MW 12x4 / N52 - cylindrical magnet
cylindrical magnet
Catalog no 010500
GTIN/EAN: 5906301814962
Diameter Ø
12 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
3.39 g
Magnetization Direction
↑ axial
Load capacity
4.68 kg / 45.89 N
Magnetic Induction
400.45 mT / 4005 Gs
Coating
[NiCuNi] Nickel
2.18 ZŁ with VAT / pcs + price for transport
1.770 ZŁ net + 23% VAT / pcs
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Physical properties - MW 12x4 / N52 - cylindrical magnet
Specification / characteristics - MW 12x4 / N52 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010500 |
| GTIN/EAN | 5906301814962 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 12 mm [±0,1 mm] |
| Height | 4 mm [±0,1 mm] |
| Weight | 3.39 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 4.68 kg / 45.89 N |
| Magnetic Induction ~ ? | 400.45 mT / 4005 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N52
| properties | values | units |
|---|---|---|
| remenance Br [min. - max.] ? | 14.2-14.7 | kGs |
| remenance Br [min. - max.] ? | 1420-1470 | mT |
| coercivity bHc ? | 10.8-12.5 | kOe |
| coercivity bHc ? | 860-995 | kA/m |
| actual internal force iHc | ≥ 12 | kOe |
| actual internal force iHc | ≥ 955 | kA/m |
| energy density [min. - max.] ? | 48-53 | BH max MGOe |
| energy density [min. - max.] ? | 380-422 | 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 assembly - technical parameters
Presented information constitute the result of a engineering analysis. Results rely on algorithms for the class Nd2Fe14B. Operational parameters may differ. Treat these calculations as a reference point during assembly planning.
Table 1: Static pull force (force vs gap) - power drop
MW 12x4 / N52
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4003 Gs
400.3 mT
|
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
|
medium risk |
| 1 mm |
3438 Gs
343.8 mT
|
3.45 kg / 7.61 LBS
3451.9 g / 33.9 N
|
medium risk |
| 2 mm |
2824 Gs
282.4 mT
|
2.33 kg / 5.14 LBS
2329.8 g / 22.9 N
|
medium risk |
| 3 mm |
2255 Gs
225.5 mT
|
1.48 kg / 3.27 LBS
1484.8 g / 14.6 N
|
low risk |
| 5 mm |
1386 Gs
138.6 mT
|
0.56 kg / 1.24 LBS
561.3 g / 5.5 N
|
low risk |
| 10 mm |
445 Gs
44.5 mT
|
0.06 kg / 0.13 LBS
58.0 g / 0.6 N
|
low risk |
| 15 mm |
181 Gs
18.1 mT
|
0.01 kg / 0.02 LBS
9.6 g / 0.1 N
|
low risk |
| 20 mm |
89 Gs
8.9 mT
|
0.00 kg / 0.01 LBS
2.3 g / 0.0 N
|
low risk |
| 30 mm |
30 Gs
3.0 mT
|
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
|
low risk |
| 50 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Vertical force (vertical surface)
MW 12x4 / N52
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.94 kg / 2.06 LBS
936.0 g / 9.2 N
|
| 1 mm | Stal (~0.2) |
0.69 kg / 1.52 LBS
690.0 g / 6.8 N
|
| 2 mm | Stal (~0.2) |
0.47 kg / 1.03 LBS
466.0 g / 4.6 N
|
| 3 mm | Stal (~0.2) |
0.30 kg / 0.65 LBS
296.0 g / 2.9 N
|
| 5 mm | Stal (~0.2) |
0.11 kg / 0.25 LBS
112.0 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: Vertical assembly (shearing) - vertical pull
MW 12x4 / N52
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.40 kg / 3.10 LBS
1404.0 g / 13.8 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.94 kg / 2.06 LBS
936.0 g / 9.2 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.47 kg / 1.03 LBS
468.0 g / 4.6 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.34 kg / 5.16 LBS
2340.0 g / 23.0 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 12x4 / N52
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.47 kg / 1.03 LBS
468.0 g / 4.6 N
|
| 1 mm |
|
1.17 kg / 2.58 LBS
1170.0 g / 11.5 N
|
| 2 mm |
|
2.34 kg / 5.16 LBS
2340.0 g / 23.0 N
|
| 3 mm |
|
3.51 kg / 7.74 LBS
3510.0 g / 34.4 N
|
| 5 mm |
|
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
|
| 10 mm |
|
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
|
| 11 mm |
|
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
|
| 12 mm |
|
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
|
Table 5: Thermal stability (material behavior) - resistance threshold
MW 12x4 / N52
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.68 kg / 10.32 LBS
4680.0 g / 45.9 N
|
OK |
| 40 °C | -2.2% |
4.58 kg / 10.09 LBS
4577.0 g / 44.9 N
|
OK |
| 60 °C | -4.4% |
4.47 kg / 9.86 LBS
4474.1 g / 43.9 N
|
|
| 80 °C | -6.6% |
4.37 kg / 9.64 LBS
4371.1 g / 42.9 N
|
|
| 100 °C | -28.8% |
3.33 kg / 7.35 LBS
3332.2 g / 32.7 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 12x4 / N52
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
11.17 kg / 24.63 LBS
5 771 Gs
|
1.68 kg / 3.69 LBS
1676 g / 16.4 N
|
N/A |
| 1 mm |
9.73 kg / 21.44 LBS
7 470 Gs
|
1.46 kg / 3.22 LBS
1459 g / 14.3 N
|
8.75 kg / 19.30 LBS
~0 Gs
|
| 2 mm |
8.24 kg / 18.16 LBS
6 875 Gs
|
1.24 kg / 2.72 LBS
1236 g / 12.1 N
|
7.42 kg / 16.35 LBS
~0 Gs
|
| 3 mm |
6.83 kg / 15.06 LBS
6 260 Gs
|
1.02 kg / 2.26 LBS
1024 g / 10.1 N
|
6.15 kg / 13.55 LBS
~0 Gs
|
| 5 mm |
4.46 kg / 9.84 LBS
5 060 Gs
|
0.67 kg / 1.48 LBS
670 g / 6.6 N
|
4.02 kg / 8.86 LBS
~0 Gs
|
| 10 mm |
1.34 kg / 2.95 LBS
2 772 Gs
|
0.20 kg / 0.44 LBS
201 g / 2.0 N
|
1.21 kg / 2.66 LBS
~0 Gs
|
| 20 mm |
0.14 kg / 0.30 LBS
891 Gs
|
0.02 kg / 0.05 LBS
21 g / 0.2 N
|
0.12 kg / 0.27 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
99 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
61 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
40 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
27 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
20 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
15 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Hazards (implants) - warnings
MW 12x4 / N52
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 3.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (cracking risk) - collision effects
MW 12x4 / N52
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
37.76 km/h
(10.49 m/s)
|
0.19 J | |
| 30 mm |
64.91 km/h
(18.03 m/s)
|
0.55 J | |
| 50 mm |
83.79 km/h
(23.27 m/s)
|
0.92 J | |
| 100 mm |
118.50 km/h
(32.92 m/s)
|
1.84 J |
Table 9: Coating parameters (durability)
MW 12x4 / N52
| 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 12x4 / N52
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 4 794 Mx | 47.9 µWb |
| Pc Coefficient | 0.44 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MW 12x4 / N52
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 4.68 kg | Standard |
| Water (riverbed) |
5.36 kg
(+0.68 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical surface, the magnet holds only ~20% of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. computer case) drastically reduces 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) = 0.44
This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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% |
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.
Strengths
- They do not lose magnetism, even over around 10 years – the drop in power is only ~1% (based on measurements),
- They have excellent resistance to magnetism drop when exposed to external fields,
- Thanks to the metallic finish, the surface of nickel, gold, or silver gives an elegant appearance,
- The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to freedom in constructing and the ability to adapt to complex applications,
- Wide application in innovative solutions – they are used in magnetic memories, drive modules, medical equipment, as well as multitasking production systems.
- Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,
Weaknesses
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets usually 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.
- Limited ability of producing nuts in the magnet and complicated shapes - preferred is a housing - mounting mechanism.
- Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products can be problematic in diagnostics medical after entering the body.
- With large orders the cost of neodymium magnets can be a barrier,
Lifting parameters
Detachment force of the magnet in optimal conditions – what it depends on?
- on a plate made of structural steel, optimally conducting the magnetic flux
- whose thickness reaches at least 10 mm
- with an polished contact surface
- without any clearance between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- at conditions approx. 20°C
Lifting capacity in practice – influencing factors
- Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
- Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
- Material type – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
- Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
- Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.
Precautions when working with neodymium magnets
No play value
Always keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets clamping inside the body are life-threatening.
Combustion hazard
Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.
Crushing force
Large magnets can smash fingers instantly. Under no circumstances place your hand between two attracting surfaces.
Sensitization to coating
Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation appears, immediately stop handling magnets and use protective gear.
Handling guide
Be careful. Neodymium magnets attract from a distance and connect with huge force, often quicker than you can move away.
Warning for heart patients
Individuals with a pacemaker should maintain an absolute distance from magnets. The magnetism can disrupt the functioning of the life-saving device.
Magnetic interference
Note: neodymium magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, device, and navigation systems.
Thermal limits
Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.
Magnet fragility
Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Threat to electronics
Avoid bringing magnets close to a purse, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.
