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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

2.47 with VAT / pcs + price for transport

2.01 ZŁ net + 23% VAT / pcs

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Technical data - 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

Technical simulation of the assembly - data

These data constitute the direct effect of a engineering analysis. Results were calculated on algorithms for the material Nd2Fe14B. Operational performance may differ from theoretical values. Use these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (force vs gap) - 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 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
safe
5 mm 1660 Gs
166.0 mT
0.55 kg / 1.22 pounds
554.1 g / 5.4 N
safe
10 mm 565 Gs
56.5 mT
0.06 kg / 0.14 pounds
64.3 g / 0.6 N
safe
15 mm 243 Gs
24.3 mT
0.01 kg / 0.03 pounds
11.8 g / 0.1 N
safe
20 mm 124 Gs
12.4 mT
0.00 kg / 0.01 pounds
3.1 g / 0.0 N
safe
30 mm 45 Gs
4.5 mT
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
safe
50 mm 11 Gs
1.1 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Vertical 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

Table 3: Vertical assembly (sliding) - 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

Table 4: Material efficiency (substrate influence) - power losses
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

Table 5: Thermal stability (material behavior) - 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

Table 6: Two magnets (repulsion) - field collision
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 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

Table 7: Safety (HSE) (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
Timepiece 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Remote 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

Table 8: Impact energy (cracking risk) - collision effects
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

Table 9: Corrosion resistance
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)

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)

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.
1. Vertical hold

*Caution: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Plate thickness effect

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

3. Thermal stability

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.71

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.

Engineering data and GPSR
Chemical composition
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
Magnet Unit Converter
Pulling force

Magnetic Induction

Other offers

The offered product is a very strong cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø12x8 mm, guarantees optimal power. This specific item boasts an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding 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 lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced sensors, and efficient filters, where maximum induction 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 tolerance of ±0.1mm, 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 long-term durability in automation, 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 popular standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. 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 in continuous sale 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.
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. 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 diametrically if your project requires it.

Pros as well as cons of neodymium magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They do not lose power, even after approximately ten years – the reduction in strength is only ~1% (theoretically),
  • They have excellent resistance to weakening of magnetic properties due to external fields,
  • In other words, due to the aesthetic finish of nickel, the element gains visual value,
  • The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to freedom in forming and the capacity to adapt to client solutions,
  • Fundamental importance in modern industrial fields – they are commonly used in hard drives, electromotive mechanisms, medical devices, as well as complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets: tips and applications.
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited possibility of making threads in the magnet and complicated shapes - recommended is casing - magnet mounting.
  • Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these devices are able to be problematic in diagnostics medical after entering the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Best holding force of the magnet in ideal parameterswhat it depends on?

Magnet power is the result of a measurement for ideal contact conditions, assuming:
  • using a sheet made of mild steel, functioning as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • with an polished touching surface
  • with direct contact (no paint)
  • during pulling in a direction vertical to the mounting surface
  • in temp. approx. 20°C

What influences lifting capacity in practice

It is worth knowing that the working load may be lower depending on the following factors, in order of importance:
  • Gap between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Steel thickness – insufficiently thick plate causes magnetic saturation, causing part of the flux to be lost to the other side.
  • Metal type – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Thermal factor – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

H&S for magnets
Compass and GPS

Note: rare earth magnets produce a field that interferes with precision electronics. Keep a separation from your mobile, tablet, and navigation systems.

Magnetic media

Powerful magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Safe operation

Be careful. Rare earth magnets act from a distance and connect with huge force, often faster than you can react.

Danger to pacemakers

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

Fragile material

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets will cause them shattering into shards.

Do not give to children

Neodymium magnets are not toys. Accidental ingestion of multiple magnets may result in them connecting inside the digestive tract, which poses a severe health hazard and requires immediate surgery.

Mechanical processing

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Demagnetization risk

Avoid heat. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Pinching danger

Big blocks can smash fingers in a fraction of a second. Never put your hand betwixt two strong magnets.

Skin irritation risks

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, avoid direct skin contact or choose coated magnets.

Danger! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98