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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

Technical modeling of the assembly - technical parameters

Presented information constitute the result of a engineering analysis. Results rely on algorithms for the class Nd2Fe14B. Operational parameters may differ. Treat these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - power drop
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
medium risk
1 mm 3438 Gs
343.8 mT
3.45 kg / 7.61 LBS
3451.9 g / 33.9 N
medium risk
2 mm 2824 Gs
282.4 mT
2.33 kg / 5.14 LBS
2329.8 g / 22.9 N
medium risk
3 mm 2255 Gs
225.5 mT
1.48 kg / 3.27 LBS
1484.8 g / 14.6 N
low risk
5 mm 1386 Gs
138.6 mT
0.56 kg / 1.24 LBS
561.3 g / 5.5 N
low risk
10 mm 445 Gs
44.5 mT
0.06 kg / 0.13 LBS
58.0 g / 0.6 N
low risk
15 mm 181 Gs
18.1 mT
0.01 kg / 0.02 LBS
9.6 g / 0.1 N
low risk
20 mm 89 Gs
8.9 mT
0.00 kg / 0.01 LBS
2.3 g / 0.0 N
low risk
30 mm 30 Gs
3.0 mT
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
low risk
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk

Table 2: Vertical force (vertical surface)
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: Vertical assembly (shearing) - vertical pull
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) - sheet metal selection
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: Thermal stability (material behavior) - 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 (repulsion) - 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: Hazards (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
Mobile device 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: Dynamics (cracking risk) - 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: Coating parameters (durability)
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: Electrical data (Pc)
MW 12x4 / N52

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

Table 11: Hydrostatics and buoyancy
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Warning: On a vertical surface, the magnet holds only ~20% of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (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) = 0.44

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
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%
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: 010500-2026
Measurement Calculator
Force (pull)

Magnetic Induction

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This product is a very strong cylindrical magnet, manufactured from advanced NdFeB material, which, with dimensions of Ø12x4 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 4.68 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 45.89 N with a weight of only 3.39 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
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 epoxy glues. To ensure long-term durability in industry, 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 frequently chosen 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 (Ø12x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø12x4 mm, which, at a weight of 3.39 g, makes it an element with impressive magnetic energy density. 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 secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 4 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.

Pros and cons of Nd2Fe14B magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even over around 10 years – the drop in power is only ~1% (based on measurements),
  • They have excellent resistance to magnetism drop when exposed to external fields,
  • Thanks to the metallic finish, the surface of nickel, gold, or silver gives an elegant appearance,
  • The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to freedom in constructing and the ability to adapt to complex applications,
  • Wide application in innovative solutions – they are used in magnetic memories, drive modules, medical equipment, as well as multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Weaknesses

Problematic aspects of neodymium magnets: tips and applications.
  • Brittleness 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
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of producing nuts in the magnet and complicated shapes - preferred is a housing - mounting mechanism.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products can be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Detachment force of the magnet in optimal conditionswhat it depends on?

Information about lifting capacity was determined for ideal contact conditions, taking into account:
  • on a plate made of structural steel, optimally conducting the magnetic flux
  • whose thickness reaches at least 10 mm
  • with an polished contact surface
  • without any clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Lifting capacity in practice – influencing factors

It is worth knowing that the application force may be lower subject to elements below, in order of importance:
  • Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with neodymium magnets
No play value

Always keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are life-threatening.

Combustion hazard

Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Crushing force

Large magnets can smash fingers instantly. Under no circumstances place your hand between two attracting surfaces.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation appears, immediately stop handling magnets and use protective gear.

Handling guide

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

Warning for heart patients

Individuals with a pacemaker should maintain an absolute distance from magnets. The magnetism can disrupt the functioning of the life-saving device.

Magnetic interference

Note: neodymium magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, device, and navigation systems.

Thermal limits

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Magnet fragility

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Threat to electronics

Avoid bringing magnets close to a purse, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.

Important! Details 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