MW 5x3 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010087
GTIN/EAN: 5906301810865
Diameter Ø
5 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
0.44 g
Magnetization Direction
↑ axial
Load capacity
0.84 kg / 8.25 N
Magnetic Induction
475.16 mT / 4752 Gs
Coating
[NiCuNi] Nickel
0.283 ZŁ with VAT / pcs + price for transport
0.230 ZŁ net + 23% VAT / pcs
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Technical specification - MW 5x3 / N38 - cylindrical magnet
Specification / characteristics - MW 5x3 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010087 |
| GTIN/EAN | 5906301810865 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 5 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 0.44 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.84 kg / 8.25 N |
| Magnetic Induction ~ ? | 475.16 mT / 4752 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 analysis of the assembly - report
Presented data represent the result of a mathematical calculation. Values were calculated on algorithms for the class Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these calculations as a supplementary guide when designing systems.
Table 1: Static pull force (force vs gap) - characteristics
MW 5x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4745 Gs
474.5 mT
|
0.84 kg / 1.85 lbs
840.0 g / 8.2 N
|
safe |
| 1 mm |
2955 Gs
295.5 mT
|
0.33 kg / 0.72 lbs
325.8 g / 3.2 N
|
safe |
| 2 mm |
1672 Gs
167.2 mT
|
0.10 kg / 0.23 lbs
104.4 g / 1.0 N
|
safe |
| 3 mm |
960 Gs
96.0 mT
|
0.03 kg / 0.08 lbs
34.4 g / 0.3 N
|
safe |
| 5 mm |
372 Gs
37.2 mT
|
0.01 kg / 0.01 lbs
5.2 g / 0.1 N
|
safe |
| 10 mm |
74 Gs
7.4 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
safe |
| 15 mm |
25 Gs
2.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 20 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 30 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Sliding capacity (wall)
MW 5x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.17 kg / 0.37 lbs
168.0 g / 1.6 N
|
| 1 mm | Stal (~0.2) |
0.07 kg / 0.15 lbs
66.0 g / 0.6 N
|
| 2 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
20.0 g / 0.2 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.01 lbs
6.0 g / 0.1 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 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 (sliding) - vertical pull
MW 5x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.25 kg / 0.56 lbs
252.0 g / 2.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.17 kg / 0.37 lbs
168.0 g / 1.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.08 kg / 0.19 lbs
84.0 g / 0.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.42 kg / 0.93 lbs
420.0 g / 4.1 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 5x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.08 kg / 0.19 lbs
84.0 g / 0.8 N
|
| 1 mm |
|
0.21 kg / 0.46 lbs
210.0 g / 2.1 N
|
| 2 mm |
|
0.42 kg / 0.93 lbs
420.0 g / 4.1 N
|
| 3 mm |
|
0.63 kg / 1.39 lbs
630.0 g / 6.2 N
|
| 5 mm |
|
0.84 kg / 1.85 lbs
840.0 g / 8.2 N
|
| 10 mm |
|
0.84 kg / 1.85 lbs
840.0 g / 8.2 N
|
| 11 mm |
|
0.84 kg / 1.85 lbs
840.0 g / 8.2 N
|
| 12 mm |
|
0.84 kg / 1.85 lbs
840.0 g / 8.2 N
|
Table 5: Thermal stability (material behavior) - power drop
MW 5x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.84 kg / 1.85 lbs
840.0 g / 8.2 N
|
OK |
| 40 °C | -2.2% |
0.82 kg / 1.81 lbs
821.5 g / 8.1 N
|
OK |
| 60 °C | -4.4% |
0.80 kg / 1.77 lbs
803.0 g / 7.9 N
|
OK |
| 80 °C | -6.6% |
0.78 kg / 1.73 lbs
784.6 g / 7.7 N
|
|
| 100 °C | -28.8% |
0.60 kg / 1.32 lbs
598.1 g / 5.9 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 5x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.73 kg / 6.01 lbs
5 700 Gs
|
0.41 kg / 0.90 lbs
409 g / 4.0 N
|
N/A |
| 1 mm |
1.77 kg / 3.91 lbs
7 658 Gs
|
0.27 kg / 0.59 lbs
266 g / 2.6 N
|
1.60 kg / 3.52 lbs
~0 Gs
|
| 2 mm |
1.06 kg / 2.33 lbs
5 910 Gs
|
0.16 kg / 0.35 lbs
159 g / 1.6 N
|
0.95 kg / 2.10 lbs
~0 Gs
|
| 3 mm |
0.60 kg / 1.33 lbs
4 460 Gs
|
0.09 kg / 0.20 lbs
90 g / 0.9 N
|
0.54 kg / 1.19 lbs
~0 Gs
|
| 5 mm |
0.19 kg / 0.42 lbs
2 520 Gs
|
0.03 kg / 0.06 lbs
29 g / 0.3 N
|
0.17 kg / 0.38 lbs
~0 Gs
|
| 10 mm |
0.02 kg / 0.04 lbs
745 Gs
|
0.00 kg / 0.01 lbs
3 g / 0.0 N
|
0.02 kg / 0.03 lbs
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 lbs
147 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
12 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
7 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
5 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
3 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
2 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
2 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 5x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 1.5 cm |
| Car key | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (kinetic energy) - warning
MW 5x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
44.07 km/h
(12.24 m/s)
|
0.03 J | |
| 30 mm |
76.32 km/h
(21.20 m/s)
|
0.10 J | |
| 50 mm |
98.53 km/h
(27.37 m/s)
|
0.16 J | |
| 100 mm |
139.35 km/h
(38.71 m/s)
|
0.33 J |
Table 9: Surface protection spec
MW 5x3 / 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 5x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 942 Mx | 9.4 µWb |
| Pc Coefficient | 0.66 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MW 5x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.84 kg | Standard |
| Water (riverbed) |
0.96 kg
(+0.12 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.
3. Power loss vs temp
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.66
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 |
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Pros and cons of rare earth magnets.
Benefits
- They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
- They show high resistance to demagnetization induced by presence of other magnetic fields,
- In other words, due to the aesthetic surface of nickel, the element looks attractive,
- Magnets are distinguished by extremely high magnetic induction on the surface,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Possibility of custom shaping and optimizing to individual applications,
- Significant place in high-tech industry – they serve a role in mass storage devices, brushless drives, precision medical tools, and modern systems.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Cons
- To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- Due to limitations in realizing nuts and complicated forms in magnets, we propose using a housing - magnetic holder.
- Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- using a base made of low-carbon steel, acting as a magnetic yoke
- whose transverse dimension equals approx. 10 mm
- characterized by lack of roughness
- without the slightest clearance between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- at temperature approx. 20 degrees Celsius
Lifting capacity in practice – influencing factors
- Air gap (betwixt the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
- Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Plate material – mild steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
- Surface structure – the more even the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance between the magnet and the plate reduces the holding force.
Safe handling of neodymium magnets
Beware of splinters
Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. We recommend safety glasses.
Do not drill into magnets
Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.
Crushing force
Big blocks can smash fingers in a fraction of a second. Under no circumstances put your hand between two attracting surfaces.
Skin irritation risks
It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands and select coated magnets.
Implant safety
Warning for patients: Powerful magnets affect electronics. Keep at least 30 cm distance or request help to handle the magnets.
Keep away from children
Only for adults. Small elements pose a choking risk, causing serious injuries. Store away from children and animals.
Keep away from electronics
An intense magnetic field disrupts the operation of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a device to prevent breaking the sensors.
Heat warning
Monitor thermal conditions. Exposing the magnet to high heat will destroy its properties and strength.
Protect data
Equipment safety: Strong magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).
Powerful field
Before starting, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.
