MW 12x8 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010022
GTIN/EAN: 5906301810216
Diameter Ø
12 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
6.79 g
Magnetization Direction
↑ axial
Load capacity
4.93 kg / 48.32 N
Magnetic Induction
495.50 mT / 4955 Gs
Coating
[NiCuNi] Nickel
2.47 ZŁ with VAT / pcs + price for transport
2.01 ZŁ net + 23% VAT / pcs
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Physical properties - MW 12x8 / N38 - cylindrical magnet
Specification / characteristics - MW 12x8 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010022 |
| GTIN/EAN | 5906301810216 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±0,1 mm] |
| Height | 8 mm [±0,1 mm] |
| Weight | 6.79 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 4.93 kg / 48.32 N |
| Magnetic Induction ~ ? | 495.50 mT / 4955 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 simulation of the assembly - technical parameters
These information constitute the outcome of a physical calculation. Results were calculated on models for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Treat these data as a supplementary guide when designing systems.
Table 1: Static pull force (force vs distance) - power drop
MW 12x8 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4952 Gs
495.2 mT
|
4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
|
warning |
| 1 mm |
4139 Gs
413.9 mT
|
3.44 kg / 7.59 lbs
3445.0 g / 33.8 N
|
warning |
| 2 mm |
3356 Gs
335.6 mT
|
2.26 kg / 4.99 lbs
2264.2 g / 22.2 N
|
warning |
| 3 mm |
2670 Gs
267.0 mT
|
1.43 kg / 3.16 lbs
1433.5 g / 14.1 N
|
low risk |
| 5 mm |
1660 Gs
166.0 mT
|
0.55 kg / 1.22 lbs
554.1 g / 5.4 N
|
low risk |
| 10 mm |
565 Gs
56.5 mT
|
0.06 kg / 0.14 lbs
64.3 g / 0.6 N
|
low risk |
| 15 mm |
243 Gs
24.3 mT
|
0.01 kg / 0.03 lbs
11.8 g / 0.1 N
|
low risk |
| 20 mm |
124 Gs
12.4 mT
|
0.00 kg / 0.01 lbs
3.1 g / 0.0 N
|
low risk |
| 30 mm |
45 Gs
4.5 mT
|
0.00 kg / 0.00 lbs
0.4 g / 0.0 N
|
low risk |
| 50 mm |
11 Gs
1.1 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
Table 2: Slippage capacity (vertical surface)
MW 12x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.99 kg / 2.17 lbs
986.0 g / 9.7 N
|
| 1 mm | Stal (~0.2) |
0.69 kg / 1.52 lbs
688.0 g / 6.7 N
|
| 2 mm | Stal (~0.2) |
0.45 kg / 1.00 lbs
452.0 g / 4.4 N
|
| 3 mm | Stal (~0.2) |
0.29 kg / 0.63 lbs
286.0 g / 2.8 N
|
| 5 mm | Stal (~0.2) |
0.11 kg / 0.24 lbs
110.0 g / 1.1 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
12.0 g / 0.1 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 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 (shearing) - behavior on slippery surfaces
MW 12x8 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.48 kg / 3.26 lbs
1479.0 g / 14.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.99 kg / 2.17 lbs
986.0 g / 9.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.49 kg / 1.09 lbs
493.0 g / 4.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.47 kg / 5.43 lbs
2465.0 g / 24.2 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 12x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.49 kg / 1.09 lbs
493.0 g / 4.8 N
|
| 1 mm |
|
1.23 kg / 2.72 lbs
1232.5 g / 12.1 N
|
| 2 mm |
|
2.47 kg / 5.43 lbs
2465.0 g / 24.2 N
|
| 3 mm |
|
3.70 kg / 8.15 lbs
3697.5 g / 36.3 N
|
| 5 mm |
|
4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
|
| 10 mm |
|
4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
|
| 11 mm |
|
4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
|
| 12 mm |
|
4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
|
Table 5: Thermal resistance (material behavior) - power drop
MW 12x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.93 kg / 10.87 lbs
4930.0 g / 48.4 N
|
OK |
| 40 °C | -2.2% |
4.82 kg / 10.63 lbs
4821.5 g / 47.3 N
|
OK |
| 60 °C | -4.4% |
4.71 kg / 10.39 lbs
4713.1 g / 46.2 N
|
OK |
| 80 °C | -6.6% |
4.60 kg / 10.15 lbs
4604.6 g / 45.2 N
|
|
| 100 °C | -28.8% |
3.51 kg / 7.74 lbs
3510.2 g / 34.4 N
|
Table 6: Two magnets (repulsion) - field collision
MW 12x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
17.10 kg / 37.69 lbs
5 795 Gs
|
2.56 kg / 5.65 lbs
2565 g / 25.2 N
|
N/A |
| 1 mm |
14.44 kg / 31.83 lbs
9 101 Gs
|
2.17 kg / 4.77 lbs
2166 g / 21.2 N
|
12.99 kg / 28.64 lbs
~0 Gs
|
| 2 mm |
11.95 kg / 26.34 lbs
8 279 Gs
|
1.79 kg / 3.95 lbs
1792 g / 17.6 N
|
10.75 kg / 23.71 lbs
~0 Gs
|
| 3 mm |
9.74 kg / 21.48 lbs
7 477 Gs
|
1.46 kg / 3.22 lbs
1462 g / 14.3 N
|
8.77 kg / 19.33 lbs
~0 Gs
|
| 5 mm |
6.27 kg / 13.82 lbs
5 997 Gs
|
0.94 kg / 2.07 lbs
940 g / 9.2 N
|
5.64 kg / 12.44 lbs
~0 Gs
|
| 10 mm |
1.92 kg / 4.24 lbs
3 320 Gs
|
0.29 kg / 0.64 lbs
288 g / 2.8 N
|
1.73 kg / 3.81 lbs
~0 Gs
|
| 20 mm |
0.22 kg / 0.49 lbs
1 131 Gs
|
0.03 kg / 0.07 lbs
33 g / 0.3 N
|
0.20 kg / 0.44 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 lbs
142 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
89 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
59 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
41 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
30 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
23 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MW 12x8 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 7.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.5 cm |
| Car key | 50 Gs (5.0 mT) | 3.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (cracking risk) - collision effects
MW 12x8 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
27.40 km/h
(7.61 m/s)
|
0.20 J | |
| 30 mm |
47.07 km/h
(13.08 m/s)
|
0.58 J | |
| 50 mm |
60.77 km/h
(16.88 m/s)
|
0.97 J | |
| 100 mm |
85.94 km/h
(23.87 m/s)
|
1.93 J |
Table 9: Surface protection spec
MW 12x8 / 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 12x8 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 650 Mx | 56.5 µWb |
| Pc Coefficient | 0.71 | High (Stable) |
Table 11: Submerged application
MW 12x8 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 4.93 kg | Standard |
| Water (riverbed) |
5.64 kg
(+0.71 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Caution: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.
3. Thermal stability
*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) = 0.71
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.
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 proposals
Strengths and weaknesses of rare earth magnets.
Benefits
- They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (according to literature),
- Magnets perfectly resist against demagnetization caused by foreign field sources,
- The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
- Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
- Due to the option of precise molding and customization to unique projects, NdFeB magnets can be produced in a variety of shapes and sizes, which expands the range of possible applications,
- Versatile presence in modern technologies – they are commonly used in mass storage devices, brushless drives, advanced medical instruments, and technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in miniature devices
Cons
- Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
- We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
- Possible danger to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical after entering the body.
- Due to expensive raw materials, their price is relatively high,
Lifting parameters
Magnetic strength at its maximum – what contributes to it?
- with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
- with a thickness no less than 10 mm
- with an polished contact surface
- with zero gap (no impurities)
- under vertical force direction (90-degree angle)
- in stable room temperature
Practical lifting capacity: influencing factors
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
- Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Plate material – low-carbon steel gives the best results. Alloy steels lower magnetic permeability and holding force.
- Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
- Temperature influence – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet and the plate decreases the holding force.
Safe handling of neodymium magnets
Machining danger
Fire hazard: Rare earth powder is explosive. Avoid machining magnets in home conditions as this may cause fire.
Serious injuries
Large magnets can break fingers in a fraction of a second. Under no circumstances put your hand between two strong magnets.
Do not underestimate power
Before starting, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.
Material brittleness
Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Medical interference
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.
Impact on smartphones
Note: rare earth magnets generate a field that confuses sensitive sensors. Keep a safe distance from your mobile, tablet, and GPS.
Do not give to children
Adult use only. Small elements can be swallowed, leading to intestinal necrosis. Store out of reach of children and animals.
Power loss in heat
Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.
Data carriers
Powerful magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.
Nickel coating and allergies
A percentage of the population have a hypersensitivity to nickel, which is the common plating for neodymium magnets. Extended handling may cause dermatitis. We recommend wear safety gloves.
