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MW 12x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010022

GTIN/EAN: 5906301810216

5.00

Diameter Ø

12 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

6.79 g

Magnetization Direction

↑ axial

Load capacity

4.93 kg / 48.32 N

Magnetic Induction

495.50 mT / 4955 Gs

Coating

[NiCuNi] Nickel

see parameters »

2.47 ZŁ with VAT / pcs + price for transport

2.01 ZŁ net + 23% VAT / pcs

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Technical details - MW 12x8 / N38 - cylindrical magnet

Specification / characteristics - MW 12x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010022
GTIN/EAN 5906301810216
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 8 mm [±0,1 mm]
Weight 6.79 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.93 kg / 48.32 N
Magnetic Induction ~ ? 495.50 mT / 4955 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12x8 / 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 - data

These values are the result of a physical analysis. Values were calculated on models for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Use these data as a supplementary guide for designers.

Table 1: Static pull force (force vs gap) - interaction chart
MW 12x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4952 Gs
495.2 mT
 4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
 warning
1 mm 4139 Gs
413.9 mT
 3.44 kg / 7.59 pounds
3445.0 g / 33.8 N
 warning
2 mm 3356 Gs
335.6 mT
 2.26 kg / 4.99 pounds
2264.2 g / 22.2 N
 warning
3 mm 2670 Gs
267.0 mT
 1.43 kg / 3.16 pounds
1433.5 g / 14.1 N
 low risk
5 mm 1660 Gs
166.0 mT
 0.55 kg / 1.22 pounds
554.1 g / 5.4 N
 low risk
10 mm 565 Gs
56.5 mT
 0.06 kg / 0.14 pounds
64.3 g / 0.6 N
 low risk
15 mm 243 Gs
24.3 mT
 0.01 kg / 0.03 pounds
11.8 g / 0.1 N
 low risk
20 mm 124 Gs
12.4 mT
 0.00 kg / 0.01 pounds
3.1 g / 0.0 N
 low risk
30 mm 45 Gs
4.5 mT
 0.00 kg / 0.00 pounds
0.4 g / 0.0 N
 low risk
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Grip strength weakens drastically with every mm of spacing. Note that every additional insulation layer (e.g., dirt, paint, veneer) noticeably diminishes the holding power. Magnetic products work strongest in perfect adhesion; gap weakens the power. See how rapidly the load capacity fall, when the product does not touch flatly to the metal substrate. When designing the arrangement, eliminate redundant distances.

Table 2: Shear capacity (vertical surface)
MW 12x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.99 kg / 2.17 pounds
986.0 g / 9.7 N
1 mm Stal (~0.2) 0.69 kg / 1.52 pounds
688.0 g / 6.7 N
2 mm Stal (~0.2) 0.45 kg / 1.00 pounds
452.0 g / 4.4 N
3 mm Stal (~0.2) 0.29 kg / 0.63 pounds
286.0 g / 2.8 N
5 mm Stal (~0.2) 0.11 kg / 0.24 pounds
110.0 g / 1.1 N
10 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section defines the estimated holding capacity necessary to initiate the downward movement of the magnet down along a upright steel plate (considering typical friction). This parameter varies with the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 12x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.48 kg / 3.26 pounds
1479.0 g / 14.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.99 kg / 2.17 pounds
986.0 g / 9.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.49 kg / 1.09 pounds
493.0 g / 4.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.47 kg / 5.43 pounds
2465.0 g / 24.2 N
When hanging a holder on a upright surface (e.g., a fridge), it will only hold just about 1/5 of its nominal power. Gravity and a low friction coefficient influence the fact that products slip faster than they pop off the substrate. Planning a wall mount? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will slip down under a much lighter cargo. Using a rubber pad can drastically improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 12x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.49 kg / 1.09 pounds
493.0 g / 4.8 N
1 mm
25%
 1.23 kg / 2.72 pounds
1232.5 g / 12.1 N
2 mm
50%
 2.47 kg / 5.43 pounds
2465.0 g / 24.2 N
3 mm
75%
 3.70 kg / 8.15 pounds
3697.5 g / 36.3 N
5 mm
100%
 4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
10 mm
100%
 4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
11 mm
100%
 4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
12 mm
100%
 4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
A too thin steel is unable to focus the entire magnetic field, which wastes potential of the holder. Should you install a neodymium to a too thin substrate, the magnetism will pass right through and the attraction force will be weaker. To squeeze 100% of this neodymium's power, you need a suitably thick backing of metal. The saturation effect means that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Thermal stability (stability) - power drop
MW 12x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.93 kg / 10.87 pounds
4930.0 g / 48.4 N
 OK
40 °C -2.2% 4.82 kg / 10.63 pounds
4821.5 g / 47.3 N
 OK
60 °C -4.4% 4.71 kg / 10.39 pounds
4713.1 g / 46.2 N
 OK
80 °C -6.6% 4.60 kg / 10.15 pounds
4604.6 g / 45.2 N
100 °C -28.8% 3.51 kg / 7.74 pounds
3510.2 g / 34.4 N
Classic neodymiums change their properties strength after exceeding the maximum temperature. Avoid high temperatures – high temperature can permanently demagnetize this product. With every degree above norm, the magnet's capacity momentarily decreases. Do not use this product close to heaters higher than its operating temperature limit. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently sooner than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 12x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.10 kg / 37.69 pounds
5 795 Gs
2.56 kg / 5.65 pounds
2565 g / 25.2 N
 N/A
1 mm 14.44 kg / 31.83 pounds
9 101 Gs
2.17 kg / 4.77 pounds
2166 g / 21.2 N
 12.99 kg / 28.64 pounds
~0 Gs
2 mm 11.95 kg / 26.34 pounds
8 279 Gs
1.79 kg / 3.95 pounds
1792 g / 17.6 N
 10.75 kg / 23.71 pounds
~0 Gs
3 mm 9.74 kg / 21.48 pounds
7 477 Gs
1.46 kg / 3.22 pounds
1462 g / 14.3 N
 8.77 kg / 19.33 pounds
~0 Gs
5 mm 6.27 kg / 13.82 pounds
5 997 Gs
0.94 kg / 2.07 pounds
940 g / 9.2 N
 5.64 kg / 12.44 pounds
~0 Gs
10 mm 1.92 kg / 4.24 pounds
3 320 Gs
0.29 kg / 0.64 pounds
288 g / 2.8 N
 1.73 kg / 3.81 pounds
~0 Gs
20 mm 0.22 kg / 0.49 pounds
1 131 Gs
0.03 kg / 0.07 pounds
33 g / 0.3 N
 0.20 kg / 0.44 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
142 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
89 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
59 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
41 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
30 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
23 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products interact from a much further distance than a neodymium and metal setup. Such a system of two magnets generates a stronger field and a wider radius of operation. Planning to create a powerful holder? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is huge. The repulsion force is a bit weaker than the attraction, but still significant.
*Flux density in repulsion mode is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Note: Estimates apply to friction force of dual same magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (electronics) - warnings
MW 12x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 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 magnets produce a field that destroys function of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and housings. Exceptional care must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - warning
MW 12x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.40 km/h
(7.61 m/s)
 0.20 J
30 mm 47.07 km/h
(13.08 m/s)
 0.58 J
50 mm 60.77 km/h
(16.88 m/s)
 0.97 J
100 mm 85.94 km/h
(23.87 m/s)
 1.93 J
Magnetic elements are very brittle – a collision with steel causes immediate chipping. Pay attention to connection velocity – a magnet released freely becomes dangerous. Impact energy can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed means shattering of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Anti-corrosion coating durability
MW 12x8 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Pc)
MW 12x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 650 Mx 56.5 µWb
Pc Coefficient 0.71 High (Stable)
Flux value emitted by the magnet pole. Essential parameter when building generators and motors. Pc value defines the working geometry.

Table 11: Submerged application
MW 12x8 / N38

Environment Effective steel pull Effect
Air (land) 4.93 kg Standard
Water (riverbed) 5.64 kg
(+0.71 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.
1. Shear force

*Warning: On a vertical wall, the magnet holds merely ~20% of its nominal pull.

2. Steel saturation

*Thin steel (e.g. computer case) severely reduces the holding force.

3. Heat tolerance

*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) = 0.71

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.

Engineering data and GPSR
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: 010022-2026
Quick Unit Converter
Pulling force
Magnetic Induction
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The presented product is an extremely powerful rod magnet, composed of durable NdFeB material, which, at dimensions of Ø12x8 mm, guarantees optimal power. This specific item is characterized by 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 significant force (approx. 4.93 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, 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 perfect 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 48.32 N with a weight of only 6.79 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 12.1 mm) using two-component epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need the strongest magnets in the same volume (Ø12x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 12 mm and height 8 mm. The value of 48.32 N means that the magnet is capable of holding a weight many times exceeding its own mass of 6.79 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 8 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 and disadvantages of rare earth magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • Their power is durable, and after approximately ten years it drops only by ~1% (according to research),
  • Magnets perfectly protect themselves against loss of magnetization caused by foreign field sources,
  • A magnet with a shiny gold surface is more attractive,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of detailed forming and optimizing to specific needs,
  • Universal use in electronics industry – they are utilized in computer drives, electromotive mechanisms, diagnostic systems, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in compact constructions

Cons

What to avoid - cons of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing threads and complex shapes in magnets, we propose using a housing - magnetic holder.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these products are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

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

Holding force of 4.93 kg is a result of laboratory testing performed under the following configuration:
  • using a sheet made of low-carbon steel, serving as a magnetic yoke
  • with a thickness no less than 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (surface-to-surface)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

In real-world applications, the actual holding force is determined by a number of factors, ranked from most significant:
  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin sheet does not close the flux, causing part of the flux to be wasted into the air.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic permeability and lifting capacity.
  • Surface structure – the more even the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (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 75%. Additionally, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

H&S for magnets
Warning for allergy sufferers

Certain individuals suffer from a hypersensitivity to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact might lead to a rash. We suggest use safety gloves.

Protective goggles

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Fire warning

Dust created during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Protect data

Data protection: Strong magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Do not give to children

These products are not intended for children. Swallowing a few magnets may result in them pinching intestinal walls, which constitutes a critical condition and requires urgent medical intervention.

Crushing force

Risk of injury: The pulling power is so immense that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Danger to pacemakers

Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Heat sensitivity

Regular neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. This process is irreversible.

Handling rules

Exercise caution. Neodymium magnets act from a long distance and snap with massive power, often quicker than you can react.

Magnetic interference

An intense magnetic field disrupts the functioning of magnetometers in smartphones and navigation systems. Maintain magnets close to a device to prevent damaging the sensors.

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