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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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Product card - 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 magnet - data

The following information represent the result of a mathematical calculation. Results are based on algorithms for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Treat these data as a reference point for designers.

Table 1: Static pull force (force vs gap) - power drop
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
critical level
1 mm 4982 Gs
498.2 mT
63.01 kg / 138.91 pounds
63010.2 g / 618.1 N
critical level
2 mm 4748 Gs
474.8 mT
57.23 kg / 126.18 pounds
57234.3 g / 561.5 N
critical level
3 mm 4516 Gs
451.6 mT
51.76 kg / 114.10 pounds
51756.9 g / 507.7 N
critical level
5 mm 4059 Gs
405.9 mT
41.82 kg / 92.19 pounds
41816.3 g / 410.2 N
critical level
10 mm 3027 Gs
302.7 mT
23.26 kg / 51.29 pounds
23264.1 g / 228.2 N
critical level
15 mm 2215 Gs
221.5 mT
12.45 kg / 27.45 pounds
12451.1 g / 122.1 N
critical level
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
weak grip

Table 2: Sliding hold (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: 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 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 (substrate influence) - power losses
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: Working in heat (stability) - 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 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 (attraction) - field collision
MW 45x35 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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
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) - 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: 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: Submerged application
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

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

2. Efficiency vs thickness

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

3. Heat tolerance

*For N38 grade, the critical 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%
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
Pulling force

Field Strength

Other proposals

The offered product is an exceptionally strong rod magnet, composed of durable NdFeB material, which, with dimensions of Ø45x35 mm, guarantees the highest energy density. This specific item is characterized by a tolerance of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 68.98 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force 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 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 stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial 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 warehouse.
This model is characterized by dimensions Ø45x35 mm, which, at a weight of 417.49 g, makes it an element with impressive magnetic energy density. 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 oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 35 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 diametrically if your project requires it.

Advantages as well as disadvantages of neodymium magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They are resistant to demagnetization induced by external magnetic fields,
  • In other words, due to the smooth surface of gold, the element looks attractive,
  • The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
  • Possibility of accurate machining and adapting to specific applications,
  • Wide application in electronics industry – they are commonly used in computer drives, brushless drives, medical devices, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in miniature devices

Disadvantages

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complex forms.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these products 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 increases costs of application in large quantities

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

Holding force of 68.98 kg is a theoretical maximum value performed under specific, ideal conditions:
  • with the use of a sheet made of special test steel, guaranteeing maximum field concentration
  • whose transverse dimension equals approx. 10 mm
  • with an ideally smooth touching surface
  • with total lack of distance (no coatings)
  • during pulling in a direction perpendicular to the plane
  • at temperature room level

Determinants of lifting force in real conditions

During everyday use, the actual holding force depends on many variables, listed from most significant:
  • Clearance – the presence of any layer (paint, dirt, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Wall 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.
  • Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
  • Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets
Magnetic media

Avoid bringing magnets near a wallet, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Heat warning

Regular neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Handling guide

Handle with care. Rare earth magnets act from a long distance and connect with huge force, often quicker than you can move away.

Fragile material

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them breaking into small pieces.

Dust is flammable

Fire warning: Neodymium dust is explosive. Do not process magnets in home conditions as this may cause fire.

Warning for heart patients

Warning for patients: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Choking Hazard

Always store magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are tragic.

Threat to navigation

A powerful magnetic field negatively affects the operation of compasses in phones and GPS navigation. Maintain magnets near a smartphone to avoid breaking the sensors.

Skin irritation risks

Certain individuals suffer from a hypersensitivity to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching might lead to skin redness. We strongly advise wear safety gloves.

Physical harm

Risk of injury: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Security! Looking for details? Read our article: Are neodymium magnets dangerous?