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
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Technical specification - 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 |
Engineering analysis of the assembly - data
Presented data represent the outcome of a physical simulation. Values are based on models for the material Nd2Fe14B. Real-world conditions may differ. Please consider these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (pull 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
|
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: 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
|
Table 3: Vertical assembly (shearing) - 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: Thermal resistance (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 (repulsion) - field range
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
|
Table 7: Safety (HSE) (implants) - 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 |
| Mechanical watch | 20 Gs (2.0 mT) | 3.0 cm |
| Mobile device | 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 |
Table 8: Collisions (cracking risk) - 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 |
Table 9: Anti-corrosion coating durability
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: 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. Sliding resistance
*Warning: On a vertical surface, the magnet holds just a fraction of its max power.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Heat tolerance
*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.
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 |
Other offers
Pros as well as cons of neodymium magnets.
Advantages
- They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (in testing),
- They show high resistance to demagnetization induced by presence of other magnetic fields,
- Thanks to the glossy finish, the plating of nickel, gold-plated, or silver-plated gives an aesthetic appearance,
- Magnetic induction on the working layer of the magnet turns out to be maximum,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Thanks to flexibility in shaping and the ability to customize to individual projects,
- Versatile presence in advanced technology sectors – they are used in magnetic memories, electromotive mechanisms, medical equipment, and other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which enables their usage in compact constructions
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- We recommend a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated forms.
- Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
- With mass production the cost of neodymium magnets is economically unviable,
Lifting parameters
Magnetic strength at its maximum – what affects it?
- with the application of a sheet made of low-carbon steel, guaranteeing maximum field concentration
- whose transverse dimension is min. 10 mm
- characterized by smoothness
- under conditions of no distance (surface-to-surface)
- for force applied at a right angle (in the magnet axis)
- at temperature room level
Determinants of practical lifting force of a magnet
- Distance – the presence of foreign body (rust, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Metal type – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
- Surface structure – the more even the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet and the plate lowers the lifting capacity.
Safety rules for work with NdFeB magnets
Fragile material
Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting shards into the air. Wear goggles.
Life threat
Patients with a ICD should keep an safe separation from magnets. The magnetic field can stop the operation of the life-saving device.
Allergic reactions
Certain individuals suffer from a contact allergy to Ni, which is the standard coating for neodymium magnets. Extended handling can result in a rash. We recommend wear safety gloves.
Compass and GPS
Navigation devices and smartphones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.
Conscious usage
Before use, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.
No play value
Adult use only. Small elements can be swallowed, causing severe trauma. Store away from kids and pets.
Pinching danger
Mind your fingers. Two large magnets will join instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!
Keep away from computers
Do not bring magnets close to a wallet, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.
Dust explosion hazard
Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.
Maximum temperature
Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.
