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MW 40x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010066

GTIN/EAN: 5906301810650

Diameter Ø

40 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

94.25 g

Magnetization Direction

↑ axial

Load capacity

27.73 kg / 271.99 N

Magnetic Induction

277.22 mT / 2772 Gs

Coating

[NiCuNi] Nickel

technical details »

36.57 ZŁ with VAT / pcs + price for transport

29.73 ZŁ net + 23% VAT / pcs

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Technical details - MW 40x10 / N38 - cylindrical magnet

Specification / characteristics - MW 40x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010066
GTIN/EAN 5906301810650
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 10 mm [±0,1 mm]
Weight 94.25 g
Magnetization Direction ↑ axial
Load capacity ~ ? 27.73 kg / 271.99 N
Magnetic Induction ~ ? 277.22 mT / 2772 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 40x10 / 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

Engineering analysis of the magnet - technical parameters

The following values are the result of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Operational parameters may differ. Use these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs gap) - power drop
MW 40x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2772 Gs
277.2 mT
 27.73 kg / 61.13 lbs
27730.0 g / 272.0 N
 crushing
1 mm 2678 Gs
267.8 mT
 25.89 kg / 57.08 lbs
25889.6 g / 254.0 N
 crushing
2 mm 2573 Gs
257.3 mT
 23.89 kg / 52.68 lbs
23893.3 g / 234.4 N
 crushing
3 mm 2459 Gs
245.9 mT
 21.83 kg / 48.12 lbs
21827.6 g / 214.1 N
 crushing
5 mm 2216 Gs
221.6 mT
 17.73 kg / 39.08 lbs
17728.1 g / 173.9 N
 crushing
10 mm 1611 Gs
161.1 mT
 9.37 kg / 20.66 lbs
9371.0 g / 91.9 N
 medium risk
15 mm 1121 Gs
112.1 mT
 4.54 kg / 10.01 lbs
4538.6 g / 44.5 N
 medium risk
20 mm 775 Gs
77.5 mT
 2.17 kg / 4.77 lbs
2165.8 g / 21.2 N
 medium risk
30 mm 387 Gs
38.7 mT
 0.54 kg / 1.19 lbs
539.8 g / 5.3 N
 weak grip
50 mm 125 Gs
12.5 mT
 0.06 kg / 0.12 lbs
56.6 g / 0.6 N
 weak grip
Magnetic force decreases significantly with every subsequent millimeter of spacing. Keep in mind that even a very thin break (e.g., dirt, paint, rust) strongly reduces the pull force. Magnets hold strongest during direct contact; distance weakens the force. See how rapidly the parameters plummet, when the product does not adhere directly to the metal substrate. When designing the assembly, discard redundant distances.

Table 2: Vertical load (wall)
MW 40x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 5.55 kg / 12.23 lbs
5546.0 g / 54.4 N
1 mm Stal (~0.2) 5.18 kg / 11.42 lbs
5178.0 g / 50.8 N
2 mm Stal (~0.2) 4.78 kg / 10.53 lbs
4778.0 g / 46.9 N
3 mm Stal (~0.2) 4.37 kg / 9.63 lbs
4366.0 g / 42.8 N
5 mm Stal (~0.2) 3.55 kg / 7.82 lbs
3546.0 g / 34.8 N
10 mm Stal (~0.2) 1.87 kg / 4.13 lbs
1874.0 g / 18.4 N
15 mm Stal (~0.2) 0.91 kg / 2.00 lbs
908.0 g / 8.9 N
20 mm Stal (~0.2) 0.43 kg / 0.96 lbs
434.0 g / 4.3 N
30 mm Stal (~0.2) 0.11 kg / 0.24 lbs
108.0 g / 1.1 N
50 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 N
The table below presents the approximate shear load required to initiate the downward movement of the magnet downwards against a upright steel plate (assuming typical friction coefficient). The holding force is relative to the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 40x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
8.32 kg / 18.34 lbs
8319.0 g / 81.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
5.55 kg / 12.23 lbs
5546.0 g / 54.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.77 kg / 6.11 lbs
2773.0 g / 27.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
13.87 kg / 30.57 lbs
13865.0 g / 136.0 N
When placing a element on a upright surface (e.g., a board), it will only hold barely approx. 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient mean that magnets slide down faster than they pull off. Want to create a wall mount? Note that the sliding force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the magnet will slip down under a significantly smaller weight. Application of an anti-slip layer can effectively improve the result.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 40x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.39 kg / 3.06 lbs
1386.5 g / 13.6 N
1 mm
13%
 3.47 kg / 7.64 lbs
3466.3 g / 34.0 N
2 mm
25%
 6.93 kg / 15.28 lbs
6932.5 g / 68.0 N
3 mm
38%
 10.40 kg / 22.93 lbs
10398.8 g / 102.0 N
5 mm
63%
 17.33 kg / 38.21 lbs
17331.3 g / 170.0 N
10 mm
100%
 27.73 kg / 61.13 lbs
27730.0 g / 272.0 N
11 mm
100%
 27.73 kg / 61.13 lbs
27730.0 g / 272.0 N
12 mm
100%
 27.73 kg / 61.13 lbs
27730.0 g / 272.0 N
A thin metal plate is incapable of conduct the full magnetic flux, which squanders power of the holder. If you install a neodymium to a weak sheet, the field will penetrate right through and the attraction force will be weaker. To squeeze 100% of this neodymium's potential, you require a sufficiently solid backing of steel. The saturation phenomenon means that on thin elements (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel dimension according to the table below.

Table 5: Thermal stability (stability) - thermal limit
MW 40x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 27.73 kg / 61.13 lbs
27730.0 g / 272.0 N
 OK
40 °C -2.2% 27.12 kg / 59.79 lbs
27119.9 g / 266.0 N
 OK
60 °C -4.4% 26.51 kg / 58.44 lbs
26509.9 g / 260.1 N
80 °C -6.6% 25.90 kg / 57.10 lbs
25899.8 g / 254.1 N
100 °C -28.8% 19.74 kg / 43.53 lbs
19743.8 g / 193.7 N
Classic neodymiums irreversibly lose parameters past the thermal threshold. Protect against heat – high temperature can permanently demagnetize this magnet. As the temperature rises, the neodymium's capacity momentarily decreases. Refrain from using this product close to heaters higher than its operating temperature limit. Ignoring the limit will lead to permanent loss of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Thin magnets (pancake types) risk losing magnetic properties sooner compared to rod magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 40x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 59.52 kg / 131.22 lbs
4 382 Gs
8.93 kg / 19.68 lbs
8928 g / 87.6 N
 N/A
1 mm 57.61 kg / 127.01 lbs
5 454 Gs
8.64 kg / 19.05 lbs
8642 g / 84.8 N
 51.85 kg / 114.31 lbs
~0 Gs
2 mm 55.57 kg / 122.52 lbs
5 357 Gs
8.34 kg / 18.38 lbs
8336 g / 81.8 N
 50.01 kg / 110.26 lbs
~0 Gs
3 mm 53.46 kg / 117.85 lbs
5 254 Gs
8.02 kg / 17.68 lbs
8019 g / 78.7 N
 48.11 kg / 106.07 lbs
~0 Gs
5 mm 49.08 kg / 108.20 lbs
5 034 Gs
7.36 kg / 16.23 lbs
7362 g / 72.2 N
 44.17 kg / 97.38 lbs
~0 Gs
10 mm 38.05 kg / 83.89 lbs
4 433 Gs
5.71 kg / 12.58 lbs
5708 g / 56.0 N
 34.25 kg / 75.50 lbs
~0 Gs
20 mm 20.11 kg / 44.35 lbs
3 223 Gs
3.02 kg / 6.65 lbs
3017 g / 29.6 N
 18.10 kg / 39.91 lbs
~0 Gs
50 mm 2.27 kg / 5.01 lbs
1 083 Gs
0.34 kg / 0.75 lbs
341 g / 3.3 N
 2.05 kg / 4.51 lbs
~0 Gs
60 mm 1.16 kg / 2.55 lbs
773 Gs
0.17 kg / 0.38 lbs
174 g / 1.7 N
 1.04 kg / 2.30 lbs
~0 Gs
70 mm 0.62 kg / 1.36 lbs
565 Gs
0.09 kg / 0.20 lbs
93 g / 0.9 N
 0.56 kg / 1.23 lbs
~0 Gs
80 mm 0.35 kg / 0.76 lbs
422 Gs
0.05 kg / 0.11 lbs
52 g / 0.5 N
 0.31 kg / 0.69 lbs
~0 Gs
90 mm 0.20 kg / 0.44 lbs
322 Gs
0.03 kg / 0.07 lbs
30 g / 0.3 N
 0.18 kg / 0.40 lbs
~0 Gs
100 mm 0.12 kg / 0.27 lbs
251 Gs
0.02 kg / 0.04 lbs
18 g / 0.2 N
 0.11 kg / 0.24 lbs
~0 Gs
Two strong neodymiums interact from a much further distance than a magnet and sheet setup. The connection of magnet-to-magnet generates a stronger field and a further horizon of performance. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is huge. The levitation is slightly lower than the attraction, but still impressive.
*Field value in repulsion mode reaches ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Results apply to friction force of dual same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - warnings
MW 40x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.5 cm
Hearing aid 10 Gs (1.0 mT) 13.0 cm
Timepiece 20 Gs (2.0 mT) 10.5 cm
Mobile device 40 Gs (4.0 mT) 8.0 cm
Car key 50 Gs (5.0 mT) 7.5 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 is a real danger to electronics as well as pacemakers. These magnets generate a field that destroys function of digital equipment. Be aware: the invisible magnetic field passes through tissues and glass. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MW 40x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.63 km/h
(5.73 m/s)
 1.55 J
30 mm 30.32 km/h
(8.42 m/s)
 3.34 J
50 mm 38.73 km/h
(10.76 m/s)
 5.45 J
100 mm 54.71 km/h
(15.20 m/s)
 10.88 J
NdFeB products are prone to chipping – a collision with steel risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Corrosion resistance
MW 40x10 / 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 (Flux)
MW 40x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 38 700 Mx 387.0 µWb
Pc Coefficient 0.35 Low (Flat)
Flux value emitted by the magnet pole. Key data for generator designers as well as sensors. Pc value determines the magnet's operating point.

Table 11: Submerged application
MW 40x10 / N38

Environment Effective steel pull Effect
Air (land) 27.73 kg Standard
Water (riverbed) 31.75 kg
(+4.02 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Shear force

*Caution: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.

2. Plate thickness effect

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

3. Temperature resistance

*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) = 0.35

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%
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: 010066-2026
Measurement Calculator
Force (pull)
Magnetic Induction
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This product is an incredibly powerful cylinder magnet, manufactured from durable NdFeB material, which, at dimensions of Ø40x10 mm, guarantees maximum efficiency. This specific item features high dimensional repeatability and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 27.73 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 271.99 N with a weight of only 94.25 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 stability 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 frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need even stronger magnets in the same volume (Ø40x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø40x10 mm, which, at a weight of 94.25 g, makes it an element with impressive magnetic energy density. The value of 271.99 N means that the magnet is capable of holding a weight many times exceeding its own mass of 94.25 g. 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. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized through the diameter if your project requires it.

Pros and cons of neodymium magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose power, even over nearly 10 years – the drop in strength is only ~1% (theoretically),
  • Neodymium magnets are distinguished by remarkably resistant to magnetic field loss caused by external magnetic fields,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to look better,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of detailed shaping as well as adjusting to complex requirements,
  • Key role in advanced technology sectors – they serve a role in hard drives, electromotive mechanisms, precision medical tools, and modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease their strength 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 durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating threads and complex shapes in magnets, we recommend using casing - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small elements of these magnets can be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Best holding force of the magnet in ideal parameters – what affects it?

The declared magnet strength concerns the limit force, recorded under optimal environment, namely:
  • on a base made of structural steel, effectively closing the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • characterized by smoothness
  • with total lack of distance (no coatings)
  • for force acting at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual holding force depends on many variables, listed from most significant:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Plate material – mild steel attracts best. Alloy steels lower magnetic properties and lifting capacity.
  • Plate texture – ground elements ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
  • Temperature – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Operating temperature

Keep cool. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Machining danger

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

Choking Hazard

Always keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets connecting inside the body are life-threatening.

Magnetic interference

GPS units and smartphones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Allergic reactions

Medical facts indicate that nickel (the usual finish) is a potent allergen. For allergy sufferers, avoid direct skin contact or select versions in plastic housing.

Danger to pacemakers

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Protective goggles

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

Bodily injuries

Pinching hazard: The pulling power is so great that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.

Magnetic media

Device Safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Powerful field

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

Security! Looking for details? Check our post: Why are neodymium magnets dangerous?