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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

product parameters »

0.935 ZŁ with VAT / pcs + price for transport

0.760 ZŁ net + 23% VAT / pcs

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Product card - 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 assembly - data

Presented values constitute the outcome of a mathematical analysis. Results are based on algorithms for the material Nd2Fe14B. Real-world performance might slightly differ from theoretical values. Treat these data as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - power drop
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
 low risk
1 mm 1703 Gs
170.3 mT
 1.16 kg / 2.55 lbs
1155.6 g / 11.3 N
 low risk
2 mm 1453 Gs
145.3 mT
 0.84 kg / 1.85 lbs
840.3 g / 8.2 N
 low risk
3 mm 1190 Gs
119.0 mT
 0.56 kg / 1.24 lbs
564.1 g / 5.5 N
 low risk
5 mm 752 Gs
75.2 mT
 0.23 kg / 0.50 lbs
225.0 g / 2.2 N
 low risk
10 mm 241 Gs
24.1 mT
 0.02 kg / 0.05 lbs
23.2 g / 0.2 N
 low risk
15 mm 96 Gs
9.6 mT
 0.00 kg / 0.01 lbs
3.7 g / 0.0 N
 low risk
20 mm 46 Gs
4.6 mT
 0.00 kg / 0.00 lbs
0.9 g / 0.0 N
 low risk
30 mm 15 Gs
1.5 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 low risk
50 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
Grip strength weakens significantly per each millimeter of distance. Remember that even a very thin break (e.g., contamination, varnish, veneer) noticeably weakens the grip. Magnetic products work optimally in perfect adhesion; distance weakens the force. See how rapidly the parameters plummet, when the magnet does not adhere tightly to the metal substrate. When designing the assembly, avoid unnecessary gaps.

Table 2: Sliding force (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 table below calculates the approximate force needed to cause the downward movement of the magnet vertically against a vertical steel plate (assuming typical friction). The holding force depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 placing a holder on a upright surface (e.g., a car body), it you can count on only about 20%-30% of nominal attraction strength. Gravity and a low friction coefficient influence the fact that products slip faster than they pop off the substrate. Designing a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a slippery surface, the holder will slip down under a significantly smaller cargo. Using a rubber pad can significantly improve the result.

Table 4: Material efficiency (substrate influence) - 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 conduct the entire magnetic field, which weakens actual performance of the magnet. If you mount a strong magnet to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze the maximum of this neodymium's power, you require a sufficiently solid backing of steel. The material oversaturation means that on thin elements (e.g., thin profiles), the magnet shows lower pull force. We recommend selecting the steel dimension based on the following data.

Table 5: Working in heat (stability) - resistance threshold
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
Classic neodymiums change their properties power above the temperature limit. Protect against heat – heat can irreversibly damage this product. With increasing heat, the neodymium's force temporarily decreases. Avoid using this product in hot environments exceeding its safe range. Ignoring the limit will lead to permanent loss of magnetic properties.
*Technical advisory: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 12.5x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 setup. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Designing a strong closure? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the pinch force is massive. The repulsion force is slightly lower than the connection force, but still significant.
*The magnetic induction between like poles reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
* Results demonstrate friction force of a pair of matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - warnings
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
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Remote 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 electronics as well as medical implants. These neodymiums produce a flux that destroys function of digital equipment. Notice: the invisible magnetic field penetrates the body and plastic. Exceptional care must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
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 very brittle – a collision with steel causes immediate chipping. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Surface protection spec
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 (Pc)
MW 12.5x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 810 Mx 28.1 µWb
Pc Coefficient 0.24 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data for generator designers and motors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
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%
Corrosion warning: 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Caution: On a vertical wall, the magnet holds only a fraction of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Thermal stability

*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) = 0.24

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 specification and ecology
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%
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: 010014-2026
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This product is a very strong cylinder magnet, composed of modern NdFeB material, which, with dimensions of Ø12.5x2 mm, guarantees maximum efficiency. The MW 12.5x2 / N38 model is characterized by high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 1.42 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, 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 chipping the coating of this professional component. To ensure stability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for the majority 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 (Ø12.5x2), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 12.5 mm and height 2 mm. 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 grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, 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 through the diameter if your project requires it.

Pros and cons of Nd2Fe14B magnets.

Advantages

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
  • Neodymium magnets are distinguished by highly resistant to demagnetization caused by external interference,
  • A magnet with a metallic nickel surface has better aesthetics,
  • Magnetic induction on the top side of the magnet turns out to be impressive,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
  • Possibility of individual creating as well as adjusting to individual needs,
  • Versatile presence in modern industrial fields – they are utilized in data components, drive modules, medical equipment, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in compact constructions

Limitations

What to avoid - cons of neodymium magnets: weaknesses and usage proposals
  • At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • We recommend a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Due to complex production process, their price exceeds standard values,

Holding force characteristics

Optimal lifting capacity of a neodymium magnet – what contributes to it?

The specified lifting capacity refers to the peak performance, recorded under ideal test conditions, meaning:
  • using a plate made of high-permeability steel, serving as a ideal flux conductor
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a plane cleaned and smooth
  • under conditions of gap-free contact (metal-to-metal)
  • under axial application of breakaway force (90-degree angle)
  • at ambient temperature room level

Practical aspects of lifting capacity – factors

Please note that the magnet holding may be lower influenced by elements below, starting with the most relevant:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is available only during perpendicular pulling. The shear force of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Steel grade – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.

Warnings
Product not for children

NdFeB magnets are not toys. Accidental ingestion of several magnets can lead to them connecting inside the digestive tract, which poses a severe health hazard and requires immediate surgery.

Crushing risk

Big blocks can break fingers in a fraction of a second. Do not put your hand betwixt two attracting surfaces.

Threat to electronics

Data protection: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, medical aids, timepieces).

Allergic reactions

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness appears, immediately stop handling magnets and use protective gear.

Do not overheat magnets

Keep cool. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

GPS Danger

Be aware: rare earth magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, tablet, and GPS.

Dust explosion hazard

Powder generated during cutting of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Eye protection

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Respect the power

Use magnets consciously. Their powerful strength can surprise even experienced users. Plan your moves and respect their power.

Warning for heart patients

People with a pacemaker have to keep an safe separation from magnets. The magnetism can disrupt the functioning of the life-saving device.

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