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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

Technical simulation of the magnet - data

Presented information are the direct effect of a physical calculation. Values are based on algorithms for the class Nd2Fe14B. Operational conditions might slightly differ. Please consider these calculations as a reference point for designers.

Table 1: Static pull force (pull vs gap) - interaction chart
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
weak grip

Table 2: Shear load (vertical surface)
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: Steel thickness (substrate influence) - 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 resistance (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 collision
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 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: Hazards (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: Impact energy (cracking risk) - 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 (Flux)
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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Note: On a vertical wall, the magnet holds just approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly limits 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) = 0.78

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.

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%
Environmental data
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
Force (pull)

Magnetic Field

Other products

The offered product is an extremely powerful cylinder magnet, composed of modern NdFeB material, which, at dimensions of Ø45x35 mm, guarantees maximum efficiency. The MW 45x35 / N38 model boasts high dimensional repeatability and industrial build quality, making it a perfect 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 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.
This model is created for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. 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.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. 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 in continuous sale 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 secures it 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 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.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • Their strength remains stable, and after around 10 years it drops only by ~1% (theoretically),
  • They maintain their magnetic properties even under close interference source,
  • A magnet with a metallic silver surface has better aesthetics,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Considering the potential of flexible molding and customization to specialized needs, neodymium magnets can be modeled in a wide range of geometric configurations, which amplifies use scope,
  • Universal use in modern technologies – they find application in magnetic memories, drive modules, advanced medical instruments, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of creating threads in the magnet and complicated shapes - recommended is cover - magnetic holder.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Furthermore, small components of these magnets are able to complicate diagnosis 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 holding power of the magnet – what contributes to it?

The lifting capacity listed is a theoretical maximum value executed under standard conditions:
  • using a plate made of mild steel, functioning as a magnetic yoke
  • with a thickness of at least 10 mm
  • characterized by lack of roughness
  • without the slightest insulating layer between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at temperature room level

Magnet lifting force in use – key factors

Holding efficiency is affected by specific conditions, such as (from most important):
  • Clearance – the presence of foreign body (paint, tape, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Surface finish – full contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Warnings
Allergic reactions

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop handling magnets and wear gloves.

Crushing force

Large magnets can break fingers instantly. Do not put your hand between two strong magnets.

Warning for heart patients

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Maximum temperature

Keep cool. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Caution required

Handle with care. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can move away.

Fire warning

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

Phone sensors

Be aware: neodymium magnets generate a field that interferes with precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.

Electronic devices

Avoid bringing magnets near a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

This is not a toy

Absolutely store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are very dangerous.

Magnets are brittle

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets leads to them shattering into small pieces.

Danger! Want to know more? Check our post: Are neodymium magnets dangerous?