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MW 12x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010018

GTIN/EAN: 5906301810179

5.00

Diameter Ø

12 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

2.54 g

Magnetization Direction

↑ axial

Load capacity

2.49 kg / 24.43 N

Magnetic Induction

277.09 mT / 2771 Gs

Coating

[NiCuNi] Nickel

view technical specifications »

1.648 ZŁ with VAT / pcs + price for transport

1.340 ZŁ net + 23% VAT / pcs

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Force as well as structure of a neodymium magnet can be verified using our magnetic mass calculator.

Orders placed before 14:00 will be shipped the same business day.

Technical - MW 12x3 / N38 - cylindrical magnet

Specification / characteristics - MW 12x3 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010018
GTIN/EAN 5906301810179
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 12 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 2.54 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.49 kg / 24.43 N
Magnetic Induction ~ ? 277.09 mT / 2771 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12x3 / 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 simulation of the assembly - data

Presented values are the result of a engineering simulation. Results are based on algorithms for the material Nd2Fe14B. Operational performance may differ. Use these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - characteristics
MW 12x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2770 Gs
277.0 mT
 2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
 warning
1 mm 2420 Gs
242.0 mT
 1.90 kg / 4.19 LBS
1900.6 g / 18.6 N
 low risk
2 mm 2009 Gs
200.9 mT
 1.31 kg / 2.89 LBS
1309.4 g / 12.8 N
 low risk
3 mm 1611 Gs
161.1 mT
 0.84 kg / 1.86 LBS
842.7 g / 8.3 N
 low risk
5 mm 991 Gs
99.1 mT
 0.32 kg / 0.70 LBS
318.7 g / 3.1 N
 low risk
10 mm 313 Gs
31.3 mT
 0.03 kg / 0.07 LBS
31.8 g / 0.3 N
 low risk
15 mm 125 Gs
12.5 mT
 0.01 kg / 0.01 LBS
5.1 g / 0.0 N
 low risk
20 mm 61 Gs
6.1 mT
 0.00 kg / 0.00 LBS
1.2 g / 0.0 N
 low risk
30 mm 20 Gs
2.0 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 low risk
50 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 low risk
Pulling power weakens sharply per each millimeter of gap. Keep in mind that even a very thin break (e.g., dirt, paint, dust) noticeably reduces the pull force. Magnetic products work most effectively in perfect adhesion; gap drastically cuts the power. Notice how quickly the load capacity drop, when the magnet does not touch flatly to the steel surface. When calculating the assembly, eliminate redundant distances.

Table 2: Vertical force (wall)
MW 12x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.50 kg / 1.10 LBS
498.0 g / 4.9 N
1 mm Stal (~0.2) 0.38 kg / 0.84 LBS
380.0 g / 3.7 N
2 mm Stal (~0.2) 0.26 kg / 0.58 LBS
262.0 g / 2.6 N
3 mm Stal (~0.2) 0.17 kg / 0.37 LBS
168.0 g / 1.6 N
5 mm Stal (~0.2) 0.06 kg / 0.14 LBS
64.0 g / 0.6 N
10 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below indicates the theoretical weight limit sufficient to start the shifting of the magnet downwards along a vertical metal surface (assuming typical friction coefficient). This value is relative to the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 12x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.75 kg / 1.65 LBS
747.0 g / 7.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.50 kg / 1.10 LBS
498.0 g / 4.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.25 kg / 0.55 LBS
249.0 g / 2.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.25 kg / 2.74 LBS
1245.0 g / 12.2 N
When mounting a element on a vertical surface (e.g., a fridge), it will only hold barely approx. 1/5 of its nominal power. Gravitational force and a low friction coefficient influence the fact that holders slide down easier than they pull off. Designing a hanger? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the magnet will slip down under a noticeably lighter load. Using a rubber pad can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MW 12x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.25 kg / 0.55 LBS
249.0 g / 2.4 N
1 mm
25%
 0.62 kg / 1.37 LBS
622.5 g / 6.1 N
2 mm
50%
 1.25 kg / 2.74 LBS
1245.0 g / 12.2 N
3 mm
75%
 1.87 kg / 4.12 LBS
1867.5 g / 18.3 N
5 mm
100%
 2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
10 mm
100%
 2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
11 mm
100%
 2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
12 mm
100%
 2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
A thin metal plate is unable to focus the full magnetic flux, which squanders power of the holder. If you install a neodymium to a thin surface, the magnetism will penetrate right through and the pull force will drop sharply. To utilize 100% of this neodymium's power, you need a suitably thick piece of steel. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the holder shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Thermal stability (stability) - resistance threshold
MW 12x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
 OK
40 °C -2.2% 2.44 kg / 5.37 LBS
2435.2 g / 23.9 N
 OK
60 °C -4.4% 2.38 kg / 5.25 LBS
2380.4 g / 23.4 N
80 °C -6.6% 2.33 kg / 5.13 LBS
2325.7 g / 22.8 N
100 °C -28.8% 1.77 kg / 3.91 LBS
1772.9 g / 17.4 N
Ordinary NdFeB products irreversibly lose strength above the temperature limit. Watch out for overheating – excessive heat can permanently damage this product. As the temperature rises, the neodymium's force briefly lowers. Do not use this product close to heaters higher than its working range. Ignoring the limit will result in permanent loss of magnetism.
*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 12x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.35 kg / 11.79 LBS
4 377 Gs
0.80 kg / 1.77 LBS
802 g / 7.9 N
 N/A
1 mm 4.75 kg / 10.46 LBS
5 218 Gs
0.71 kg / 1.57 LBS
712 g / 7.0 N
 4.27 kg / 9.42 LBS
~0 Gs
2 mm 4.08 kg / 9.00 LBS
4 840 Gs
0.61 kg / 1.35 LBS
612 g / 6.0 N
 3.67 kg / 8.10 LBS
~0 Gs
3 mm 3.42 kg / 7.55 LBS
4 433 Gs
0.51 kg / 1.13 LBS
514 g / 5.0 N
 3.08 kg / 6.80 LBS
~0 Gs
5 mm 2.27 kg / 5.01 LBS
3 610 Gs
0.34 kg / 0.75 LBS
341 g / 3.3 N
 2.04 kg / 4.51 LBS
~0 Gs
10 mm 0.68 kg / 1.51 LBS
1 982 Gs
0.10 kg / 0.23 LBS
103 g / 1.0 N
 0.62 kg / 1.36 LBS
~0 Gs
20 mm 0.07 kg / 0.15 LBS
626 Gs
0.01 kg / 0.02 LBS
10 g / 0.1 N
 0.06 kg / 0.14 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
67 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
41 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
27 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
18 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
13 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
10 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products interact from a significantly greater distance than a neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of action. Planning to create a strong closure? Apply two magnets instead of one magnet and a steel. Remember that when bringing together two magnets, the collision energy is extreme. The repulsion force is slightly lower than the connection force, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Attention: Calculations refer to friction force of two same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - warnings
MW 12x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field is a large risk to IT equipment as well as medical implants. These neodymiums generate a field that disrupts operation of digital equipment. Notice: the unseen radiation acts through matter and plastic. Exceptional care must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MW 12x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 31.83 km/h
(8.84 m/s)
 0.10 J
30 mm 54.69 km/h
(15.19 m/s)
 0.29 J
50 mm 70.61 km/h
(19.61 m/s)
 0.49 J
100 mm 99.85 km/h
(27.74 m/s)
 0.98 J
Magnetic elements are delicate – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a magnet released freely becomes dangerous. Kinetic force can trigger coating fragments or injury to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed means shattering of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Surface protection spec
MW 12x3 / 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 following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 12x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 483 Mx 34.8 µWb
Pc Coefficient 0.35 Low (Flat)
Flux value passing through the pole surface. Key data in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
MW 12x3 / N38

Environment Effective steel pull Effect
Air (land) 2.49 kg Standard
Water (riverbed) 2.85 kg
(+0.36 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.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

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

2. Plate thickness effect

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.35

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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: 010018-2026
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This product is an exceptionally strong cylindrical magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø12x3 mm, guarantees the highest energy density. The MW 12x3 / 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 impressive force (approx. 2.49 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in standard 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 24.43 N with a weight of only 2.54 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 12.1 mm) using epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are suitable for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø12x3), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø12x3 mm, which, at a weight of 2.54 g, makes it an element with high magnetic energy density. The value of 24.43 N means that the magnet is capable of holding a weight many times exceeding its own mass of 2.54 g. The product has a [NiCuNi] coating, which protects the surface 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 12 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 through the diameter if your project requires it.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • They do not lose their magnetic properties even under close interference source,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of exact machining and optimizing to complex requirements,
  • Universal use in modern industrial fields – they are used in HDD drives, electric motors, medical devices, also other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating threads and complicated shapes in magnets, we recommend using cover - magnetic mount.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these products can be problematic in diagnostics medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

Highest magnetic holding force – what affects it?

Breakaway force was defined for the most favorable conditions, including:
  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a thickness of min. 10 mm to ensure full flux closure
  • with an ground touching surface
  • under conditions of gap-free contact (metal-to-metal)
  • under vertical force vector (90-degree angle)
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

Real force impacted by specific conditions, including (from most important):
  • Air gap (between the magnet and the metal), since even a very small clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Base massiveness – insufficiently thick steel does not accept the full field, causing part of the flux to be lost to the other side.
  • Material composition – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Safe handling of neodymium magnets
Data carriers

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

GPS Danger

Remember: neodymium magnets generate a field that confuses precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.

Respect the power

Before use, check safety instructions. Sudden snapping can break the magnet or injure your hand. Be predictive.

Fragile material

Protect your eyes. Magnets can fracture upon violent connection, launching sharp fragments into the air. We recommend safety glasses.

Do not give to children

Product intended for adults. Tiny parts pose a choking risk, leading to severe trauma. Keep away from kids and pets.

Demagnetization risk

Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. This process is irreversible.

Combustion hazard

Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.

Skin irritation risks

Certain individuals experience a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Extended handling may cause an allergic reaction. It is best to use safety gloves.

Serious injuries

Mind your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Health Danger

Warning for patients: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Caution! Learn more about risks in the article: Safety of working with magnets.