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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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Technical - 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 modeling of the magnet - technical parameters

These information constitute the result of a mathematical analysis. Values were calculated on algorithms for the material Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Use these data as a reference point for designers.

Table 1: Static pull force (pull vs gap) - 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 pounds
60940.0 g / 597.8 N
 critical level
1 mm 3955 Gs
395.5 mT
 56.23 kg / 123.96 pounds
56228.7 g / 551.6 N
 critical level
2 mm 3786 Gs
378.6 mT
 51.51 kg / 113.57 pounds
51512.3 g / 505.3 N
 critical level
3 mm 3613 Gs
361.3 mT
 46.91 kg / 103.42 pounds
46911.0 g / 460.2 N
 critical level
5 mm 3263 Gs
326.3 mT
 38.28 kg / 84.40 pounds
38282.6 g / 375.6 N
 critical level
10 mm 2442 Gs
244.2 mT
 21.43 kg / 47.26 pounds
21434.6 g / 210.3 N
 critical level
15 mm 1776 Gs
177.6 mT
 11.34 kg / 25.00 pounds
11340.0 g / 111.2 N
 critical level
20 mm 1285 Gs
128.5 mT
 5.93 kg / 13.08 pounds
5932.8 g / 58.2 N
 medium risk
30 mm 694 Gs
69.4 mT
 1.73 kg / 3.82 pounds
1730.8 g / 17.0 N
 weak grip
50 mm 249 Gs
24.9 mT
 0.22 kg / 0.49 pounds
222.3 g / 2.2 N
 weak grip
Pulling power weakens significantly per each millimeter of spacing. Remember that even a microscopic distance (e.g., dirt, paint, veneer) noticeably diminishes the holding power. Neodymiums work optimally at the point of direct contact; air break nullifies the force. Analyze how flashily the load capacity fall, when the product does not touch directly to the steel surface. When calculating the arrangement, discard additional spacers.

Table 2: Vertical 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 pounds
12188.0 g / 119.6 N
1 mm Stal (~0.2) 11.25 kg / 24.79 pounds
11246.0 g / 110.3 N
2 mm Stal (~0.2) 10.30 kg / 22.71 pounds
10302.0 g / 101.1 N
3 mm Stal (~0.2) 9.38 kg / 20.68 pounds
9382.0 g / 92.0 N
5 mm Stal (~0.2) 7.66 kg / 16.88 pounds
7656.0 g / 75.1 N
10 mm Stal (~0.2) 4.29 kg / 9.45 pounds
4286.0 g / 42.0 N
15 mm Stal (~0.2) 2.27 kg / 5.00 pounds
2268.0 g / 22.2 N
20 mm Stal (~0.2) 1.19 kg / 2.61 pounds
1186.0 g / 11.6 N
30 mm Stal (~0.2) 0.35 kg / 0.76 pounds
346.0 g / 3.4 N
50 mm Stal (~0.2) 0.04 kg / 0.10 pounds
44.0 g / 0.4 N
The following data shows the estimated holding capacity sufficient to initiate the downward movement of the magnet downwards against a vertical metal surface (considering standard friction coefficient). This parameter varies with the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
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 pounds
18282.0 g / 179.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
12.19 kg / 26.87 pounds
12188.0 g / 119.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
6.09 kg / 13.43 pounds
6094.0 g / 59.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
30.47 kg / 67.17 pounds
30470.0 g / 298.9 N
When hanging a element on a vertical wall (e.g., a fridge), it will only hold only about 1/5 of nominal attraction strength. Gravity as well as a weak degree of grip influence the fact that holders move down easier than they pull off. Designing a wall mount? Note that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the element will slip down under a significantly smaller cargo. Utilizing a rubberized pad can significantly improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 45x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 2.03 kg / 4.48 pounds
2031.3 g / 19.9 N
1 mm
8%
 5.08 kg / 11.20 pounds
5078.3 g / 49.8 N
2 mm
17%
 10.16 kg / 22.39 pounds
10156.7 g / 99.6 N
3 mm
25%
 15.24 kg / 33.59 pounds
15235.0 g / 149.5 N
5 mm
42%
 25.39 kg / 55.98 pounds
25391.7 g / 249.1 N
10 mm
83%
 50.78 kg / 111.96 pounds
50783.3 g / 498.2 N
11 mm
92%
 55.86 kg / 123.15 pounds
55861.7 g / 548.0 N
12 mm
100%
 60.94 kg / 134.35 pounds
60940.0 g / 597.8 N
A too thin steel is unable to absorb the full magnetic flux, which squanders power of the holder. If you mount a strong magnet to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To utilize the maximum of this neodymium's power, you require a sufficiently solid element of metal. The material oversaturation means that on thin elements (e.g., thin profiles), the magnet shows lower pull force. We suggest choosing the steel cross-section according to the table below.

Table 5: Working in heat (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 pounds
60940.0 g / 597.8 N
 OK
40 °C -2.2% 59.60 kg / 131.39 pounds
59599.3 g / 584.7 N
 OK
60 °C -4.4% 58.26 kg / 128.44 pounds
58258.6 g / 571.5 N
80 °C -6.6% 56.92 kg / 125.48 pounds
56918.0 g / 558.4 N
100 °C -28.8% 43.39 kg / 95.66 pounds
43389.3 g / 425.6 N
Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Watch out for overheating – high temperature can irreversibly demagnetize this product. As the temperature rises, the neodymium's power temporarily lowers. Avoid using this product in hot environments exceeding its operating temperature limit. Too high temperature will cause destruction of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) risk losing magnetic properties sooner than long magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 45x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 166.23 kg / 366.47 pounds
5 401 Gs
24.93 kg / 54.97 pounds
24934 g / 244.6 N
 N/A
1 mm 159.87 kg / 352.45 pounds
8 076 Gs
23.98 kg / 52.87 pounds
23980 g / 235.2 N
 143.88 kg / 317.20 pounds
~0 Gs
2 mm 153.38 kg / 338.14 pounds
7 910 Gs
23.01 kg / 50.72 pounds
23007 g / 225.7 N
 138.04 kg / 304.33 pounds
~0 Gs
3 mm 146.92 kg / 323.90 pounds
7 742 Gs
22.04 kg / 48.58 pounds
22038 g / 216.2 N
 132.23 kg / 291.51 pounds
~0 Gs
5 mm 134.19 kg / 295.83 pounds
7 399 Gs
20.13 kg / 44.37 pounds
20128 g / 197.5 N
 120.77 kg / 266.25 pounds
~0 Gs
10 mm 104.43 kg / 230.22 pounds
6 527 Gs
15.66 kg / 34.53 pounds
15664 g / 153.7 N
 93.98 kg / 207.20 pounds
~0 Gs
20 mm 58.47 kg / 128.90 pounds
4 884 Gs
8.77 kg / 19.34 pounds
8770 g / 86.0 N
 52.62 kg / 116.01 pounds
~0 Gs
50 mm 8.61 kg / 18.98 pounds
1 874 Gs
1.29 kg / 2.85 pounds
1291 g / 12.7 N
 7.75 kg / 17.08 pounds
~0 Gs
60 mm 4.72 kg / 10.41 pounds
1 388 Gs
0.71 kg / 1.56 pounds
708 g / 6.9 N
 4.25 kg / 9.37 pounds
~0 Gs
70 mm 2.68 kg / 5.91 pounds
1 046 Gs
0.40 kg / 0.89 pounds
402 g / 3.9 N
 2.41 kg / 5.32 pounds
~0 Gs
80 mm 1.58 kg / 3.48 pounds
803 Gs
0.24 kg / 0.52 pounds
237 g / 2.3 N
 1.42 kg / 3.14 pounds
~0 Gs
90 mm 0.96 kg / 2.12 pounds
627 Gs
0.14 kg / 0.32 pounds
145 g / 1.4 N
 0.87 kg / 1.91 pounds
~0 Gs
100 mm 0.61 kg / 1.34 pounds
497 Gs
0.09 kg / 0.20 pounds
91 g / 0.9 N
 0.55 kg / 1.20 pounds
~0 Gs
Two strong neodymiums interact from a significantly greater distance than a magnet and sheet combination. The connection of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Planning to create a solid fastener? Use a pair of magnets instead of a neodymium and a steel. Be careful that when bringing together two magnets, the impact force is huge. The repulsion force is a bit weaker than the connection force, but still impressive.
*The magnetic induction for N-N configuration reaches ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Important: Figures apply to sliding force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (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
Powerful magnet radiation poses a serious hazard to electronics and medical implants. These magnets generate a field that destroys function of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and glass. Increased vigilance must be taken by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Collisions (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
Neodymium magnets are delicate – a violent impact against metal risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Kinetic force can cause material chips or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when working with large magnets.

Table 9: Corrosion resistance
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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction 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 emitted by the magnet pole. Key data in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Note: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

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

3. Thermal stability

*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) = 0.54

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
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%
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: 010071-2026
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Force (pull)
Field Strength
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The presented product is an extremely powerful cylindrical magnet, produced from advanced NdFeB material, which, at dimensions of Ø45x20 mm, guarantees maximum efficiency. This specific item is characterized by a tolerance of ±0.1mm and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 60.94 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields 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 597.79 N with a weight of only 238.56 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø45x20), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 45 mm and height 20 mm. The value of 597.79 N means that the magnet is capable of holding a weight many times exceeding its own mass of 238.56 g. 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.

Strengths and weaknesses of rare earth magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have constant strength, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • Magnets perfectly defend themselves against demagnetization caused by foreign field sources,
  • In other words, due to the smooth layer of gold, the element gains a professional look,
  • Magnetic induction on the surface of the magnet is strong,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
  • Possibility of accurate creating as well as adapting to individual conditions,
  • Significant place in innovative solutions – they are used in magnetic memories, electric motors, medical equipment, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in compact constructions

Limitations

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited ability of creating nuts in the magnet and complex forms - recommended is a housing - magnet mounting.
  • Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these products are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

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

The declared magnet strength refers to the maximum value, obtained under optimal environment, namely:
  • with the use of a yoke made of special test steel, ensuring full magnetic saturation
  • with a cross-section minimum 10 mm
  • characterized by lack of roughness
  • with total lack of distance (without impurities)
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Determinants of practical lifting force of a magnet

Real force is influenced by specific conditions, such as (from priority):
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Plate thickness – insufficiently thick sheet does not close the flux, causing part of the power to be wasted into the air.
  • Chemical composition of the base – mild steel attracts best. Alloy steels reduce magnetic properties and holding force.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet’s surface and the plate lowers the holding force.

H&S for magnets
Electronic hazard

Device Safety: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Beware of splinters

NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them breaking into small pieces.

Precision electronics

Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Machining danger

Dust generated during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Keep away from children

NdFeB magnets are not suitable for play. Accidental ingestion of several magnets can lead to them attracting across intestines, which poses a direct threat to life and necessitates immediate surgery.

Demagnetization risk

Regular neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Warning for heart patients

Individuals with a heart stimulator should maintain an absolute distance from magnets. The magnetism can interfere with the functioning of the implant.

Allergic reactions

Some people experience a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Frequent touching can result in an allergic reaction. It is best to use safety gloves.

Caution required

Use magnets consciously. Their powerful strength can surprise even experienced users. Stay alert and do not underestimate their force.

Physical harm

Protect your hands. Two powerful magnets will snap together immediately with a force of massive weight, crushing everything in their path. Be careful!

Warning! Learn more about hazards in the article: Safety of working with magnets.