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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

technical parameters »

104.80 ZŁ with VAT / pcs + price for transport

85.20 ZŁ net + 23% VAT / pcs

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Parameters along with shape of neodymium magnets can be reviewed using our power calculator.

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Technical details - 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

Physical modeling of the magnet - technical parameters

These data are the direct effect of a mathematical calculation. Values rely on algorithms for the material Nd2Fe14B. Actual performance might slightly differ. Use these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - 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 lbs
54730.0 g / 536.9 N
 crushing
1 mm 4900 Gs
490.0 mT
 49.43 kg / 108.98 lbs
49432.0 g / 484.9 N
 crushing
2 mm 4641 Gs
464.1 mT
 44.33 kg / 97.74 lbs
44334.0 g / 434.9 N
 crushing
3 mm 4383 Gs
438.3 mT
 39.54 kg / 87.17 lbs
39538.7 g / 387.9 N
 crushing
5 mm 3879 Gs
387.9 mT
 30.98 kg / 68.30 lbs
30981.5 g / 303.9 N
 crushing
10 mm 2773 Gs
277.3 mT
 15.83 kg / 34.89 lbs
15826.7 g / 155.3 N
 crushing
15 mm 1946 Gs
194.6 mT
 7.79 kg / 17.18 lbs
7792.9 g / 76.4 N
 warning
20 mm 1372 Gs
137.2 mT
 3.88 kg / 8.55 lbs
3877.9 g / 38.0 N
 warning
30 mm 723 Gs
72.3 mT
 1.08 kg / 2.37 lbs
1076.5 g / 10.6 N
 low risk
50 mm 258 Gs
25.8 mT
 0.14 kg / 0.30 lbs
137.4 g / 1.3 N
 low risk
Grip strength drops sharply with every mm of gap. Note that every additional insulation layer (e.g., contamination, paint, veneer) significantly weakens the grip. Magnetic products operate strongest in perfect adhesion; air break nullifies the power. Analyze how rapidly the pull force plummet, when the magnet does not touch directly to the metal substrate. When planning the assembly, eliminate additional spacers.

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 10.95 kg / 24.13 lbs
10946.0 g / 107.4 N
1 mm Stal (~0.2) 9.89 kg / 21.79 lbs
9886.0 g / 97.0 N
2 mm Stal (~0.2) 8.87 kg / 19.55 lbs
8866.0 g / 87.0 N
3 mm Stal (~0.2) 7.91 kg / 17.43 lbs
7908.0 g / 77.6 N
5 mm Stal (~0.2) 6.20 kg / 13.66 lbs
6196.0 g / 60.8 N
10 mm Stal (~0.2) 3.17 kg / 6.98 lbs
3166.0 g / 31.1 N
15 mm Stal (~0.2) 1.56 kg / 3.43 lbs
1558.0 g / 15.3 N
20 mm Stal (~0.2) 0.78 kg / 1.71 lbs
776.0 g / 7.6 N
30 mm Stal (~0.2) 0.22 kg / 0.48 lbs
216.0 g / 2.1 N
50 mm Stal (~0.2) 0.03 kg / 0.06 lbs
28.0 g / 0.3 N
The table below calculates the estimated shear load necessary to cause the sliding of the magnet downwards on a upright steel plate (assuming standard friction). This value depends on the gap size between the magnet and the surface.

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 lbs
16419.0 g / 161.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
10.95 kg / 24.13 lbs
10946.0 g / 107.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
5.47 kg / 12.07 lbs
5473.0 g / 53.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
27.37 kg / 60.33 lbs
27365.0 g / 268.5 N
When mounting a magnet on a upright surface (e.g., a board), it will maintain barely approx. 1/5 of its maximum pull force. Gravity and a weak degree of grip influence the fact that holders slip easier than they pull off. Want to create a wall mount? Note that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the magnet will slide down under a noticeably lighter cargo. Using a rubber pad can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 40x30 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
 1.82 kg / 4.02 lbs
1824.3 g / 17.9 N
1 mm
8%
 4.56 kg / 10.05 lbs
4560.8 g / 44.7 N
2 mm
17%
 9.12 kg / 20.11 lbs
9121.7 g / 89.5 N
3 mm
25%
 13.68 kg / 30.16 lbs
13682.5 g / 134.2 N
5 mm
42%
 22.80 kg / 50.27 lbs
22804.2 g / 223.7 N
10 mm
83%
 45.61 kg / 100.55 lbs
45608.3 g / 447.4 N
11 mm
92%
 50.17 kg / 110.60 lbs
50169.2 g / 492.2 N
12 mm
100%
 54.73 kg / 120.66 lbs
54730.0 g / 536.9 N
A too thin steel is incapable of absorb the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a weak sheet, the flux will pass right through and the holding will be smaller. To utilize full efficiency of this neodymium's power, you require a sufficiently solid element of metal. The material oversaturation causes that on thin elements (e.g., thin profiles), the magnet works worse. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - power drop
MW 40x30 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 54.73 kg / 120.66 lbs
54730.0 g / 536.9 N
 OK
40 °C -2.2% 53.53 kg / 118.00 lbs
53525.9 g / 525.1 N
 OK
60 °C -4.4% 52.32 kg / 115.35 lbs
52321.9 g / 513.3 N
 OK
80 °C -6.6% 51.12 kg / 112.70 lbs
51117.8 g / 501.5 N
100 °C -28.8% 38.97 kg / 85.91 lbs
38967.8 g / 382.3 N
Ordinary NdFeB products irreversibly lose parameters after exceeding the maximum temperature. Protect against heat – high temperature can permanently damage this product. With every degree above norm, the neodymium's force temporarily decreases. Refrain from using this product in hot environments higher than its operating temperature limit. Too high temperature will cause destruction of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (pancake types) may lose charge permanently sooner than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 40x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 205.97 kg / 454.08 lbs
5 879 Gs
30.89 kg / 68.11 lbs
30895 g / 303.1 N
 N/A
1 mm 195.99 kg / 432.09 lbs
10 060 Gs
29.40 kg / 64.81 lbs
29399 g / 288.4 N
 176.39 kg / 388.88 lbs
~0 Gs
2 mm 186.03 kg / 410.12 lbs
9 800 Gs
27.90 kg / 61.52 lbs
27904 g / 273.7 N
 167.42 kg / 369.11 lbs
~0 Gs
3 mm 176.30 kg / 388.68 lbs
9 541 Gs
26.45 kg / 58.30 lbs
26445 g / 259.4 N
 158.67 kg / 349.81 lbs
~0 Gs
5 mm 157.67 kg / 347.60 lbs
9 023 Gs
23.65 kg / 52.14 lbs
23650 g / 232.0 N
 141.90 kg / 312.84 lbs
~0 Gs
10 mm 116.59 kg / 257.04 lbs
7 759 Gs
17.49 kg / 38.56 lbs
17489 g / 171.6 N
 104.93 kg / 231.34 lbs
~0 Gs
20 mm 59.56 kg / 131.31 lbs
5 545 Gs
8.93 kg / 19.70 lbs
8934 g / 87.6 N
 53.60 kg / 118.18 lbs
~0 Gs
50 mm 7.52 kg / 16.58 lbs
1 971 Gs
1.13 kg / 2.49 lbs
1128 g / 11.1 N
 6.77 kg / 14.92 lbs
~0 Gs
60 mm 4.05 kg / 8.93 lbs
1 446 Gs
0.61 kg / 1.34 lbs
608 g / 6.0 N
 3.65 kg / 8.04 lbs
~0 Gs
70 mm 2.28 kg / 5.03 lbs
1 085 Gs
0.34 kg / 0.75 lbs
342 g / 3.4 N
 2.05 kg / 4.53 lbs
~0 Gs
80 mm 1.34 kg / 2.96 lbs
832 Gs
0.20 kg / 0.44 lbs
201 g / 2.0 N
 1.21 kg / 2.66 lbs
~0 Gs
90 mm 0.82 kg / 1.80 lbs
650 Gs
0.12 kg / 0.27 lbs
123 g / 1.2 N
 0.74 kg / 1.62 lbs
~0 Gs
100 mm 0.52 kg / 1.14 lbs
517 Gs
0.08 kg / 0.17 lbs
78 g / 0.8 N
 0.47 kg / 1.03 lbs
~0 Gs
Two magnets interact from a much further distance than a magnet and steel combination. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of action. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the collision energy is extreme. The levitation is slightly lower than the attraction, but still large.
*Field value between like poles is approximately ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Note: Calculations apply to friction force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - 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
Phone / Smartphone 40 Gs (4.0 mT) 11.0 cm
Car key 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
Powerful magnet radiation is a serious hazard to electronic devices and medical implants. These neodymiums generate a field that destroys function of digital equipment. Notice: the invisible magnetic field acts through matter and glass. Increased vigilance must be taken by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (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 prone to chipping – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can cause material chips or injury to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when playing with large magnets.

Table 9: Corrosion resistance
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

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 passing through the magnet pole. Key data in coil applications as well as sensors. Pc value determines 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. Wall mount (shear)

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

2. Steel thickness impact

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

3. Power loss vs temp

*For standard magnets, the critical limit 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
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This product is a very strong cylinder magnet, made from advanced NdFeB material, which, with dimensions of Ø40x30 mm, guarantees maximum efficiency. This specific item boasts a tolerance of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 54.73 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the pull force of 536.88 N with a weight of only 282.74 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need even stronger 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 warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 40 mm and height 30 mm. The key parameter here is the lifting capacity amounting to approximately 54.73 kg (force ~536.88 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface 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 diametrically if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Benefits

Apart from their superior power, neodymium magnets have these key benefits:
  • They do not lose power, even during approximately 10 years – the decrease in strength is only ~1% (according to tests),
  • Neodymium magnets remain exceptionally resistant to loss of magnetic properties caused by external interference,
  • In other words, due to the shiny finish of nickel, the element becomes visually attractive,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of accurate modeling and optimizing to individual applications,
  • Huge importance in innovative solutions – they are commonly used in hard drives, drive modules, medical devices, and technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We recommend a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these devices can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum magnetic pulling force – what affects it?

Magnet power was defined for ideal contact conditions, including:
  • using a base made of high-permeability steel, serving as a ideal flux conductor
  • with a cross-section no less than 10 mm
  • with an ground contact surface
  • under conditions of ideal adhesion (metal-to-metal)
  • during pulling in a direction vertical to the plane
  • at room temperature

Key elements affecting lifting force

Please note that the application force will differ influenced by the following factors, in order of importance:
  • Space between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. High carbon content worsen the attraction effect.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Maximum temperature

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Precision electronics

GPS units and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Metal Allergy

It is widely known that nickel (the usual finish) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands and opt for coated magnets.

Crushing force

Big blocks can smash fingers in a fraction of a second. Under no circumstances place your hand betwixt two strong magnets.

Beware of splinters

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

Electronic hazard

Avoid bringing magnets near a wallet, computer, or TV. The magnetic field can destroy these devices and erase data from cards.

Medical interference

Patients with a pacemaker have to maintain an absolute distance from magnets. The magnetic field can stop the functioning of the life-saving device.

Do not underestimate power

Handle with care. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can react.

Machining danger

Dust produced during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Danger to the youngest

Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are fatal.

Danger! Looking for details? Check our post: Are neodymium magnets dangerous?