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MW 45x35 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010074

GTIN/EAN: 5906301810735

Diameter Ø

45 mm [±0,1 mm]

Height

35 mm [±0,1 mm]

Weight

417.49 g

Magnetization Direction

↑ axial

Load capacity

68.98 kg / 676.73 N

Magnetic Induction

521.39 mT / 5214 Gs

Coating

[NiCuNi] Nickel

180.10 with VAT / pcs + price for transport

146.42 ZŁ net + 23% VAT / pcs

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Technical details - MW 45x35 / N38 - cylindrical magnet

Specification / characteristics - MW 45x35 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010074
GTIN/EAN 5906301810735
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 35 mm [±0,1 mm]
Weight 417.49 g
Magnetization Direction ↑ axial
Load capacity ~ ? 68.98 kg / 676.73 N
Magnetic Induction ~ ? 521.39 mT / 5214 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 45x35 / 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

Physical modeling of the assembly - data

These information are the outcome of a engineering calculation. Values are based on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs gap) - characteristics
MW 45x35 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5213 Gs
521.3 mT
68.98 kg / 152.07 pounds
68980.0 g / 676.7 N
dangerous!
1 mm 4982 Gs
498.2 mT
63.01 kg / 138.91 pounds
63010.2 g / 618.1 N
dangerous!
2 mm 4748 Gs
474.8 mT
57.23 kg / 126.18 pounds
57234.3 g / 561.5 N
dangerous!
3 mm 4516 Gs
451.6 mT
51.76 kg / 114.10 pounds
51756.9 g / 507.7 N
dangerous!
5 mm 4059 Gs
405.9 mT
41.82 kg / 92.19 pounds
41816.3 g / 410.2 N
dangerous!
10 mm 3027 Gs
302.7 mT
23.26 kg / 51.29 pounds
23264.1 g / 228.2 N
dangerous!
15 mm 2215 Gs
221.5 mT
12.45 kg / 27.45 pounds
12451.1 g / 122.1 N
dangerous!
20 mm 1619 Gs
161.9 mT
6.66 kg / 14.67 pounds
6656.2 g / 65.3 N
warning
30 mm 899 Gs
89.9 mT
2.05 kg / 4.52 pounds
2051.1 g / 20.1 N
warning
50 mm 340 Gs
34.0 mT
0.29 kg / 0.65 pounds
292.8 g / 2.9 N
low risk

Table 2: Slippage hold (wall)
MW 45x35 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 13.80 kg / 30.41 pounds
13796.0 g / 135.3 N
1 mm Stal (~0.2) 12.60 kg / 27.78 pounds
12602.0 g / 123.6 N
2 mm Stal (~0.2) 11.45 kg / 25.23 pounds
11446.0 g / 112.3 N
3 mm Stal (~0.2) 10.35 kg / 22.82 pounds
10352.0 g / 101.6 N
5 mm Stal (~0.2) 8.36 kg / 18.44 pounds
8364.0 g / 82.1 N
10 mm Stal (~0.2) 4.65 kg / 10.26 pounds
4652.0 g / 45.6 N
15 mm Stal (~0.2) 2.49 kg / 5.49 pounds
2490.0 g / 24.4 N
20 mm Stal (~0.2) 1.33 kg / 2.94 pounds
1332.0 g / 13.1 N
30 mm Stal (~0.2) 0.41 kg / 0.90 pounds
410.0 g / 4.0 N
50 mm Stal (~0.2) 0.06 kg / 0.13 pounds
58.0 g / 0.6 N

Table 3: Wall mounting (sliding) - vertical pull
MW 45x35 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
20.69 kg / 45.62 pounds
20694.0 g / 203.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
13.80 kg / 30.41 pounds
13796.0 g / 135.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
6.90 kg / 15.21 pounds
6898.0 g / 67.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
34.49 kg / 76.04 pounds
34490.0 g / 338.3 N

Table 4: Material efficiency (saturation) - sheet metal selection
MW 45x35 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
2.30 kg / 5.07 pounds
2299.3 g / 22.6 N
1 mm
8%
5.75 kg / 12.67 pounds
5748.3 g / 56.4 N
2 mm
17%
11.50 kg / 25.35 pounds
11496.7 g / 112.8 N
3 mm
25%
17.25 kg / 38.02 pounds
17245.0 g / 169.2 N
5 mm
42%
28.74 kg / 63.36 pounds
28741.7 g / 282.0 N
10 mm
83%
57.48 kg / 126.73 pounds
57483.3 g / 563.9 N
11 mm
92%
63.23 kg / 139.40 pounds
63231.7 g / 620.3 N
12 mm
100%
68.98 kg / 152.07 pounds
68980.0 g / 676.7 N

Table 5: Thermal stability (material behavior) - resistance threshold
MW 45x35 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 68.98 kg / 152.07 pounds
68980.0 g / 676.7 N
OK
40 °C -2.2% 67.46 kg / 148.73 pounds
67462.4 g / 661.8 N
OK
60 °C -4.4% 65.94 kg / 145.38 pounds
65944.9 g / 646.9 N
OK
80 °C -6.6% 64.43 kg / 142.04 pounds
64427.3 g / 632.0 N
100 °C -28.8% 49.11 kg / 108.28 pounds
49113.8 g / 481.8 N

Table 6: Two magnets (repulsion) - field range
MW 45x35 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 266.45 kg / 587.43 pounds
5 900 Gs
39.97 kg / 88.11 pounds
39968 g / 392.1 N
N/A
1 mm 254.93 kg / 562.03 pounds
10 198 Gs
38.24 kg / 84.30 pounds
38240 g / 375.1 N
229.44 kg / 505.82 pounds
~0 Gs
2 mm 243.39 kg / 536.59 pounds
9 965 Gs
36.51 kg / 80.49 pounds
36509 g / 358.2 N
219.05 kg / 482.93 pounds
~0 Gs
3 mm 232.10 kg / 511.70 pounds
9 731 Gs
34.82 kg / 76.76 pounds
34816 g / 341.5 N
208.89 kg / 460.53 pounds
~0 Gs
5 mm 210.35 kg / 463.75 pounds
9 264 Gs
31.55 kg / 69.56 pounds
31553 g / 309.5 N
189.32 kg / 417.37 pounds
~0 Gs
10 mm 161.53 kg / 356.11 pounds
8 118 Gs
24.23 kg / 53.42 pounds
24229 g / 237.7 N
145.37 kg / 320.49 pounds
~0 Gs
20 mm 89.86 kg / 198.12 pounds
6 055 Gs
13.48 kg / 29.72 pounds
13480 g / 132.2 N
80.88 kg / 178.30 pounds
~0 Gs
50 mm 14.04 kg / 30.96 pounds
2 394 Gs
2.11 kg / 4.64 pounds
2107 g / 20.7 N
12.64 kg / 27.87 pounds
~0 Gs
60 mm 7.92 kg / 17.47 pounds
1 798 Gs
1.19 kg / 2.62 pounds
1188 g / 11.7 N
7.13 kg / 15.72 pounds
~0 Gs
70 mm 4.63 kg / 10.21 pounds
1 375 Gs
0.69 kg / 1.53 pounds
695 g / 6.8 N
4.17 kg / 9.19 pounds
~0 Gs
80 mm 2.80 kg / 6.18 pounds
1 070 Gs
0.42 kg / 0.93 pounds
421 g / 4.1 N
2.52 kg / 5.56 pounds
~0 Gs
90 mm 1.75 kg / 3.87 pounds
846 Gs
0.26 kg / 0.58 pounds
263 g / 2.6 N
1.58 kg / 3.48 pounds
~0 Gs
100 mm 1.13 kg / 2.49 pounds
679 Gs
0.17 kg / 0.37 pounds
170 g / 1.7 N
1.02 kg / 2.24 pounds
~0 Gs

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 45x35 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 26.5 cm
Hearing aid 10 Gs (1.0 mT) 20.5 cm
Mechanical watch 20 Gs (2.0 mT) 16.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 12.5 cm
Car key 50 Gs (5.0 mT) 11.5 cm
Payment card 400 Gs (40.0 mT) 5.0 cm
HDD hard drive 600 Gs (60.0 mT) 4.0 cm

Table 8: Collisions (kinetic energy) - warning
MW 45x35 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.46 km/h
(4.29 m/s)
3.85 J
30 mm 22.87 km/h
(6.35 m/s)
8.42 J
50 mm 29.06 km/h
(8.07 m/s)
13.61 J
100 mm 41.00 km/h
(11.39 m/s)
27.07 J

Table 9: Anti-corrosion coating durability
MW 45x35 / 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 (Pc)
MW 45x35 / N38

Parameter Value SI Unit / Description
Magnetic Flux 83 921 Mx 839.2 µWb
Pc Coefficient 0.78 High (Stable)

Table 11: Underwater work (magnet fishing)
MW 45x35 / N38

Environment Effective steel pull Effect
Air (land) 68.98 kg Standard
Water (riverbed) 78.98 kg
(+10.00 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Note: On a vertical surface, the magnet retains merely a fraction of its perpendicular strength.

2. Steel saturation

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

3. Power loss vs temp

*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) = 0.78

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
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: 010074-2026
Measurement Calculator
Force (pull)

Magnetic Field

Check out also proposals

The offered product is an extremely powerful cylindrical magnet, composed of modern NdFeB material, which, at dimensions of Ø45x35 mm, guarantees maximum efficiency. This specific item boasts an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 68.98 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 676.73 N with a weight of only 417.49 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 45.1 mm) using epoxy glues. To ensure long-term durability 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 frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø45x35), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 45 mm and height 35 mm. The key parameter here is the lifting capacity amounting to approximately 68.98 kg (force ~676.73 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface 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 most desirable 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 as well as disadvantages of rare earth magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • Their magnetic field is durable, and after approximately ten years it drops only by ~1% (theoretically),
  • Magnets effectively resist against demagnetization caused by ambient magnetic noise,
  • Thanks to the reflective finish, the coating of nickel, gold, or silver gives an aesthetic appearance,
  • Neodymium magnets generate maximum magnetic induction on a their surface, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
  • Thanks to versatility in forming and the ability to adapt to unusual requirements,
  • Versatile presence in electronics industry – they find application in mass storage devices, electric motors, medical equipment, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their force 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 durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of creating threads in the magnet and complex forms - recommended is a housing - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Holding force characteristics

Breakaway strength of the magnet in ideal conditionswhat affects it?

The load parameter shown refers to the limit force, obtained under laboratory conditions, specifically:
  • with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • possessing a massiveness of at least 10 mm to avoid saturation
  • characterized by lack of roughness
  • with direct contact (no coatings)
  • under axial force direction (90-degree angle)
  • at standard ambient temperature

Key elements affecting lifting force

It is worth knowing that the magnet holding will differ influenced by the following factors, starting with the most relevant:
  • Distance – the presence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Steel thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be wasted to the other side.
  • Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Plate texture – ground elements ensure maximum contact, which increases force. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

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 load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Fragile material

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

Thermal limits

Control the heat. Heating the magnet above 80 degrees Celsius will destroy its properties and strength.

Finger safety

Pinching hazard: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Conscious usage

Exercise caution. Rare earth magnets attract from a distance and connect with huge force, often faster than you can move away.

Do not drill into magnets

Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Precision electronics

A powerful magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Maintain magnets near a smartphone to prevent damaging the sensors.

Adults only

Always store magnets away from children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are very dangerous.

Nickel coating and allergies

It is widely known that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands and opt for coated magnets.

Data carriers

Very strong magnetic fields can erase data on payment cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

Implant safety

For implant holders: Powerful magnets affect medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.

Attention! Looking for details? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98