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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 data »

1.882 ZŁ with VAT / pcs + price for transport

1.530 ZŁ net + 23% VAT / pcs

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Product card - 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

Physical simulation of the magnet - technical parameters

These information are the direct effect of a mathematical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Operational conditions might slightly differ. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static force (pull vs gap) - 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
 medium risk
1 mm 3688 Gs
368.8 mT
 3.27 kg / 7.20 lbs
3265.4 g / 32.0 N
 medium risk
2 mm 2999 Gs
299.9 mT
 2.16 kg / 4.76 lbs
2159.7 g / 21.2 N
 medium risk
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
Magnetic force decreases sharply with every subsequent millimeter of distance. Note that every additional insulation layer (e.g., dirt, varnish, veneer) strongly weakens the grip. Neodymiums operate strongest at the point of direct contact; air break kills the force. Analyze how rapidly the parameters plummet, when the magnet does not touch tightly to the metal substrate. When calculating the mounting, discard redundant distances.

Table 2: Shear force (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 shows the approximate force needed to initiate the shifting of the magnet downwards on a upright steel wall (considering standard friction coefficient). This value is a function of the gap size 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 holder on a upright wall (e.g., a fridge), it will maintain just approx. 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip cause that products move down easier than they pop off the substrate. Designing a wall mount? Note that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the magnet will slide down under a noticeably lighter load. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Material efficiency (saturation) - power losses
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 thin metal plate cannot absorb the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a thin surface, the flux will penetrate right through and the holding will be smaller. To utilize 100% of this neodymium's power, you require a sufficiently solid piece of metal. The saturation effect causes that on delicate walls (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal resistance (stability) - power drop
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
Standard neodymium magnets change their properties strength past the thermal threshold. Avoid high temperatures – heat can permanently damage this product. With increasing heat, the neodymium's force temporarily lowers. Do not use this product close to ovens higher than its operating temperature limit. Ignoring the limit will cause permanent loss of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low Pc) may lose charge permanently under lower heat stress compared to rod magnets. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field range
MW 12x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 strong neodymiums interact from a much further distance than a magnet and sheet combination. The setup of two magnets produces a massive flux and a wider radius of operation. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is extreme. The repulsion force is marginally weaker than the connection force, but still impressive.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle between the magnets (due to field cancellation).
Attention: Calculations demonstrate shear force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - warnings
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
Timepiece 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 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
Extremely neodym field poses a real danger to electronics as well as medical implants. These NdFeB products produce a flux that destroys function of sensitive medical devices. Be aware: the unseen radiation penetrates the body and plastic. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, speakers, and screens. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (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 delicate – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the neodymium. Use safety goggles when working with large magnets.

Table 9: Surface protection spec
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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
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 pole surface. Essential parameter for generator designers and motors. Pc value determines 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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Warning: On a vertical wall, the magnet holds merely a fraction of its max power.

2. Steel thickness impact

*Thin steel (e.g. computer case) severely limits the holding force.

3. Temperature resistance

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

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

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

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: 010021-2026
Magnet Unit Converter
Pulling force
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This product is an exceptionally strong rod magnet, produced from advanced NdFeB material, which, with dimensions of Ø12x6 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and professional build quality, making it an excellent solution for professional 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. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 45.09 N with a weight of only 5.09 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the recommended way 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, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger 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.
This model is characterized by dimensions Ø12x6 mm, which, at a weight of 5.09 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 4.60 kg (force ~45.09 N), which, with such compact dimensions, proves the high power 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 diametrically if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • In other words, due to the aesthetic finish of silver, the element becomes visually attractive,
  • They are known for high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
  • Possibility of exact forming and adjusting to concrete applications,
  • Key role in high-tech industry – they serve a role in computer drives, electric drive systems, precision medical tools, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices

Disadvantages

Disadvantages of neodymium 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.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complicated forms in magnets, we propose using cover - magnetic holder.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these devices are able to be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

Information about lifting capacity was defined for ideal contact conditions, assuming:
  • with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
  • whose transverse dimension reaches at least 10 mm
  • with an polished contact surface
  • with zero gap (without paint)
  • during pulling in a direction perpendicular to the mounting surface
  • in neutral thermal conditions

Lifting capacity in real conditions – factors

In practice, the actual holding force depends on many variables, presented from crucial:
  • Air gap (betwixt the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Plate thickness – too thin plate does not accept the full field, causing part of the flux to be wasted to the other side.
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate reduces the load capacity.

Precautions when working with NdFeB magnets
Conscious usage

Exercise caution. Neodymium magnets attract from a long distance and connect with huge force, often faster than you can react.

Keep away from computers

Do not bring magnets close to a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Keep away from electronics

GPS units and smartphones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

ICD Warning

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

No play value

Only for adults. Tiny parts can be swallowed, causing serious injuries. Store away from children and animals.

Machining danger

Dust produced during machining of magnets is combustible. Do not drill into magnets unless you are an expert.

Magnet fragility

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

Avoid contact if allergic

It is widely known that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, prevent touching magnets with bare hands and choose coated magnets.

Crushing risk

Watch your fingers. Two powerful magnets will snap together instantly with a force of massive weight, crushing anything in their path. Be careful!

Maximum temperature

Keep cool. NdFeB magnets are susceptible to heat. If you need operation above 80°C, inquire about HT versions (H, SH, UH).

Attention! Learn more about hazards in the article: Safety of working with magnets.