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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 data - 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 - data

Presented information constitute the direct effect of a engineering simulation. Results were calculated on models for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Please consider these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - characteristics
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
 crushing
1 mm 3934 Gs
393.4 mT
 137.11 kg / 302.27 LBS
137108.9 g / 1345.0 N
 crushing
2 mm 3830 Gs
383.0 mT
 129.96 kg / 286.52 LBS
129962.6 g / 1274.9 N
 crushing
3 mm 3724 Gs
372.4 mT
 122.86 kg / 270.87 LBS
122863.7 g / 1205.3 N
 crushing
5 mm 3507 Gs
350.7 mT
 108.99 kg / 240.28 LBS
108989.8 g / 1069.2 N
 crushing
10 mm 2963 Gs
296.3 mT
 77.77 kg / 171.46 LBS
77773.1 g / 763.0 N
 crushing
15 mm 2452 Gs
245.2 mT
 53.26 kg / 117.41 LBS
53257.6 g / 522.5 N
 crushing
20 mm 2003 Gs
200.3 mT
 35.55 kg / 78.38 LBS
35554.2 g / 348.8 N
 crushing
30 mm 1321 Gs
132.1 mT
 15.45 kg / 34.06 LBS
15450.6 g / 151.6 N
 crushing
50 mm 601 Gs
60.1 mT
 3.20 kg / 7.05 LBS
3199.7 g / 31.4 N
 medium risk
Magnetic force decreases sharply per each millimeter of gap. Note that even the smallest gap (e.g., dirt, varnish, rust) noticeably diminishes the holding power. Magnets work most effectively at the point of direct contact; air break weakens the force. Analyze how quickly the parameters drop, when the product does not adhere directly to the metal substrate. When planning the arrangement, eliminate redundant distances.

Table 2: Sliding 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 table below presents the theoretical shear load sufficient to initiate the sliding of the magnet down against a vertical metal surface (assuming typical friction). This value depends on the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - 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 surface (e.g., a car body), it will maintain barely approx. 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that products move down easier than they pull off. Designing a vertical fastening? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will give way down under a significantly smaller cargo. Utilizing a rubberized pad can drastically improve the result.

Table 4: Steel thickness (substrate influence) - 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 cannot conduct the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a weak sheet, the flux will pass right through and the pull force will drop sharply. To achieve 100% of this magnet's power, you require a sufficiently solid piece of steel. The saturation phenomenon causes that on delicate walls (e.g., thin profiles), the holder holds weaker. We advise picking the steel dimension according to the table below.

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
Standard neodymium magnets lose parameters past the thermal threshold. Protect against heat – heat can permanently damage this product. As the temperature rises, the neodymium's force briefly lowers. Do not use this product close to heaters higher than its working range. Ignoring the limit will cause permanent loss of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures compared to rod magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 70x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 magnets attract each other from a much further distance than a magnet and steel setup. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of action. Planning to create a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the pinch force is massive. The levitation is slightly lower than the connection force, but still large.
*Flux density between like poles is approximately ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
* Estimates refer to friction force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
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 large risk to IT equipment as well as medical implants. These NdFeB products produce a field that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation acts through matter and plastic. Special caution must be exercised by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
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
Neodymium magnets are very brittle – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Kinetic force 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 collision at high speed means shattering of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Anti-corrosion coating durability
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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 70x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 159 225 Mx 1592.3 µWb
Pc Coefficient 0.53 Low (Flat)
Flux value passing through the magnet pole. Key data for generator designers and motors. Pc value 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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Shear force

*Caution: On a vertical surface, the magnet retains just approx. 20-30% of its nominal pull.

2. Steel saturation

*Thin steel (e.g. computer case) drastically limits the holding force.

3. Temperature resistance

*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) = 0.53

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
Material specification
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
Magnet Unit Converter
Pulling force
Magnetic Induction
Input a figure in a single slot to see the conversion for the other units at once.

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The presented product is an extremely powerful rod magnet, composed of durable NdFeB material, which, with dimensions of Ø70x30 mm, guarantees maximum efficiency. The MW 70x30 / N38 model features high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 144.18 kg), this product is in stock 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 field concentration on a small surface counts. Thanks to the high power of 1414.37 N with a weight of only 865.9 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
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., 70.1 mm) using epoxy glues. To ensure long-term durability in automation, anaerobic resins 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 automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø70x30), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø70x30 mm, which, at a weight of 865.9 g, makes it an element with impressive magnetic energy density. 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 rod magnet 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 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.

Strengths and weaknesses of neodymium magnets.

Pros

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They retain magnetic properties for almost ten years – the drop is just ~1% (in theory),
  • They have excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • A magnet with a metallic gold surface has better aesthetics,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to versatility in forming and the capacity to customize to unusual requirements,
  • Huge importance in future technologies – they are commonly used in data components, motor assemblies, precision medical tools, as well as modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as 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
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating threads and complicated forms in magnets, we recommend using a housing - magnetic holder.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what contributes to it?

Information about lifting capacity was defined for optimal configuration, including:
  • using a sheet made of mild steel, functioning as a magnetic yoke
  • possessing a thickness of min. 10 mm to avoid saturation
  • characterized by smoothness
  • with zero gap (no paint)
  • under vertical force direction (90-degree angle)
  • at temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Real force impacted by working environment parameters, such as (from priority):
  • Clearance – existence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.

H&S for magnets
Machining danger

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.

Powerful field

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Fragile material

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Medical implants

Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Compass and GPS

A strong magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Maintain magnets near a smartphone to avoid breaking the sensors.

Safe distance

Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of min. 10 cm.

Keep away from children

Only for adults. Small elements pose a choking risk, causing serious injuries. Store away from kids and pets.

Bodily injuries

Protect your hands. Two large magnets will join immediately with a force of massive weight, destroying everything in their path. Be careful!

Warning for allergy sufferers

Some people experience a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Frequent touching might lead to dermatitis. We strongly advise use safety gloves.

Demagnetization risk

Control the heat. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Danger! Learn more about hazards in the article: Safety of working with magnets.