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MW 70x40 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010097

GTIN/EAN: 5906301810964

5.00

Diameter Ø

70 mm [±0,1 mm]

Height

40 mm [±0,1 mm]

Weight

1154.54 g

Magnetization Direction

↑ axial

Load capacity

164.24 kg / 1611.16 N

Magnetic Induction

466.52 mT / 4665 Gs

Coating

[NiCuNi] Nickel

see properties »

395.40 ZŁ with VAT / pcs + price for transport

321.46 ZŁ net + 23% VAT / pcs

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Force as well as appearance of a magnet can be estimated using our power calculator.

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Detailed specification - MW 70x40 / N38 - cylindrical magnet

Specification / characteristics - MW 70x40 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010097
GTIN/EAN 5906301810964
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 70 mm [±0,1 mm]
Height 40 mm [±0,1 mm]
Weight 1154.54 g
Magnetization Direction ↑ axial
Load capacity ~ ? 164.24 kg / 1611.16 N
Magnetic Induction ~ ? 466.52 mT / 4665 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 70x40 / 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 - report

Presented information constitute the result of a engineering simulation. Results were calculated on models for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - power drop
MW 70x40 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4665 Gs
466.5 mT
 164.24 kg / 362.09 LBS
164240.0 g / 1611.2 N
 critical level
1 mm 4538 Gs
453.8 mT
 155.47 kg / 342.75 LBS
155467.9 g / 1525.1 N
 critical level
2 mm 4409 Gs
440.9 mT
 146.74 kg / 323.52 LBS
146744.5 g / 1439.6 N
 critical level
3 mm 4279 Gs
427.9 mT
 138.20 kg / 304.68 LBS
138201.8 g / 1355.8 N
 critical level
5 mm 4017 Gs
401.7 mT
 121.81 kg / 268.54 LBS
121806.5 g / 1194.9 N
 critical level
10 mm 3376 Gs
337.6 mT
 86.03 kg / 189.65 LBS
86025.3 g / 843.9 N
 critical level
15 mm 2788 Gs
278.8 mT
 58.69 kg / 129.38 LBS
58686.8 g / 575.7 N
 critical level
20 mm 2279 Gs
227.9 mT
 39.22 kg / 86.46 LBS
39215.6 g / 384.7 N
 critical level
30 mm 1511 Gs
151.1 mT
 17.22 kg / 37.97 LBS
17222.5 g / 169.0 N
 critical level
50 mm 699 Gs
69.9 mT
 3.69 kg / 8.13 LBS
3690.0 g / 36.2 N
 warning
Grip strength decreases sharply with every subsequent millimeter of distance. Note that even a microscopic distance (e.g., dirt, paint, dust) significantly weakens the grip. Magnetic products operate strongest in perfect adhesion; gap weakens the power. Analyze how flashily the load capacity fall, when the product does not touch tightly to the steel surface. When planning the arrangement, discard additional spacers.

Table 2: Vertical capacity (vertical surface)
MW 70x40 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 32.85 kg / 72.42 LBS
32848.0 g / 322.2 N
1 mm Stal (~0.2) 31.09 kg / 68.55 LBS
31094.0 g / 305.0 N
2 mm Stal (~0.2) 29.35 kg / 64.70 LBS
29348.0 g / 287.9 N
3 mm Stal (~0.2) 27.64 kg / 60.94 LBS
27640.0 g / 271.1 N
5 mm Stal (~0.2) 24.36 kg / 53.71 LBS
24362.0 g / 239.0 N
10 mm Stal (~0.2) 17.21 kg / 37.93 LBS
17206.0 g / 168.8 N
15 mm Stal (~0.2) 11.74 kg / 25.88 LBS
11738.0 g / 115.1 N
20 mm Stal (~0.2) 7.84 kg / 17.29 LBS
7844.0 g / 76.9 N
30 mm Stal (~0.2) 3.44 kg / 7.59 LBS
3444.0 g / 33.8 N
50 mm Stal (~0.2) 0.74 kg / 1.63 LBS
738.0 g / 7.2 N
This section indicates the theoretical weight limit required to initiate the slippage of the magnet down on a upright steel plate (considering typical friction). The holding force is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 70x40 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
49.27 kg / 108.63 LBS
49272.0 g / 483.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
32.85 kg / 72.42 LBS
32848.0 g / 322.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
16.42 kg / 36.21 LBS
16424.0 g / 161.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
82.12 kg / 181.04 LBS
82120.0 g / 805.6 N
When mounting a magnet on a upright wall (e.g., a car body), it you can count on only about 1/5 of its nominal power. Gravity and a weak degree of grip mean that products slip easier than they pop off the substrate. Planning a hanger? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a much lighter weight. Application of an anti-slip layer can significantly increase the grip.

Table 4: Material efficiency (saturation) - power losses
MW 70x40 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 5.47 kg / 12.07 LBS
5474.7 g / 53.7 N
1 mm
8%
 13.69 kg / 30.17 LBS
13686.7 g / 134.3 N
2 mm
17%
 27.37 kg / 60.35 LBS
27373.3 g / 268.5 N
3 mm
25%
 41.06 kg / 90.52 LBS
41060.0 g / 402.8 N
5 mm
42%
 68.43 kg / 150.87 LBS
68433.3 g / 671.3 N
10 mm
83%
 136.87 kg / 301.74 LBS
136866.7 g / 1342.7 N
11 mm
92%
 150.55 kg / 331.91 LBS
150553.3 g / 1476.9 N
12 mm
100%
 164.24 kg / 362.09 LBS
164240.0 g / 1611.2 N
A thin sheet is not enough to focus the full magnetic flux, which wastes potential of the magnet. Should you attach a powerful product to a weak sheet, the field will pass right through and the attraction force will be weaker. To squeeze 100% of this neodymium's potential, you need a suitably thick element of steel. The saturation effect means that on sheet metal structures (e.g., car bodies), the product holds weaker. We suggest choosing the steel cross-section according to the table below.

Table 5: Working in heat (material behavior) - power drop
MW 70x40 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 164.24 kg / 362.09 LBS
164240.0 g / 1611.2 N
 OK
40 °C -2.2% 160.63 kg / 354.12 LBS
160626.7 g / 1575.7 N
 OK
60 °C -4.4% 157.01 kg / 346.15 LBS
157013.4 g / 1540.3 N
 OK
80 °C -6.6% 153.40 kg / 338.19 LBS
153400.2 g / 1504.9 N
100 °C -28.8% 116.94 kg / 257.81 LBS
116938.9 g / 1147.2 N
Ordinary NdFeB products irreversibly lose strength past the thermal threshold. Protect against heat – heat can permanently destroy this magnet. With increasing heat, the neodymium's force momentarily lowers. Do not use this magnet near heat sources exceeding its operating temperature limit. Ignoring the limit will lead to destruction of magnetic properties.
*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently under lower heat stress than taller cylinders. Warning indicator in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 70x40 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 516.26 kg / 1138.16 LBS
5 679 Gs
77.44 kg / 170.72 LBS
77439 g / 759.7 N
 N/A
1 mm 502.57 kg / 1107.98 LBS
9 205 Gs
75.39 kg / 166.20 LBS
75385 g / 739.5 N
 452.31 kg / 997.18 LBS
~0 Gs
2 mm 488.69 kg / 1077.37 LBS
9 077 Gs
73.30 kg / 161.61 LBS
73303 g / 719.1 N
 439.82 kg / 969.63 LBS
~0 Gs
3 mm 474.91 kg / 1047.01 LBS
8 948 Gs
71.24 kg / 157.05 LBS
71237 g / 698.8 N
 427.42 kg / 942.31 LBS
~0 Gs
5 mm 447.76 kg / 987.15 LBS
8 688 Gs
67.16 kg / 148.07 LBS
67164 g / 658.9 N
 402.99 kg / 888.43 LBS
~0 Gs
10 mm 382.88 kg / 844.10 LBS
8 034 Gs
57.43 kg / 126.62 LBS
57432 g / 563.4 N
 344.59 kg / 759.69 LBS
~0 Gs
20 mm 270.41 kg / 596.14 LBS
6 752 Gs
40.56 kg / 89.42 LBS
40561 g / 397.9 N
 243.37 kg / 536.53 LBS
~0 Gs
50 mm 81.66 kg / 180.03 LBS
3 710 Gs
12.25 kg / 27.01 LBS
12249 g / 120.2 N
 73.50 kg / 162.03 LBS
~0 Gs
60 mm 54.14 kg / 119.35 LBS
3 021 Gs
8.12 kg / 17.90 LBS
8120 g / 79.7 N
 48.72 kg / 107.41 LBS
~0 Gs
70 mm 36.14 kg / 79.69 LBS
2 469 Gs
5.42 kg / 11.95 LBS
5422 g / 53.2 N
 32.53 kg / 71.72 LBS
~0 Gs
80 mm 24.40 kg / 53.80 LBS
2 028 Gs
3.66 kg / 8.07 LBS
3661 g / 35.9 N
 21.96 kg / 48.42 LBS
~0 Gs
90 mm 16.70 kg / 36.82 LBS
1 678 Gs
2.51 kg / 5.52 LBS
2505 g / 24.6 N
 15.03 kg / 33.14 LBS
~0 Gs
100 mm 11.60 kg / 25.57 LBS
1 398 Gs
1.74 kg / 3.84 LBS
1740 g / 17.1 N
 10.44 kg / 23.01 LBS
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and sheet setup. Such a system of magnet-to-magnet produces a massive flux and a further horizon of performance. Designing a powerful holder? Apply two magnets instead of a neodymium and a steel. Remember that when connecting a pair of magnets, the collision energy is massive. The levitation is slightly lower than the connection force, but still significant.
*Field value for N-N configuration is approximately ~0 Gs at the geometric center of the gap (resulting from vector opposition).
* Figures refer to shear force of dual same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
MW 70x40 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 37.5 cm
Hearing aid 10 Gs (1.0 mT) 29.5 cm
Mechanical watch 20 Gs (2.0 mT) 23.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 17.5 cm
Remote 50 Gs (5.0 mT) 16.5 cm
Payment card 400 Gs (40.0 mT) 7.0 cm
HDD hard drive 600 Gs (60.0 mT) 5.5 cm
Powerful magnet radiation poses a real danger to electronics as well as medical implants. These NdFeB products produce a field that destroys function of sensitive medical devices. Be aware: the unseen radiation passes through tissues and housings. Exceptional care must be exercised by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MW 70x40 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.47 km/h
(4.30 m/s)
 10.66 J
30 mm 22.16 km/h
(6.15 m/s)
 21.87 J
50 mm 27.27 km/h
(7.58 m/s)
 33.13 J
100 mm 38.07 km/h
(10.57 m/s)
 64.55 J
Magnetic elements are very brittle – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can cause material chips or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Coating parameters (durability)
MW 70x40 / 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)
The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Pc)
MW 70x40 / N38

Parameter Value SI Unit / Description
Magnetic Flux 180 982 Mx 1809.8 µWb
Pc Coefficient 0.64 High (Stable)
Flux value emitted by the magnet pole. Essential parameter when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 70x40 / N38

Environment Effective steel pull Effect
Air (land) 164.24 kg Standard
Water (riverbed) 188.05 kg
(+23.81 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Note: On a vertical wall, the magnet holds merely ~20% of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) drastically reduces the holding force.

3. Heat tolerance

*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) = 0.64

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
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%
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: 010097-2026
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The offered product is an extremely powerful cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø70x40 mm, guarantees the highest energy density. This specific item features an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 164.24 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 1611.16 N with a weight of only 1154.54 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø70x40), 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 70 mm and height 40 mm. The value of 1611.16 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1154.54 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 40 mm), which means that the N and S poles are located on the flat, circular surfaces. 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.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • They maintain their magnetic properties even under close interference source,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of exact modeling as well as optimizing to individual requirements,
  • Wide application in modern technologies – they find application in magnetic memories, electromotive mechanisms, diagnostic systems, and complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in small systems

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We recommend casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex forms.
  • Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these magnets can be problematic in diagnostics 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

Holding force characteristics

Detachment force of the magnet in optimal conditions – what contributes to it?

The declared magnet strength concerns the limit force, recorded under laboratory conditions, meaning:
  • with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • whose transverse dimension equals approx. 10 mm
  • with a plane free of scratches
  • with zero gap (no coatings)
  • during pulling in a direction perpendicular to the plane
  • in temp. approx. 20°C

Key elements affecting lifting force

Bear in mind that the application force may be lower influenced by the following factors, in order of importance:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel type – low-carbon steel attracts best. Higher carbon content reduce magnetic permeability and lifting capacity.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Precautions when working with neodymium magnets
Cards and drives

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

Fire risk

Dust generated during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Do not underestimate power

Exercise caution. Neodymium magnets attract from a long distance and connect with huge force, often quicker than you can move away.

Threat to navigation

Note: neodymium magnets generate a field that confuses precision electronics. Maintain a safe distance from your mobile, tablet, and GPS.

Medical implants

Life threat: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Keep away from children

Adult use only. Tiny parts pose a choking risk, leading to severe trauma. Store away from children and animals.

Magnets are brittle

Protect your eyes. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.

Allergic reactions

It is widely known that nickel (standard magnet coating) is a strong allergen. For allergy sufferers, avoid direct skin contact or select versions in plastic housing.

Crushing force

Danger of trauma: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Use thick gloves.

Demagnetization risk

Regular neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. Damage is permanent.

Important! Want to know more? Read our article: Are neodymium magnets dangerous?