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MW 40x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010069

GTIN/EAN: 5906301810681

5.00

Diameter Ø

40 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

75.4 g

Magnetization Direction

↑ axial

Load capacity

20.43 kg / 200.39 N

Magnetic Induction

230.22 mT / 2302 Gs

Coating

[NiCuNi] Nickel

see technical specifications »

31.27 ZŁ with VAT / pcs + price for transport

25.42 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 40x8 / N38 - cylindrical magnet

Specification / characteristics - MW 40x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010069
GTIN/EAN 5906301810681
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 40 mm [±0,1 mm]
Height 8 mm [±0,1 mm]
Weight 75.4 g
Magnetization Direction ↑ axial
Load capacity ~ ? 20.43 kg / 200.39 N
Magnetic Induction ~ ? 230.22 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x8 / 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 assembly - report

The following values constitute the direct effect of a mathematical simulation. Values are based on models for the material Nd2Fe14B. Operational conditions might slightly differ from theoretical values. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs gap) - interaction chart
MW 40x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2302 Gs
230.2 mT
 20.43 kg / 45.04 LBS
20430.0 g / 200.4 N
 critical level
1 mm 2235 Gs
223.5 mT
 19.25 kg / 42.44 LBS
19252.0 g / 188.9 N
 critical level
2 mm 2156 Gs
215.6 mT
 17.92 kg / 39.50 LBS
17917.4 g / 175.8 N
 critical level
3 mm 2068 Gs
206.8 mT
 16.49 kg / 36.36 LBS
16490.6 g / 161.8 N
 critical level
5 mm 1875 Gs
187.5 mT
 13.56 kg / 29.89 LBS
13556.7 g / 133.0 N
 critical level
10 mm 1375 Gs
137.5 mT
 7.29 kg / 16.07 LBS
7287.4 g / 71.5 N
 warning
15 mm 959 Gs
95.9 mT
 3.54 kg / 7.81 LBS
3542.3 g / 34.8 N
 warning
20 mm 661 Gs
66.1 mT
 1.68 kg / 3.71 LBS
1684.9 g / 16.5 N
 safe
30 mm 328 Gs
32.8 mT
 0.41 kg / 0.91 LBS
414.2 g / 4.1 N
 safe
50 mm 105 Gs
10.5 mT
 0.04 kg / 0.09 LBS
42.3 g / 0.4 N
 safe
Grip strength weakens drastically per each millimeter of distance. Remember that even a microscopic distance (e.g., contamination, paint, dust) noticeably weakens the grip. Magnetic products hold strongest in perfect adhesion; distance weakens the power. Notice how rapidly the parameters fall, when the magnet does not touch flatly to the steel surface. When designing the assembly, avoid redundant distances.

Table 2: Slippage hold (vertical surface)
MW 40x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.09 kg / 9.01 LBS
4086.0 g / 40.1 N
1 mm Stal (~0.2) 3.85 kg / 8.49 LBS
3850.0 g / 37.8 N
2 mm Stal (~0.2) 3.58 kg / 7.90 LBS
3584.0 g / 35.2 N
3 mm Stal (~0.2) 3.30 kg / 7.27 LBS
3298.0 g / 32.4 N
5 mm Stal (~0.2) 2.71 kg / 5.98 LBS
2712.0 g / 26.6 N
10 mm Stal (~0.2) 1.46 kg / 3.21 LBS
1458.0 g / 14.3 N
15 mm Stal (~0.2) 0.71 kg / 1.56 LBS
708.0 g / 6.9 N
20 mm Stal (~0.2) 0.34 kg / 0.74 LBS
336.0 g / 3.3 N
30 mm Stal (~0.2) 0.08 kg / 0.18 LBS
82.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N
The table below calculates the estimated holding capacity sufficient to start the downward movement of the magnet vertically against a upright steel plate (considering typical friction). This parameter is relative to the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MW 40x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
6.13 kg / 13.51 LBS
6129.0 g / 60.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.09 kg / 9.01 LBS
4086.0 g / 40.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.04 kg / 4.50 LBS
2043.0 g / 20.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.22 kg / 22.52 LBS
10215.0 g / 100.2 N
When placing a holder on a vertical surface (e.g., a fridge), it will maintain just approx. 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient cause that holders slip easier than they pop off the substrate. Want to create a hanger? Note that the sliding force is much weaker than the maximum static pull force. On a painted metal, the holder will slide down under a significantly smaller weight. Application of an anti-slip layer can effectively improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MW 40x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.02 kg / 2.25 LBS
1021.5 g / 10.0 N
1 mm
13%
 2.55 kg / 5.63 LBS
2553.8 g / 25.1 N
2 mm
25%
 5.11 kg / 11.26 LBS
5107.5 g / 50.1 N
3 mm
38%
 7.66 kg / 16.89 LBS
7661.3 g / 75.2 N
5 mm
63%
 12.77 kg / 28.15 LBS
12768.8 g / 125.3 N
10 mm
100%
 20.43 kg / 45.04 LBS
20430.0 g / 200.4 N
11 mm
100%
 20.43 kg / 45.04 LBS
20430.0 g / 200.4 N
12 mm
100%
 20.43 kg / 45.04 LBS
20430.0 g / 200.4 N
A thin sheet is incapable of focus the entire magnetic field, which weakens actual performance of the holder. If you attach a powerful product to a too thin substrate, the flux will pass right through and the holding will be smaller. To utilize 100% of this neodymium's power, you need a suitably thick piece of steel. The saturation effect means that on delicate walls (e.g., appliance housings), the product shows lower pull force. We advise picking the steel dimension according to the table below.

Table 5: Thermal stability (stability) - thermal limit
MW 40x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 20.43 kg / 45.04 LBS
20430.0 g / 200.4 N
 OK
40 °C -2.2% 19.98 kg / 44.05 LBS
19980.5 g / 196.0 N
 OK
60 °C -4.4% 19.53 kg / 43.06 LBS
19531.1 g / 191.6 N
80 °C -6.6% 19.08 kg / 42.07 LBS
19081.6 g / 187.2 N
100 °C -28.8% 14.55 kg / 32.07 LBS
14546.2 g / 142.7 N
Standard neodymium magnets irreversibly lose parameters above the temperature limit. Avoid high temperatures – high temperature can irreversibly destroy this product. As the temperature rises, the magnet's capacity temporarily lowers. Avoid using this product close to heaters higher than its working range. Ignoring the limit will cause irreversible degradation of magnetism.
*Engineering note: Thermal stability is determined by both grade, as well as the dimension ratios. Thin magnets (low Pc) may lose charge permanently at lower temperatures compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 40x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 41.05 kg / 90.51 LBS
3 871 Gs
6.16 kg / 13.58 LBS
6158 g / 60.4 N
 N/A
1 mm 39.92 kg / 88.02 LBS
4 540 Gs
5.99 kg / 13.20 LBS
5989 g / 58.7 N
 35.93 kg / 79.22 LBS
~0 Gs
2 mm 38.69 kg / 85.29 LBS
4 469 Gs
5.80 kg / 12.79 LBS
5803 g / 56.9 N
 34.82 kg / 76.76 LBS
~0 Gs
3 mm 37.38 kg / 82.40 LBS
4 393 Gs
5.61 kg / 12.36 LBS
5606 g / 55.0 N
 33.64 kg / 74.16 LBS
~0 Gs
5 mm 34.59 kg / 76.25 LBS
4 226 Gs
5.19 kg / 11.44 LBS
5188 g / 50.9 N
 31.13 kg / 68.63 LBS
~0 Gs
10 mm 27.24 kg / 60.06 LBS
3 750 Gs
4.09 kg / 9.01 LBS
4086 g / 40.1 N
 24.52 kg / 54.05 LBS
~0 Gs
20 mm 14.64 kg / 32.28 LBS
2 750 Gs
2.20 kg / 4.84 LBS
2197 g / 21.5 N
 13.18 kg / 29.06 LBS
~0 Gs
50 mm 1.65 kg / 3.63 LBS
922 Gs
0.25 kg / 0.54 LBS
247 g / 2.4 N
 1.48 kg / 3.26 LBS
~0 Gs
60 mm 0.83 kg / 1.84 LBS
656 Gs
0.12 kg / 0.28 LBS
125 g / 1.2 N
 0.75 kg / 1.65 LBS
~0 Gs
70 mm 0.44 kg / 0.97 LBS
477 Gs
0.07 kg / 0.15 LBS
66 g / 0.6 N
 0.40 kg / 0.87 LBS
~0 Gs
80 mm 0.24 kg / 0.54 LBS
355 Gs
0.04 kg / 0.08 LBS
37 g / 0.4 N
 0.22 kg / 0.49 LBS
~0 Gs
90 mm 0.14 kg / 0.31 LBS
270 Gs
0.02 kg / 0.05 LBS
21 g / 0.2 N
 0.13 kg / 0.28 LBS
~0 Gs
100 mm 0.09 kg / 0.19 LBS
210 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
 0.08 kg / 0.17 LBS
~0 Gs
Two magnetic products interact from a wider radius than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of action. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the impact force is extreme. The repulsion force is marginally weaker than the attraction, but still large.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
Important: Results apply to sliding force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - precautionary measures
MW 40x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 15.5 cm
Hearing aid 10 Gs (1.0 mT) 12.5 cm
Timepiece 20 Gs (2.0 mT) 9.5 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Car key 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Extremely neodym field poses a large risk to IT equipment and pacemakers. These magnets generate a field that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MW 40x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.96 km/h
(5.54 m/s)
 1.16 J
30 mm 29.12 km/h
(8.09 m/s)
 2.47 J
50 mm 37.17 km/h
(10.32 m/s)
 4.02 J
100 mm 52.50 km/h
(14.58 m/s)
 8.02 J
Neodymium magnets are delicate – a collision with steel causes immediate chipping. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear eye protection when handling with large magnets.

Table 9: Coating parameters (durability)
MW 40x8 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MW 40x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 33 553 Mx 335.5 µWb
Pc Coefficient 0.29 Low (Flat)
Total magnetic flux emitted by the magnet pole. Key data when building generators as well as sensors. Pc value determines the working geometry.

Table 11: Submerged application
MW 40x8 / N38

Environment Effective steel pull Effect
Air (land) 20.43 kg Standard
Water (riverbed) 23.39 kg
(+2.96 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

*Note: On a vertical wall, the magnet holds merely approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.

3. Temperature resistance

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.29

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 specification and ecology
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%
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: 010069-2026
Measurement Calculator
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The offered product is an exceptionally strong cylindrical magnet, composed of modern NdFeB material, which, at dimensions of Ø40x8 mm, guarantees optimal power. This specific item features high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 20.43 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, 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 modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 200.39 N with a weight of only 75.4 g, this rod is indispensable in miniature devices and wherever every gram matters.
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 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 popular standard for industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need even stronger magnets in the same volume (Ø40x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
This model is characterized by dimensions Ø40x8 mm, which, at a weight of 75.4 g, makes it an element with high magnetic energy density. The value of 200.39 N means that the magnet is capable of holding a weight many times exceeding its own mass of 75.4 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 8 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 through the diameter if your project requires it.

Strengths and weaknesses of rare earth magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even over around 10 years – the decrease in strength is only ~1% (theoretically),
  • Neodymium magnets are characterized by highly resistant to loss of magnetic properties caused by external interference,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Considering the potential of free forming and customization to unique solutions, NdFeB magnets can be manufactured in a variety of forms and dimensions, which expands the range of possible applications,
  • Versatile presence in innovative solutions – they serve a role in magnetic memories, electric motors, medical devices, also multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small components of these devices can complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Maximum holding power of the magnet – what contributes to it?

The lifting capacity listed is a measurement result executed under standard conditions:
  • using a plate made of high-permeability steel, acting as a magnetic yoke
  • with a cross-section minimum 10 mm
  • characterized by lack of roughness
  • without any clearance between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Practical lifting capacity: influencing factors

Holding efficiency is influenced by working environment parameters, mainly (from most important):
  • Air gap (betwixt the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Metal 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 type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface structure – the more even the surface, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Warnings
Health Danger

For implant holders: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or ask another person to handle the magnets.

GPS and phone interference

A strong magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Keep magnets near a device to avoid breaking the sensors.

Allergy Warning

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, immediately stop working with magnets and wear gloves.

Pinching danger

Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Threat to electronics

Avoid bringing magnets near a wallet, computer, or screen. The magnetism can destroy these devices and wipe information from cards.

Demagnetization risk

Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

Eye protection

Despite the nickel coating, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Dust is flammable

Drilling and cutting of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Handling rules

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

No play value

NdFeB magnets are not suitable for play. Accidental ingestion of a few magnets can lead to them connecting inside the digestive tract, which poses a critical condition and requires urgent medical intervention.

Danger! Need more info? Read our article: Why are neodymium magnets dangerous?