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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

technical parameters »

31.27 ZŁ with VAT / pcs + price for transport

25.42 ZŁ net + 23% VAT / pcs

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Product card - 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

Physical simulation of the assembly - technical parameters

Presented data are the result of a mathematical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs gap) - characteristics
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
 crushing
1 mm 2235 Gs
223.5 mT
 19.25 kg / 42.44 LBS
19252.0 g / 188.9 N
 crushing
2 mm 2156 Gs
215.6 mT
 17.92 kg / 39.50 LBS
17917.4 g / 175.8 N
 crushing
3 mm 2068 Gs
206.8 mT
 16.49 kg / 36.36 LBS
16490.6 g / 161.8 N
 crushing
5 mm 1875 Gs
187.5 mT
 13.56 kg / 29.89 LBS
13556.7 g / 133.0 N
 crushing
10 mm 1375 Gs
137.5 mT
 7.29 kg / 16.07 LBS
7287.4 g / 71.5 N
 strong
15 mm 959 Gs
95.9 mT
 3.54 kg / 7.81 LBS
3542.3 g / 34.8 N
 strong
20 mm 661 Gs
66.1 mT
 1.68 kg / 3.71 LBS
1684.9 g / 16.5 N
 low risk
30 mm 328 Gs
32.8 mT
 0.41 kg / 0.91 LBS
414.2 g / 4.1 N
 low risk
50 mm 105 Gs
10.5 mT
 0.04 kg / 0.09 LBS
42.3 g / 0.4 N
 low risk
Pulling power decreases drastically with every mm of spacing. Note that even a microscopic distance (e.g., dirt, varnish, rust) significantly weakens the grip. Magnetic products hold optimally at the point of direct contact; gap weakens the power. Observe how flashily the pull force plummet, when the magnet does not touch directly to the steel surface. When calculating the assembly, discard unnecessary gaps.

Table 2: Slippage capacity (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 defines the theoretical shear load needed to initiate the slippage of the magnet vertically on a vertical metal surface (considering typical friction coefficient). This value is relative to the air gap between the magnet and the surface.

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 hanging a magnet on a vertical surface (e.g., a board), it will only hold only about 20%-30% of its maximum pull force. Gravity as well as a weak degree of grip mean that magnets slide down faster than they pull off. Want to create a vertical fastening? Consider that the shear force is much weaker than the maximum static pull force. On a painted metal, the holder will slide down under a noticeably lighter load. Application of an anti-slip layer can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
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 too thin steel cannot focus the full magnetic flux, which wastes potential of the magnet. If you install a neodymium to a thin surface, the flux will pass right through and the attraction force will be weaker. To squeeze full efficiency of this neodymium's potential, you require a sufficiently solid element of steel. The material oversaturation means that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal resistance (material behavior) - resistance threshold
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
Classic neodymiums lose power after exceeding the maximum temperature. Protect against heat – heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's capacity momentarily lowers. Do not use this product close to heaters exceeding its operating temperature limit. Ignoring the limit will cause permanent loss of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) risk losing magnetic properties sooner than long magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MW 40x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (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 magnets attract each other from a significantly greater distance than a magnet and sheet setup. Such a system of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Designing a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the impact force is huge. The repulsion force is marginally weaker than the attraction, but still impressive.
*Flux density between like poles reaches ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Note: Estimates show shear force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (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
Mechanical watch 20 Gs (2.0 mT) 9.5 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Remote 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
Powerful magnet radiation poses a serious hazard to IT equipment and pacemakers. These NdFeB products generate a field that disrupts operation of digital equipment. Remember: the invisible magnetic field passes through tissues and plastic. Special caution must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - 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 prone to chipping – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can destroy the magnet or painful pinches to fingers. Be sure to control the product during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Corrosion resistance
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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
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 magnet's operating point.

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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains only ~20% of its max power.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely reduces 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) = 0.29

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 and environmental data
Chemical composition
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Environmental data
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 010069-2026
Measurement Calculator
Force (pull)
Magnetic Induction
Type a number in any box, and the remaining fields convert instantly.

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The offered product is an extremely powerful cylindrical magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø40x8 mm, guarantees the highest energy density. This specific item is characterized by an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 20.43 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 200.39 N with a weight of only 75.4 g, this rod is indispensable in electronics and wherever low weight is crucial.
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 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.
Magnets N38 are suitable for 90% of applications in automation and machine building, where excessive miniaturization with maximum force is not required. 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 impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 20.43 kg (force ~200.39 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 40 mm. 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.

Pros and cons of neodymium magnets.

Benefits

Besides their stability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even during approximately ten years – the decrease in power is only ~1% (based on measurements),
  • Neodymium magnets prove to be highly resistant to loss of magnetic properties caused by magnetic disturbances,
  • By applying a decorative layer of silver, the element gains an nice look,
  • Magnets have excellent magnetic induction on the surface,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of custom modeling as well as adjusting to individual applications,
  • Significant place in advanced technology sectors – they find application in hard drives, electric motors, diagnostic systems, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in small systems

Weaknesses

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using cover - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what affects it?

Breakaway force is the result of a measurement for ideal contact conditions, including:
  • with the application of a sheet made of special test steel, ensuring full magnetic saturation
  • with a thickness no less than 10 mm
  • with an ideally smooth contact surface
  • under conditions of gap-free contact (metal-to-metal)
  • under axial force vector (90-degree angle)
  • at ambient temperature room level

Determinants of practical lifting force of a magnet

It is worth knowing that the magnet holding may be lower subject to elements below, starting with the most relevant:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Base massiveness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted to the other side.
  • Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet’s surface and the plate decreases the holding force.

Safe handling of neodymium magnets
Operating temperature

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Finger safety

Large magnets can crush fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Life threat

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

Respect the power

Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Protective goggles

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets will cause them cracking into shards.

Product not for children

Strictly store magnets away from children. Choking hazard is significant, and the effects of magnets clamping inside the body are very dangerous.

Protect data

Data protection: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).

Threat to navigation

GPS units and smartphones are highly susceptible to magnetic fields. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Combustion hazard

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

Allergic reactions

It is widely known that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, refrain from direct skin contact and select encased magnets.

Safety First! Details about hazards in the article: Magnet Safety Guide.