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
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 | 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 magnet - report
These values represent the outcome of a physical calculation. Results rely on models for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Use these data as a reference point for designers.
Table 1: Static pull 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 pounds
1420.0 g / 13.9 N
|
weak grip |
| 1 mm |
1703 Gs
170.3 mT
|
1.16 kg / 2.55 pounds
1155.6 g / 11.3 N
|
weak grip |
| 2 mm |
1453 Gs
145.3 mT
|
0.84 kg / 1.85 pounds
840.3 g / 8.2 N
|
weak grip |
| 3 mm |
1190 Gs
119.0 mT
|
0.56 kg / 1.24 pounds
564.1 g / 5.5 N
|
weak grip |
| 5 mm |
752 Gs
75.2 mT
|
0.23 kg / 0.50 pounds
225.0 g / 2.2 N
|
weak grip |
| 10 mm |
241 Gs
24.1 mT
|
0.02 kg / 0.05 pounds
23.2 g / 0.2 N
|
weak grip |
| 15 mm |
96 Gs
9.6 mT
|
0.00 kg / 0.01 pounds
3.7 g / 0.0 N
|
weak grip |
| 20 mm |
46 Gs
4.6 mT
|
0.00 kg / 0.00 pounds
0.9 g / 0.0 N
|
weak grip |
| 30 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
weak grip |
| 50 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage 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 pounds
284.0 g / 2.8 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 0.51 pounds
232.0 g / 2.3 N
|
| 2 mm | Stal (~0.2) |
0.17 kg / 0.37 pounds
168.0 g / 1.6 N
|
| 3 mm | Stal (~0.2) |
0.11 kg / 0.25 pounds
112.0 g / 1.1 N
|
| 5 mm | Stal (~0.2) |
0.05 kg / 0.10 pounds
46.0 g / 0.5 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Wall mounting (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 pounds
426.0 g / 4.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.28 kg / 0.63 pounds
284.0 g / 2.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.14 kg / 0.31 pounds
142.0 g / 1.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.71 kg / 1.57 pounds
710.0 g / 7.0 N
|
Table 4: Steel thickness (saturation) - 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 pounds
142.0 g / 1.4 N
|
| 1 mm |
|
0.36 kg / 0.78 pounds
355.0 g / 3.5 N
|
| 2 mm |
|
0.71 kg / 1.57 pounds
710.0 g / 7.0 N
|
| 3 mm |
|
1.07 kg / 2.35 pounds
1065.0 g / 10.4 N
|
| 5 mm |
|
1.42 kg / 3.13 pounds
1420.0 g / 13.9 N
|
| 10 mm |
|
1.42 kg / 3.13 pounds
1420.0 g / 13.9 N
|
| 11 mm |
|
1.42 kg / 3.13 pounds
1420.0 g / 13.9 N
|
| 12 mm |
|
1.42 kg / 3.13 pounds
1420.0 g / 13.9 N
|
Table 5: Working in heat (material behavior) - 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 pounds
1420.0 g / 13.9 N
|
OK |
| 40 °C | -2.2% |
1.39 kg / 3.06 pounds
1388.8 g / 13.6 N
|
OK |
| 60 °C | -4.4% |
1.36 kg / 2.99 pounds
1357.5 g / 13.3 N
|
|
| 80 °C | -6.6% |
1.33 kg / 2.92 pounds
1326.3 g / 13.0 N
|
|
| 100 °C | -28.8% |
1.01 kg / 2.23 pounds
1011.0 g / 9.9 N
|
Table 6: Two magnets (repulsion) - field collision
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 pounds
3 338 Gs
|
0.40 kg / 0.89 pounds
405 g / 4.0 N
|
N/A |
| 1 mm |
2.47 kg / 5.45 pounds
3 616 Gs
|
0.37 kg / 0.82 pounds
371 g / 3.6 N
|
2.23 kg / 4.91 pounds
~0 Gs
|
| 2 mm |
2.20 kg / 4.84 pounds
3 407 Gs
|
0.33 kg / 0.73 pounds
329 g / 3.2 N
|
1.98 kg / 4.36 pounds
~0 Gs
|
| 3 mm |
1.89 kg / 4.18 pounds
3 165 Gs
|
0.28 kg / 0.63 pounds
284 g / 2.8 N
|
1.71 kg / 3.76 pounds
~0 Gs
|
| 5 mm |
1.32 kg / 2.91 pounds
2 640 Gs
|
0.20 kg / 0.44 pounds
198 g / 1.9 N
|
1.19 kg / 2.62 pounds
~0 Gs
|
| 10 mm |
0.43 kg / 0.94 pounds
1 503 Gs
|
0.06 kg / 0.14 pounds
64 g / 0.6 N
|
0.38 kg / 0.85 pounds
~0 Gs
|
| 20 mm |
0.04 kg / 0.10 pounds
483 Gs
|
0.01 kg / 0.01 pounds
7 g / 0.1 N
|
0.04 kg / 0.09 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
51 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
31 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
20 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
14 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
10 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
7 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (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 |
| Timepiece | 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 |
Table 8: Dynamics (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: Coating parameters (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. Vertical hold
*Caution: On a vertical surface, the magnet retains merely a fraction of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.
3. Heat tolerance
*For N38 grade, the critical limit 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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Pros and cons of neodymium magnets.
Benefits
- Their strength is durable, and after approximately 10 years it drops only by ~1% (theoretically),
- They are extremely resistant to demagnetization induced by external field influence,
- By covering with a lustrous coating of gold, the element has an proper look,
- Magnetic induction on the working part of the magnet turns out to be exceptional,
- 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...
- Thanks to the ability of precise molding and adaptation to unique requirements, neodymium magnets can be created in a wide range of geometric configurations, which increases their versatility,
- Versatile presence in modern industrial fields – they are utilized in hard drives, electric drive systems, advanced medical instruments, as well as other advanced devices.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Weaknesses
- To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
- We warn that neodymium magnets can lose their power 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 recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
- We suggest cover - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex shapes.
- Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Maximum lifting capacity of the magnet – what affects it?
- with the application of a yoke made of special test steel, guaranteeing maximum field concentration
- whose transverse dimension is min. 10 mm
- with an polished touching surface
- without any insulating layer between the magnet and steel
- for force applied at a right angle (in the magnet axis)
- at temperature room level
Impact of factors on magnetic holding capacity in practice
- Clearance – existence of foreign body (rust, dirt, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Direction of force – maximum parameter is reached only during perpendicular pulling. The shear force of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Steel type – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and holding force.
- Surface finish – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
- Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).
Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the lifting capacity.
H&S for magnets
Magnet fragility
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.
Bodily injuries
Mind your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!
Combustion hazard
Dust generated during grinding of magnets is self-igniting. Do not drill into magnets unless you are an expert.
Sensitization to coating
Medical facts indicate that nickel (standard magnet coating) is a common allergen. For allergy sufferers, refrain from touching magnets with bare hands or choose versions in plastic housing.
ICD Warning
Patients with a ICD should keep an safe separation from magnets. The magnetic field can interfere with the operation of the life-saving device.
Electronic hazard
Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.
Adults only
Absolutely keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets connecting inside the body are life-threatening.
Precision electronics
Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.
Operating temperature
Control the heat. Exposing the magnet to high heat will permanently weaken its magnetic structure and pulling force.
Handling guide
Handle with care. Rare earth magnets act from a distance and connect with massive power, often faster than you can react.
