet will slip down under a noticeably lighter cargo. Using a rubber layer can significantly 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 lbs
2244.3 g / 22.0 N
1 mm
8%
 5.61 kg / 12.37 lbs
5610.8 g / 55.0 N
2 mm
17%
 11.22 kg / 24.74 lbs
11221.7 g / 110.1 N
3 mm
25%
 16.83 kg / 37.11 lbs
16832.5 g / 165.1 N
5 mm
42%
 28.05 kg / 61.85 lbs
28054.2 g / 275.2 N
10 mm
83%
 56.11 kg / 123.70 lbs
56108.3 g / 550.4 N
11 mm
92%
 61.72 kg / 136.07 lbs
61719.2 g / 605.5 N
12 mm
100%
 67.33 kg / 148.44 lbs
67330.0 g / 660.5 N
A thin sheet is incapable of focus the entire magnetic field, which wastes potential of the holder. Should you mount a strong magnet to a thin surface, the field will penetrate right through and the pull force will drop sharply. To achieve 100% of this neodymium's power, you require a sufficiently solid piece of metal. The saturation phenomenon causes that on thin elements (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal stability (stability) - resistance threshold
MW 45x25 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 67.33 kg / 148.44 lbs
67330.0 g / 660.5 N
 OK
40 °C -2.2% 65.85 kg / 145.17 lbs
65848.7 g / 646.0 N
 OK
60 °C -4.4% 64.37 kg / 141.91 lbs
64367.5 g / 631.4 N
 OK
80 °C -6.6% 62.89 kg / 138.64 lbs
62886.2 g / 616.9 N
100 °C -28.8% 47.94 kg / 105.69 lbs
47939.0 g / 470.3 N
Ordinary NdFeB products change their properties parameters above the temperature limit. Protect against heat – high temperature can permanently demagnetize this magnet. With every degree above norm, the magnet's power temporarily decreases. Do not use this product near heat sources exceeding its safe range. Ignoring the limit will lead to permanent loss of magnetism.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 45x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 208.06 kg / 458.70 lbs
5 651 Gs
31.21 kg / 68.80 lbs
31209 g / 306.2 N
 N/A
1 mm 199.55 kg / 439.92 lbs
9 023 Gs
29.93 kg / 65.99 lbs
29932 g / 293.6 N
 179.59 kg / 395.93 lbs
~0 Gs
2 mm 190.95 kg / 420.96 lbs
8 826 Gs
28.64 kg / 63.14 lbs
28642 g / 281.0 N
 171.85 kg / 378.87 lbs
~0 Gs
3 mm 182.46 kg / 402.26 lbs
8 628 Gs
27.37 kg / 60.34 lbs
27369 g / 268.5 N
 164.22 kg / 362.03 lbs
~0 Gs
5 mm 165.94 kg / 365.83 lbs
8 228 Gs
24.89 kg / 54.87 lbs
24891 g / 244.2 N
 149.35 kg / 329.25 lbs
~0 Gs
10 mm 128.14 kg / 282.49 lbs
7 230 Gs
19.22 kg / 42.37 lbs
19221 g / 188.6 N
 115.32 kg / 254.24 lbs
~0 Gs
20 mm 71.33 kg / 157.26 lbs
5 394 Gs
10.70 kg / 23.59 lbs
10700 g / 105.0 N
 64.20 kg / 141.54 lbs
~0 Gs
50 mm 10.72 kg / 23.63 lbs
2 091 Gs
1.61 kg / 3.54 lbs
1608 g / 15.8 N
 9.65 kg / 21.26 lbs
~0 Gs
60 mm 5.94 kg / 13.10 lbs
1 557 Gs
0.89 kg / 1.96 lbs
891 g / 8.7 N
 5.35 kg / 11.79 lbs
~0 Gs
70 mm 3.41 kg / 7.52 lbs
1 180 Gs
0.51 kg / 1.13 lbs
512 g / 5.0 N
 3.07 kg / 6.77 lbs
~0 Gs
80 mm 2.03 kg / 4.48 lbs
910 Gs
0.30 kg / 0.67 lbs
305 g / 3.0 N
 1.83 kg / 4.03 lbs
~0 Gs
90 mm 1.25 kg / 2.76 lbs
714 Gs
0.19 kg / 0.41 lbs
188 g / 1.8 N
 1.13 kg / 2.48 lbs
~0 Gs
100 mm 0.79 kg / 1.75 lbs
569 Gs
0.12 kg / 0.26 lbs
119 g / 1.2 N
 0.71 kg / 1.58 lbs
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and sheet setup. The connection of two magnets produces a massive flux and a larger range of action. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the collision energy is huge. The levitation is marginally weaker than the attraction, but still large.
*Flux density between like poles drops to ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Note: Calculations show friction force of dual identical magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - warnings
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
A strong magnetic field poses a large risk to electronics as well as medical implants. These magnets generate a flux that prevents correct functioning of digital equipment. Notice: the invisible magnetic field passes through tissues and plastic. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - 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
Magnetic elements are delicate – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear safety glasses when playing with large magnets.

Table 9: Anti-corrosion coating durability
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 emitted by the pole surface. Essential parameter for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Shear force

*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Thermal stability

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.63

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.

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%
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: 010072-2026
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The presented product is a very strong rod magnet, manufactured from modern NdFeB material, which, with dimensions of Ø45x25 mm, guarantees optimal power. The MW 45x25 / N38 component boasts a tolerance of ±0.1mm and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 67.33 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 660.51 N with a weight of only 298.21 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. 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 the majority 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 (Ø45x25), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
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 compact dimensions, proves the high grade 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 25 mm), which means that the N and S poles are located on the flat, circular surfaces. 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.

Strengths and weaknesses of rare earth magnets.

Benefits

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain attractive force for nearly 10 years – the drop is just ~1% (in theory),
  • They feature excellent resistance to weakening of magnetic properties due to opposing magnetic fields,
  • By covering with a decorative coating of gold, the element has an professional look,
  • Magnetic induction on the top side of the magnet turns out to be impressive,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of detailed shaping as well as adjusting to complex requirements,
  • Wide application in modern technologies – they serve a role in magnetic memories, brushless drives, medical devices, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in compact constructions

Weaknesses

Problematic aspects of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making threads in the magnet and complicated forms - recommended is casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting capacity of the magnet – what it depends on?

The specified lifting capacity concerns the peak performance, recorded under laboratory conditions, meaning:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a surface perfectly flat
  • under conditions of ideal adhesion (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Practical aspects of lifting capacity – factors

In real-world applications, the real power depends on a number of factors, ranked from most significant:
  • Clearance – existence of any layer (paint, tape, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
  • Load vector – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Steel grade – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Thermal conditions – 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, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safe handling of neodymium magnets
Finger safety

Large magnets can break fingers instantly. Under no circumstances put your hand between two attracting surfaces.

Heat sensitivity

Control the heat. Heating the magnet to high heat will destroy its properties and strength.

Fragile material

Watch out for shards. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.

Sensitization to coating

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

No play value

Only for adults. Tiny parts can be swallowed, leading to intestinal necrosis. Store out of reach of children and animals.

Electronic hazard

Do not bring magnets close to a wallet, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.

Respect the power

Be careful. Neodymium magnets attract from a distance and snap with huge force, often faster than you can react.

Flammability

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Phone sensors

Note: neodymium magnets generate a field that disrupts sensitive sensors. Keep a separation from your phone, device, and navigation systems.

Medical interference

Individuals with a pacemaker have to maintain an absolute distance from magnets. The magnetism can stop the operation of the life-saving device.

Warning! Need more info? Read our article: Are neodymium magnets dangerous?