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MW 12x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010019

GTIN/EAN: 5906301810186

5.00

Diameter Ø

12 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

3.39 g

Magnetization Direction

↑ axial

Load capacity

3.45 kg / 33.81 N

Magnetic Induction

343.64 mT / 3436 Gs

Coating

[NiCuNi] Nickel

check parameters »

1.353 ZŁ with VAT / pcs + price for transport

1.100 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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Product card - MW 12x4 / N38 - cylindrical magnet

Specification / characteristics - MW 12x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010019
GTIN/EAN 5906301810186
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 ~ ? 3.45 kg / 33.81 N
Magnetic Induction ~ ? 343.64 mT / 3436 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12x4 / 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

Technical simulation of the assembly - report

These data are the outcome of a mathematical calculation. Values were calculated on models for the material Nd2Fe14B. Actual parameters may differ. Treat these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - characteristics
MW 12x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3435 Gs
343.5 mT
 3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
 medium risk
1 mm 2950 Gs
295.0 mT
 2.54 kg / 5.61 LBS
2544.7 g / 25.0 N
 medium risk
2 mm 2423 Gs
242.3 mT
 1.72 kg / 3.79 LBS
1717.5 g / 16.8 N
 weak grip
3 mm 1935 Gs
193.5 mT
 1.09 kg / 2.41 LBS
1094.6 g / 10.7 N
 weak grip
5 mm 1190 Gs
119.0 mT
 0.41 kg / 0.91 LBS
413.8 g / 4.1 N
 weak grip
10 mm 382 Gs
38.2 mT
 0.04 kg / 0.09 LBS
42.7 g / 0.4 N
 weak grip
15 mm 156 Gs
15.6 mT
 0.01 kg / 0.02 LBS
7.1 g / 0.1 N
 weak grip
20 mm 76 Gs
7.6 mT
 0.00 kg / 0.00 LBS
1.7 g / 0.0 N
 weak grip
30 mm 26 Gs
2.6 mT
 0.00 kg / 0.00 LBS
0.2 g / 0.0 N
 weak grip
50 mm 6 Gs
0.6 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Pulling power decreases sharply with every subsequent millimeter of distance. Remember that even a very thin break (e.g., dirt, varnish, dust) noticeably reduces the pull force. Magnetic products operate most effectively at the point of direct contact; gap weakens the force. Notice how quickly the parameters plummet, when the magnet does not adhere flatly to the steel surface. When designing the mounting, eliminate additional spacers.

Table 2: Shear capacity (vertical surface)
MW 12x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.69 kg / 1.52 LBS
690.0 g / 6.8 N
1 mm Stal (~0.2) 0.51 kg / 1.12 LBS
508.0 g / 5.0 N
2 mm Stal (~0.2) 0.34 kg / 0.76 LBS
344.0 g / 3.4 N
3 mm Stal (~0.2) 0.22 kg / 0.48 LBS
218.0 g / 2.1 N
5 mm Stal (~0.2) 0.08 kg / 0.18 LBS
82.0 g / 0.8 N
10 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 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
This section shows the estimated shear load required to initiate the sliding of the magnet down on a upright metal surface (assuming standard friction coefficient). The holding force is a function of the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 12x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.04 kg / 2.28 LBS
1035.0 g / 10.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.69 kg / 1.52 LBS
690.0 g / 6.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.35 kg / 0.76 LBS
345.0 g / 3.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.73 kg / 3.80 LBS
1725.0 g / 16.9 N
When hanging a holder on a upright plane (e.g., a board), it will only hold just about 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient influence the fact that holders move down faster than they detach. Designing a vertical fastening? Note that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the element will slip down under a much lighter cargo. Using a rubber pad can significantly raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MW 12x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.35 kg / 0.76 LBS
345.0 g / 3.4 N
1 mm
25%
 0.86 kg / 1.90 LBS
862.5 g / 8.5 N
2 mm
50%
 1.73 kg / 3.80 LBS
1725.0 g / 16.9 N
3 mm
75%
 2.59 kg / 5.70 LBS
2587.5 g / 25.4 N
5 mm
100%
 3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
10 mm
100%
 3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
11 mm
100%
 3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
12 mm
100%
 3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
A too thin steel is incapable of absorb the full magnetic flux, which wastes potential of the magnet. If you attach a powerful product to a weak sheet, 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 piece of metal. The saturation effect causes that on sheet metal structures (e.g., car bodies), the holder works worse. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal resistance (material behavior) - thermal limit
MW 12x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
 OK
40 °C -2.2% 3.37 kg / 7.44 LBS
3374.1 g / 33.1 N
 OK
60 °C -4.4% 3.30 kg / 7.27 LBS
3298.2 g / 32.4 N
80 °C -6.6% 3.22 kg / 7.10 LBS
3222.3 g / 31.6 N
100 °C -28.8% 2.46 kg / 5.42 LBS
2456.4 g / 24.1 N
Standard neodymium magnets change their properties power above the temperature limit. Avoid high temperatures – high temperature can permanently destroy this magnet. With every degree above norm, the magnet's force temporarily lowers. Refrain from using this product near heat sources exceeding its safe range. Ignoring the limit will result in destruction of magnetic properties.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than long magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 12x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.23 kg / 18.13 LBS
4 952 Gs
1.23 kg / 2.72 LBS
1234 g / 12.1 N
 N/A
1 mm 7.16 kg / 15.79 LBS
6 410 Gs
1.07 kg / 2.37 LBS
1074 g / 10.5 N
 6.45 kg / 14.21 LBS
~0 Gs
2 mm 6.07 kg / 13.38 LBS
5 900 Gs
0.91 kg / 2.01 LBS
910 g / 8.9 N
 5.46 kg / 12.04 LBS
~0 Gs
3 mm 5.03 kg / 11.09 LBS
5 372 Gs
0.75 kg / 1.66 LBS
754 g / 7.4 N
 4.53 kg / 9.98 LBS
~0 Gs
5 mm 3.29 kg / 7.25 LBS
4 342 Gs
0.49 kg / 1.09 LBS
493 g / 4.8 N
 2.96 kg / 6.52 LBS
~0 Gs
10 mm 0.99 kg / 2.18 LBS
2 379 Gs
0.15 kg / 0.33 LBS
148 g / 1.5 N
 0.89 kg / 1.96 LBS
~0 Gs
20 mm 0.10 kg / 0.22 LBS
764 Gs
0.02 kg / 0.03 LBS
15 g / 0.1 N
 0.09 kg / 0.20 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
85 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
52 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
34 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
23 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
17 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
12 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 much further distance than a neodymium and metal combination. The setup of two magnets generates a stronger field and a wider radius of performance. Designing a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the impact force is massive. The repulsion force is a bit weaker than the attraction, but still large.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
Important: Calculations demonstrate shear force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (electronics) - precautionary measures
MW 12x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.5 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Timepiece 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field is a large risk to electronic devices and medical implants. These neodymiums generate a field that disrupts operation of digital equipment. Be aware: the unseen radiation passes through tissues and plastic. Exceptional care must be exercised by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - collision effects
MW 12x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 32.42 km/h
(9.01 m/s)
 0.14 J
30 mm 55.73 km/h
(15.48 m/s)
 0.41 J
50 mm 71.94 km/h
(19.98 m/s)
 0.68 J
100 mm 101.74 km/h
(28.26 m/s)
 1.35 J
NdFeB products are delicate – a violent impact against metal causes immediate chipping. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can trigger coating fragments or dangerous crushing to skin. Always hold the magnet during mounting 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 neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Surface protection spec
MW 12x4 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Pc)
MW 12x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 114 Mx 41.1 µWb
Pc Coefficient 0.44 Low (Flat)
Total magnetic flux emitted by the pole surface. Key data when building generators as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 12x4 / N38

Environment Effective steel pull Effect
Air (land) 3.45 kg Standard
Water (riverbed) 3.95 kg
(+0.50 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. 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 just ~20% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically reduces the holding force.

3. Thermal stability

*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) = 0.44

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: 010019-2026
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The presented product is an incredibly powerful cylinder magnet, composed of modern NdFeB material, which, at dimensions of Ø12x4 mm, guarantees the highest energy density. The MW 12x4 / N38 model features an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 3.45 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created 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 33.81 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 immediate cracking of this professional component. To ensure long-term durability 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 suitable 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 (Ø12x4), 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 Ø12x4 mm, which, at a weight of 3.39 g, makes it an element with impressive magnetic energy density. The value of 33.81 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 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 as well as cons of rare earth magnets.

Pros

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They do not lose strength, even over around ten years – the decrease in power is only ~1% (according to tests),
  • They maintain their magnetic properties even under close interference source,
  • In other words, due to the glossy surface of gold, the element looks attractive,
  • Magnetic induction on the working layer of the magnet turns out to be maximum,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of individual machining as well as optimizing to defined needs,
  • Wide application in modern industrial fields – they are used in hard drives, electric drive systems, diagnostic systems, also technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Weaknesses

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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 very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited possibility of creating nuts in the magnet and complex shapes - recommended is casing - magnet mounting.
  • Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small components of these magnets can be problematic in diagnostics medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Lifting parameters

Maximum holding power of the magnet – what it depends on?

The lifting capacity listed is a theoretical maximum value performed under specific, ideal conditions:
  • on a block made of structural steel, optimally conducting the magnetic flux
  • with a thickness no less than 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (surface-to-surface)
  • under perpendicular force direction (90-degree angle)
  • at temperature room level

Magnet lifting force in use – key factors

During everyday use, the real power results from many variables, presented from crucial:
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is high-permeability steel. Cast iron may attract less.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. Additionally, even a slight gap between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Demagnetization risk

Control the heat. Heating the magnet to high heat will permanently weaken its properties and strength.

Threat to navigation

Navigation devices and mobile phones are highly sensitive to magnetism. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Data carriers

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

Do not drill into magnets

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Physical harm

Mind your fingers. Two large magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Beware of splinters

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Do not underestimate power

Handle magnets consciously. Their immense force can surprise even experienced users. Stay alert and do not underestimate their power.

Medical interference

Warning for patients: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Danger to the youngest

NdFeB magnets are not toys. Accidental ingestion of a few magnets can lead to them attracting across intestines, which constitutes a direct threat to life and necessitates urgent medical intervention.

Metal Allergy

It is widely known that nickel (standard magnet coating) is a potent allergen. For allergy sufferers, avoid direct skin contact or choose coated magnets.

Safety First! Need more info? Read our article: Why are neodymium magnets dangerous?