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MW 40x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010068

GTIN/EAN: 5906301810674

5.00

Diameter Ø

40 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

282.74 g

Magnetization Direction

→ diametrical

Load capacity

54.73 kg / 536.88 N

Magnetic Induction

515.71 mT / 5157 Gs

Coating

[NiCuNi] Nickel

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104.80 ZŁ with VAT / pcs + price for transport

85.20 ZŁ net + 23% VAT / pcs

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Technical data of the product - MW 40x30 / N38 - cylindrical magnet

Specification / characteristics - MW 40x30 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010068
GTIN/EAN 5906301810674
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 30 mm [±0,1 mm]
Weight 282.74 g
Magnetization Direction → diametrical
Load capacity ~ ? 54.73 kg / 536.88 N
Magnetic Induction ~ ? 515.71 mT / 5157 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x30 / 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 - technical parameters

The following information are the result of a physical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Actual performance may differ. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MW 40x30 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5156 Gs
515.6 mT
 54.73 kg / 120.66 pounds
54730.0 g / 536.9 N
 critical level
1 mm 4900 Gs
490.0 mT
 49.43 kg / 108.98 pounds
49432.0 g / 484.9 N
 critical level
2 mm 4641 Gs
464.1 mT
 44.33 kg / 97.74 pounds
44334.0 g / 434.9 N
 critical level
3 mm 4383 Gs
438.3 mT
 39.54 kg / 87.17 pounds
39538.7 g / 387.9 N
 critical level
5 mm 3879 Gs
387.9 mT
 30.98 kg / 68.30 pounds
30981.5 g / 303.9 N
 critical level
10 mm 2773 Gs
277.3 mT
 15.83 kg / 34.89 pounds
15826.7 g / 155.3 N
 critical level
15 mm 1946 Gs
194.6 mT
 7.79 kg / 17.18 pounds
7792.9 g / 76.4 N
 medium risk
20 mm 1372 Gs
137.2 mT
 3.88 kg / 8.55 pounds
3877.9 g / 38.0 N
 medium risk
30 mm 723 Gs
72.3 mT
 1.08 kg / 2.37 pounds
1076.5 g / 10.6 N
 weak grip
50 mm 258 Gs
25.8 mT
 0.14 kg / 0.30 pounds
137.4 g / 1.3 N
 weak grip
Magnetic force weakens significantly per each millimeter of spacing. Keep in mind that even the smallest gap (e.g., contamination, paint, veneer) noticeably diminishes the holding power. Magnetic products operate most effectively in perfect adhesion; air break kills the power. Observe how flashily the load capacity drop, when the magnet does not touch directly to the steel surface. When designing the arrangement, avoid additional spacers.

Table 2: Sliding force (wall)
MW 40x30 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 10.95 kg / 24.13 pounds
10946.0 g / 107.4 N
1 mm Stal (~0.2) 9.89 kg / 21.79 pounds
9886.0 g / 97.0 N
2 mm Stal (~0.2) 8.87 kg / 19.55 pounds
8866.0 g / 87.0 N
3 mm Stal (~0.2) 7.91 kg / 17.43 pounds
7908.0 g / 77.6 N
5 mm Stal (~0.2) 6.20 kg / 13.66 pounds
6196.0 g / 60.8 N
10 mm Stal (~0.2) 3.17 kg / 6.98 pounds
3166.0 g / 31.1 N
15 mm Stal (~0.2) 1.56 kg / 3.43 pounds
1558.0 g / 15.3 N
20 mm Stal (~0.2) 0.78 kg / 1.71 pounds
776.0 g / 7.6 N
30 mm Stal (~0.2) 0.22 kg / 0.48 pounds
216.0 g / 2.1 N
50 mm Stal (~0.2) 0.03 kg / 0.06 pounds
28.0 g / 0.3 N
The table below presents the theoretical weight limit necessary to cause the sliding of the magnet down on a vertical steel wall (assuming typical friction coefficient). The holding force depends on the separation distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MW 40x30 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
16.42 kg / 36.20 pounds
16419.0 g / 161.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
10.95 kg / 24.13 pounds
10946.0 g / 107.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
5.47 kg / 12.07 pounds
5473.0 g / 53.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
27.37 kg / 60.33 pounds
27365.0 g / 268.5 N
When hanging a element on a upright plane (e.g., a board), it will maintain just approx. 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient cause that products slide down easier than they detach. Designing a vertical fastening? Remember that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a significantly smaller weight. Application of an anti-slip coating can drastically raise the stability.

Table 4: Material efficiency (saturation) - power losses
MW 40x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 1.82 kg / 4.02 pounds
1824.3 g / 17.9 N
1 mm
8%
 4.56 kg / 10.05 pounds
4560.8 g / 44.7 N
2 mm
17%
 9.12 kg / 20.11 pounds
9121.7 g / 89.5 N
3 mm
25%
 13.68 kg / 30.16 pounds
13682.5 g / 134.2 N
5 mm
42%
 22.80 kg / 50.27 pounds
22804.2 g / 223.7 N
10 mm
83%
 45.61 kg / 100.55 pounds
45608.3 g / 447.4 N
11 mm
92%
 50.17 kg / 110.60 pounds
50169.2 g / 492.2 N
12 mm
100%
 54.73 kg / 120.66 pounds
54730.0 g / 536.9 N
A thin metal plate is unable to conduct the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To squeeze full efficiency of this magnet's power, you need a suitably thick element of steel. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the holder works worse. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - resistance threshold
MW 40x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 54.73 kg / 120.66 pounds
54730.0 g / 536.9 N
 OK
40 °C -2.2% 53.53 kg / 118.00 pounds
53525.9 g / 525.1 N
 OK
60 °C -4.4% 52.32 kg / 115.35 pounds
52321.9 g / 513.3 N
 OK
80 °C -6.6% 51.12 kg / 112.70 pounds
51117.8 g / 501.5 N
100 °C -28.8% 38.97 kg / 85.91 pounds
38967.8 g / 382.3 N
Classic neodymiums irreversibly lose strength past the thermal threshold. Watch out for overheating – heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's force briefly drops. Avoid using this product near heat sources higher than its operating temperature limit. Exceeding the critical threshold will cause permanent loss of magnetism.
*Important note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MW 40x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 205.97 kg / 454.08 pounds
5 879 Gs
30.89 kg / 68.11 pounds
30895 g / 303.1 N
 N/A
1 mm 195.99 kg / 432.09 pounds
10 060 Gs
29.40 kg / 64.81 pounds
29399 g / 288.4 N
 176.39 kg / 388.88 pounds
~0 Gs
2 mm 186.03 kg / 410.12 pounds
9 800 Gs
27.90 kg / 61.52 pounds
27904 g / 273.7 N
 167.42 kg / 369.11 pounds
~0 Gs
3 mm 176.30 kg / 388.68 pounds
9 541 Gs
26.45 kg / 58.30 pounds
26445 g / 259.4 N
 158.67 kg / 349.81 pounds
~0 Gs
5 mm 157.67 kg / 347.60 pounds
9 023 Gs
23.65 kg / 52.14 pounds
23650 g / 232.0 N
 141.90 kg / 312.84 pounds
~0 Gs
10 mm 116.59 kg / 257.04 pounds
7 759 Gs
17.49 kg / 38.56 pounds
17489 g / 171.6 N
 104.93 kg / 231.34 pounds
~0 Gs
20 mm 59.56 kg / 131.31 pounds
5 545 Gs
8.93 kg / 19.70 pounds
8934 g / 87.6 N
 53.60 kg / 118.18 pounds
~0 Gs
50 mm 7.52 kg / 16.58 pounds
1 971 Gs
1.13 kg / 2.49 pounds
1128 g / 11.1 N
 6.77 kg / 14.92 pounds
~0 Gs
60 mm 4.05 kg / 8.93 pounds
1 446 Gs
0.61 kg / 1.34 pounds
608 g / 6.0 N
 3.65 kg / 8.04 pounds
~0 Gs
70 mm 2.28 kg / 5.03 pounds
1 085 Gs
0.34 kg / 0.75 pounds
342 g / 3.4 N
 2.05 kg / 4.53 pounds
~0 Gs
80 mm 1.34 kg / 2.96 pounds
832 Gs
0.20 kg / 0.44 pounds
201 g / 2.0 N
 1.21 kg / 2.66 pounds
~0 Gs
90 mm 0.82 kg / 1.80 pounds
650 Gs
0.12 kg / 0.27 pounds
123 g / 1.2 N
 0.74 kg / 1.62 pounds
~0 Gs
100 mm 0.52 kg / 1.14 pounds
517 Gs
0.08 kg / 0.17 pounds
78 g / 0.8 N
 0.47 kg / 1.03 pounds
~0 Gs
Two magnetic products interact from a much further distance than a neodymium and metal setup. The setup of two magnets produces a massive flux and a further horizon of action. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the pinch force is huge. The levitation is marginally weaker than the attraction, but still impressive.
*Field value in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (due to field cancellation).
Attention: Calculations apply to sliding force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - warnings
MW 40x30 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 23.5 cm
Hearing aid 10 Gs (1.0 mT) 18.0 cm
Mechanical watch 20 Gs (2.0 mT) 14.0 cm
Mobile device 40 Gs (4.0 mT) 11.0 cm
Remote 50 Gs (5.0 mT) 10.0 cm
Payment card 400 Gs (40.0 mT) 4.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.5 cm
A strong magnetic field poses a real danger to electronic devices as well as pacemakers. These NdFeB products produce a field that disrupts operation of sensitive medical devices. Notice: the unseen radiation acts through matter and housings. Special caution must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MW 40x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.37 km/h
(4.55 m/s)
 2.92 J
30 mm 24.60 km/h
(6.83 m/s)
 6.60 J
50 mm 31.42 km/h
(8.73 m/s)
 10.77 J
100 mm 44.37 km/h
(12.33 m/s)
 21.48 J
Magnetic elements are delicate – a violent impact against metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can destroy the magnet or dangerous crushing to fingers. Always hold the magnet during mounting so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the magnet. Use safety goggles when playing with large magnets.

Table 9: Coating parameters (durability)
MW 40x30 / 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: Electrical data (Pc)
MW 40x30 / N38

Parameter Value SI Unit / Description
Magnetic Flux 65 488 Mx 654.9 µWb
Pc Coefficient 0.76 High (Stable)
Total magnetic flux emitted by the magnet pole. Essential parameter when building generators and motors. Pc value defines the magnet's operating point.

Table 11: Submerged application
MW 40x30 / N38

Environment Effective steel pull Effect
Air (land) 54.73 kg Standard
Water (riverbed) 62.67 kg
(+7.94 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.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Warning: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Thermal stability

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.76

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
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: 010068-2026
Magnet Unit Converter
Force (pull)
Field Strength
Type a number into a field, and the rest convert automatically.

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The presented product is an incredibly powerful rod magnet, composed of modern NdFeB material, which, with dimensions of Ø40x30 mm, guarantees maximum efficiency. The MW 40x30 / N38 component is characterized by high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 54.73 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 536.88 N with a weight of only 282.74 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 40.1 mm) using epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough for the majority 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 (Ø40x30), 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 Ø40x30 mm, which, at a weight of 282.74 g, makes it an element with impressive magnetic energy density. The value of 536.88 N means that the magnet is capable of holding a weight many times exceeding its own mass of 282.74 g. The product has a [NiCuNi] coating, which secures it against oxidation, 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. 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.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their remarkable strength, neodymium magnets offer the following advantages:
  • They have constant strength, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • They have excellent resistance to magnetic field loss as a result of opposing magnetic fields,
  • A magnet with a smooth gold surface has better aesthetics,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
  • Thanks to freedom in designing and the capacity to adapt to unusual requirements,
  • Fundamental importance in advanced technology sectors – they are used in HDD drives, electromotive mechanisms, diagnostic systems, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in small systems

Cons

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited possibility of producing nuts in the magnet and complex forms - preferred is casing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small elements of these devices are able to complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Lifting parameters

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

Breakaway force was determined for optimal configuration, including:
  • on a block made of mild steel, effectively closing the magnetic flux
  • whose thickness is min. 10 mm
  • with a plane free of scratches
  • with total lack of distance (no paint)
  • under perpendicular force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Effective lifting capacity is affected by specific conditions, mainly (from most important):
  • Space between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Base massiveness – too thin sheet causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Material type – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Operating temperature – NdFeB sinters 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 measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate reduces the holding force.

Safe handling of neodymium magnets
Beware of splinters

Protect your eyes. Magnets can explode upon uncontrolled impact, launching shards into the air. Wear goggles.

Machining danger

Dust created during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Hand protection

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

Avoid contact if allergic

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation appears, immediately stop working with magnets and use protective gear.

Do not underestimate power

Use magnets consciously. Their huge power can shock even experienced users. Stay alert and respect their power.

Impact on smartphones

A strong magnetic field negatively affects the operation of compasses in phones and navigation systems. Do not bring magnets close to a device to avoid breaking the sensors.

Danger to the youngest

Always keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets connecting inside the body are fatal.

Electronic devices

Intense magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Heat sensitivity

Standard neodymium magnets (grade N) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Danger to pacemakers

Warning for patients: Powerful magnets disrupt electronics. Keep at least 30 cm distance or request help to handle the magnets.

Important! Learn more about risks in the article: Magnet Safety Guide.