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MW 45x20 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010071

GTIN/EAN: 5906301810704

5.00

Diameter Ø

45 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

238.56 g

Magnetization Direction

↑ axial

Load capacity

60.94 kg / 597.79 N

Magnetic Induction

411.81 mT / 4118 Gs

Coating

[NiCuNi] Nickel

technical specifications »

84.45 ZŁ with VAT / pcs + price for transport

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Product card - MW 45x20 / N38 - cylindrical magnet

Specification / characteristics - MW 45x20 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010071
GTIN/EAN 5906301810704
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 20 mm [±0,1 mm]
Weight 238.56 g
Magnetization Direction ↑ axial
Load capacity ~ ? 60.94 kg / 597.79 N
Magnetic Induction ~ ? 411.81 mT / 4118 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x20 / 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 product - data

Presented values are the result of a mathematical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Please consider these data as a reference point for designers.

Table 1: Static force (force vs gap) - power drop
MW 45x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4117 Gs
411.7 mT
 60.94 kg / 134.35 LBS
60940.0 g / 597.8 N
 crushing
1 mm 3955 Gs
395.5 mT
 56.23 kg / 123.96 LBS
56228.7 g / 551.6 N
 crushing
2 mm 3786 Gs
378.6 mT
 51.51 kg / 113.57 LBS
51512.3 g / 505.3 N
 crushing
3 mm 3613 Gs
361.3 mT
 46.91 kg / 103.42 LBS
46911.0 g / 460.2 N
 crushing
5 mm 3263 Gs
326.3 mT
 38.28 kg / 84.40 LBS
38282.6 g / 375.6 N
 crushing
10 mm 2442 Gs
244.2 mT
 21.43 kg / 47.26 LBS
21434.6 g / 210.3 N
 crushing
15 mm 1776 Gs
177.6 mT
 11.34 kg / 25.00 LBS
11340.0 g / 111.2 N
 crushing
20 mm 1285 Gs
128.5 mT
 5.93 kg / 13.08 LBS
5932.8 g / 58.2 N
 strong
30 mm 694 Gs
69.4 mT
 1.73 kg / 3.82 LBS
1730.8 g / 17.0 N
 weak grip
50 mm 249 Gs
24.9 mT
 0.22 kg / 0.49 LBS
222.3 g / 2.2 N
 weak grip
Magnetic force weakens drastically with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., dirt, paint, veneer) noticeably diminishes the holding power. Neodymiums work optimally in perfect adhesion; air break weakens the power. See how flashily the parameters fall, when the magnet does not adhere tightly to the steel surface. When calculating the arrangement, eliminate unnecessary gaps.

Table 2: Sliding hold (vertical surface)
MW 45x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 12.19 kg / 26.87 LBS
12188.0 g / 119.6 N
1 mm Stal (~0.2) 11.25 kg / 24.79 LBS
11246.0 g / 110.3 N
2 mm Stal (~0.2) 10.30 kg / 22.71 LBS
10302.0 g / 101.1 N
3 mm Stal (~0.2) 9.38 kg / 20.68 LBS
9382.0 g / 92.0 N
5 mm Stal (~0.2) 7.66 kg / 16.88 LBS
7656.0 g / 75.1 N
10 mm Stal (~0.2) 4.29 kg / 9.45 LBS
4286.0 g / 42.0 N
15 mm Stal (~0.2) 2.27 kg / 5.00 LBS
2268.0 g / 22.2 N
20 mm Stal (~0.2) 1.19 kg / 2.61 LBS
1186.0 g / 11.6 N
30 mm Stal (~0.2) 0.35 kg / 0.76 LBS
346.0 g / 3.4 N
50 mm Stal (~0.2) 0.04 kg / 0.10 LBS
44.0 g / 0.4 N
The table below calculates the theoretical shear load needed to cause the sliding of the magnet down on a vertical metal surface (assuming standard friction). The holding force varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MW 45x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
18.28 kg / 40.30 LBS
18282.0 g / 179.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
12.19 kg / 26.87 LBS
12188.0 g / 119.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
6.09 kg / 13.43 LBS
6094.0 g / 59.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
30.47 kg / 67.17 LBS
30470.0 g / 298.9 N
When mounting a element on a vertical surface (e.g., a fridge), it will only hold only about 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that magnets slide down faster than they detach. Designing a wall mount? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the magnet will slide down under a noticeably lighter load. Utilizing a rubberized pad can significantly improve the result.

Table 4: Material efficiency (substrate influence) - power losses
MW 45x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 2.03 kg / 4.48 LBS
2031.3 g / 19.9 N
1 mm
8%
 5.08 kg / 11.20 LBS
5078.3 g / 49.8 N
2 mm
17%
 10.16 kg / 22.39 LBS
10156.7 g / 99.6 N
3 mm
25%
 15.24 kg / 33.59 LBS
15235.0 g / 149.5 N
5 mm
42%
 25.39 kg / 55.98 LBS
25391.7 g / 249.1 N
10 mm
83%
 50.78 kg / 111.96 LBS
50783.3 g / 498.2 N
11 mm
92%
 55.86 kg / 123.15 LBS
55861.7 g / 548.0 N
12 mm
100%
 60.94 kg / 134.35 LBS
60940.0 g / 597.8 N
A thin metal plate is unable to conduct the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a too thin substrate, the flux will pass right through and the holding will be smaller. To squeeze the maximum of this magnet's potential, you need a suitably thick piece of steel. The material oversaturation means that on sheet metal structures (e.g., car bodies), the product holds weaker. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal resistance (material behavior) - power drop
MW 45x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 60.94 kg / 134.35 LBS
60940.0 g / 597.8 N
 OK
40 °C -2.2% 59.60 kg / 131.39 LBS
59599.3 g / 584.7 N
 OK
60 °C -4.4% 58.26 kg / 128.44 LBS
58258.6 g / 571.5 N
80 °C -6.6% 56.92 kg / 125.48 LBS
56918.0 g / 558.4 N
100 °C -28.8% 43.39 kg / 95.66 LBS
43389.3 g / 425.6 N
Standard neodymium magnets irreversibly lose parameters above the temperature limit. Watch out for overheating – heat can irreversibly damage this product. With every degree above norm, the magnet's power momentarily lowers. Refrain from using this product close to heaters higher than its safe range. Ignoring the limit will cause destruction of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress compared to rod magnets. Red status in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 45x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 166.23 kg / 366.47 LBS
5 401 Gs
24.93 kg / 54.97 LBS
24934 g / 244.6 N
 N/A
1 mm 159.87 kg / 352.45 LBS
8 076 Gs
23.98 kg / 52.87 LBS
23980 g / 235.2 N
 143.88 kg / 317.20 LBS
~0 Gs
2 mm 153.38 kg / 338.14 LBS
7 910 Gs
23.01 kg / 50.72 LBS
23007 g / 225.7 N
 138.04 kg / 304.33 LBS
~0 Gs
3 mm 146.92 kg / 323.90 LBS
7 742 Gs
22.04 kg / 48.58 LBS
22038 g / 216.2 N
 132.23 kg / 291.51 LBS
~0 Gs
5 mm 134.19 kg / 295.83 LBS
7 399 Gs
20.13 kg / 44.37 LBS
20128 g / 197.5 N
 120.77 kg / 266.25 LBS
~0 Gs
10 mm 104.43 kg / 230.22 LBS
6 527 Gs
15.66 kg / 34.53 LBS
15664 g / 153.7 N
 93.98 kg / 207.20 LBS
~0 Gs
20 mm 58.47 kg / 128.90 LBS
4 884 Gs
8.77 kg / 19.34 LBS
8770 g / 86.0 N
 52.62 kg / 116.01 LBS
~0 Gs
50 mm 8.61 kg / 18.98 LBS
1 874 Gs
1.29 kg / 2.85 LBS
1291 g / 12.7 N
 7.75 kg / 17.08 LBS
~0 Gs
60 mm 4.72 kg / 10.41 LBS
1 388 Gs
0.71 kg / 1.56 LBS
708 g / 6.9 N
 4.25 kg / 9.37 LBS
~0 Gs
70 mm 2.68 kg / 5.91 LBS
1 046 Gs
0.40 kg / 0.89 LBS
402 g / 3.9 N
 2.41 kg / 5.32 LBS
~0 Gs
80 mm 1.58 kg / 3.48 LBS
803 Gs
0.24 kg / 0.52 LBS
237 g / 2.3 N
 1.42 kg / 3.14 LBS
~0 Gs
90 mm 0.96 kg / 2.12 LBS
627 Gs
0.14 kg / 0.32 LBS
145 g / 1.4 N
 0.87 kg / 1.91 LBS
~0 Gs
100 mm 0.61 kg / 1.34 LBS
497 Gs
0.09 kg / 0.20 LBS
91 g / 0.9 N
 0.55 kg / 1.20 LBS
~0 Gs
Two magnetic products interact from a significantly greater distance than a neodymium and metal combination. The setup of magnet-to-magnet generates a stronger field and a wider radius of operation. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is extreme. The levitation is slightly lower than the attraction, but still impressive.
*Field value between like poles is approximately ~0 Gs at the geometric center of the gap (resulting from vector opposition).
* Calculations demonstrate shear force of two identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - precautionary measures
MW 45x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 22.5 cm
Hearing aid 10 Gs (1.0 mT) 17.5 cm
Timepiece 20 Gs (2.0 mT) 14.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 10.5 cm
Remote 50 Gs (5.0 mT) 10.0 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 real danger to IT equipment and medical implants. These neodymiums generate a flux that disrupts operation of digital equipment. Be aware: the invisible magnetic field penetrates the body and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MW 45x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.34 km/h
(5.37 m/s)
 3.44 J
30 mm 28.41 km/h
(7.89 m/s)
 7.43 J
50 mm 36.12 km/h
(10.03 m/s)
 12.01 J
100 mm 50.98 km/h
(14.16 m/s)
 23.92 J
Magnetic elements are delicate – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or painful pinches to fingers. Always hold the magnet during bringing near metal so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Coating parameters (durability)
MW 45x20 / 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 45x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 66 952 Mx 669.5 µWb
Pc Coefficient 0.54 Low (Flat)
Flux value passing through the pole surface. Key data in coil applications as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 45x20 / N38

Environment Effective steel pull Effect
Air (land) 60.94 kg Standard
Water (riverbed) 69.78 kg
(+8.84 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Sliding resistance

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

2. Steel thickness impact

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Temperature resistance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.54

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
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%
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: 010071-2026
Measurement Calculator
Pulling force
Field Strength
Insert a value in one of the inputs, and all other values change on the fly.

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The presented product is an exceptionally strong rod magnet, made from modern NdFeB material, which, at dimensions of Ø45x20 mm, guarantees maximum efficiency. This specific item boasts high dimensional repeatability and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 60.94 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 597.79 N with a weight of only 238.56 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
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 stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability 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 even stronger magnets in the same volume (Ø45x20), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 45 mm and height 20 mm. The key parameter here is the holding force amounting to approximately 60.94 kg (force ~597.79 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 20 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 diametrically if your project requires it.

Strengths and weaknesses of rare earth magnets.

Benefits

Apart from their superior power, neodymium magnets have these key benefits:
  • Their strength is durable, and after approximately 10 years it decreases only by ~1% (theoretically),
  • They do not lose their magnetic properties even under close interference source,
  • The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They show high magnetic induction at the operating surface, making them more effective,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Due to the potential of flexible shaping and customization to custom requirements, NdFeB magnets can be modeled in a variety of geometric configurations, which amplifies use scope,
  • Fundamental importance in modern industrial fields – they serve a role in HDD drives, electric drive systems, precision medical tools, as well as complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Cons

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • They are fragile 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
  • When exposed to high temperature, neodymium magnets experience a drop in force. 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
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complex shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Furthermore, small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Magnetic strength at its maximum – what affects it?

The force parameter is a result of laboratory testing performed under standard conditions:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • without any clearance between the magnet and steel
  • under vertical force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

It is worth knowing that the magnet holding will differ influenced by elements below, in order of importance:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick steel does not accept the full field, causing part of the power to be wasted to the other side.
  • Steel type – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
  • Plate texture – smooth surfaces ensure maximum contact, which increases force. Uneven metal 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).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Warnings
Heat warning

Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Shattering risk

Despite the nickel coating, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Medical implants

Individuals with a ICD have to maintain an absolute distance from magnets. The magnetic field can stop the functioning of the life-saving device.

Compass and GPS

A powerful magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Maintain magnets near a device to prevent damaging the sensors.

Safe operation

Use magnets with awareness. Their powerful strength can surprise even experienced users. Stay alert and respect their power.

Mechanical processing

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

Adults only

Only for adults. Tiny parts can be swallowed, leading to severe trauma. Store away from kids and pets.

Nickel coating and allergies

Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness occurs, immediately stop working with magnets and wear gloves.

Hand protection

Big blocks can break fingers in a fraction of a second. Never place your hand betwixt two strong magnets.

Protect data

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

Warning! Looking for details? Read our article: Why are neodymium magnets dangerous?