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MW 45x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010070

GTIN/EAN: 5906301810698

5.00
Load capacity 48.55 kg / 476.32 N Magnetic Induction 343.84 mT / 3438 Gs
Diameter Ø
45 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
178.92 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

50.28net / pcs

61.84 zł with VAT (23% VAT) / pcs

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Quantity
Net
Gross
price from 1 pcs
50.28 zł
61.84 zł
price from 20 pcs
47.26 zł
58.13 zł
price from 50 pcs
44.25 zł
54.42 zł

Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

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.

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Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical details - MW 45x15 / N38 - cylindrical magnet

Specification / characteristics - MW 45x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010070
GTIN/EAN 5906301810698
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 15 mm [±0,1 mm]
Weight 178.92 g
Magnetization Direction ↑ axial
Load capacity ~ ? 48.55 kg / 476.32 N
Magnetic Induction ~ ? 343.84 mT / 3438 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x15 / 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 310 °C
Curie Temperature TF 590 °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 simulation of the assembly - data

The following data are the result of a physical calculation. Values rely on models for the material Nd2Fe14B. Actual conditions may differ. Please consider these data as a reference point during assembly planning.

Table 1: Static force (force vs gap) - power drop
MW 45x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3438 Gs
343.8 mT
48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
dangerous!
1 mm 3318 Gs
331.8 mT
45.21 kg / 99.68 pounds
45214.3 g / 443.6 N
dangerous!
2 mm 3189 Gs
318.9 mT
41.76 kg / 92.07 pounds
41762.8 g / 409.7 N
dangerous!
3 mm 3054 Gs
305.4 mT
38.30 kg / 84.44 pounds
38303.2 g / 375.8 N
dangerous!
5 mm 2774 Gs
277.4 mT
31.61 kg / 69.69 pounds
31610.0 g / 310.1 N
dangerous!
10 mm 2090 Gs
209.0 mT
17.95 kg / 39.57 pounds
17948.5 g / 176.1 N
dangerous!
15 mm 1521 Gs
152.1 mT
9.50 kg / 20.95 pounds
9500.8 g / 93.2 N
strong
20 mm 1096 Gs
109.6 mT
4.94 kg / 10.88 pounds
4936.3 g / 48.4 N
strong
30 mm 585 Gs
58.5 mT
1.41 kg / 3.10 pounds
1407.9 g / 13.8 N
safe
50 mm 205 Gs
20.5 mT
0.17 kg / 0.38 pounds
172.6 g / 1.7 N
safe

Table 2: Vertical load (wall)
MW 45x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 9.71 kg / 21.41 pounds
9710.0 g / 95.3 N
1 mm Stal (~0.2) 9.04 kg / 19.93 pounds
9042.0 g / 88.7 N
2 mm Stal (~0.2) 8.35 kg / 18.41 pounds
8352.0 g / 81.9 N
3 mm Stal (~0.2) 7.66 kg / 16.89 pounds
7660.0 g / 75.1 N
5 mm Stal (~0.2) 6.32 kg / 13.94 pounds
6322.0 g / 62.0 N
10 mm Stal (~0.2) 3.59 kg / 7.91 pounds
3590.0 g / 35.2 N
15 mm Stal (~0.2) 1.90 kg / 4.19 pounds
1900.0 g / 18.6 N
20 mm Stal (~0.2) 0.99 kg / 2.18 pounds
988.0 g / 9.7 N
30 mm Stal (~0.2) 0.28 kg / 0.62 pounds
282.0 g / 2.8 N
50 mm Stal (~0.2) 0.03 kg / 0.07 pounds
34.0 g / 0.3 N

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 45x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
14.56 kg / 32.11 pounds
14565.0 g / 142.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
9.71 kg / 21.41 pounds
9710.0 g / 95.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.86 kg / 10.70 pounds
4855.0 g / 47.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
24.28 kg / 53.52 pounds
24275.0 g / 238.1 N

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 45x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
2.43 kg / 5.35 pounds
2427.5 g / 23.8 N
1 mm
13%
6.07 kg / 13.38 pounds
6068.8 g / 59.5 N
2 mm
25%
12.14 kg / 26.76 pounds
12137.5 g / 119.1 N
3 mm
38%
18.21 kg / 40.14 pounds
18206.2 g / 178.6 N
5 mm
63%
30.34 kg / 66.90 pounds
30343.8 g / 297.7 N
10 mm
100%
48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
11 mm
100%
48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
12 mm
100%
48.55 kg / 107.03 pounds
48550.0 g / 476.3 N

Table 5: Working in heat (stability) - power drop
MW 45x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 48.55 kg / 107.03 pounds
48550.0 g / 476.3 N
OK
40 °C -2.2% 47.48 kg / 104.68 pounds
47481.9 g / 465.8 N
OK
60 °C -4.4% 46.41 kg / 102.32 pounds
46413.8 g / 455.3 N
80 °C -6.6% 45.35 kg / 99.97 pounds
45345.7 g / 444.8 N
100 °C -28.8% 34.57 kg / 76.21 pounds
34567.6 g / 339.1 N

Table 6: Two magnets (attraction) - field collision
MW 45x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 115.89 kg / 255.50 pounds
4 958 Gs
17.38 kg / 38.32 pounds
17384 g / 170.5 N
N/A
1 mm 111.99 kg / 246.89 pounds
6 759 Gs
16.80 kg / 37.03 pounds
16798 g / 164.8 N
100.79 kg / 222.20 pounds
~0 Gs
2 mm 107.93 kg / 237.94 pounds
6 636 Gs
16.19 kg / 35.69 pounds
16189 g / 158.8 N
97.14 kg / 214.15 pounds
~0 Gs
3 mm 103.82 kg / 228.89 pounds
6 508 Gs
15.57 kg / 34.33 pounds
15573 g / 152.8 N
93.44 kg / 206.00 pounds
~0 Gs
5 mm 95.55 kg / 210.66 pounds
6 244 Gs
14.33 kg / 31.60 pounds
14333 g / 140.6 N
86.00 kg / 189.59 pounds
~0 Gs
10 mm 75.46 kg / 166.35 pounds
5 548 Gs
11.32 kg / 24.95 pounds
11318 g / 111.0 N
67.91 kg / 149.72 pounds
~0 Gs
20 mm 42.84 kg / 94.46 pounds
4 181 Gs
6.43 kg / 14.17 pounds
6427 g / 63.0 N
38.56 kg / 85.01 pounds
~0 Gs
50 mm 6.20 kg / 13.67 pounds
1 591 Gs
0.93 kg / 2.05 pounds
930 g / 9.1 N
5.58 kg / 12.31 pounds
~0 Gs
60 mm 3.36 kg / 7.41 pounds
1 171 Gs
0.50 kg / 1.11 pounds
504 g / 4.9 N
3.02 kg / 6.67 pounds
~0 Gs
70 mm 1.89 kg / 4.16 pounds
877 Gs
0.28 kg / 0.62 pounds
283 g / 2.8 N
1.70 kg / 3.74 pounds
~0 Gs
80 mm 1.10 kg / 2.42 pounds
669 Gs
0.16 kg / 0.36 pounds
165 g / 1.6 N
0.99 kg / 2.18 pounds
~0 Gs
90 mm 0.66 kg / 1.46 pounds
520 Gs
0.10 kg / 0.22 pounds
99 g / 1.0 N
0.60 kg / 1.31 pounds
~0 Gs
100 mm 0.41 kg / 0.91 pounds
410 Gs
0.06 kg / 0.14 pounds
62 g / 0.6 N
0.37 kg / 0.82 pounds
~0 Gs

Table 7: Safety (HSE) (implants) - warnings
MW 45x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 20.5 cm
Hearing aid 10 Gs (1.0 mT) 16.0 cm
Mechanical watch 20 Gs (2.0 mT) 12.5 cm
Mobile device 40 Gs (4.0 mT) 10.0 cm
Car key 50 Gs (5.0 mT) 9.0 cm
Payment card 400 Gs (40.0 mT) 4.0 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm

Table 8: Dynamics (kinetic energy) - warning
MW 45x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.39 km/h
(5.94 m/s)
3.16 J
30 mm 25.33 km/h
(7.04 m/s)
4.43 J
50 mm 25.64 km/h
(7.12 m/s)
4.54 J
100 mm 25.70 km/h
(7.14 m/s)
4.56 J

Table 9: Corrosion resistance
MW 45x15 / 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)

Table 10: Electrical data (Flux)
MW 45x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 57 854 Mx 578.5 µWb
Pc Coefficient 0.44 Low (Flat)

Table 11: Hydrostatics and buoyancy
MW 45x15 / N38

Environment Effective steel pull Effect
Air (land) 48.55 kg Standard
Water (riverbed) 55.59 kg
(+7.04 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

1. Wall mount (shear)

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

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Thermal stability

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.44

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.

Technical and environmental data

Chemical composition

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: 010070-2026
Measurement Calculator

Pulling force


Magnetic Field

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The presented product is an incredibly powerful cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø45x15 mm, guarantees optimal power. This specific item is characterized by an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 48.55 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 476.32 N with a weight of only 178.92 g, this rod is indispensable in miniature devices and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against 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 durability of the connection.
Magnets N38 are strong enough for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø45x15), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø45x15 mm, which, at a weight of 178.92 g, makes it an element with impressive magnetic energy density. The value of 476.32 N means that the magnet is capable of holding a weight many times exceeding its own mass of 178.92 g. The product has a [NiCuNi] coating, which protects the surface against external factors, 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.

Advantages and disadvantages of neodymium magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • Their power remains stable, and after around 10 years it drops only by ~1% (according to research),
  • Magnets perfectly defend themselves against loss of magnetization caused by foreign field sources,
  • By covering with a lustrous layer of silver, the element has an proper look,
  • Magnets have extremely high magnetic induction on the outer layer,
  • 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 ability of flexible forming and customization to custom solutions, magnetic components can be produced in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Wide application in advanced technology sectors – they are utilized in data components, drive modules, advanced medical instruments, and complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages

Cons of neodymium magnets: application proposals
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Magnetic strength at its maximum – what affects it?

The lifting capacity listed is a theoretical maximum value executed under specific, ideal conditions:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with an ground contact surface
  • with total lack of distance (no impurities)
  • for force acting at a right angle (in the magnet axis)
  • at temperature room level

Key elements affecting lifting force

Effective lifting capacity is influenced by specific conditions, such as (from priority):
  • Distance – the presence of foreign body (rust, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • 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 reacts the same. High carbon content weaken the attraction effect.
  • Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was tested 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. In addition, even a small distance between the magnet and the plate lowers the holding force.

Warnings
Machining danger

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Do not give to children

Neodymium magnets are not toys. Swallowing several magnets may result in them pinching intestinal walls, which poses a critical condition and requires urgent medical intervention.

Allergy Warning

Medical facts indicate that nickel (the usual finish) is a strong allergen. For allergy sufferers, avoid direct skin contact or opt for coated magnets.

Pinching danger

Protect your hands. Two large magnets will snap together instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Protect data

Avoid bringing magnets close to a wallet, laptop, or screen. The magnetism can permanently damage these devices and erase data from cards.

Thermal limits

Do not overheat. Neodymium magnets are sensitive to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Handling rules

Be careful. Neodymium magnets act from a distance and snap with huge force, often faster than you can react.

Keep away from electronics

Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your phone, device, and navigation systems.

Protective goggles

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Pacemakers

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Attention! Need more info? Check our post: Are neodymium magnets dangerous?