MW 12x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010016
GTIN/EAN: 5906301810155
Diameter Ø
12 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
8.48 g
Magnetization Direction
↑ axial
Load capacity
4.83 kg / 47.41 N
Magnetic Induction
531.09 mT / 5311 Gs
Coating
[NiCuNi] Nickel
3.03 ZŁ with VAT / pcs + price for transport
2.46 ZŁ net + 23% VAT / pcs
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Product card - MW 12x10 / N38 - cylindrical magnet
Specification / characteristics - MW 12x10 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010016 |
| GTIN/EAN | 5906301810155 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 8.48 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 4.83 kg / 47.41 N |
| Magnetic Induction ~ ? | 531.09 mT / 5311 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 modeling of the product - data
The following information constitute the result of a mathematical simulation. Values rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ. Please consider these calculations as a supplementary guide for designers.
Table 1: Static pull force (pull vs distance) - power drop
MW 12x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5308 Gs
530.8 mT
|
4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
|
medium risk |
| 1 mm |
4424 Gs
442.4 mT
|
3.36 kg / 7.40 pounds
3355.3 g / 32.9 N
|
medium risk |
| 2 mm |
3585 Gs
358.5 mT
|
2.20 kg / 4.86 pounds
2203.4 g / 21.6 N
|
medium risk |
| 3 mm |
2857 Gs
285.7 mT
|
1.40 kg / 3.08 pounds
1399.2 g / 13.7 N
|
weak grip |
| 5 mm |
1787 Gs
178.7 mT
|
0.55 kg / 1.21 pounds
547.8 g / 5.4 N
|
weak grip |
| 10 mm |
622 Gs
62.2 mT
|
0.07 kg / 0.15 pounds
66.3 g / 0.7 N
|
weak grip |
| 15 mm |
272 Gs
27.2 mT
|
0.01 kg / 0.03 pounds
12.7 g / 0.1 N
|
weak grip |
| 20 mm |
141 Gs
14.1 mT
|
0.00 kg / 0.01 pounds
3.4 g / 0.0 N
|
weak grip |
| 30 mm |
52 Gs
5.2 mT
|
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
|
weak grip |
| 50 mm |
13 Gs
1.3 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Sliding capacity (wall)
MW 12x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.97 kg / 2.13 pounds
966.0 g / 9.5 N
|
| 1 mm | Stal (~0.2) |
0.67 kg / 1.48 pounds
672.0 g / 6.6 N
|
| 2 mm | Stal (~0.2) |
0.44 kg / 0.97 pounds
440.0 g / 4.3 N
|
| 3 mm | Stal (~0.2) |
0.28 kg / 0.62 pounds
280.0 g / 2.7 N
|
| 5 mm | Stal (~0.2) |
0.11 kg / 0.24 pounds
110.0 g / 1.1 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
14.0 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 12x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.45 kg / 3.19 pounds
1449.0 g / 14.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.97 kg / 2.13 pounds
966.0 g / 9.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.48 kg / 1.06 pounds
483.0 g / 4.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.42 kg / 5.32 pounds
2415.0 g / 23.7 N
|
Table 4: Steel thickness (saturation) - power losses
MW 12x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.48 kg / 1.06 pounds
483.0 g / 4.7 N
|
| 1 mm |
|
1.21 kg / 2.66 pounds
1207.5 g / 11.8 N
|
| 2 mm |
|
2.42 kg / 5.32 pounds
2415.0 g / 23.7 N
|
| 3 mm |
|
3.62 kg / 7.99 pounds
3622.5 g / 35.5 N
|
| 5 mm |
|
4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
|
| 10 mm |
|
4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
|
| 11 mm |
|
4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
|
| 12 mm |
|
4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
|
Table 5: Working in heat (stability) - thermal limit
MW 12x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.83 kg / 10.65 pounds
4830.0 g / 47.4 N
|
OK |
| 40 °C | -2.2% |
4.72 kg / 10.41 pounds
4723.7 g / 46.3 N
|
OK |
| 60 °C | -4.4% |
4.62 kg / 10.18 pounds
4617.5 g / 45.3 N
|
OK |
| 80 °C | -6.6% |
4.51 kg / 9.95 pounds
4511.2 g / 44.3 N
|
|
| 100 °C | -28.8% |
3.44 kg / 7.58 pounds
3439.0 g / 33.7 N
|
Table 6: Two magnets (attraction) - forces in the system
MW 12x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
19.64 kg / 43.30 pounds
5 928 Gs
|
2.95 kg / 6.50 pounds
2946 g / 28.9 N
|
N/A |
| 1 mm |
16.52 kg / 36.43 pounds
9 736 Gs
|
2.48 kg / 5.46 pounds
2479 g / 24.3 N
|
14.87 kg / 32.79 pounds
~0 Gs
|
| 2 mm |
13.64 kg / 30.08 pounds
8 847 Gs
|
2.05 kg / 4.51 pounds
2047 g / 20.1 N
|
12.28 kg / 27.07 pounds
~0 Gs
|
| 3 mm |
11.12 kg / 24.51 pounds
7 986 Gs
|
1.67 kg / 3.68 pounds
1668 g / 16.4 N
|
10.01 kg / 22.06 pounds
~0 Gs
|
| 5 mm |
7.16 kg / 15.79 pounds
6 410 Gs
|
1.07 kg / 2.37 pounds
1074 g / 10.5 N
|
6.45 kg / 14.21 pounds
~0 Gs
|
| 10 mm |
2.23 kg / 4.91 pounds
3 575 Gs
|
0.33 kg / 0.74 pounds
334 g / 3.3 N
|
2.00 kg / 4.42 pounds
~0 Gs
|
| 20 mm |
0.27 kg / 0.59 pounds
1 244 Gs
|
0.04 kg / 0.09 pounds
40 g / 0.4 N
|
0.24 kg / 0.54 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.01 pounds
164 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
104 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
70 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
49 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
36 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
27 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 12x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 7.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 6.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.5 cm |
| Remote | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Collisions (kinetic energy) - warning
MW 12x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
24.27 km/h
(6.74 m/s)
|
0.19 J | |
| 30 mm |
41.69 km/h
(11.58 m/s)
|
0.57 J | |
| 50 mm |
53.82 km/h
(14.95 m/s)
|
0.95 J | |
| 100 mm |
76.11 km/h
(21.14 m/s)
|
1.90 J |
Table 9: Surface protection spec
MW 12x10 / 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 12x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 6 105 Mx | 61.1 µWb |
| Pc Coefficient | 0.81 | High (Stable) |
Table 11: Physics of underwater searching
MW 12x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 4.83 kg | Standard |
| Water (riverbed) |
5.53 kg
(+0.70 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical wall, the magnet retains merely ~20% of its max power.
2. Steel thickness impact
*Thin steel (e.g. computer case) severely limits the holding force.
3. Temperature resistance
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.81
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros and cons of Nd2Fe14B magnets.
Advantages
- Their magnetic field is durable, and after around 10 years it decreases only by ~1% (according to research),
- They do not lose their magnetic properties even under close interference source,
- By using a decorative coating of silver, the element presents an nice look,
- They feature high magnetic induction at the operating surface, which affects their effectiveness,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
- Possibility of custom machining as well as adapting to defined conditions,
- Huge importance in high-tech industry – they find application in magnetic memories, brushless drives, medical devices, as well as complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in small systems
Limitations
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
- When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- Due to limitations in creating threads and complicated shapes in magnets, we recommend using cover - magnetic mount.
- Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these devices can be problematic in diagnostics medical in case of swallowing.
- With large orders the cost of neodymium magnets can be a barrier,
Pull force analysis
Highest magnetic holding force – what affects it?
- on a plate made of mild steel, optimally conducting the magnetic field
- whose transverse dimension equals approx. 10 mm
- with a surface cleaned and smooth
- with total lack of distance (no paint)
- for force acting at a right angle (in the magnet axis)
- at temperature room level
Lifting capacity in real conditions – factors
- Gap between magnet and steel – 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 holding force drops significantly, often to levels of 20-30% of the nominal value.
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
- Material type – the best choice is pure iron steel. Cast iron may attract less.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
- Thermal environment – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.
Lifting capacity was determined by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet and the plate reduces the lifting capacity.
Safe handling of neodymium magnets
Handling guide
Use magnets with awareness. Their immense force can surprise even professionals. Be vigilant and respect their force.
Warning for heart patients
People with a heart stimulator must keep an safe separation from magnets. The magnetic field can stop the operation of the life-saving device.
Bodily injuries
Pinching hazard: The pulling power is so immense that it can cause hematomas, pinching, and broken bones. Use thick gloves.
Cards and drives
Powerful magnetic fields can erase data on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.
Compass and GPS
Remember: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a safe distance from your mobile, tablet, and GPS.
Warning for allergy sufferers
It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid direct skin contact and choose encased magnets.
Machining danger
Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.
No play value
Adult use only. Small elements can be swallowed, leading to serious injuries. Keep out of reach of kids and pets.
Maximum temperature
Avoid heat. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, look for HT versions (H, SH, UH).
Material brittleness
Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Eye protection is mandatory.
