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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

bulk discounts:

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Technical specification - 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

Engineering analysis of the assembly - report

The following data constitute the outcome of a engineering analysis. Results rely on models for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these calculations as a reference point during assembly planning.

Table 1: Static force (pull vs distance) - 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 LBS
68980.0 g / 676.7 N
critical level
1 mm 4982 Gs
498.2 mT
63.01 kg / 138.91 LBS
63010.2 g / 618.1 N
critical level
2 mm 4748 Gs
474.8 mT
57.23 kg / 126.18 LBS
57234.3 g / 561.5 N
critical level
3 mm 4516 Gs
451.6 mT
51.76 kg / 114.10 LBS
51756.9 g / 507.7 N
critical level
5 mm 4059 Gs
405.9 mT
41.82 kg / 92.19 LBS
41816.3 g / 410.2 N
critical level
10 mm 3027 Gs
302.7 mT
23.26 kg / 51.29 LBS
23264.1 g / 228.2 N
critical level
15 mm 2215 Gs
221.5 mT
12.45 kg / 27.45 LBS
12451.1 g / 122.1 N
critical level
20 mm 1619 Gs
161.9 mT
6.66 kg / 14.67 LBS
6656.2 g / 65.3 N
medium risk
30 mm 899 Gs
89.9 mT
2.05 kg / 4.52 LBS
2051.1 g / 20.1 N
medium risk
50 mm 340 Gs
34.0 mT
0.29 kg / 0.65 LBS
292.8 g / 2.9 N
low risk

Table 2: Vertical load (wall)
MW 45x35 / N38

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

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 LBS
20694.0 g / 203.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
13.80 kg / 30.41 LBS
13796.0 g / 135.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
6.90 kg / 15.21 LBS
6898.0 g / 67.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
34.49 kg / 76.04 LBS
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 LBS
2299.3 g / 22.6 N
1 mm
8%
5.75 kg / 12.67 LBS
5748.3 g / 56.4 N
2 mm
17%
11.50 kg / 25.35 LBS
11496.7 g / 112.8 N
3 mm
25%
17.25 kg / 38.02 LBS
17245.0 g / 169.2 N
5 mm
42%
28.74 kg / 63.36 LBS
28741.7 g / 282.0 N
10 mm
83%
57.48 kg / 126.73 LBS
57483.3 g / 563.9 N
11 mm
92%
63.23 kg / 139.40 LBS
63231.7 g / 620.3 N
12 mm
100%
68.98 kg / 152.07 LBS
68980.0 g / 676.7 N

Table 5: Thermal stability (material behavior) - thermal limit
MW 45x35 / N38

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

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 45x35 / N38

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

Table 7: Safety (HSE) (implants) - warnings
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
Mobile device 40 Gs (4.0 mT) 12.5 cm
Remote 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: Dynamics (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: Surface protection spec
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: Construction 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: Physics of underwater searching
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

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

2. Plate thickness effect

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

3. Temperature resistance

*For standard magnets, 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

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.

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: 010074-2026
Magnet Unit Converter
Pulling force

Magnetic Induction

Other proposals

The presented product is an incredibly powerful rod magnet, made from modern NdFeB material, which, with dimensions of Ø45x35 mm, guarantees the highest energy density. The MW 45x35 / N38 model boasts a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 68.98 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself 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 cylindrical magnet is indispensable in electronics 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 automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø45x35), 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 35 mm. The value of 676.73 N means that the magnet is capable of holding a weight many times exceeding its own mass of 417.49 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

Apart from their strong magnetism, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets perfectly resist against demagnetization caused by foreign field sources,
  • A magnet with a smooth nickel surface looks better,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to versatility in constructing and the capacity to modify to unusual requirements,
  • Universal use in modern technologies – they are used in HDD drives, electromotive mechanisms, medical devices, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in small systems

Limitations

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Limited ability of creating nuts in the magnet and complicated shapes - preferred is cover - magnetic holder.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum magnetic pulling forcewhat it depends on?

Holding force of 68.98 kg is a theoretical maximum value executed under the following configuration:
  • using a plate made of high-permeability steel, acting as a ideal flux conductor
  • whose transverse dimension reaches at least 10 mm
  • with a plane free of scratches
  • without any clearance between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at ambient temperature room level

Lifting capacity in practice – influencing factors

Holding efficiency impacted by specific conditions, mainly (from most important):
  • Distance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Plate material – low-carbon steel gives the best results. Alloy steels reduce magnetic properties and lifting capacity.
  • Surface finish – full contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Conscious usage

Handle magnets with awareness. Their huge power can shock even experienced users. Plan your moves and respect their power.

Crushing force

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

Protective goggles

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

GPS Danger

An intense magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Keep magnets near a device to avoid damaging the sensors.

Avoid contact if allergic

Medical facts indicate that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands and opt for encased magnets.

Warning for heart patients

People with a heart stimulator should keep an large gap from magnets. The magnetic field can disrupt the functioning of the implant.

Electronic devices

Very strong magnetic fields can erase data on credit cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

Dust is flammable

Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

No play value

Strictly store magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are tragic.

Operating temperature

Regular neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

Caution! Want to know more? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98