MW 12x3 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010018
GTIN/EAN: 5906301810179
Diameter Ø
12 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
2.54 g
Magnetization Direction
↑ axial
Load capacity
2.49 kg / 24.43 N
Magnetic Induction
277.09 mT / 2771 Gs
Coating
[NiCuNi] Nickel
1.648 ZŁ with VAT / pcs + price for transport
1.340 ZŁ net + 23% VAT / pcs
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Technical details - MW 12x3 / N38 - cylindrical magnet
Specification / characteristics - MW 12x3 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010018 |
| GTIN/EAN | 5906301810179 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 2.54 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.49 kg / 24.43 N |
| Magnetic Induction ~ ? | 277.09 mT / 2771 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 modeling of the assembly - report
These data represent the direct effect of a engineering analysis. Values were calculated on algorithms for the material Nd2Fe14B. Real-world performance may differ. Please consider these data as a supplementary guide during assembly planning.
Table 1: Static pull force (pull vs distance) - power drop
MW 12x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2770 Gs
277.0 mT
|
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
|
warning |
| 1 mm |
2420 Gs
242.0 mT
|
1.90 kg / 4.19 LBS
1900.6 g / 18.6 N
|
low risk |
| 2 mm |
2009 Gs
200.9 mT
|
1.31 kg / 2.89 LBS
1309.4 g / 12.8 N
|
low risk |
| 3 mm |
1611 Gs
161.1 mT
|
0.84 kg / 1.86 LBS
842.7 g / 8.3 N
|
low risk |
| 5 mm |
991 Gs
99.1 mT
|
0.32 kg / 0.70 LBS
318.7 g / 3.1 N
|
low risk |
| 10 mm |
313 Gs
31.3 mT
|
0.03 kg / 0.07 LBS
31.8 g / 0.3 N
|
low risk |
| 15 mm |
125 Gs
12.5 mT
|
0.01 kg / 0.01 LBS
5.1 g / 0.0 N
|
low risk |
| 20 mm |
61 Gs
6.1 mT
|
0.00 kg / 0.00 LBS
1.2 g / 0.0 N
|
low risk |
| 30 mm |
20 Gs
2.0 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
low risk |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Vertical capacity (wall)
MW 12x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.50 kg / 1.10 LBS
498.0 g / 4.9 N
|
| 1 mm | Stal (~0.2) |
0.38 kg / 0.84 LBS
380.0 g / 3.7 N
|
| 2 mm | Stal (~0.2) |
0.26 kg / 0.58 LBS
262.0 g / 2.6 N
|
| 3 mm | Stal (~0.2) |
0.17 kg / 0.37 LBS
168.0 g / 1.6 N
|
| 5 mm | Stal (~0.2) |
0.06 kg / 0.14 LBS
64.0 g / 0.6 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.01 LBS
6.0 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) - vertical pull
MW 12x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.75 kg / 1.65 LBS
747.0 g / 7.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.50 kg / 1.10 LBS
498.0 g / 4.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.25 kg / 0.55 LBS
249.0 g / 2.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.25 kg / 2.74 LBS
1245.0 g / 12.2 N
|
Table 4: Material efficiency (saturation) - power losses
MW 12x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.25 kg / 0.55 LBS
249.0 g / 2.4 N
|
| 1 mm |
|
0.62 kg / 1.37 LBS
622.5 g / 6.1 N
|
| 2 mm |
|
1.25 kg / 2.74 LBS
1245.0 g / 12.2 N
|
| 3 mm |
|
1.87 kg / 4.12 LBS
1867.5 g / 18.3 N
|
| 5 mm |
|
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
|
| 10 mm |
|
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
|
| 11 mm |
|
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
|
| 12 mm |
|
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
|
Table 5: Working in heat (material behavior) - thermal limit
MW 12x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
|
OK |
| 40 °C | -2.2% |
2.44 kg / 5.37 LBS
2435.2 g / 23.9 N
|
OK |
| 60 °C | -4.4% |
2.38 kg / 5.25 LBS
2380.4 g / 23.4 N
|
|
| 80 °C | -6.6% |
2.33 kg / 5.13 LBS
2325.7 g / 22.8 N
|
|
| 100 °C | -28.8% |
1.77 kg / 3.91 LBS
1772.9 g / 17.4 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 12x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
5.35 kg / 11.79 LBS
4 377 Gs
|
0.80 kg / 1.77 LBS
802 g / 7.9 N
|
N/A |
| 1 mm |
4.75 kg / 10.46 LBS
5 218 Gs
|
0.71 kg / 1.57 LBS
712 g / 7.0 N
|
4.27 kg / 9.42 LBS
~0 Gs
|
| 2 mm |
4.08 kg / 9.00 LBS
4 840 Gs
|
0.61 kg / 1.35 LBS
612 g / 6.0 N
|
3.67 kg / 8.10 LBS
~0 Gs
|
| 3 mm |
3.42 kg / 7.55 LBS
4 433 Gs
|
0.51 kg / 1.13 LBS
514 g / 5.0 N
|
3.08 kg / 6.80 LBS
~0 Gs
|
| 5 mm |
2.27 kg / 5.01 LBS
3 610 Gs
|
0.34 kg / 0.75 LBS
341 g / 3.3 N
|
2.04 kg / 4.51 LBS
~0 Gs
|
| 10 mm |
0.68 kg / 1.51 LBS
1 982 Gs
|
0.10 kg / 0.23 LBS
103 g / 1.0 N
|
0.62 kg / 1.36 LBS
~0 Gs
|
| 20 mm |
0.07 kg / 0.15 LBS
626 Gs
|
0.01 kg / 0.02 LBS
10 g / 0.1 N
|
0.06 kg / 0.14 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
67 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
41 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
27 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
18 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
13 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
10 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MW 12x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 3.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.5 cm |
| Remote | 50 Gs (5.0 mT) | 2.5 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 (kinetic energy) - warning
MW 12x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
31.83 km/h
(8.84 m/s)
|
0.10 J | |
| 30 mm |
54.69 km/h
(15.19 m/s)
|
0.29 J | |
| 50 mm |
70.61 km/h
(19.61 m/s)
|
0.49 J | |
| 100 mm |
99.85 km/h
(27.74 m/s)
|
0.98 J |
Table 9: Anti-corrosion coating durability
MW 12x3 / 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 (Pc)
MW 12x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 3 483 Mx | 34.8 µWb |
| Pc Coefficient | 0.35 | Low (Flat) |
Table 11: Physics of underwater searching
MW 12x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.49 kg | Standard |
| Water (riverbed) |
2.85 kg
(+0.36 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical wall, the magnet retains only a fraction of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.
3. Power loss vs temp
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.35
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% |
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 Nd2Fe14B magnets.
Strengths
- Their strength remains stable, and after approximately ten years it decreases only by ~1% (according to research),
- They maintain their magnetic properties even under strong external field,
- A magnet with a metallic silver surface has an effective appearance,
- They are known for high magnetic induction at the operating surface, which affects their effectiveness,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Thanks to versatility in forming and the ability to modify to complex applications,
- Wide application in advanced technology sectors – they are commonly used in hard drives, electric motors, medical equipment, and industrial machines.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Disadvantages
- To avoid cracks under impact, we suggest using special steel housings. Such a solution secures 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.
- Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Due to limitations in creating nuts and complex forms in magnets, we propose using casing - magnetic mechanism.
- Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities
Lifting parameters
Best holding force of the magnet in ideal parameters – what affects it?
- with the use of a sheet made of special test steel, ensuring full magnetic saturation
- possessing a massiveness of minimum 10 mm to avoid saturation
- with an ground touching surface
- with total lack of distance (without impurities)
- for force acting at a right angle (in the magnet axis)
- in stable room temperature
Determinants of practical lifting force of a magnet
- Gap (between the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
- Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Plate material – low-carbon steel attracts best. Alloy steels decrease magnetic properties and lifting capacity.
- Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
- Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity was determined by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate reduces the holding force.
Warnings
GPS Danger
Note: rare earth magnets produce a field that interferes with sensitive sensors. Keep a safe distance from your phone, device, and navigation systems.
Flammability
Powder produced during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.
Warning for heart patients
Warning for patients: Powerful magnets affect electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.
Heat sensitivity
Watch the temperature. Exposing the magnet to high heat will permanently weaken its properties and strength.
Magnetic media
Data protection: Strong magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).
Material brittleness
Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.
Choking Hazard
Only for adults. Small elements pose a choking risk, leading to severe trauma. Store away from children and animals.
Crushing risk
Danger of trauma: The attraction force is so immense that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
Nickel coating and allergies
Certain individuals suffer from a sensitization to Ni, which is the standard coating for neodymium magnets. Frequent touching might lead to a rash. We strongly advise use protective gloves.
Immense force
Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.
