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MW 12x4 / N52 - cylindrical magnet

cylindrical magnet

Catalog no 010500

GTIN/EAN: 5906301814962

5.00

Diameter Ø

12 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

3.39 g

Magnetization Direction

↑ axial

Load capacity

4.68 kg / 45.89 N

Magnetic Induction

400.45 mT / 4005 Gs

Coating

[NiCuNi] Nickel

2.18 with VAT / pcs + price for transport

1.770 ZŁ net + 23% VAT / pcs

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Physical properties - MW 12x4 / N52 - cylindrical magnet

Specification / characteristics - MW 12x4 / N52 - cylindrical magnet

properties
properties values
Cat. no. 010500
GTIN/EAN 5906301814962
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 4 mm [±0,1 mm]
Weight 3.39 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.68 kg / 45.89 N
Magnetic Induction ~ ? 400.45 mT / 4005 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N52

Specification / characteristics MW 12x4 / N52 - cylindrical magnet
properties values units
remenance Br [min. - max.] ? 14.2-14.7 kGs
remenance Br [min. - max.] ? 1420-1470 mT
coercivity bHc ? 10.8-12.5 kOe
coercivity bHc ? 860-995 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [min. - max.] ? 48-53 BH max MGOe
energy density [min. - max.] ? 380-422 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 analysis of the product - data

These data constitute the direct effect of a engineering simulation. Values were calculated on models for the class Nd2Fe14B. Actual parameters might slightly differ. Please consider these calculations as a supplementary guide for designers.

Table 1: Static force (force vs distance) - interaction chart
MW 12x4 / N52

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4003 Gs
400.3 mT
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
warning
1 mm 3438 Gs
343.8 mT
3.45 kg / 7.61 LBS
3451.9 g / 33.9 N
warning
2 mm 2824 Gs
282.4 mT
2.33 kg / 5.14 LBS
2329.8 g / 22.9 N
warning
3 mm 2255 Gs
225.5 mT
1.48 kg / 3.27 LBS
1484.8 g / 14.6 N
weak grip
5 mm 1386 Gs
138.6 mT
0.56 kg / 1.24 LBS
561.3 g / 5.5 N
weak grip
10 mm 445 Gs
44.5 mT
0.06 kg / 0.13 LBS
58.0 g / 0.6 N
weak grip
15 mm 181 Gs
18.1 mT
0.01 kg / 0.02 LBS
9.6 g / 0.1 N
weak grip
20 mm 89 Gs
8.9 mT
0.00 kg / 0.01 LBS
2.3 g / 0.0 N
weak grip
30 mm 30 Gs
3.0 mT
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
weak grip
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip

Table 2: Vertical force (wall)
MW 12x4 / N52

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.94 kg / 2.06 LBS
936.0 g / 9.2 N
1 mm Stal (~0.2) 0.69 kg / 1.52 LBS
690.0 g / 6.8 N
2 mm Stal (~0.2) 0.47 kg / 1.03 LBS
466.0 g / 4.6 N
3 mm Stal (~0.2) 0.30 kg / 0.65 LBS
296.0 g / 2.9 N
5 mm Stal (~0.2) 0.11 kg / 0.25 LBS
112.0 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

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 12x4 / N52

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.40 kg / 3.10 LBS
1404.0 g / 13.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.94 kg / 2.06 LBS
936.0 g / 9.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.47 kg / 1.03 LBS
468.0 g / 4.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.34 kg / 5.16 LBS
2340.0 g / 23.0 N

Table 4: Material efficiency (substrate influence) - power losses
MW 12x4 / N52

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.47 kg / 1.03 LBS
468.0 g / 4.6 N
1 mm
25%
1.17 kg / 2.58 LBS
1170.0 g / 11.5 N
2 mm
50%
2.34 kg / 5.16 LBS
2340.0 g / 23.0 N
3 mm
75%
3.51 kg / 7.74 LBS
3510.0 g / 34.4 N
5 mm
100%
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
10 mm
100%
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
11 mm
100%
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
12 mm
100%
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N

Table 5: Working in heat (stability) - resistance threshold
MW 12x4 / N52

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
OK
40 °C -2.2% 4.58 kg / 10.09 LBS
4577.0 g / 44.9 N
OK
60 °C -4.4% 4.47 kg / 9.86 LBS
4474.1 g / 43.9 N
80 °C -6.6% 4.37 kg / 9.64 LBS
4371.1 g / 42.9 N
100 °C -28.8% 3.33 kg / 7.35 LBS
3332.2 g / 32.7 N

Table 6: Two magnets (attraction) - forces in the system
MW 12x4 / N52

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 11.17 kg / 24.63 LBS
5 771 Gs
1.68 kg / 3.69 LBS
1676 g / 16.4 N
N/A
1 mm 9.73 kg / 21.44 LBS
7 470 Gs
1.46 kg / 3.22 LBS
1459 g / 14.3 N
8.75 kg / 19.30 LBS
~0 Gs
2 mm 8.24 kg / 18.16 LBS
6 875 Gs
1.24 kg / 2.72 LBS
1236 g / 12.1 N
7.42 kg / 16.35 LBS
~0 Gs
3 mm 6.83 kg / 15.06 LBS
6 260 Gs
1.02 kg / 2.26 LBS
1024 g / 10.1 N
6.15 kg / 13.55 LBS
~0 Gs
5 mm 4.46 kg / 9.84 LBS
5 060 Gs
0.67 kg / 1.48 LBS
670 g / 6.6 N
4.02 kg / 8.86 LBS
~0 Gs
10 mm 1.34 kg / 2.95 LBS
2 772 Gs
0.20 kg / 0.44 LBS
201 g / 2.0 N
1.21 kg / 2.66 LBS
~0 Gs
20 mm 0.14 kg / 0.30 LBS
891 Gs
0.02 kg / 0.05 LBS
21 g / 0.2 N
0.12 kg / 0.27 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
99 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
61 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
40 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
27 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
20 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
15 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Safety (HSE) (implants) - warnings
MW 12x4 / N52

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Car key 50 Gs (5.0 mT) 2.5 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 (kinetic energy) - collision effects
MW 12x4 / N52

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 37.76 km/h
(10.49 m/s)
0.19 J
30 mm 64.91 km/h
(18.03 m/s)
0.55 J
50 mm 83.79 km/h
(23.27 m/s)
0.92 J
100 mm 118.50 km/h
(32.92 m/s)
1.84 J

Table 9: Corrosion resistance
MW 12x4 / N52

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: Construction data (Flux)
MW 12x4 / N52

Parameter Value SI Unit / Description
Magnetic Flux 4 794 Mx 47.9 µWb
Pc Coefficient 0.44 Low (Flat)

Table 11: Underwater work (magnet fishing)
MW 12x4 / N52

Environment Effective steel pull Effect
Air (land) 4.68 kg Standard
Water (riverbed) 5.36 kg
(+0.68 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Caution: On a vertical surface, the magnet retains only ~20% of its nominal pull.

2. Steel thickness impact

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

3. Temperature resistance

*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) = 0.44

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 and environmental data
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: 010500-2026
Measurement Calculator
Pulling force

Magnetic Field

Other proposals

This product is a very strong cylindrical magnet, manufactured from modern NdFeB material, which, at dimensions of Ø12x4 mm, guarantees optimal power. This specific item features a tolerance of ±0.1mm and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 4.68 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical 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 45.89 N with a weight of only 3.39 g, this rod 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 epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% 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 (Ø12x4), 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 4 mm. The value of 45.89 N means that the magnet is capable of holding a weight many times exceeding its own mass of 3.39 g. 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. 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.

Strengths and weaknesses of rare earth magnets.

Advantages

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • Neodymium magnets remain exceptionally resistant to demagnetization caused by external magnetic fields,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of precise shaping as well as optimizing to precise requirements,
  • Wide application in future technologies – they are commonly used in HDD drives, motor assemblies, medical devices, as well as technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Weaknesses

What to avoid - cons of neodymium magnets and ways of using them
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • We recommend a housing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated shapes.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, small components of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat affects it?

The declared magnet strength concerns the peak performance, recorded under optimal environment, meaning:
  • on a block made of mild steel, effectively closing the magnetic field
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with a surface cleaned and smooth
  • with direct contact (without coatings)
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Practical aspects of lifting capacity – factors

In real-world applications, the real power results from several key aspects, presented from the most important:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets
This is not a toy

Neodymium magnets are not toys. Swallowing a few magnets can lead to them attracting across intestines, which poses a severe health hazard and necessitates urgent medical intervention.

Dust is flammable

Dust generated during cutting of magnets is flammable. Do not drill into magnets unless you are an expert.

Powerful field

Be careful. Neodymium magnets act from a long distance and connect with huge force, often quicker than you can move away.

Keep away from electronics

Remember: rare earth magnets generate a field that interferes with precision electronics. Keep a safe distance from your mobile, tablet, and navigation systems.

Life threat

For implant holders: Powerful magnets affect medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Finger safety

Watch your fingers. Two large magnets will join instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Thermal limits

Do not overheat. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Keep away from computers

Do not bring magnets close to a wallet, laptop, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.

Eye protection

Watch out for shards. Magnets can explode upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Nickel allergy

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness occurs, cease working with magnets and use protective gear.

Warning! More info about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98