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MW 12x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010022

GTIN/EAN: 5906301810216

5.00
Load capacity 4.93 kg / 48.32 N Magnetic Induction 495.50 mT / 4955 Gs
Diameter Ø
12 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
6.79 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel
check specifications »

2.47 zł with VAT / pcs + price for transport

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical data of the product - 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 simulation of the magnet - report

Presented information constitute the result of a mathematical calculation. Results were calculated on models for the class Nd2Fe14B. Real-world parameters may deviate from the simulation results. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
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 lbs
4930.0 g / 48.4 N
 medium risk
1 mm 4139 Gs
413.9 mT
 3.44 kg / 7.59 lbs
3445.0 g / 33.8 N
 medium risk
2 mm 3356 Gs
335.6 mT
 2.26 kg / 4.99 lbs
2264.2 g / 22.2 N
 medium risk
3 mm 2670 Gs
267.0 mT
 1.43 kg / 3.16 lbs
1433.5 g / 14.1 N
 safe
5 mm 1660 Gs
166.0 mT
 0.55 kg / 1.22 lbs
554.1 g / 5.4 N
 safe
10 mm 565 Gs
56.5 mT
 0.06 kg / 0.14 lbs
64.3 g / 0.6 N
 safe
15 mm 243 Gs
24.3 mT
 0.01 kg / 0.03 lbs
11.8 g / 0.1 N
 safe
20 mm 124 Gs
12.4 mT
 0.00 kg / 0.01 lbs
3.1 g / 0.0 N
 safe
30 mm 45 Gs
4.5 mT
 0.00 kg / 0.00 lbs
0.4 g / 0.0 N
 safe
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 safe
Grip strength weakens drastically per each millimeter of gap. Remember that even a microscopic distance (e.g., contamination, paint, veneer) noticeably diminishes the holding power. Magnetic products hold most effectively during direct contact; air break drastically cuts the power. Analyze how quickly the parameters fall, when the product does not touch tightly to the steel surface. When planning the mounting, discard unnecessary gaps.

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 lbs
986.0 g / 9.7 N
1 mm Stal (~0.2) 0.69 kg / 1.52 lbs
688.0 g / 6.7 N
2 mm Stal (~0.2) 0.45 kg / 1.00 lbs
452.0 g / 4.4 N
3 mm Stal (~0.2) 0.29 kg / 0.63 lbs
286.0 g / 2.8 N
5 mm Stal (~0.2) 0.11 kg / 0.24 lbs
110.0 g / 1.1 N
10 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 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 following data indicates the theoretical force sufficient to start the sliding of the magnet vertically along a vertical steel plate (assuming typical friction coefficient). This value depends on the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
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 lbs
1479.0 g / 14.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.99 kg / 2.17 lbs
986.0 g / 9.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.49 kg / 1.09 lbs
493.0 g / 4.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.47 kg / 5.43 lbs
2465.0 g / 24.2 N
When hanging a magnet on a vertical surface (e.g., a fridge), it will maintain just approx. 1/5 of its maximum pull force. Gravity and a low friction coefficient cause that magnets slide down faster 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 slippery surface, the holder will slide down under a significantly smaller load. Application of an anti-slip layer can significantly improve the result.

Table 4: Steel thickness (saturation) - 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 lbs
493.0 g / 4.8 N
1 mm
25%
 1.23 kg / 2.72 lbs
1232.5 g / 12.1 N
2 mm
50%
 2.47 kg / 5.43 lbs
2465.0 g / 24.2 N
3 mm
75%
 3.70 kg / 8.15 lbs
3697.5 g / 36.3 N
5 mm
100%
 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
10 mm
100%
 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
11 mm
100%
 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
12 mm
100%
 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
A thin metal plate is incapable of take in the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a thin surface, the field will penetrate right through and the holding will be smaller. To squeeze 100% of this magnet's power, you need a suitably thick backing of steel. The saturation effect means that on delicate walls (e.g., appliance housings), the product works worse. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (stability) - thermal limit
MW 12x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
 OK
40 °C -2.2% 4.82 kg / 10.63 lbs
4821.5 g / 47.3 N
 OK
60 °C -4.4% 4.71 kg / 10.39 lbs
4713.1 g / 46.2 N
 OK
80 °C -6.6% 4.60 kg / 10.15 lbs
4604.6 g / 45.2 N
100 °C -28.8% 3.51 kg / 7.74 lbs
3510.2 g / 34.4 N
Standard neodymium magnets change their properties strength above the temperature limit. Protect against heat – heat can irreversibly damage this magnet. As the temperature rises, the magnet's force briefly drops. Refrain from using this product close to heaters higher than its safe range. Exceeding the critical threshold will lead to permanent loss of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low Pc) are more susceptible to demagnetization sooner than long magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 12x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.10 kg / 37.69 lbs
5 795 Gs
2.56 kg / 5.65 lbs
2565 g / 25.2 N
 N/A
1 mm 14.44 kg / 31.83 lbs
9 101 Gs
2.17 kg / 4.77 lbs
2166 g / 21.2 N
 12.99 kg / 28.64 lbs
~0 Gs
2 mm 11.95 kg / 26.34 lbs
8 279 Gs
1.79 kg / 3.95 lbs
1792 g / 17.6 N
 10.75 kg / 23.71 lbs
~0 Gs
3 mm 9.74 kg / 21.48 lbs
7 477 Gs
1.46 kg / 3.22 lbs
1462 g / 14.3 N
 8.77 kg / 19.33 lbs
~0 Gs
5 mm 6.27 kg / 13.82 lbs
5 997 Gs
0.94 kg / 2.07 lbs
940 g / 9.2 N
 5.64 kg / 12.44 lbs
~0 Gs
10 mm 1.92 kg / 4.24 lbs
3 320 Gs
0.29 kg / 0.64 lbs
288 g / 2.8 N
 1.73 kg / 3.81 lbs
~0 Gs
20 mm 0.22 kg / 0.49 lbs
1 131 Gs
0.03 kg / 0.07 lbs
33 g / 0.3 N
 0.20 kg / 0.44 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
142 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
89 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
59 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
41 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
30 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
23 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets attract each other from a wider radius than a magnet and sheet combination. Such a system of two magnets creates a more powerful interaction and a larger range of performance. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The levitation is marginally weaker than the attraction, but still significant.
*Flux density between like poles is approximately ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Attention: Calculations refer to shear force of dual same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - 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
Phone / Smartphone 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 poses a serious hazard to electronics and medical implants. These NdFeB products produce a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field acts through matter and housings. Special caution must be taken by people with cochlear implants and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - warning
MW 12x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.99 km/h
(5.83 m/s)
 0.12 J
30 mm 21.17 km/h
(5.88 m/s)
 0.12 J
50 mm 21.17 km/h
(5.88 m/s)
 0.12 J
100 mm 21.17 km/h
(5.88 m/s)
 0.12 J
NdFeB products are very brittle – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or injury to skin. Be sure to control the product during mounting so it doesn't hit violently against the steel surface. 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: Surface protection spec
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)
The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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)
Total magnetic flux passing through the magnet pole. Essential parameter when building generators and motors. Pc value determines the magnet's operating point.

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.
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 surface, the magnet retains only ~20% of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*For standard magnets, the max working temp 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.

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%

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: 010022-2026
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MW 2x4 / N38 - cylindrical magnet

0.209 zł brutto / pcs
The presented product is an exceptionally strong cylinder magnet, manufactured from durable NdFeB material, which, at dimensions of Ø12x8 mm, guarantees the highest energy density. The MW 12x8 / N38 component is characterized by high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 4.93 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. 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 low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are strong enough 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 (Ø12x8), 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 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 secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 8 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 through the diameter if your project requires it.

Strengths and weaknesses of Nd2Fe14B magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for nearly 10 years – the drop is just ~1% (based on simulations),
  • Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
  • A magnet with a shiny silver surface has an effective appearance,
  • Magnetic induction on the working part of the magnet turns out to be maximum,
  • 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 designing and the capacity to adapt to individual projects,
  • Universal use in high-tech industry – they are utilized in HDD drives, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Cons

What to avoid - cons of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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
  • They rust in a humid environment. For use outdoors we suggest 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 are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small components of these devices are able to complicate diagnosis medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Lifting parameters

Maximum magnetic pulling force – what it depends on?

Breakaway force was defined for optimal configuration, assuming:
  • using a sheet made of low-carbon steel, serving as a magnetic yoke
  • whose thickness equals approx. 10 mm
  • with a surface perfectly flat
  • without the slightest insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature room level

Practical lifting capacity: influencing factors

Effective lifting capacity is affected by working environment parameters, mainly (from priority):
  • Gap (betwixt the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be escaped to the other side.
  • Material type – the best choice is pure iron steel. Hardened steels may generate lower lifting capacity.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Safe handling of NdFeB magnets
Skin irritation risks

Certain individuals suffer from a contact allergy to nickel, which is the common plating for neodymium magnets. Extended handling may cause a rash. We strongly advise use safety gloves.

Demagnetization risk

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

Respect the power

Handle magnets consciously. Their immense force can surprise even professionals. Be vigilant and do not underestimate their force.

Machining danger

Powder generated during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Danger to pacemakers

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

No play value

Absolutely keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are very dangerous.

Fragile material

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Magnetic interference

A powerful magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Keep magnets near a smartphone to avoid breaking the sensors.

Protect data

Very strong magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Crushing force

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

Important! More info about hazards in the article: Safety of working with magnets.