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MW 12.5x2 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010014

GTIN/EAN: 5906301810131

5.00
Load capacity 1.42 kg / 13.89 N Magnetic Induction 188.88 mT / 1889 Gs
Diameter Ø
12.5 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
1.84 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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price from 768 pcs
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Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

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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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical data - 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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

The following data constitute the outcome of a engineering calculation. Values rely on models for the class Nd2Fe14B. Actual parameters may differ from theoretical values. Use these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs distance) - characteristics
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
safe
1 mm 1703 Gs
170.3 mT
1.16 kg / 2.55 LBS
1155.6 g / 11.3 N
safe
2 mm 1453 Gs
145.3 mT
0.84 kg / 1.85 LBS
840.3 g / 8.2 N
safe
3 mm 1190 Gs
119.0 mT
0.56 kg / 1.24 LBS
564.1 g / 5.5 N
safe
5 mm 752 Gs
75.2 mT
0.23 kg / 0.50 LBS
225.0 g / 2.2 N
safe
10 mm 241 Gs
24.1 mT
0.02 kg / 0.05 LBS
23.2 g / 0.2 N
safe
15 mm 96 Gs
9.6 mT
0.00 kg / 0.01 LBS
3.7 g / 0.0 N
safe
20 mm 46 Gs
4.6 mT
0.00 kg / 0.00 LBS
0.9 g / 0.0 N
safe
30 mm 15 Gs
1.5 mT
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
safe
50 mm 4 Gs
0.4 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

Table 2: Shear hold (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

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

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

Table 5: Working in heat (material behavior) - 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

Table 6: Two magnets (attraction) - field range
MW 12.5x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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

Table 7: Protective zones (electronics) - 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
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

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.00 km/h
(6.67 m/s)
0.04 J
30 mm 24.19 km/h
(6.72 m/s)
0.04 J
50 mm 24.19 km/h
(6.72 m/s)
0.04 J
100 mm 24.19 km/h
(6.72 m/s)
0.04 J

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)

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)

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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

1. Vertical hold

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

2. Steel saturation

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

3. Heat tolerance

*For N38 material, the max working temp is 80°C.

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

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

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.

Engineering data and GPSR

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: 010014-2026
Measurement Calculator

Force (pull)


Field Strength

Check out more offers

This product is an incredibly powerful rod magnet, composed of modern NdFeB material, which, at dimensions of Ø12.5x2 mm, guarantees maximum efficiency. This specific item is characterized by a tolerance of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with significant force (approx. 1.42 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect 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 13.89 N with a weight of only 1.84 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 12.5.1 mm) using two-component epoxy glues. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are suitable for the majority of applications in automation 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 impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 1.42 kg (force ~13.89 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 2 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable 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 and cons of neodymium magnets.

Advantages

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their magnetic field remains stable, and after around ten years it decreases only by ~1% (according to research),
  • They are noted for resistance to demagnetization induced by external field influence,
  • Thanks to the smooth finish, the coating of nickel, gold-plated, or silver gives an modern appearance,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
  • 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...
  • Considering the potential of free shaping and adaptation to unique solutions, magnetic components can be produced in a variety of forms and dimensions, which expands the range of possible applications,
  • Versatile presence in innovative solutions – they are used in HDD drives, drive modules, diagnostic systems, and multitasking production systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Limitations

Cons of neodymium magnets: tips and applications.
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, 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 when they are in the body.
  • With mass production the cost of neodymium magnets is a challenge,

Holding force characteristics

Highest magnetic holding forcewhat it depends on?

Holding force of 1.42 kg is a theoretical maximum value performed under standard conditions:
  • with the use of a sheet made of special test steel, ensuring full magnetic saturation
  • with a thickness of at least 10 mm
  • with a surface cleaned and smooth
  • under conditions of no distance (surface-to-surface)
  • for force applied at a right angle (in the magnet axis)
  • at room temperature

Lifting capacity in real conditions – factors

It is worth knowing that the working load will differ influenced by elements below, in order of importance:
  • Air gap (betwixt the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Loading method – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Chemical composition of the base – mild steel gives the best results. Alloy steels reduce magnetic permeability and lifting capacity.
  • Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
  • Temperature – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet and the plate lowers the lifting capacity.

Warnings
Powerful field

Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.

Adults only

Always keep magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are tragic.

Warning for allergy sufferers

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness occurs, cease handling magnets and wear gloves.

Flammability

Dust created during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Crushing risk

Danger of trauma: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Implant safety

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Shattering risk

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Keep away from computers

Device Safety: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, timepieces).

GPS Danger

GPS units and mobile phones are highly susceptible to magnetic fields. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Thermal limits

Do not overheat. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Safety First! Learn more about risks in the article: Magnet Safety Guide.