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
Load capacity
1.42 kg / 13.89 N
Magnetic Induction
188.88 mT / 1889 Gs
Coating
[NiCuNi] Nickel
0.935 ZŁ with VAT / pcs + price for transport
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Physical properties - 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 |
|---|---|---|
| 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
| 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 analysis of the assembly - technical parameters
Presented data constitute the result of a mathematical calculation. Results rely on algorithms for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Treat these data as a reference point when designing systems.
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 |
Table 2: Slippage capacity (vertical surface)
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: Vertical assembly (sliding) - 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
|
Table 4: Steel thickness (saturation) - power losses
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: Thermal stability (stability) - 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
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 12.5x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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 |
| 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 |
Table 8: Impact energy (kinetic energy) - 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 |
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) |
Table 10: Construction 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) |
Table 11: Submerged application
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
*Note: On a vertical surface, the magnet holds just a fraction of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) significantly reduces the holding force.
3. Power loss vs temp
*For standard magnets, 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.
Elemental analysis
| 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 |
Check out also proposals
Pros and cons of neodymium magnets.
Pros
- Their power is maintained, and after around 10 years it decreases only by ~1% (according to research),
- They show high resistance to demagnetization induced by external disturbances,
- A magnet with a smooth silver surface has better aesthetics,
- They feature high magnetic induction at the operating surface, making them more effective,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
- Possibility of custom machining as well as optimizing to specific conditions,
- Versatile presence in innovative solutions – they are commonly used in data components, brushless drives, diagnostic systems, as well as complex engineering applications.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
- Neodymium magnets decrease their force 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- We suggest casing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated shapes.
- Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these magnets can complicate diagnosis medical when they are in the body.
- Due to expensive raw materials, their price exceeds standard values,
Lifting parameters
Maximum holding power of the magnet – what affects it?
- on a plate made of mild steel, perfectly concentrating the magnetic field
- with a thickness of at least 10 mm
- characterized by smoothness
- under conditions of gap-free contact (surface-to-surface)
- under axial application of breakaway force (90-degree angle)
- at standard ambient temperature
Key elements affecting lifting force
- Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Load vector – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
- Material composition – not every steel attracts identically. High carbon content weaken the attraction effect.
- Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
- Temperature – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.
Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.
Safety rules for work with NdFeB magnets
Phone sensors
GPS units and smartphones are highly susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.
Permanent damage
Do not overheat. NdFeB magnets are sensitive to heat. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).
Life threat
Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.
Material brittleness
NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets will cause them shattering into shards.
Crushing risk
Risk of injury: The pulling power is so great that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.
Safe distance
Do not bring magnets close to a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.
Fire risk
Fire hazard: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.
Nickel allergy
Studies show that nickel (standard magnet coating) is a common allergen. If you have an allergy, avoid direct skin contact or choose versions in plastic housing.
Conscious usage
Handle magnets with awareness. Their powerful strength can shock even experienced users. Be vigilant and do not underestimate their force.
Product not for children
Always keep magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are life-threatening.
