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MW 45x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010073

GTIN/EAN: 5906301810728

Diameter Ø

45 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

357.85 g

Magnetization Direction

↑ axial

Load capacity

69.46 kg / 681.39 N

Magnetic Induction

495.87 mT / 4959 Gs

Coating

[NiCuNi] Nickel

technical parameters »

136.80 ZŁ with VAT / pcs + price for transport

111.22 ZŁ net + 23% VAT / pcs

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Physical properties - MW 45x30 / N38 - cylindrical magnet

Specification / characteristics - MW 45x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010073
GTIN/EAN 5906301810728
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 30 mm [±0,1 mm]
Weight 357.85 g
Magnetization Direction ↑ axial
Load capacity ~ ? 69.46 kg / 681.39 N
Magnetic Induction ~ ? 495.87 mT / 4959 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x30 / 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

Technical modeling of the magnet - report

Presented data are the result of a engineering analysis. Values were calculated on algorithms for the class Nd2Fe14B. Actual parameters may differ. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MW 45x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4958 Gs
495.8 mT
 69.46 kg / 153.13 pounds
69460.0 g / 681.4 N
 critical level
1 mm 4742 Gs
474.2 mT
 63.55 kg / 140.11 pounds
63553.9 g / 623.5 N
 critical level
2 mm 4523 Gs
452.3 mT
 57.81 kg / 127.44 pounds
57805.8 g / 567.1 N
 critical level
3 mm 4303 Gs
430.3 mT
 52.33 kg / 115.36 pounds
52327.7 g / 513.3 N
 critical level
5 mm 3870 Gs
387.0 mT
 42.33 kg / 93.32 pounds
42329.9 g / 415.3 N
 critical level
10 mm 2886 Gs
288.6 mT
 23.53 kg / 51.88 pounds
23531.8 g / 230.8 N
 critical level
15 mm 2106 Gs
210.6 mT
 12.54 kg / 27.64 pounds
12537.0 g / 123.0 N
 critical level
20 mm 1535 Gs
153.5 mT
 6.66 kg / 14.68 pounds
6657.1 g / 65.3 N
 medium risk
30 mm 845 Gs
84.5 mT
 2.02 kg / 4.45 pounds
2018.9 g / 19.8 N
 medium risk
50 mm 315 Gs
31.5 mT
 0.28 kg / 0.62 pounds
279.5 g / 2.7 N
 safe
Magnetic force weakens drastically per each millimeter of spacing. Remember that every additional insulation layer (e.g., contamination, paint, veneer) noticeably reduces the pull force. Magnetic products operate optimally during direct contact; gap kills the power. See how flashily the pull force plummet, when the magnet does not touch directly to the steel surface. When calculating the assembly, eliminate redundant distances.

Table 2: Slippage force (wall)
MW 45x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 13.89 kg / 30.63 pounds
13892.0 g / 136.3 N
1 mm Stal (~0.2) 12.71 kg / 28.02 pounds
12710.0 g / 124.7 N
2 mm Stal (~0.2) 11.56 kg / 25.49 pounds
11562.0 g / 113.4 N
3 mm Stal (~0.2) 10.47 kg / 23.07 pounds
10466.0 g / 102.7 N
5 mm Stal (~0.2) 8.47 kg / 18.66 pounds
8466.0 g / 83.1 N
10 mm Stal (~0.2) 4.71 kg / 10.37 pounds
4706.0 g / 46.2 N
15 mm Stal (~0.2) 2.51 kg / 5.53 pounds
2508.0 g / 24.6 N
20 mm Stal (~0.2) 1.33 kg / 2.94 pounds
1332.0 g / 13.1 N
30 mm Stal (~0.2) 0.40 kg / 0.89 pounds
404.0 g / 4.0 N
50 mm Stal (~0.2) 0.06 kg / 0.12 pounds
56.0 g / 0.5 N
This section calculates the theoretical holding capacity sufficient to cause the sliding of the magnet vertically on a upright steel plate (considering typical friction). This parameter depends on the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MW 45x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
20.84 kg / 45.94 pounds
20838.0 g / 204.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
13.89 kg / 30.63 pounds
13892.0 g / 136.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
6.95 kg / 15.31 pounds
6946.0 g / 68.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
34.73 kg / 76.57 pounds
34730.0 g / 340.7 N
When hanging a magnet on a vertical surface (e.g., a board), it will only hold only about 20%-30% of its maximum pull force. Gravitational force as well as a low friction coefficient cause that products slide down easier than they pull off. Want to create a wall mount? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a much lighter cargo. Application of an anti-slip coating can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MW 45x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 2.32 kg / 5.10 pounds
2315.3 g / 22.7 N
1 mm
8%
 5.79 kg / 12.76 pounds
5788.3 g / 56.8 N
2 mm
17%
 11.58 kg / 25.52 pounds
11576.7 g / 113.6 N
3 mm
25%
 17.37 kg / 38.28 pounds
17365.0 g / 170.4 N
5 mm
42%
 28.94 kg / 63.81 pounds
28941.7 g / 283.9 N
10 mm
83%
 57.88 kg / 127.61 pounds
57883.3 g / 567.8 N
11 mm
92%
 63.67 kg / 140.37 pounds
63671.7 g / 624.6 N
12 mm
100%
 69.46 kg / 153.13 pounds
69460.0 g / 681.4 N
A too thin steel cannot absorb the entire magnetic field, which squanders power of the holder. Should you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's power, you require a sufficiently solid piece of steel. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the product works worse. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - resistance threshold
MW 45x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 69.46 kg / 153.13 pounds
69460.0 g / 681.4 N
 OK
40 °C -2.2% 67.93 kg / 149.76 pounds
67931.9 g / 666.4 N
 OK
60 °C -4.4% 66.40 kg / 146.40 pounds
66403.8 g / 651.4 N
 OK
80 °C -6.6% 64.88 kg / 143.03 pounds
64875.6 g / 636.4 N
100 °C -28.8% 49.46 kg / 109.03 pounds
49455.5 g / 485.2 N
Standard neodymium magnets lose strength above the temperature limit. Watch out for overheating – high temperature can irreversibly destroy this product. With every degree above norm, the magnet's power temporarily decreases. Do not use this magnet close to ovens exceeding its safe range. Ignoring the limit will result in permanent loss of magnetic properties.
*Important note: Heat tolerance is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) may lose charge permanently under lower heat stress than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field range
MW 45x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 241.01 kg / 531.33 pounds
5 803 Gs
36.15 kg / 79.70 pounds
36151 g / 354.6 N
 N/A
1 mm 230.79 kg / 508.80 pounds
9 703 Gs
34.62 kg / 76.32 pounds
34618 g / 339.6 N
 207.71 kg / 457.92 pounds
~0 Gs
2 mm 220.52 kg / 486.16 pounds
9 485 Gs
33.08 kg / 72.92 pounds
33078 g / 324.5 N
 198.47 kg / 437.54 pounds
~0 Gs
3 mm 210.44 kg / 463.94 pounds
9 265 Gs
31.57 kg / 69.59 pounds
31566 g / 309.7 N
 189.39 kg / 417.54 pounds
~0 Gs
5 mm 190.94 kg / 420.95 pounds
8 826 Gs
28.64 kg / 63.14 pounds
28641 g / 281.0 N
 171.85 kg / 378.86 pounds
~0 Gs
10 mm 146.87 kg / 323.80 pounds
7 741 Gs
22.03 kg / 48.57 pounds
22031 g / 216.1 N
 132.19 kg / 291.42 pounds
~0 Gs
20 mm 81.65 kg / 180.01 pounds
5 771 Gs
12.25 kg / 27.00 pounds
12247 g / 120.1 N
 73.48 kg / 162.01 pounds
~0 Gs
50 mm 12.52 kg / 27.60 pounds
2 260 Gs
1.88 kg / 4.14 pounds
1878 g / 18.4 N
 11.27 kg / 24.84 pounds
~0 Gs
60 mm 7.01 kg / 15.44 pounds
1 690 Gs
1.05 kg / 2.32 pounds
1051 g / 10.3 N
 6.30 kg / 13.90 pounds
~0 Gs
70 mm 4.06 kg / 8.95 pounds
1 287 Gs
0.61 kg / 1.34 pounds
609 g / 6.0 N
 3.66 kg / 8.06 pounds
~0 Gs
80 mm 2.44 kg / 5.38 pounds
998 Gs
0.37 kg / 0.81 pounds
366 g / 3.6 N
 2.20 kg / 4.84 pounds
~0 Gs
90 mm 1.51 kg / 3.34 pounds
786 Gs
0.23 kg / 0.50 pounds
227 g / 2.2 N
 1.36 kg / 3.01 pounds
~0 Gs
100 mm 0.97 kg / 2.14 pounds
629 Gs
0.15 kg / 0.32 pounds
145 g / 1.4 N
 0.87 kg / 1.92 pounds
~0 Gs
Two magnetic products attract each other from a wider radius than a neodymium and metal setup. Such a system of magnet-to-magnet produces a massive flux and a further horizon of operation. Want to build a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is massive. The levitation is slightly lower than the attraction, but still significant.
*The magnetic induction for N-N configuration drops to ~0 Gs in the exact middle between the magnets (due to field cancellation).
Note: Results show friction force of dual same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - warnings
MW 45x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 25.5 cm
Hearing aid 10 Gs (1.0 mT) 20.0 cm
Timepiece 20 Gs (2.0 mT) 15.5 cm
Mobile device 40 Gs (4.0 mT) 12.0 cm
Car key 50 Gs (5.0 mT) 11.0 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 4.0 cm
Powerful magnet radiation is a real danger to electronics and pacemakers. These magnets produce a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation penetrates the body and glass. Exceptional care must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MW 45x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.76 km/h
(4.66 m/s)
 3.88 J
30 mm 24.77 km/h
(6.88 m/s)
 8.47 J
50 mm 31.50 km/h
(8.75 m/s)
 13.70 J
100 mm 44.44 km/h
(12.34 m/s)
 27.26 J
Magnetic elements are delicate – a strong collision with metal can result in shattering. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can cause material chips or injury to fingers. Be sure to control the product 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 neodymium. Use safety goggles when working with powerful specimens.

Table 9: Coating parameters (durability)
MW 45x30 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 45x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 79 446 Mx 794.5 µWb
Pc Coefficient 0.71 High (Stable)
Flux value emitted by the pole surface. Key data for generator designers and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
MW 45x30 / N38

Environment Effective steel pull Effect
Air (land) 69.46 kg Standard
Water (riverbed) 79.53 kg
(+10.07 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Sliding resistance

*Caution: On a vertical surface, the magnet holds only approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely 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) = 0.71

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Technical and environmental data
Material specification
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: 010073-2026
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The presented product is an incredibly powerful cylindrical magnet, manufactured from modern NdFeB material, which, at dimensions of Ø45x30 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 69.46 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 681.39 N with a weight of only 357.85 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 45.1 mm) using two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable 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 (Ø45x30), 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 30 mm. The key parameter here is the lifting capacity amounting to approximately 69.46 kg (force ~681.39 N), which, with such compact dimensions, proves the high power 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 30 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 as well as weaknesses of neodymium magnets.

Pros

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • Neodymium magnets generate maximum magnetic induction on a contact point, which allows for strong attraction,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Possibility of detailed machining and adjusting to complex applications,
  • Wide application in high-tech industry – they are utilized in mass storage devices, drive modules, precision medical tools, as well as technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Characteristics of disadvantages of neodymium magnets and ways of using them
  • Susceptibility to cracking 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
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complicated shapes in magnets, we propose using casing - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these magnets are able to complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Lifting parameters

Best holding force of the magnet in ideal parameters – what contributes to it?

Holding force of 69.46 kg is a theoretical maximum value conducted under standard conditions:
  • on a base made of mild steel, optimally conducting the magnetic flux
  • with a cross-section no less than 10 mm
  • characterized by smoothness
  • under conditions of no distance (metal-to-metal)
  • under vertical force vector (90-degree angle)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Holding efficiency is affected by specific conditions, including (from priority):
  • Space between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
  • Smoothness – ideal contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Bone fractures

Large magnets can crush fingers instantly. Under no circumstances place your hand between two strong magnets.

Nickel allergy

Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness happens, immediately stop working with magnets and use protective gear.

Do not overheat magnets

Keep cool. NdFeB magnets are susceptible to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Safe operation

Handle magnets with awareness. Their immense force can surprise even professionals. Be vigilant and respect their power.

Dust explosion hazard

Machining of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

No play value

Neodymium magnets are not intended for children. Swallowing a few magnets can lead to them connecting inside the digestive tract, which constitutes a critical condition and necessitates urgent medical intervention.

Beware of splinters

Despite metallic appearance, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

GPS and phone interference

Navigation devices and smartphones are extremely susceptible to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Data carriers

Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Implant safety

Life threat: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Attention! Details about hazards in the article: Magnet Safety Guide.