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MW 70x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010096

GTIN/EAN: 5906301810957

5.00

Diameter Ø

70 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

865.9 g

Magnetization Direction

↑ axial

Load capacity

144.18 kg / 1414.37 N

Magnetic Induction

403.43 mT / 4034 Gs

Coating

[NiCuNi] Nickel

product parameters »

317.17 ZŁ with VAT / pcs + price for transport

257.86 ZŁ net + 23% VAT / pcs

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Technical - MW 70x30 / N38 - cylindrical magnet

Specification / characteristics - MW 70x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010096
GTIN/EAN 5906301810957
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 30 mm [±0,1 mm]
Weight 865.9 g
Magnetization Direction ↑ axial
Load capacity ~ ? 144.18 kg / 1414.37 N
Magnetic Induction ~ ? 403.43 mT / 4034 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 70x30 / 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 assembly - technical parameters

These data are the outcome of a mathematical analysis. Results are based on models for the class Nd2Fe14B. Real-world parameters may differ. Treat these data as a supplementary guide for designers.

Table 1: Static pull force (pull vs gap) - power drop
MW 70x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4034 Gs
403.4 mT
 144.18 kg / 317.86 LBS
144180.0 g / 1414.4 N
 critical level
1 mm 3934 Gs
393.4 mT
 137.11 kg / 302.27 LBS
137108.9 g / 1345.0 N
 critical level
2 mm 3830 Gs
383.0 mT
 129.96 kg / 286.52 LBS
129962.6 g / 1274.9 N
 critical level
3 mm 3724 Gs
372.4 mT
 122.86 kg / 270.87 LBS
122863.7 g / 1205.3 N
 critical level
5 mm 3507 Gs
350.7 mT
 108.99 kg / 240.28 LBS
108989.8 g / 1069.2 N
 critical level
10 mm 2963 Gs
296.3 mT
 77.77 kg / 171.46 LBS
77773.1 g / 763.0 N
 critical level
15 mm 2452 Gs
245.2 mT
 53.26 kg / 117.41 LBS
53257.6 g / 522.5 N
 critical level
20 mm 2003 Gs
200.3 mT
 35.55 kg / 78.38 LBS
35554.2 g / 348.8 N
 critical level
30 mm 1321 Gs
132.1 mT
 15.45 kg / 34.06 LBS
15450.6 g / 151.6 N
 critical level
50 mm 601 Gs
60.1 mT
 3.20 kg / 7.05 LBS
3199.7 g / 31.4 N
 warning
Magnetic force decreases sharply with every subsequent millimeter of distance. Keep in mind that even a very thin break (e.g., contamination, paint, veneer) noticeably diminishes the holding power. Magnetic products hold most effectively in perfect adhesion; distance nullifies the force. See how rapidly the parameters fall, when the magnet does not adhere tightly to the steel surface. When calculating the assembly, eliminate additional spacers.

Table 2: Shear load (wall)
MW 70x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 28.84 kg / 63.57 LBS
28836.0 g / 282.9 N
1 mm Stal (~0.2) 27.42 kg / 60.46 LBS
27422.0 g / 269.0 N
2 mm Stal (~0.2) 25.99 kg / 57.30 LBS
25992.0 g / 255.0 N
3 mm Stal (~0.2) 24.57 kg / 54.17 LBS
24572.0 g / 241.1 N
5 mm Stal (~0.2) 21.80 kg / 48.06 LBS
21798.0 g / 213.8 N
10 mm Stal (~0.2) 15.55 kg / 34.29 LBS
15554.0 g / 152.6 N
15 mm Stal (~0.2) 10.65 kg / 23.48 LBS
10652.0 g / 104.5 N
20 mm Stal (~0.2) 7.11 kg / 15.67 LBS
7110.0 g / 69.7 N
30 mm Stal (~0.2) 3.09 kg / 6.81 LBS
3090.0 g / 30.3 N
50 mm Stal (~0.2) 0.64 kg / 1.41 LBS
640.0 g / 6.3 N
The following data indicates the approximate holding capacity needed to cause the slippage of the magnet down on a vertical steel wall (assuming standard friction). The holding force varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 70x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
43.25 kg / 95.36 LBS
43254.0 g / 424.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
28.84 kg / 63.57 LBS
28836.0 g / 282.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
14.42 kg / 31.79 LBS
14418.0 g / 141.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
72.09 kg / 158.93 LBS
72090.0 g / 707.2 N
When placing a element on a vertical plane (e.g., a car body), it you can count on only approx. 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip mean that products slide down faster than they pull off. Planning a vertical fastening? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a much lighter weight. Using a rubber layer can drastically improve the result.

Table 4: Material efficiency (saturation) - power losses
MW 70x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 4.81 kg / 10.60 LBS
4806.0 g / 47.1 N
1 mm
8%
 12.01 kg / 26.49 LBS
12015.0 g / 117.9 N
2 mm
17%
 24.03 kg / 52.98 LBS
24030.0 g / 235.7 N
3 mm
25%
 36.05 kg / 79.47 LBS
36045.0 g / 353.6 N
5 mm
42%
 60.08 kg / 132.44 LBS
60075.0 g / 589.3 N
10 mm
83%
 120.15 kg / 264.89 LBS
120150.0 g / 1178.7 N
11 mm
92%
 132.17 kg / 291.37 LBS
132165.0 g / 1296.5 N
12 mm
100%
 144.18 kg / 317.86 LBS
144180.0 g / 1414.4 N
A too thin steel is incapable of focus the full magnetic flux, which weakens actual performance of the holder. Should you attach a powerful product to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To utilize 100% of this neodymium's potential, you need a suitably thick piece of metal. The saturation effect means that on sheet metal structures (e.g., appliance housings), the magnet shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal resistance (material behavior) - power drop
MW 70x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 144.18 kg / 317.86 LBS
144180.0 g / 1414.4 N
 OK
40 °C -2.2% 141.01 kg / 310.87 LBS
141008.0 g / 1383.3 N
 OK
60 °C -4.4% 137.84 kg / 303.88 LBS
137836.1 g / 1352.2 N
80 °C -6.6% 134.66 kg / 296.88 LBS
134664.1 g / 1321.1 N
100 °C -28.8% 102.66 kg / 226.32 LBS
102656.2 g / 1007.1 N
Classic neodymiums lose strength above the temperature limit. Avoid high temperatures – excessive heat can permanently destroy this product. With increasing heat, the neodymium's force temporarily lowers. Do not use this magnet close to ovens higher than its safe range. Too high temperature will cause destruction of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization sooner than taller cylinders. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MW 70x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 386.08 kg / 851.15 LBS
5 354 Gs
57.91 kg / 127.67 LBS
57911 g / 568.1 N
 N/A
1 mm 376.71 kg / 830.51 LBS
7 969 Gs
56.51 kg / 124.58 LBS
56507 g / 554.3 N
 339.04 kg / 747.46 LBS
~0 Gs
2 mm 367.14 kg / 809.41 LBS
7 867 Gs
55.07 kg / 121.41 LBS
55071 g / 540.2 N
 330.43 kg / 728.47 LBS
~0 Gs
3 mm 357.57 kg / 788.30 LBS
7 764 Gs
53.63 kg / 118.24 LBS
53635 g / 526.2 N
 321.81 kg / 709.47 LBS
~0 Gs
5 mm 338.48 kg / 746.21 LBS
7 554 Gs
50.77 kg / 111.93 LBS
50772 g / 498.1 N
 304.63 kg / 671.59 LBS
~0 Gs
10 mm 291.85 kg / 643.41 LBS
7 014 Gs
43.78 kg / 96.51 LBS
43777 g / 429.5 N
 262.66 kg / 579.07 LBS
~0 Gs
20 mm 208.26 kg / 459.13 LBS
5 925 Gs
31.24 kg / 68.87 LBS
31238 g / 306.4 N
 187.43 kg / 413.21 LBS
~0 Gs
50 mm 62.81 kg / 138.47 LBS
3 254 Gs
9.42 kg / 20.77 LBS
9421 g / 92.4 N
 56.53 kg / 124.62 LBS
~0 Gs
60 mm 41.37 kg / 91.21 LBS
2 641 Gs
6.21 kg / 13.68 LBS
6206 g / 60.9 N
 37.24 kg / 82.09 LBS
~0 Gs
70 mm 27.41 kg / 60.43 LBS
2 150 Gs
4.11 kg / 9.06 LBS
4112 g / 40.3 N
 24.67 kg / 54.39 LBS
~0 Gs
80 mm 18.35 kg / 40.46 LBS
1 759 Gs
2.75 kg / 6.07 LBS
2753 g / 27.0 N
 16.52 kg / 36.41 LBS
~0 Gs
90 mm 12.45 kg / 27.44 LBS
1 449 Gs
1.87 kg / 4.12 LBS
1867 g / 18.3 N
 11.20 kg / 24.70 LBS
~0 Gs
100 mm 8.57 kg / 18.89 LBS
1 202 Gs
1.29 kg / 2.83 LBS
1285 g / 12.6 N
 7.71 kg / 17.00 LBS
~0 Gs
Two strong neodymiums attract each other from a much further distance than a magnet and steel setup. Such a system of magnet-to-magnet generates a stronger field and a larger range of action. Want to build a strong closure? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the pinch force is huge. The levitation is marginally weaker than the connection force, but still impressive.
*Flux density in repulsion mode drops to ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Results demonstrate sliding force of two matching magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - warnings
MW 70x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 34.5 cm
Hearing aid 10 Gs (1.0 mT) 27.0 cm
Mechanical watch 20 Gs (2.0 mT) 21.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 16.5 cm
Car key 50 Gs (5.0 mT) 15.0 cm
Payment card 400 Gs (40.0 mT) 6.5 cm
HDD hard drive 600 Gs (60.0 mT) 5.5 cm
Powerful magnet radiation poses a serious hazard to IT equipment as well as pacemakers. These neodymiums produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MW 70x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.84 km/h
(4.68 m/s)
 9.47 J
30 mm 24.00 km/h
(6.67 m/s)
 19.25 J
50 mm 29.50 km/h
(8.19 m/s)
 29.07 J
100 mm 41.18 km/h
(11.44 m/s)
 56.66 J
Magnetic elements are prone to chipping – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can cause material chips or injury to skin. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Corrosion resistance
MW 70x30 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Construction data (Pc)
MW 70x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 159 225 Mx 1592.3 µWb
Pc Coefficient 0.53 Low (Flat)
Flux value emitted by the pole surface. Key data when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MW 70x30 / N38

Environment Effective steel pull Effect
Air (land) 144.18 kg Standard
Water (riverbed) 165.09 kg
(+20.91 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds only a fraction of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) severely weakens 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) = 0.53

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
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: 010096-2026
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This product is an incredibly powerful cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø70x30 mm, guarantees maximum efficiency. The MW 70x30 / N38 component features an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 144.18 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 1414.37 N with a weight of only 865.9 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are suitable for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø70x30), 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 70 mm and height 30 mm. The value of 1414.37 N means that the magnet is capable of holding a weight many times exceeding its own mass of 865.9 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 30 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 diametrically if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Advantages

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even during nearly 10 years – the drop in power is only ~1% (according to tests),
  • Neodymium magnets are highly resistant to demagnetization caused by external magnetic fields,
  • By covering with a lustrous coating of nickel, the element presents an proper look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in constructing and the ability to adapt to client solutions,
  • Wide application in modern technologies – they find application in hard drives, motor assemblies, medical equipment, as well as industrial machines.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their 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 usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in creating nuts and complicated shapes in magnets, we recommend using cover - magnetic mount.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small components of these products can be problematic in diagnostics medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

The specified lifting capacity concerns the maximum value, measured under optimal environment, meaning:
  • on a base made of mild steel, perfectly concentrating the magnetic flux
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a plane free of scratches
  • under conditions of no distance (metal-to-metal)
  • under vertical application of breakaway force (90-degree angle)
  • at room temperature

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual holding force results from a number of factors, listed from crucial:
  • Distance (betwixt the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Plate material – mild steel gives the best results. Higher carbon content lower magnetic properties and lifting capacity.
  • Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate decreases the load capacity.

Precautions when working with neodymium magnets
Dust is flammable

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Protective goggles

Watch out for shards. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Impact on smartphones

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

Handling rules

Use magnets with awareness. Their immense force can surprise even experienced users. Be vigilant and respect their power.

This is not a toy

Neodymium magnets are not intended for children. Accidental ingestion of a few magnets can lead to them attracting across intestines, which constitutes a direct threat to life and necessitates urgent medical intervention.

Permanent damage

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

Metal Allergy

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

Crushing risk

Big blocks can crush fingers in a fraction of a second. Do not put your hand between two attracting surfaces.

Medical interference

Warning for patients: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Magnetic media

Very strong magnetic fields can erase data on payment cards, HDDs, and storage devices. Keep a distance of at least 10 cm.

Warning! Need more info? Check our post: Are neodymium magnets dangerous?