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MW 12x6 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010021

GTIN/EAN: 5906301810209

5.00

Diameter Ø

12 mm [±0,1 mm]

Height

6 mm [±0,1 mm]

Weight

5.09 g

Magnetization Direction

↑ axial

Load capacity

4.60 kg / 45.09 N

Magnetic Induction

437.99 mT / 4380 Gs

Coating

[NiCuNi] Nickel

check technical specifications »

1.882 ZŁ with VAT / pcs + price for transport

1.530 ZŁ net + 23% VAT / pcs

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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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Detailed specification - MW 12x6 / N38 - cylindrical magnet

Specification / characteristics - MW 12x6 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010021
GTIN/EAN 5906301810209
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 6 mm [±0,1 mm]
Weight 5.09 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.60 kg / 45.09 N
Magnetic Induction ~ ? 437.99 mT / 4380 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12x6 / 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

Engineering simulation of the assembly - technical parameters

The following information represent the direct effect of a physical simulation. Values rely on algorithms for the class Nd2Fe14B. Actual performance may differ. Use these calculations as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MW 12x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4377 Gs
437.7 mT
 4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
 warning
1 mm 3688 Gs
368.8 mT
 3.27 kg / 7.20 lbs
3265.4 g / 32.0 N
 warning
2 mm 2999 Gs
299.9 mT
 2.16 kg / 4.76 lbs
2159.7 g / 21.2 N
 warning
3 mm 2386 Gs
238.6 mT
 1.37 kg / 3.01 lbs
1366.7 g / 13.4 N
 weak grip
5 mm 1474 Gs
147.4 mT
 0.52 kg / 1.15 lbs
521.4 g / 5.1 N
 weak grip
10 mm 489 Gs
48.9 mT
 0.06 kg / 0.13 lbs
57.4 g / 0.6 N
 weak grip
15 mm 205 Gs
20.5 mT
 0.01 kg / 0.02 lbs
10.1 g / 0.1 N
 weak grip
20 mm 103 Gs
10.3 mT
 0.00 kg / 0.01 lbs
2.5 g / 0.0 N
 weak grip
30 mm 36 Gs
3.6 mT
 0.00 kg / 0.00 lbs
0.3 g / 0.0 N
 weak grip
50 mm 9 Gs
0.9 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Pulling power weakens drastically per each millimeter of spacing. Remember that even a very thin break (e.g., dirt, varnish, veneer) significantly weakens the grip. Magnets operate strongest in perfect adhesion; distance kills the power. See how flashily the parameters fall, when the product does not touch flatly to the steel surface. When designing the assembly, eliminate unnecessary gaps.

Table 2: Slippage capacity (wall)
MW 12x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.92 kg / 2.03 lbs
920.0 g / 9.0 N
1 mm Stal (~0.2) 0.65 kg / 1.44 lbs
654.0 g / 6.4 N
2 mm Stal (~0.2) 0.43 kg / 0.95 lbs
432.0 g / 4.2 N
3 mm Stal (~0.2) 0.27 kg / 0.60 lbs
274.0 g / 2.7 N
5 mm Stal (~0.2) 0.10 kg / 0.23 lbs
104.0 g / 1.0 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 table below indicates the estimated force required to initiate the shifting of the magnet down against a upright metal surface (assuming standard friction). This value varies with the distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 12x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.38 kg / 3.04 lbs
1380.0 g / 13.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.92 kg / 2.03 lbs
920.0 g / 9.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.46 kg / 1.01 lbs
460.0 g / 4.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.30 kg / 5.07 lbs
2300.0 g / 22.6 N
When hanging a magnet on a upright wall (e.g., a board), it will only hold only approx. 1/5 of its nominal power. Gravitational force as well as a low friction coefficient cause that magnets slide down faster than they pull off. Want to create a vertical fastening? Note that the shear force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a significantly smaller weight. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 12x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.46 kg / 1.01 lbs
460.0 g / 4.5 N
1 mm
25%
 1.15 kg / 2.54 lbs
1150.0 g / 11.3 N
2 mm
50%
 2.30 kg / 5.07 lbs
2300.0 g / 22.6 N
3 mm
75%
 3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
5 mm
100%
 4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
10 mm
100%
 4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
11 mm
100%
 4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
12 mm
100%
 4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
A too thin steel is not enough to focus the full magnetic flux, which squanders power of the holder. Should you install a neodymium to a too thin substrate, the magnetism will pass right through and the holding will be smaller. To utilize the maximum of this magnet's power, you need a suitably thick backing of metal. The material oversaturation causes that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We advise picking the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - resistance threshold
MW 12x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
 OK
40 °C -2.2% 4.50 kg / 9.92 lbs
4498.8 g / 44.1 N
 OK
60 °C -4.4% 4.40 kg / 9.70 lbs
4397.6 g / 43.1 N
80 °C -6.6% 4.30 kg / 9.47 lbs
4296.4 g / 42.1 N
100 °C -28.8% 3.28 kg / 7.22 lbs
3275.2 g / 32.1 N
Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Avoid high temperatures – heat can permanently demagnetize this magnet. As the temperature rises, the magnet's power briefly lowers. Refrain from using this product close to ovens higher than its operating temperature limit. Ignoring the limit will lead to permanent loss of magnetism.
*Engineering note: Temperature resistance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than taller cylinders. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MW 12x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.36 kg / 29.45 lbs
5 536 Gs
2.00 kg / 4.42 lbs
2004 g / 19.7 N
 N/A
1 mm 11.39 kg / 25.10 lbs
8 082 Gs
1.71 kg / 3.77 lbs
1708 g / 16.8 N
 10.25 kg / 22.59 lbs
~0 Gs
2 mm 9.48 kg / 20.91 lbs
7 376 Gs
1.42 kg / 3.14 lbs
1423 g / 14.0 N
 8.54 kg / 18.82 lbs
~0 Gs
3 mm 7.77 kg / 17.12 lbs
6 675 Gs
1.17 kg / 2.57 lbs
1165 g / 11.4 N
 6.99 kg / 15.41 lbs
~0 Gs
5 mm 5.01 kg / 11.05 lbs
5 361 Gs
0.75 kg / 1.66 lbs
752 g / 7.4 N
 4.51 kg / 9.94 lbs
~0 Gs
10 mm 1.51 kg / 3.34 lbs
2 948 Gs
0.23 kg / 0.50 lbs
227 g / 2.2 N
 1.36 kg / 3.01 lbs
~0 Gs
20 mm 0.17 kg / 0.37 lbs
978 Gs
0.02 kg / 0.06 lbs
25 g / 0.2 N
 0.15 kg / 0.33 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
116 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
72 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
48 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
33 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
24 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
18 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and sheet setup. The connection of magnet-to-magnet generates a stronger field and a further horizon of action. Planning to create a strong closure? Apply two magnets instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the impact force is huge. The levitation is marginally weaker than the attraction, but still impressive.
*The magnetic induction between like poles is approximately ~0 Gs at the midpoint between the magnets (due to field cancellation).
Attention: Figures show shear force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
MW 12x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.0 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
Powerful magnet radiation is a real danger to IT equipment as well as pacemakers. These magnets generate a flux that disrupts operation of digital equipment. Remember: the invisible magnetic field penetrates the body and housings. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MW 12x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 30.55 km/h
(8.49 m/s)
 0.18 J
30 mm 52.51 km/h
(14.59 m/s)
 0.54 J
50 mm 67.79 km/h
(18.83 m/s)
 0.90 J
100 mm 95.87 km/h
(26.63 m/s)
 1.81 J
NdFeB products are very brittle – a violent impact against metal risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or painful pinches to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Anti-corrosion coating durability
MW 12x6 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MW 12x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 024 Mx 50.2 µWb
Pc Coefficient 0.59 Low (Flat)
Flux value passing through the magnet pole. Key data when building generators as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Submerged application
MW 12x6 / N38

Environment Effective steel pull Effect
Air (land) 4.60 kg Standard
Water (riverbed) 5.27 kg
(+0.67 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!
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

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

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Heat tolerance

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.59

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%
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: 010021-2026
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The presented product is an extremely powerful rod magnet, manufactured from modern NdFeB material, which, at dimensions of Ø12x6 mm, guarantees maximum efficiency. The MW 12x6 / N38 model is characterized by a tolerance of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 4.60 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 45.09 N with a weight of only 5.09 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
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 precision component. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø12x6), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 12 mm and height 6 mm. The key parameter here is the lifting capacity amounting to approximately 4.60 kg (force ~45.09 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, 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. Such an arrangement is standard 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 through the diameter if your project requires it.

Pros and cons of rare earth magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • Their strength is durable, and after around 10 years it drops only by ~1% (theoretically),
  • Magnets effectively defend themselves against loss of magnetization caused by external fields,
  • In other words, due to the glossy layer of nickel, the element becomes visually attractive,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in designing and the capacity to modify to unusual requirements,
  • Significant place in modern technologies – they are utilized in magnetic memories, electric motors, medical devices, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in small systems

Disadvantages

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using a housing - magnetic mount.
  • Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small elements of these products are able to be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Holding force characteristics

Detachment force of the magnet in optimal conditions – what affects it?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:
  • on a base made of structural steel, optimally conducting the magnetic field
  • whose thickness reaches at least 10 mm
  • with a surface free of scratches
  • without any insulating layer between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

Holding efficiency is influenced by specific conditions, such as (from priority):
  • Gap (between the magnet and the plate), since even a tiny distance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Angle of force application – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Heat – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Compass and GPS

Remember: rare earth magnets generate a field that disrupts sensitive sensors. Keep a separation from your mobile, device, and navigation systems.

Do not drill into magnets

Machining of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Keep away from children

Neodymium magnets are not intended for children. Swallowing several magnets can lead to them connecting inside the digestive tract, which poses a critical condition and necessitates immediate surgery.

Implant safety

Patients with a heart stimulator should keep an absolute distance from magnets. The magnetism can interfere with the functioning of the implant.

Safe operation

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Eye protection

NdFeB magnets are sintered ceramics, meaning they are very brittle. Collision of two magnets leads to them breaking into shards.

Maximum temperature

Do not overheat. Neodymium magnets are sensitive to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Metal Allergy

Some people suffer from a hypersensitivity to nickel, which is the common plating for neodymium magnets. Prolonged contact may cause skin redness. It is best to use safety gloves.

Protect data

Intense magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

Crushing risk

Big blocks can crush fingers in a fraction of a second. Never place your hand betwixt two attracting surfaces.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?