MW 12x50 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010020
GTIN/EAN: 5906301810193
- Diameter Ø
- 12 mm [±0,1 mm]
- Height
- 50 mm [±0,1 mm]
- Weight
- 42.41 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
23.00 zł net / pcs
28.29 zł with VAT (23% VAT) / pcs
bulk discounts:
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 - MW 12x50 / N38 - cylindrical magnet
Specification / characteristics - MW 12x50 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010020 |
| GTIN/EAN | 5906301810193 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±0,1 mm] |
| Height | 50 mm [±0,1 mm] |
| Weight | 42.41 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.62 kg / 25.73 N |
| Magnetic Induction ~ ? | 614.94 mT / 6149 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 |
Physical analysis of the assembly - report
These information constitute the result of a mathematical calculation. Values rely on models for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these data as a reference point for designers.
Table 1: Static pull force (pull vs gap) - power drop
MW 12x50 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6146 Gs
614.6 mT
|
2.62 kg / 5.78 pounds
2620.0 g / 25.7 N
|
warning |
| 1 mm |
5138 Gs
513.8 mT
|
1.83 kg / 4.04 pounds
1831.5 g / 18.0 N
|
weak grip |
| 2 mm |
4199 Gs
419.9 mT
|
1.22 kg / 2.70 pounds
1222.9 g / 12.0 N
|
weak grip |
| 3 mm |
3388 Gs
338.8 mT
|
0.80 kg / 1.76 pounds
796.3 g / 7.8 N
|
weak grip |
| 5 mm |
2194 Gs
219.4 mT
|
0.33 kg / 0.74 pounds
334.0 g / 3.3 N
|
weak grip |
| 10 mm |
853 Gs
85.3 mT
|
0.05 kg / 0.11 pounds
50.4 g / 0.5 N
|
weak grip |
| 15 mm |
417 Gs
41.7 mT
|
0.01 kg / 0.03 pounds
12.1 g / 0.1 N
|
weak grip |
| 20 mm |
239 Gs
23.9 mT
|
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
weak grip |
| 30 mm |
103 Gs
10.3 mT
|
0.00 kg / 0.00 pounds
0.7 g / 0.0 N
|
weak grip |
| 50 mm |
33 Gs
3.3 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
weak grip |
Table 2: Slippage hold (wall)
MW 12x50 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.52 kg / 1.16 pounds
524.0 g / 5.1 N
|
| 1 mm | Stal (~0.2) |
0.37 kg / 0.81 pounds
366.0 g / 3.6 N
|
| 2 mm | Stal (~0.2) |
0.24 kg / 0.54 pounds
244.0 g / 2.4 N
|
| 3 mm | Stal (~0.2) |
0.16 kg / 0.35 pounds
160.0 g / 1.6 N
|
| 5 mm | Stal (~0.2) |
0.07 kg / 0.15 pounds
66.0 g / 0.6 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
10.0 g / 0.1 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 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) - vertical pull
MW 12x50 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.79 kg / 1.73 pounds
786.0 g / 7.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.52 kg / 1.16 pounds
524.0 g / 5.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.26 kg / 0.58 pounds
262.0 g / 2.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.31 kg / 2.89 pounds
1310.0 g / 12.9 N
|
Table 4: Material efficiency (saturation) - power losses
MW 12x50 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.26 kg / 0.58 pounds
262.0 g / 2.6 N
|
| 1 mm |
|
0.66 kg / 1.44 pounds
655.0 g / 6.4 N
|
| 2 mm |
|
1.31 kg / 2.89 pounds
1310.0 g / 12.9 N
|
| 3 mm |
|
1.97 kg / 4.33 pounds
1965.0 g / 19.3 N
|
| 5 mm |
|
2.62 kg / 5.78 pounds
2620.0 g / 25.7 N
|
| 10 mm |
|
2.62 kg / 5.78 pounds
2620.0 g / 25.7 N
|
| 11 mm |
|
2.62 kg / 5.78 pounds
2620.0 g / 25.7 N
|
| 12 mm |
|
2.62 kg / 5.78 pounds
2620.0 g / 25.7 N
|
Table 5: Thermal stability (material behavior) - thermal limit
MW 12x50 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.62 kg / 5.78 pounds
2620.0 g / 25.7 N
|
OK |
| 40 °C | -2.2% |
2.56 kg / 5.65 pounds
2562.4 g / 25.1 N
|
OK |
| 60 °C | -4.4% |
2.50 kg / 5.52 pounds
2504.7 g / 24.6 N
|
OK |
| 80 °C | -6.6% |
2.45 kg / 5.39 pounds
2447.1 g / 24.0 N
|
|
| 100 °C | -28.8% |
1.87 kg / 4.11 pounds
1865.4 g / 18.3 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MW 12x50 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
26.33 kg / 58.05 pounds
6 179 Gs
|
3.95 kg / 8.71 pounds
3950 g / 38.7 N
|
N/A |
| 1 mm |
22.19 kg / 48.93 pounds
11 284 Gs
|
3.33 kg / 7.34 pounds
3329 g / 32.7 N
|
19.97 kg / 44.04 pounds
~0 Gs
|
| 2 mm |
18.41 kg / 40.58 pounds
10 277 Gs
|
2.76 kg / 6.09 pounds
2761 g / 27.1 N
|
16.57 kg / 36.53 pounds
~0 Gs
|
| 3 mm |
15.11 kg / 33.30 pounds
9 309 Gs
|
2.27 kg / 5.00 pounds
2266 g / 22.2 N
|
13.60 kg / 29.97 pounds
~0 Gs
|
| 5 mm |
9.94 kg / 21.91 pounds
7 551 Gs
|
1.49 kg / 3.29 pounds
1491 g / 14.6 N
|
8.94 kg / 19.72 pounds
~0 Gs
|
| 10 mm |
3.36 kg / 7.40 pounds
4 389 Gs
|
0.50 kg / 1.11 pounds
504 g / 4.9 N
|
3.02 kg / 6.66 pounds
~0 Gs
|
| 20 mm |
0.51 kg / 1.12 pounds
1 706 Gs
|
0.08 kg / 0.17 pounds
76 g / 0.7 N
|
0.46 kg / 1.01 pounds
~0 Gs
|
| 50 mm |
0.02 kg / 0.04 pounds
303 Gs
|
0.00 kg / 0.01 pounds
2 g / 0.0 N
|
0.01 kg / 0.03 pounds
~0 Gs
|
| 60 mm |
0.01 kg / 0.02 pounds
206 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.01 pounds
148 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
110 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
84 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
66 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MW 12x50 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 11.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 8.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 6.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 5.0 cm |
| Remote | 50 Gs (5.0 mT) | 4.5 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MW 12x50 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
6.25 km/h
(1.73 m/s)
|
0.06 J | |
| 30 mm |
6.33 km/h
(1.76 m/s)
|
0.07 J | |
| 50 mm |
6.34 km/h
(1.76 m/s)
|
0.07 J | |
| 100 mm |
6.34 km/h
(1.76 m/s)
|
0.07 J |
Table 9: Surface protection spec
MW 12x50 / 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 (Flux)
MW 12x50 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 8 230 Mx | 82.3 µWb |
| Pc Coefficient | 1.49 | High (Stable) |
Table 11: Submerged application
MW 12x50 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.62 kg | Standard |
| Water (riverbed) |
3.00 kg
(+0.38 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical surface, the magnet retains just approx. 20-30% of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely weakens the holding force.
3. Heat tolerance
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.49
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Strengths as well as weaknesses of neodymium magnets.
Pros
- They do not lose power, even during around 10 years – the decrease in power is only ~1% (based on measurements),
- They are noted for resistance to demagnetization induced by presence of other magnetic fields,
- By covering with a decorative coating of nickel, the element presents an aesthetic look,
- Neodymium magnets create maximum magnetic induction on a small surface, which allows for strong attraction,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Due to the possibility of precise shaping and adaptation to individualized needs, neodymium magnets can be manufactured in a broad palette of forms and dimensions, which increases their versatility,
- Huge importance in modern technologies – they are commonly used in computer drives, electric drive systems, diagnostic systems, also multitasking production systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Weaknesses
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
- We suggest casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated forms.
- Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Best holding force of the magnet in ideal parameters – what it depends on?
- using a sheet made of high-permeability steel, acting as a magnetic yoke
- whose transverse dimension is min. 10 mm
- with an ideally smooth contact surface
- with total lack of distance (no coatings)
- under axial force vector (90-degree angle)
- at room temperature
Lifting capacity in practice – influencing factors
- Air gap (between the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
- Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of nominal force).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content reduce magnetic permeability and lifting capacity.
- Surface condition – ground elements ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
- Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).
Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet and the plate lowers the lifting capacity.
Safety rules for work with NdFeB magnets
Impact on smartphones
GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.
Protect data
Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).
Avoid contact if allergic
Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, immediately stop handling magnets and wear gloves.
Respect the power
Handle magnets with awareness. Their immense force can shock even professionals. Be vigilant and do not underestimate their force.
Crushing force
Watch your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!
Heat warning
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.
Protective goggles
Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. We recommend safety glasses.
Danger to pacemakers
People with a ICD should maintain an large gap from magnets. The magnetic field can stop the operation of the life-saving device.
Combustion hazard
Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.
Danger to the youngest
NdFeB magnets are not suitable for play. Swallowing multiple magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.
