MW 12.5x2 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010014
GTIN/EAN: 5906301810131
- 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
0.760 zł net / pcs
0.935 zł with VAT (23% VAT) / pcs
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Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
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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Technical data - MW 12.5x2 / N38 - cylindrical magnet
Specification / characteristics - MW 12.5x2 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010014 |
| GTIN/EAN | 5906301810131 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 |
|
0.14 kg / 0.31 LBS
142.0 g / 1.4 N
|
| 1 mm |
|
0.36 kg / 0.78 LBS
355.0 g / 3.5 N
|
| 2 mm |
|
0.71 kg / 1.57 LBS
710.0 g / 7.0 N
|
| 3 mm |
|
1.07 kg / 2.35 LBS
1065.0 g / 10.4 N
|
| 5 mm |
|
1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
|
| 10 mm |
|
1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
|
| 11 mm |
|
1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
|
| 12 mm |
|
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% |
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.
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 |
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Pros and cons of neodymium magnets.
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
- 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 force – what it depends on?
- 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
- 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
Keep away from computers
Device Safety: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, timepieces).
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.
Powerful field
Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.
Shattering risk
Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.
Crushing risk
Danger of trauma: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.
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).
Flammability
Dust created during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Implant safety
Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.
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.
