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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

technical parameters »

1.648 ZŁ with VAT / pcs + price for transport

1.340 ZŁ net + 23% VAT / pcs

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Detailed specification - 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 - report

These information are the direct effect of a mathematical calculation. Results are based on algorithms for the class Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull 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
 medium risk
1 mm 2420 Gs
242.0 mT
 1.90 kg / 4.19 lbs
1900.6 g / 18.6 N
 weak grip
2 mm 2009 Gs
200.9 mT
 1.31 kg / 2.89 lbs
1309.4 g / 12.8 N
 weak grip
3 mm 1611 Gs
161.1 mT
 0.84 kg / 1.86 lbs
842.7 g / 8.3 N
 weak grip
5 mm 991 Gs
99.1 mT
 0.32 kg / 0.70 lbs
318.7 g / 3.1 N
 weak grip
10 mm 313 Gs
31.3 mT
 0.03 kg / 0.07 lbs
31.8 g / 0.3 N
 weak grip
15 mm 125 Gs
12.5 mT
 0.01 kg / 0.01 lbs
5.1 g / 0.0 N
 weak grip
20 mm 61 Gs
6.1 mT
 0.00 kg / 0.00 lbs
1.2 g / 0.0 N
 weak grip
30 mm 20 Gs
2.0 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 weak grip
50 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Grip strength drops sharply with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., contamination, paint, rust) strongly diminishes the holding power. Neodymiums operate strongest at the point of direct contact; gap kills the power. Notice how quickly the pull force fall, when the magnet does not touch flatly to the metal substrate. When planning the mounting, avoid additional spacers.

Table 2: Sliding load (vertical surface)
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
This section defines the estimated shear load sufficient to cause the slippage of the magnet downwards on a vertical steel plate (assuming typical friction coefficient). This value depends on the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - 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 upright plane (e.g., a fridge), it will only hold barely about 20%-30% of its nominal power. Gravity as well as a low friction coefficient mean that products slide down faster than they detach. Planning a vertical fastening? Note that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the holder will slide down under a noticeably lighter load. Using a rubber layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
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 incapable of absorb the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a thin surface, the field will pass right through and the pull force will drop sharply. To achieve 100% of this neodymium's potential, you require a sufficiently solid piece of metal. The saturation effect causes that on thin elements (e.g., car bodies), the holder works worse. We advise picking the steel dimension from these parameters.

Table 5: Working in heat (material behavior) - power drop
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
Classic neodymiums change their properties strength past the thermal threshold. Watch out for overheating – excessive heat can irreversibly damage this magnet. With increasing heat, the magnet's force temporarily decreases. Refrain from using this magnet near heat sources exceeding its safe range. Exceeding the critical threshold will result in permanent loss of magnetism.
*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 12x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 strong neodymiums interact from a wider radius than a magnet and steel combination. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of performance. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when bringing together two magnets, the collision energy is extreme. The repulsion force is slightly lower than the attraction, but still significant.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Important: Calculations demonstrate sliding force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
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
Mobile device 40 Gs (4.0 mT) 2.5 cm
Remote 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
Extremely neodym field is a large risk to electronics and medical implants. These neodymiums generate a field that prevents correct functioning of digital equipment. Remember: the invisible magnetic field acts through matter and housings. Special caution must be exercised by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
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
Neodymium magnets are prone to chipping – a collision with steel causes immediate chipping. Control the attraction moment – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
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)
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 12x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 483 Mx 34.8 µWb
Pc Coefficient 0.35 Low (Flat)
Flux value emitted by the pole surface. Key data when building generators and motors. Pc value determines the magnet's operating point.

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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

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

2. Steel saturation

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

3. Power loss vs temp

*For N38 material, the safety 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 specification and ecology
Elemental analysis
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: 010018-2026
Quick Unit Converter
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Magnetic Induction
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The presented product is an exceptionally strong cylinder magnet, composed of durable NdFeB material, which, with dimensions of Ø12x3 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 2.49 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the high power of 24.43 N with a weight of only 2.54 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. 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 high repeatability 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 (Ø12x3), 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 12 mm and height 3 mm. The key parameter here is the lifting capacity amounting to approximately 2.49 kg (force ~24.43 N), which, with such compact 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 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.

Pros and cons of neodymium magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain full power for around 10 years – the loss is just ~1% (in theory),
  • They feature excellent resistance to weakening of magnetic properties due to external fields,
  • A magnet with a shiny gold surface has an effective appearance,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to freedom in constructing and the ability to modify to unusual requirements,
  • Significant place in modern industrial fields – they are used in hard drives, electromotive mechanisms, medical devices, also modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Weaknesses

What to avoid - cons of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of making nuts in the magnet and complex forms - preferred is a housing - magnetic holder.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Maximum holding power of the magnet – what contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, taking into account:
  • using a base made of high-permeability steel, serving as a ideal flux conductor
  • with a cross-section minimum 10 mm
  • characterized by smoothness
  • without the slightest clearance between the magnet and steel
  • under axial force vector (90-degree angle)
  • at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is influenced by specific conditions, mainly (from most important):
  • Distance (betwixt the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
  • 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 maximum value.
  • Steel thickness – too thin sheet does not close the flux, causing part of the flux to be wasted into the air.
  • Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Surface condition – ground elements ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
  • Temperature influence – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet and the plate reduces the lifting capacity.

Warnings
Data carriers

Equipment safety: Strong magnets can damage payment cards and sensitive devices (heart implants, hearing aids, timepieces).

Flammability

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

Phone sensors

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Hand protection

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

Material brittleness

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Danger to pacemakers

People with a heart stimulator should keep an absolute distance from magnets. The magnetism can stop the functioning of the life-saving device.

No play value

NdFeB magnets are not intended for children. Accidental ingestion of a few magnets may result in them pinching intestinal walls, which poses a critical condition and requires urgent medical intervention.

Skin irritation risks

Certain individuals have a sensitization to nickel, which is the typical protective layer for neodymium magnets. Frequent touching might lead to an allergic reaction. We strongly advise use protective gloves.

Thermal limits

Control the heat. Heating the magnet to high heat will ruin its magnetic structure and strength.

Respect the power

Handle magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and do not underestimate their power.

Security! More info about hazards in the article: Magnet Safety Guide.