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MW 12x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010022

GTIN/EAN: 5906301810216

5.00

Diameter Ø

12 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

6.79 g

Magnetization Direction

↑ axial

Load capacity

4.93 kg / 48.32 N

Magnetic Induction

495.50 mT / 4955 Gs

Coating

[NiCuNi] Nickel

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2.47 ZŁ with VAT / pcs + price for transport

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Technical data of the product - MW 12x8 / N38 - cylindrical magnet

Specification / characteristics - MW 12x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010022
GTIN/EAN 5906301810216
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 8 mm [±0,1 mm]
Weight 6.79 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.93 kg / 48.32 N
Magnetic Induction ~ ? 495.50 mT / 4955 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12x8 / 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 magnet - technical parameters

These information represent the direct effect of a physical simulation. Results rely on algorithms for the material Nd2Fe14B. Actual performance may differ from theoretical values. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs distance) - characteristics
MW 12x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4952 Gs
495.2 mT
 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
 strong
1 mm 4139 Gs
413.9 mT
 3.44 kg / 7.59 lbs
3445.0 g / 33.8 N
 strong
2 mm 3356 Gs
335.6 mT
 2.26 kg / 4.99 lbs
2264.2 g / 22.2 N
 strong
3 mm 2670 Gs
267.0 mT
 1.43 kg / 3.16 lbs
1433.5 g / 14.1 N
 safe
5 mm 1660 Gs
166.0 mT
 0.55 kg / 1.22 lbs
554.1 g / 5.4 N
 safe
10 mm 565 Gs
56.5 mT
 0.06 kg / 0.14 lbs
64.3 g / 0.6 N
 safe
15 mm 243 Gs
24.3 mT
 0.01 kg / 0.03 lbs
11.8 g / 0.1 N
 safe
20 mm 124 Gs
12.4 mT
 0.00 kg / 0.01 lbs
3.1 g / 0.0 N
 safe
30 mm 45 Gs
4.5 mT
 0.00 kg / 0.00 lbs
0.4 g / 0.0 N
 safe
50 mm 11 Gs
1.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 safe
Grip strength decreases significantly with every subsequent millimeter of spacing. Keep in mind that even a microscopic distance (e.g., contamination, paint, rust) strongly diminishes the holding power. Magnets operate optimally in perfect adhesion; air break weakens the power. Observe how rapidly the load capacity plummet, when the product does not adhere directly to the steel surface. When planning the assembly, discard additional spacers.

Table 2: Vertical force (wall)
MW 12x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.99 kg / 2.17 lbs
986.0 g / 9.7 N
1 mm Stal (~0.2) 0.69 kg / 1.52 lbs
688.0 g / 6.7 N
2 mm Stal (~0.2) 0.45 kg / 1.00 lbs
452.0 g / 4.4 N
3 mm Stal (~0.2) 0.29 kg / 0.63 lbs
286.0 g / 2.8 N
5 mm Stal (~0.2) 0.11 kg / 0.24 lbs
110.0 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 calculates the approximate shear load necessary to cause the sliding of the magnet down on a upright steel plate (considering standard friction). This parameter is a function of the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 12x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.48 kg / 3.26 lbs
1479.0 g / 14.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.99 kg / 2.17 lbs
986.0 g / 9.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.49 kg / 1.09 lbs
493.0 g / 4.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.47 kg / 5.43 lbs
2465.0 g / 24.2 N
When mounting a magnet on a vertical wall (e.g., a car body), it will maintain barely approx. 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that holders slide down faster than they pull off. Designing a vertical fastening? Remember that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the element will give way down under a noticeably lighter weight. Using a rubber coating can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 12x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.49 kg / 1.09 lbs
493.0 g / 4.8 N
1 mm
25%
 1.23 kg / 2.72 lbs
1232.5 g / 12.1 N
2 mm
50%
 2.47 kg / 5.43 lbs
2465.0 g / 24.2 N
3 mm
75%
 3.70 kg / 8.15 lbs
3697.5 g / 36.3 N
5 mm
100%
 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
10 mm
100%
 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
11 mm
100%
 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
12 mm
100%
 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
A too thin steel is incapable of take in the full magnetic flux, which squanders power of the holder. Should you install a neodymium to a weak sheet, the field will pass right through and the pull force will drop sharply. To utilize 100% of this neodymium's potential, you need a suitably thick piece of metal. The saturation phenomenon causes that on delicate walls (e.g., thin profiles), the holder shows lower pull force. We advise picking the steel dimension based on the following data.

Table 5: Thermal resistance (stability) - resistance threshold
MW 12x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
 OK
40 °C -2.2% 4.82 kg / 10.63 lbs
4821.5 g / 47.3 N
 OK
60 °C -4.4% 4.71 kg / 10.39 lbs
4713.1 g / 46.2 N
 OK
80 °C -6.6% 4.60 kg / 10.15 lbs
4604.6 g / 45.2 N
100 °C -28.8% 3.51 kg / 7.74 lbs
3510.2 g / 34.4 N
Standard neodymium magnets lose strength above the temperature limit. Watch out for overheating – heat can irreversibly destroy this product. With increasing heat, the magnet's force briefly decreases. Do not use this product close to heaters exceeding its safe range. Too high temperature will result in permanent loss of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization sooner than long magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 12x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.10 kg / 37.69 lbs
5 795 Gs
2.56 kg / 5.65 lbs
2565 g / 25.2 N
 N/A
1 mm 14.44 kg / 31.83 lbs
9 101 Gs
2.17 kg / 4.77 lbs
2166 g / 21.2 N
 12.99 kg / 28.64 lbs
~0 Gs
2 mm 11.95 kg / 26.34 lbs
8 279 Gs
1.79 kg / 3.95 lbs
1792 g / 17.6 N
 10.75 kg / 23.71 lbs
~0 Gs
3 mm 9.74 kg / 21.48 lbs
7 477 Gs
1.46 kg / 3.22 lbs
1462 g / 14.3 N
 8.77 kg / 19.33 lbs
~0 Gs
5 mm 6.27 kg / 13.82 lbs
5 997 Gs
0.94 kg / 2.07 lbs
940 g / 9.2 N
 5.64 kg / 12.44 lbs
~0 Gs
10 mm 1.92 kg / 4.24 lbs
3 320 Gs
0.29 kg / 0.64 lbs
288 g / 2.8 N
 1.73 kg / 3.81 lbs
~0 Gs
20 mm 0.22 kg / 0.49 lbs
1 131 Gs
0.03 kg / 0.07 lbs
33 g / 0.3 N
 0.20 kg / 0.44 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
142 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
89 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
59 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
41 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
30 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
23 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 much further distance than a magnet and steel setup. The setup of two magnets produces a massive flux and a larger range of performance. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the pinch force is huge. The levitation is marginally weaker than the attraction, but still large.
*The magnetic induction between like poles drops to ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Important: Calculations show sliding force of dual matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - precautionary measures
MW 12x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 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 is a large risk to electronic devices and medical implants. These NdFeB products generate a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field acts through matter and glass. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
MW 12x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.40 km/h
(7.61 m/s)
 0.20 J
30 mm 47.07 km/h
(13.08 m/s)
 0.58 J
50 mm 60.77 km/h
(16.88 m/s)
 0.97 J
100 mm 85.94 km/h
(23.87 m/s)
 1.93 J
NdFeB products are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Corrosion resistance
MW 12x8 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 12x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 650 Mx 56.5 µWb
Pc Coefficient 0.71 High (Stable)
Total magnetic flux passing through the pole surface. Essential parameter for generator designers and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MW 12x8 / N38

Environment Effective steel pull Effect
Air (land) 4.93 kg Standard
Water (riverbed) 5.64 kg
(+0.71 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.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

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

2. Plate thickness effect

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

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.71

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
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: 010022-2026
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The offered product is a very strong cylinder magnet, composed of advanced NdFeB material, which, with dimensions of Ø12x8 mm, guarantees the highest energy density. The MW 12x8 / N38 model is characterized by high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 4.93 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 48.32 N with a weight of only 6.79 g, this cylindrical magnet 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 automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø12x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 12 mm and height 8 mm. The value of 48.32 N means that the magnet is capable of holding a weight many times exceeding its own mass of 6.79 g. The product has a [NiCuNi] coating, which protects the surface 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. 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 as well as cons of neodymium magnets.

Pros

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their strength is durable, and after approximately ten years it decreases only by ~1% (according to research),
  • Neodymium magnets are characterized by extremely resistant to loss of magnetic properties caused by external field sources,
  • A magnet with a smooth silver surface has an effective appearance,
  • Neodymium magnets generate maximum magnetic induction on a their surface, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to the option of accurate shaping and customization to specialized requirements, neodymium magnets can be manufactured in a broad palette of shapes and sizes, which increases their versatility,
  • Huge importance in modern industrial fields – they are used in hard drives, drive modules, precision medical tools, as well as industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages

Cons of neodymium magnets: tips and applications.
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience 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
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of making nuts in the magnet and complex shapes - recommended is cover - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small components of these products are able to complicate diagnosis medical in case of swallowing.
  • Due to complex production process, their price exceeds standard values,

Holding force characteristics

Magnetic strength at its maximum – what it depends on?

Holding force of 4.93 kg is a theoretical maximum value performed under standard conditions:
  • with the contact of a sheet made of special test steel, ensuring maximum field concentration
  • with a cross-section minimum 10 mm
  • with a plane free of scratches
  • with zero gap (no coatings)
  • under vertical application of breakaway force (90-degree angle)
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

In practice, the actual holding force is determined by a number of factors, ranked from most significant:
  • Clearance – the presence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Direction of force – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Surface quality – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Thermal factor – hot environment weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the holding force is lower. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Safety rules for work with neodymium magnets
Powerful field

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Bone fractures

Danger of trauma: The attraction force is so great that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Do not overheat magnets

Monitor thermal conditions. Heating the magnet to high heat will ruin its magnetic structure and pulling force.

Magnetic interference

GPS units and smartphones are highly susceptible to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Choking Hazard

Absolutely keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets connecting inside the body are tragic.

Data carriers

Do not bring magnets near a wallet, computer, or TV. The magnetism can destroy these devices and wipe information from cards.

Combustion hazard

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

Shattering risk

Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.

Warning for allergy sufferers

A percentage of the population have a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Extended handling can result in skin redness. It is best to use protective gloves.

Pacemakers

For implant holders: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.

Security! Details about hazards in the article: Safety of working with magnets.