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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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Detailed 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 modeling of the magnet - report

These information are the result of a mathematical analysis. Values were calculated on algorithms for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - 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 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
medium risk
30 mm 899 Gs
89.9 mT
2.05 kg / 4.52 pounds
2051.1 g / 20.1 N
medium risk
50 mm 340 Gs
34.0 mT
0.29 kg / 0.65 pounds
292.8 g / 2.9 N
safe

Table 2: Slippage capacity (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 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: Vertical assembly (sliding) - 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 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: 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 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 resistance (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: Magnet-Magnet interaction (repulsion) - field collision
MW 45x35 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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: Protective zones (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
Timepiece 20 Gs (2.0 mT) 16.0 cm
Mobile device 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: Dynamics (cracking risk) - collision effects
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: Corrosion resistance
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: 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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its max power.

2. Steel thickness impact

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.78

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.

Technical and environmental data
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: 010074-2026
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Pulling force

Magnetic Field

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The offered product is a very strong cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø45x35 mm, guarantees the highest energy density. The MW 45x35 / N38 model features a tolerance of ±0.1mm and professional build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 68.98 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced sensors, and efficient magnetic separators, 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 low weight is crucial.
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 two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins 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 a great economic balance and operational stability. 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 warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 45 mm and height 35 mm. The key parameter here is the holding force amounting to approximately 68.98 kg (force ~676.73 N), which, with such defined 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. 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 diametrically if your project requires it.

Pros and cons of rare earth magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:
  • They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • They feature excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • By using a decorative layer of silver, the element presents an professional look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • 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...
  • Possibility of detailed machining and adjusting to concrete conditions,
  • Huge importance in advanced technology sectors – they are commonly used in HDD drives, motor assemblies, precision medical tools, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Cons

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • At strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complex forms in magnets, we recommend using a housing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

The load parameter shown represents the peak performance, obtained under laboratory conditions, namely:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • with a thickness minimum 10 mm
  • with a surface free of scratches
  • without the slightest air gap between the magnet and steel
  • under perpendicular force vector (90-degree angle)
  • in stable room temperature

Magnet lifting force in use – key factors

Real force is affected by working environment parameters, including (from most important):
  • Air gap (betwixt the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Plate thickness – insufficiently thick steel does not close the flux, causing part of the flux to be lost into the air.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate reduces the load capacity.

Warnings
Fire warning

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Crushing risk

Big blocks can smash fingers instantly. Never put your hand betwixt two strong magnets.

Respect the power

Before use, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Protective goggles

Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets will cause them cracking into shards.

Nickel allergy

Certain individuals suffer from a contact allergy to nickel, which is the common plating for neodymium magnets. Frequent touching can result in a rash. We strongly advise use safety gloves.

Electronic hazard

Do not bring magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Maximum temperature

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. Damage is permanent.

Compass and GPS

GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Product not for children

NdFeB magnets are not toys. Accidental ingestion of a few magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates immediate surgery.

Implant safety

Warning for patients: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.

Security! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98