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MW 45x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010070

GTIN/EAN: 5906301810698

5.00

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

61.84 with VAT / pcs + price for transport

50.28 ZŁ net + 23% VAT / pcs

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Detailed specification - 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 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 analysis of the magnet - technical parameters

The following information are the outcome of a physical calculation. Values were calculated on models for the class Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs distance) - characteristics
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 lbs
48550.0 g / 476.3 N
crushing
1 mm 3318 Gs
331.8 mT
45.21 kg / 99.68 lbs
45214.3 g / 443.6 N
crushing
2 mm 3189 Gs
318.9 mT
41.76 kg / 92.07 lbs
41762.8 g / 409.7 N
crushing
3 mm 3054 Gs
305.4 mT
38.30 kg / 84.44 lbs
38303.2 g / 375.8 N
crushing
5 mm 2774 Gs
277.4 mT
31.61 kg / 69.69 lbs
31610.0 g / 310.1 N
crushing
10 mm 2090 Gs
209.0 mT
17.95 kg / 39.57 lbs
17948.5 g / 176.1 N
crushing
15 mm 1521 Gs
152.1 mT
9.50 kg / 20.95 lbs
9500.8 g / 93.2 N
strong
20 mm 1096 Gs
109.6 mT
4.94 kg / 10.88 lbs
4936.3 g / 48.4 N
strong
30 mm 585 Gs
58.5 mT
1.41 kg / 3.10 lbs
1407.9 g / 13.8 N
safe
50 mm 205 Gs
20.5 mT
0.17 kg / 0.38 lbs
172.6 g / 1.7 N
safe

Table 2: Slippage load (vertical surface)
MW 45x15 / N38

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

Table 3: Vertical assembly (shearing) - vertical pull
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 lbs
14565.0 g / 142.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
9.71 kg / 21.41 lbs
9710.0 g / 95.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.86 kg / 10.70 lbs
4855.0 g / 47.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
24.28 kg / 53.52 lbs
24275.0 g / 238.1 N

Table 4: Steel thickness (substrate influence) - power losses
MW 45x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
2.43 kg / 5.35 lbs
2427.5 g / 23.8 N
1 mm
13%
6.07 kg / 13.38 lbs
6068.8 g / 59.5 N
2 mm
25%
12.14 kg / 26.76 lbs
12137.5 g / 119.1 N
3 mm
38%
18.21 kg / 40.14 lbs
18206.2 g / 178.6 N
5 mm
63%
30.34 kg / 66.90 lbs
30343.8 g / 297.7 N
10 mm
100%
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
11 mm
100%
48.55 kg / 107.03 lbs
48550.0 g / 476.3 N
12 mm
100%
48.55 kg / 107.03 lbs
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 lbs
48550.0 g / 476.3 N
OK
40 °C -2.2% 47.48 kg / 104.68 lbs
47481.9 g / 465.8 N
OK
60 °C -4.4% 46.41 kg / 102.32 lbs
46413.8 g / 455.3 N
80 °C -6.6% 45.35 kg / 99.97 lbs
45345.7 g / 444.8 N
100 °C -28.8% 34.57 kg / 76.21 lbs
34567.6 g / 339.1 N

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

Table 7: Hazards (implants) - precautionary measures
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
Timepiece 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 20.09 km/h
(5.58 m/s)
2.79 J
30 mm 29.29 km/h
(8.14 m/s)
5.92 J
50 mm 37.23 km/h
(10.34 m/s)
9.57 J
100 mm 52.54 km/h
(14.59 m/s)
19.05 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: Construction 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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

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

2. Steel saturation

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

3. Power loss vs temp

*For N38 grade, the max working temp is 80°C.

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

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

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
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: 010070-2026
Magnet Unit Converter
Magnet pull force

Magnetic Induction

See also offers

The presented product is an exceptionally strong cylinder magnet, composed of modern NdFeB material, which, at dimensions of Ø45x15 mm, guarantees optimal power. This specific item boasts an accuracy of ±0.1mm and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 48.55 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, 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 electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 45.1 mm) using epoxy glues. To ensure stability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are suitable for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø45x15), 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 15 mm. 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 oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 15 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 and disadvantages of Nd2Fe14B magnets.

Benefits

Besides their immense strength, neodymium magnets offer the following advantages:
  • They retain magnetic properties for around 10 years – the loss is just ~1% (based on simulations),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • In other words, due to the smooth finish of nickel, the element looks attractive,
  • Neodymium magnets ensure maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of detailed modeling and adjusting to precise applications,
  • Key role in innovative solutions – they are utilized in mass storage devices, brushless drives, medical devices, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in compact constructions

Cons

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Limited possibility of producing threads in the magnet and complex forms - recommended is a housing - mounting mechanism.
  • Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnetwhat affects it?

Information about lifting capacity was determined for optimal configuration, including:
  • with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • with zero gap (no paint)
  • for force acting at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Lifting capacity in real conditions – factors

It is worth knowing that the working load may be lower subject to elements below, starting with the most relevant:
  • Space between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Surface finish – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate reduces the load capacity.

Precautions when working with neodymium magnets
Metal Allergy

Certain individuals experience a sensitization to Ni, which is the typical protective layer for neodymium magnets. Prolonged contact may cause a rash. We suggest use protective gloves.

Product not for children

Product intended for adults. Small elements can be swallowed, leading to severe trauma. Store out of reach of kids and pets.

Impact on smartphones

A strong magnetic field interferes with the functioning of magnetometers in phones and GPS navigation. Maintain magnets close to a device to prevent damaging the sensors.

Implant safety

Warning for patients: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or request help to handle the magnets.

Threat to electronics

Do not bring magnets close to a purse, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.

Fragile material

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets will cause them shattering into small pieces.

Power loss in heat

Do not overheat. NdFeB magnets are susceptible to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Fire warning

Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Handling guide

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Hand protection

Risk of injury: The attraction force is so immense that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Important! More info about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98