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MW 45x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010073

GTIN/EAN: 5906301810728

Load capacity 69.46 kg / 681.39 N Magnetic Induction 495.87 mT / 4959 Gs
Diameter Ø
45 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
357.85 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
view parameters »

136.80 zł with VAT / pcs + price for transport

111.22 zł net + 23% VAT / pcs

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Carbon Footprint – environmental impact GPSR Regulation – product safety

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

PDF report Calculator
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Specifications as well as structure of magnets can be tested on our modular calculator.

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Product card - 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

Engineering modeling of the product - technical parameters

Presented data represent the direct effect of a physical calculation. Values rely on algorithms for the material Nd2Fe14B. Real-world conditions may differ. Treat these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs distance) - power drop
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 lbs
69460.0 g / 681.4 N
 dangerous!
1 mm 4742 Gs
474.2 mT
 63.55 kg / 140.11 lbs
63553.9 g / 623.5 N
 dangerous!
2 mm 4523 Gs
452.3 mT
 57.81 kg / 127.44 lbs
57805.8 g / 567.1 N
 dangerous!
3 mm 4303 Gs
430.3 mT
 52.33 kg / 115.36 lbs
52327.7 g / 513.3 N
 dangerous!
5 mm 3870 Gs
387.0 mT
 42.33 kg / 93.32 lbs
42329.9 g / 415.3 N
 dangerous!
10 mm 2886 Gs
288.6 mT
 23.53 kg / 51.88 lbs
23531.8 g / 230.8 N
 dangerous!
15 mm 2106 Gs
210.6 mT
 12.54 kg / 27.64 lbs
12537.0 g / 123.0 N
 dangerous!
20 mm 1535 Gs
153.5 mT
 6.66 kg / 14.68 lbs
6657.1 g / 65.3 N
 warning
30 mm 845 Gs
84.5 mT
 2.02 kg / 4.45 lbs
2018.9 g / 19.8 N
 warning
50 mm 315 Gs
31.5 mT
 0.28 kg / 0.62 lbs
279.5 g / 2.7 N
 safe
Grip strength weakens drastically per each millimeter of distance. Note that even a microscopic distance (e.g., dirt, paint, rust) strongly weakens the grip. Magnetic products operate most effectively in perfect adhesion; gap weakens the force. Notice how rapidly the load capacity drop, when the product does not touch tightly to the steel surface. When planning the arrangement, avoid redundant distances.

Table 2: Shear force (vertical surface)
MW 45x30 / N38

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

Table 3: Vertical assembly (sliding) - 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 lbs
20838.0 g / 204.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
13.89 kg / 30.63 lbs
13892.0 g / 136.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
6.95 kg / 15.31 lbs
6946.0 g / 68.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
34.73 kg / 76.57 lbs
34730.0 g / 340.7 N
When hanging a element on a upright surface (e.g., a fridge), it will maintain just about 20%-30% of its nominal power. Gravitational force and a weak degree of grip cause that holders slide down faster than they detach. Want to create a hanger? Consider that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a much lighter load. Application of an anti-slip layer can drastically improve the result.

Table 4: Material efficiency (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 lbs
2315.3 g / 22.7 N
1 mm
8%
 5.79 kg / 12.76 lbs
5788.3 g / 56.8 N
2 mm
17%
 11.58 kg / 25.52 lbs
11576.7 g / 113.6 N
3 mm
25%
 17.37 kg / 38.28 lbs
17365.0 g / 170.4 N
5 mm
42%
 28.94 kg / 63.81 lbs
28941.7 g / 283.9 N
10 mm
83%
 57.88 kg / 127.61 lbs
57883.3 g / 567.8 N
11 mm
92%
 63.67 kg / 140.37 lbs
63671.7 g / 624.6 N
12 mm
100%
 69.46 kg / 153.13 lbs
69460.0 g / 681.4 N
A too thin steel cannot take in the entire magnetic field, which wastes potential of the magnet. Should you install a neodymium to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To achieve 100% of this magnet's potential, you need a suitably thick element of steel. The saturation phenomenon causes that on thin elements (e.g., car bodies), the magnet holds weaker. We recommend selecting the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - 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 lbs
69460.0 g / 681.4 N
 OK
40 °C -2.2% 67.93 kg / 149.76 lbs
67931.9 g / 666.4 N
 OK
60 °C -4.4% 66.40 kg / 146.40 lbs
66403.8 g / 651.4 N
 OK
80 °C -6.6% 64.88 kg / 143.03 lbs
64875.6 g / 636.4 N
100 °C -28.8% 49.46 kg / 109.03 lbs
49455.5 g / 485.2 N
Ordinary NdFeB products change their properties parameters above the temperature limit. Watch out for overheating – excessive heat can permanently damage this magnet. As the temperature rises, the magnet's power temporarily decreases. Refrain from using this magnet near heat sources exceeding its safe range. Ignoring the limit will cause destruction of magnetic properties.
*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Flat magnets (pancake types) risk losing magnetic properties at lower temperatures than taller cylinders. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
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 lbs
5 803 Gs
36.15 kg / 79.70 lbs
36151 g / 354.6 N
 N/A
1 mm 230.79 kg / 508.80 lbs
9 703 Gs
34.62 kg / 76.32 lbs
34618 g / 339.6 N
 207.71 kg / 457.92 lbs
~0 Gs
2 mm 220.52 kg / 486.16 lbs
9 485 Gs
33.08 kg / 72.92 lbs
33078 g / 324.5 N
 198.47 kg / 437.54 lbs
~0 Gs
3 mm 210.44 kg / 463.94 lbs
9 265 Gs
31.57 kg / 69.59 lbs
31566 g / 309.7 N
 189.39 kg / 417.54 lbs
~0 Gs
5 mm 190.94 kg / 420.95 lbs
8 826 Gs
28.64 kg / 63.14 lbs
28641 g / 281.0 N
 171.85 kg / 378.86 lbs
~0 Gs
10 mm 146.87 kg / 323.80 lbs
7 741 Gs
22.03 kg / 48.57 lbs
22031 g / 216.1 N
 132.19 kg / 291.42 lbs
~0 Gs
20 mm 81.65 kg / 180.01 lbs
5 771 Gs
12.25 kg / 27.00 lbs
12247 g / 120.1 N
 73.48 kg / 162.01 lbs
~0 Gs
50 mm 12.52 kg / 27.60 lbs
2 260 Gs
1.88 kg / 4.14 lbs
1878 g / 18.4 N
 11.27 kg / 24.84 lbs
~0 Gs
60 mm 7.01 kg / 15.44 lbs
1 690 Gs
1.05 kg / 2.32 lbs
1051 g / 10.3 N
 6.30 kg / 13.90 lbs
~0 Gs
70 mm 4.06 kg / 8.95 lbs
1 287 Gs
0.61 kg / 1.34 lbs
609 g / 6.0 N
 3.66 kg / 8.06 lbs
~0 Gs
80 mm 2.44 kg / 5.38 lbs
998 Gs
0.37 kg / 0.81 lbs
366 g / 3.6 N
 2.20 kg / 4.84 lbs
~0 Gs
90 mm 1.51 kg / 3.34 lbs
786 Gs
0.23 kg / 0.50 lbs
227 g / 2.2 N
 1.36 kg / 3.01 lbs
~0 Gs
100 mm 0.97 kg / 2.14 lbs
629 Gs
0.15 kg / 0.32 lbs
145 g / 1.4 N
 0.87 kg / 1.92 lbs
~0 Gs
Two magnetic products interact from a wider radius than a neodymium and metal setup. The connection of two magnets generates a stronger field and a larger range of performance. Want to build a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the impact force is massive. The repulsion force is marginally weaker than the attraction, but still large.
*The magnetic induction in repulsion mode reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Important: Results apply to sliding force of dual matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
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
A strong magnetic field poses a large risk to electronic devices as well as pacemakers. These magnets produce a field that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and housings. Increased vigilance must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, speakers, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.63 km/h
(4.90 m/s)
 4.29 J
30 mm 20.82 km/h
(5.78 m/s)
 5.98 J
50 mm 21.10 km/h
(5.86 m/s)
 6.15 J
100 mm 21.17 km/h
(5.88 m/s)
 6.18 J
NdFeB products are prone to chipping – a strong collision with metal causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can cause material chips or painful pinches to fingers. Hold the magnet firmly during mounting so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when playing with powerful specimens.

Table 9: Surface protection spec
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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

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

Parameter Value SI Unit / Description
Magnetic Flux 79 446 Mx 794.5 µWb
Pc Coefficient 0.71 High (Stable)
Total magnetic flux passing through the magnet pole. Key data for generator designers as well as sensors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

1. Vertical hold

*Warning: On a vertical wall, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Steel saturation

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

3. Temperature resistance

*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.

Engineering data and GPSR

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 extremely powerful rod magnet, produced from modern NdFeB material, which, at dimensions of Ø45x30 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 69.46 kg), this product is in stock from our European logistics center, ensuring rapid 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.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 681.39 N with a weight of only 357.85 g, this cylindrical magnet is indispensable in miniature devices 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 chipping the coating of this professional component. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need even stronger 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 store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 45 mm and height 30 mm. The value of 681.39 N means that the magnet is capable of holding a weight many times exceeding its own mass of 357.85 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This cylinder 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 through the diameter if your project requires it.

Advantages and disadvantages of neodymium magnets.

Benefits

Apart from their consistent power, neodymium magnets have these key benefits:
  • They retain full power for nearly 10 years – the loss is just ~1% (according to analyses),
  • Neodymium magnets are extremely resistant to magnetic field loss caused by external magnetic fields,
  • By covering with a decorative layer of gold, the element acquires an modern look,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
  • In view of the potential of free shaping and customization to individualized projects, neodymium magnets can be produced in a wide range of shapes and sizes, which makes them more universal,
  • Versatile presence in future technologies – they find application in data components, drive modules, precision medical tools, also complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using casing - magnetic mount.
  • Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, tiny parts of these products can disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Lifting parameters

Maximum holding power of the magnet – what contributes to it?

The load parameter shown represents the peak performance, measured under ideal test conditions, specifically:
  • on a plate made of structural steel, optimally conducting the magnetic field
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with an polished contact surface
  • with total lack of distance (no paint)
  • for force applied at a right angle (pull-off, not shear)
  • at standard ambient temperature

Determinants of lifting force in real conditions

Bear in mind that the magnet holding will differ subject to the following factors, in order of importance:
  • Clearance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet holds much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures decrease magnetic properties and lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature influence – high temperature weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Safe handling of neodymium magnets
Safe distance

Data protection: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Fire risk

Mechanical processing of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Magnetic interference

A powerful magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Keep magnets near a device to prevent damaging the sensors.

Magnets are brittle

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Danger to the youngest

Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are fatal.

Skin irritation risks

Studies show that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, avoid direct skin contact and select encased magnets.

Bone fractures

Danger of trauma: The attraction force is so great that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

ICD Warning

Patients with a heart stimulator must maintain an absolute distance from magnets. The magnetic field can interfere with the operation of the life-saving device.

Permanent damage

Avoid heat. Neodymium magnets are susceptible to temperature. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Powerful field

Handle magnets with awareness. Their powerful strength can shock even professionals. Plan your moves and do not underestimate their power.

Safety First! More info about risks in the article: Magnet Safety Guide.