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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 details »

84.45 ZŁ with VAT / pcs + price for transport

68.66 ZŁ net + 23% VAT / pcs

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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

Engineering analysis of the product - technical parameters

The following values represent the direct effect of a engineering simulation. Results are based on models for the class Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Treat these calculations as a reference point during assembly planning.

Table 1: Static force (force vs distance) - characteristics
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
 dangerous!
1 mm 3955 Gs
395.5 mT
 56.23 kg / 123.96 LBS
56228.7 g / 551.6 N
 dangerous!
2 mm 3786 Gs
378.6 mT
 51.51 kg / 113.57 LBS
51512.3 g / 505.3 N
 dangerous!
3 mm 3613 Gs
361.3 mT
 46.91 kg / 103.42 LBS
46911.0 g / 460.2 N
 dangerous!
5 mm 3263 Gs
326.3 mT
 38.28 kg / 84.40 LBS
38282.6 g / 375.6 N
 dangerous!
10 mm 2442 Gs
244.2 mT
 21.43 kg / 47.26 LBS
21434.6 g / 210.3 N
 dangerous!
15 mm 1776 Gs
177.6 mT
 11.34 kg / 25.00 LBS
11340.0 g / 111.2 N
 dangerous!
20 mm 1285 Gs
128.5 mT
 5.93 kg / 13.08 LBS
5932.8 g / 58.2 N
 medium risk
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
Pulling power weakens significantly per each millimeter of gap. Keep in mind that every additional insulation layer (e.g., contamination, varnish, dust) significantly weakens the grip. Magnets hold most effectively at the point of direct contact; gap weakens the power. Analyze how quickly the pull force drop, when the product does not touch flatly to the steel surface. When calculating the arrangement, discard redundant distances.

Table 2: Vertical load (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
This section presents the theoretical weight limit needed to start the shifting of the magnet down against a upright metal surface (considering typical friction). The holding force is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 hanging a element on a upright surface (e.g., a car body), it will maintain barely about 1/5 of its nominal power. Gravity as well as a low friction coefficient cause that holders slip easier than they pop off the substrate. Want to create a hanger? Note that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the element will slip down under a noticeably lighter weight. Utilizing a rubberized coating can significantly increase the grip.

Table 4: Steel thickness (saturation) - 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 too thin steel is unable to take in the full magnetic flux, which squanders power of the holder. Should you install a neodymium to a thin surface, the magnetism will pass right through and the holding will be smaller. To squeeze full efficiency of this neodymium's power, you require a sufficiently solid element of steel. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the magnet works worse. We advise picking the steel cross-section based on the following data.

Table 5: Thermal stability (stability) - resistance threshold
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 change their properties strength after exceeding the maximum temperature. Avoid high temperatures – heat can permanently damage this magnet. As the temperature rises, the magnet's power momentarily decreases. Do not use this product near heat sources higher than its operating temperature limit. Too high temperature will lead to irreversible degradation of magnetism.
*Important note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) may lose charge permanently sooner than taller cylinders. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 45x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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 magnets interact from a wider radius than a neodymium and metal combination. The connection of two magnets creates a more powerful interaction and a larger range of performance. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is extreme. The levitation is marginally weaker than the attraction, but still significant.
*Flux density between like poles drops to ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Important: Calculations refer to shear force of a pair of identical magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - 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
Mechanical watch 20 Gs (2.0 mT) 14.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 10.5 cm
Car key 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 is a large risk to electronics and pacemakers. These magnets generate a field that prevents correct functioning of digital equipment. Remember: the invisible magnetic field penetrates the body and housings. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
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
Neodymium magnets are delicate – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when playing 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 following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Total magnetic flux emitted by the pole surface. Key data for generator designers as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Shear force

*Caution: On a vertical surface, the magnet holds merely a fraction of its max power.

2. Steel thickness impact

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

3. Thermal stability

*For N38 material, 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.

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%
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
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The presented product is an exceptionally strong cylinder magnet, made from advanced NdFeB material, which, with dimensions of Ø45x20 mm, guarantees optimal power. This specific item boasts a tolerance of ±0.1mm and professional build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 60.94 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal 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 electronics and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, 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 industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are suitable for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest 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 warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 45 mm and height 20 mm. The key parameter here is the lifting capacity amounting to approximately 60.94 kg (force ~597.79 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 45 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 through the diameter if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Benefits

Besides their tremendous field intensity, neodymium magnets offer the following advantages:
  • They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • They maintain their magnetic properties even under close interference source,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Considering the option of precise shaping and customization to specialized requirements, NdFeB magnets can be produced in a broad palette of geometric configurations, which increases their versatility,
  • Fundamental importance in electronics industry – they are utilized in HDD drives, motor assemblies, diagnostic systems, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in compact constructions

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Due to limitations in realizing nuts and complex shapes in magnets, we recommend using cover - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Due to neodymium price, their price exceeds standard values,

Lifting parameters

Magnetic strength at its maximum – what it depends on?

The force parameter is a theoretical maximum value executed under the following configuration:
  • using a base made of high-permeability steel, acting as a circuit closing element
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a plane free of scratches
  • under conditions of no distance (surface-to-surface)
  • during detachment in a direction vertical to the mounting surface
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

It is worth knowing that the working load will differ subject to elements below, in order of importance:
  • Air gap (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – 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.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
  • Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

H&S for magnets
Combustion hazard

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

Pinching danger

Watch your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!

Thermal limits

Keep cool. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Shattering risk

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets will cause them cracking into shards.

Phone sensors

Note: neodymium magnets generate a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.

Keep away from computers

Intense magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.

This is not a toy

Always keep magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are very dangerous.

Allergic reactions

A percentage of the population experience a contact allergy to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact might lead to a rash. We strongly advise wear safety gloves.

Life threat

Life threat: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Handling rules

Before use, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

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