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MW 12.5x2 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010014

GTIN/EAN: 5906301810131

5.00

Diameter Ø

12.5 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

1.84 g

Magnetization Direction

↑ axial

Load capacity

1.42 kg / 13.89 N

Magnetic Induction

188.88 mT / 1889 Gs

Coating

[NiCuNi] Nickel

view technical data »

0.935 ZŁ with VAT / pcs + price for transport

0.760 ZŁ net + 23% VAT / pcs

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Technical specification of the product - MW 12.5x2 / N38 - cylindrical magnet

Specification / characteristics - MW 12.5x2 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010014
GTIN/EAN 5906301810131
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 12.5 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 1.84 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.42 kg / 13.89 N
Magnetic Induction ~ ? 188.88 mT / 1889 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12.5x2 / 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 modeling of the magnet - data

Presented values constitute the direct effect of a physical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Treat these data as a reference point for designers.

Table 1: Static force (pull vs distance) - interaction chart
MW 12.5x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1888 Gs
188.8 mT
 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
 weak grip
1 mm 1703 Gs
170.3 mT
 1.16 kg / 2.55 LBS
1155.6 g / 11.3 N
 weak grip
2 mm 1453 Gs
145.3 mT
 0.84 kg / 1.85 LBS
840.3 g / 8.2 N
 weak grip
3 mm 1190 Gs
119.0 mT
 0.56 kg / 1.24 LBS
564.1 g / 5.5 N
 weak grip
5 mm 752 Gs
75.2 mT
 0.23 kg / 0.50 LBS
225.0 g / 2.2 N
 weak grip
10 mm 241 Gs
24.1 mT
 0.02 kg / 0.05 LBS
23.2 g / 0.2 N
 weak grip
15 mm 96 Gs
9.6 mT
 0.00 kg / 0.01 LBS
3.7 g / 0.0 N
 weak grip
20 mm 46 Gs
4.6 mT
 0.00 kg / 0.00 LBS
0.9 g / 0.0 N
 weak grip
30 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 LBS
0.1 g / 0.0 N
 weak grip
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 weak grip
Pulling power drops sharply with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., dirt, varnish, dust) significantly reduces the pull force. Neodymiums hold most effectively during direct contact; distance nullifies the power. See how rapidly the load capacity drop, when the magnet does not adhere tightly to the steel surface. When calculating the arrangement, eliminate redundant distances.

Table 2: Sliding capacity (wall)
MW 12.5x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.28 kg / 0.63 LBS
284.0 g / 2.8 N
1 mm Stal (~0.2) 0.23 kg / 0.51 LBS
232.0 g / 2.3 N
2 mm Stal (~0.2) 0.17 kg / 0.37 LBS
168.0 g / 1.6 N
3 mm Stal (~0.2) 0.11 kg / 0.25 LBS
112.0 g / 1.1 N
5 mm Stal (~0.2) 0.05 kg / 0.10 LBS
46.0 g / 0.5 N
10 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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 shows the estimated shear load needed to cause the sliding of the magnet down on a upright steel wall (assuming standard friction coefficient). This value depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MW 12.5x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.43 kg / 0.94 LBS
426.0 g / 4.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.28 kg / 0.63 LBS
284.0 g / 2.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.14 kg / 0.31 LBS
142.0 g / 1.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.71 kg / 1.57 LBS
710.0 g / 7.0 N
When hanging a holder on a upright wall (e.g., a car body), it will maintain only about 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient mean that products move down faster than they pop off the substrate. Planning a hanger? Remember that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will give way down under a much lighter weight. Using a rubber layer can significantly increase the grip.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 12.5x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.14 kg / 0.31 LBS
142.0 g / 1.4 N
1 mm
25%
 0.36 kg / 0.78 LBS
355.0 g / 3.5 N
2 mm
50%
 0.71 kg / 1.57 LBS
710.0 g / 7.0 N
3 mm
75%
 1.07 kg / 2.35 LBS
1065.0 g / 10.4 N
5 mm
100%
 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
10 mm
100%
 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
11 mm
100%
 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
12 mm
100%
 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
A thin metal plate is unable to focus the full magnetic flux, which squanders power of the holder. If you mount a strong magnet to a too thin substrate, the magnetism will pass right through and the attraction force will be weaker. To utilize 100% of this neodymium's potential, you need a suitably thick piece of steel. The saturation effect means that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Thermal resistance (material behavior) - power drop
MW 12.5x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
 OK
40 °C -2.2% 1.39 kg / 3.06 LBS
1388.8 g / 13.6 N
 OK
60 °C -4.4% 1.36 kg / 2.99 LBS
1357.5 g / 13.3 N
80 °C -6.6% 1.33 kg / 2.92 LBS
1326.3 g / 13.0 N
100 °C -28.8% 1.01 kg / 2.23 LBS
1011.0 g / 9.9 N
Ordinary NdFeB products irreversibly lose parameters past the thermal threshold. Watch out for overheating – excessive heat can permanently damage this product. With every degree above norm, the neodymium's capacity briefly decreases. Refrain from using this product near heat sources exceeding its safe range. Too high temperature will cause permanent loss of magnetic properties.
*Important note: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) may lose charge permanently under lower heat stress than taller cylinders. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 12.5x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.70 kg / 5.95 LBS
3 338 Gs
0.40 kg / 0.89 LBS
405 g / 4.0 N
 N/A
1 mm 2.47 kg / 5.45 LBS
3 616 Gs
0.37 kg / 0.82 LBS
371 g / 3.6 N
 2.23 kg / 4.91 LBS
~0 Gs
2 mm 2.20 kg / 4.84 LBS
3 407 Gs
0.33 kg / 0.73 LBS
329 g / 3.2 N
 1.98 kg / 4.36 LBS
~0 Gs
3 mm 1.89 kg / 4.18 LBS
3 165 Gs
0.28 kg / 0.63 LBS
284 g / 2.8 N
 1.71 kg / 3.76 LBS
~0 Gs
5 mm 1.32 kg / 2.91 LBS
2 640 Gs
0.20 kg / 0.44 LBS
198 g / 1.9 N
 1.19 kg / 2.62 LBS
~0 Gs
10 mm 0.43 kg / 0.94 LBS
1 503 Gs
0.06 kg / 0.14 LBS
64 g / 0.6 N
 0.38 kg / 0.85 LBS
~0 Gs
20 mm 0.04 kg / 0.10 LBS
483 Gs
0.01 kg / 0.01 LBS
7 g / 0.1 N
 0.04 kg / 0.09 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
51 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
31 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
20 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
14 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
10 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
7 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 neodymium and metal combination. The connection of two magnets produces a massive flux and a wider radius of performance. Want to build a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the collision energy is extreme. The levitation is slightly lower than the attraction, but still large.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
Attention: Figures refer to shear force of dual same magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - precautionary measures
MW 12.5x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.5 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Timepiece 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Car key 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation poses a real danger to electronic devices as well as pacemakers. These neodymiums produce a flux that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Special caution must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MW 12.5x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.30 km/h
(7.86 m/s)
 0.06 J
30 mm 48.53 km/h
(13.48 m/s)
 0.17 J
50 mm 62.65 km/h
(17.40 m/s)
 0.28 J
100 mm 88.60 km/h
(24.61 m/s)
 0.56 J
Magnetic elements are prone to chipping – a strong collision with metal causes immediate chipping. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or dangerous crushing to skin. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Corrosion resistance
MW 12.5x2 / 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 following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MW 12.5x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 810 Mx 28.1 µWb
Pc Coefficient 0.24 Low (Flat)
Flux value passing through the magnet pole. Essential parameter in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 12.5x2 / N38

Environment Effective steel pull Effect
Air (land) 1.42 kg Standard
Water (riverbed) 1.63 kg
(+0.21 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Caution: On a vertical wall, the magnet retains just a fraction of its nominal pull.

2. Plate thickness effect

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

3. Temperature resistance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.24

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 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: 010014-2026
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This product is an incredibly powerful cylindrical magnet, composed of advanced NdFeB material, which, with dimensions of Ø12.5x2 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 1.42 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 13.89 N with a weight of only 1.84 g, this rod is indispensable in electronics and wherever low weight is crucial.
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 stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø12.5x2), 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 Ø12.5x2 mm, which, at a weight of 1.84 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 1.42 kg (force ~13.89 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 2 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 diametrically if your project requires it.

Pros and cons of rare earth magnets.

Advantages

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They retain full power for around 10 years – the drop is just ~1% (based on simulations),
  • They maintain their magnetic properties even under close interference source,
  • The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnetic induction on the working part of the magnet remains extremely intense,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of precise forming and adjusting to individual applications,
  • Huge importance in advanced technology sectors – they find application in magnetic memories, drive modules, medical devices, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in compact constructions

Limitations

Cons of neodymium magnets and ways of using them
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing nuts in the magnet and complex forms - preferred is casing - magnetic holder.
  • Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to complicate diagnosis medical after entering the body.
  • Due to complex production process, their price is higher than average,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what it depends on?

The declared magnet strength concerns the maximum value, obtained under laboratory conditions, specifically:
  • on a plate made of structural steel, perfectly concentrating the magnetic flux
  • with a cross-section of at least 10 mm
  • with a plane perfectly flat
  • under conditions of no distance (metal-to-metal)
  • under vertical application of breakaway force (90-degree angle)
  • at ambient temperature room level

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the magnet holding will differ influenced by elements below, starting with the most relevant:
  • Gap (betwixt the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Steel thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be lost into the air.
  • Steel grade – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature influence – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance between the magnet and the plate lowers the holding force.

H&S for magnets
Nickel allergy

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness appears, cease working with magnets and use protective gear.

Electronic devices

Do not bring magnets close to a wallet, computer, or screen. The magnetic field can destroy these devices and erase data from cards.

Pinching danger

Big blocks can break fingers in a fraction of a second. Never place your hand between two strong magnets.

Shattering risk

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Health Danger

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Respect the power

Exercise caution. Neodymium magnets attract from a distance and connect with huge force, often quicker than you can move away.

Flammability

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Keep away from children

Absolutely keep magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are life-threatening.

Precision electronics

Be aware: neodymium magnets produce a field that disrupts sensitive sensors. Maintain a separation from your phone, tablet, and GPS.

Operating temperature

Standard neodymium magnets (grade N) lose power when the temperature exceeds 80°C. The loss of strength is permanent.

Safety First! Looking for details? Check our post: Why are neodymium magnets dangerous?