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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

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2.18 ZŁ 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 analysis of the magnet - report

The following data are the outcome of a mathematical simulation. Values were calculated on models for the material Nd2Fe14B. Real-world conditions might slightly differ. Treat these calculations as a supplementary guide during assembly planning.

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
 strong
1 mm 3438 Gs
343.8 mT
 3.45 kg / 7.61 lbs
3451.9 g / 33.9 N
 strong
2 mm 2824 Gs
282.4 mT
 2.33 kg / 5.14 lbs
2329.8 g / 22.9 N
 strong
3 mm 2255 Gs
225.5 mT
 1.48 kg / 3.27 lbs
1484.8 g / 14.6 N
 safe
5 mm 1386 Gs
138.6 mT
 0.56 kg / 1.24 lbs
561.3 g / 5.5 N
 safe
10 mm 445 Gs
44.5 mT
 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
 safe
15 mm 181 Gs
18.1 mT
 0.01 kg / 0.02 lbs
9.6 g / 0.1 N
 safe
20 mm 89 Gs
8.9 mT
 0.00 kg / 0.01 lbs
2.3 g / 0.0 N
 safe
30 mm 30 Gs
3.0 mT
 0.00 kg / 0.00 lbs
0.3 g / 0.0 N
 safe
50 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 safe
Grip strength weakens sharply with every mm of spacing. Remember that even the smallest gap (e.g., contamination, paint, rust) significantly diminishes the holding power. Magnets operate most effectively in perfect adhesion; distance drastically cuts the force. Notice how rapidly the pull force fall, when the magnet does not touch directly to the steel surface. When planning the mounting, discard unnecessary gaps.

Table 2: Vertical capacity (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
The following data defines the estimated holding capacity needed to initiate the shifting of the magnet downwards along a upright steel wall (considering typical friction). This parameter is a function of the distance between the magnet and the metal.

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
When hanging a holder on a vertical plane (e.g., a board), it will only hold barely about 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient mean that holders move down easier than they pop off the substrate. Planning a vertical fastening? Consider that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the element will slip down under a much lighter load. Using a rubber coating can effectively improve the result.

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
A thin sheet is incapable of focus the entire magnetic field, which wastes potential of the magnet. Should you mount a strong magnet to a thin surface, the field will pass right through and the holding will be smaller. To squeeze the maximum of this magnet's power, you need a suitably thick element of steel. The saturation phenomenon causes that on sheet metal structures (e.g., car bodies), the product works worse. We advise picking the steel cross-section based on the following data.

Table 5: Working in heat (material behavior) - power drop
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
Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Watch out for overheating – heat can permanently damage this product. With every degree above norm, the neodymium's power briefly decreases. Refrain from using this magnet close to ovens exceeding its safe range. Ignoring the limit will result in irreversible degradation of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 12x4 / N52

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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
Two magnets attract each other from a wider radius than a magnet and steel combination. Such a system of two magnets creates a more powerful interaction and a further horizon of performance. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a steel. Be careful that when connecting a pair of magnets, the pinch force is huge. The levitation is a bit weaker than the attraction, but still impressive.
*The magnetic induction for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
Important: Calculations refer to shear force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - precautionary measures
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
Powerful magnet radiation poses a serious hazard to electronics and pacemakers. These neodymiums produce a flux that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation passes through tissues and plastic. Special caution must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
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
NdFeB products are very brittle – a strong collision with metal can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can destroy the magnet or dangerous crushing to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when handling with large magnets.

Table 9: Surface protection spec
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MW 12x4 / N52

Parameter Value SI Unit / Description
Magnetic Flux 4 794 Mx 47.9 µWb
Pc Coefficient 0.44 Low (Flat)
Flux value passing through the magnet pole. Essential parameter when building generators as well as sensors. Pc value determines the working geometry.

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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains merely ~20% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.

3. Thermal stability

*For N38 grade, the critical 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 specification and ecology
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%
Environmental data
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
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This product is a very strong cylindrical magnet, made from modern NdFeB material, which, at dimensions of Ø12x4 mm, guarantees maximum efficiency. The MW 12x4 / N52 component boasts an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 4.68 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in standard 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 fastening or actuating element. Thanks to the pull force of 45.89 N with a weight of only 3.39 g, this rod is indispensable in miniature devices and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance 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 high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 4.68 kg (force ~45.89 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 4 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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 diametrically if your project requires it.

Pros as well as cons of neodymium magnets.

Advantages

Apart from their consistent power, neodymium magnets have these key benefits:
  • They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
  • They have excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • A magnet with a smooth silver surface has better aesthetics,
  • Magnetic induction on the working part of the magnet is maximum,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Due to the potential of precise forming and adaptation to specialized projects, NdFeB magnets can be manufactured in a variety of forms and dimensions, which amplifies use scope,
  • Significant place in innovative solutions – they find application in mass storage devices, brushless drives, diagnostic systems, as well as complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise 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 suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • We recommend casing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Highest magnetic holding force – what it depends on?

Information about lifting capacity was determined for ideal contact conditions, assuming:
  • on a base made of structural steel, perfectly concentrating the magnetic flux
  • with a thickness no less than 10 mm
  • characterized by lack of roughness
  • with total lack of distance (no impurities)
  • during detachment in a direction perpendicular to the mounting surface
  • at temperature room level

Determinants of practical lifting force of a magnet

Bear in mind that the application force may be lower influenced by the following factors, in order of importance:
  • Air gap (betwixt the magnet and the metal), as even a very small distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Direction of force – highest force is reached only during perpendicular pulling. The shear force of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin steel does not accept the full field, causing part of the power to be wasted into the air.
  • Metal type – not every steel attracts identically. Alloy additives weaken the attraction effect.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate reduces the holding force.

H&S for magnets
Eye protection

Beware of splinters. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.

Safe operation

Use magnets with awareness. Their huge power can shock even experienced users. Stay alert and respect their force.

Avoid contact if allergic

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness appears, cease handling magnets and use protective gear.

Electronic devices

Data protection: Strong magnets can damage data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Flammability

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Thermal limits

Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.

Crushing risk

Danger of trauma: The attraction force is so immense that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

Threat to navigation

Note: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a separation from your mobile, tablet, and navigation systems.

Health Danger

For implant holders: Strong magnetic fields disrupt medical devices. Keep at least 30 cm distance or request help to handle the magnets.

This is not a toy

Product intended for adults. Small elements pose a choking risk, causing serious injuries. Store out of reach of children and animals.

Warning! More info about hazards in the article: Magnet Safety Guide.