MW 5x5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010503
GTIN/EAN: 5906301814979
Diameter Ø
5 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
0.74 g
Magnetization Direction
↑ axial
Load capacity
0.79 kg / 7.76 N
Magnetic Induction
553.14 mT / 5531 Gs
Coating
[NiCuNi] Nickel
0.394 ZŁ with VAT / pcs + price for transport
0.320 ZŁ net + 23% VAT / pcs
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Technical - MW 5x5 / N38 - cylindrical magnet
Specification / characteristics - MW 5x5 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010503 |
| GTIN/EAN | 5906301814979 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 5 mm [±0,1 mm] |
| Height | 5 mm [±0,1 mm] |
| Weight | 0.74 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.79 kg / 7.76 N |
| Magnetic Induction ~ ? | 553.14 mT / 5531 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 product - technical parameters
The following information constitute the result of a mathematical calculation. Results are based on models for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Please consider these data as a preliminary roadmap for designers.
Table 1: Static pull force (force vs distance) - interaction chart
MW 5x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5523 Gs
552.3 mT
|
0.79 kg / 1.74 LBS
790.0 g / 7.7 N
|
weak grip |
| 1 mm |
3420 Gs
342.0 mT
|
0.30 kg / 0.67 LBS
303.0 g / 3.0 N
|
weak grip |
| 2 mm |
1966 Gs
196.6 mT
|
0.10 kg / 0.22 LBS
100.1 g / 1.0 N
|
weak grip |
| 3 mm |
1155 Gs
115.5 mT
|
0.03 kg / 0.08 LBS
34.5 g / 0.3 N
|
weak grip |
| 5 mm |
469 Gs
46.9 mT
|
0.01 kg / 0.01 LBS
5.7 g / 0.1 N
|
weak grip |
| 10 mm |
101 Gs
10.1 mT
|
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
|
weak grip |
| 15 mm |
36 Gs
3.6 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
17 Gs
1.7 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
6 Gs
0.6 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Vertical force (vertical surface)
MW 5x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.16 kg / 0.35 LBS
158.0 g / 1.5 N
|
| 1 mm | Stal (~0.2) |
0.06 kg / 0.13 LBS
60.0 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: Vertical assembly (sliding) - vertical pull
MW 5x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.24 kg / 0.52 LBS
237.0 g / 2.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.16 kg / 0.35 LBS
158.0 g / 1.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.08 kg / 0.17 LBS
79.0 g / 0.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.40 kg / 0.87 LBS
395.0 g / 3.9 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MW 5x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.08 kg / 0.17 LBS
79.0 g / 0.8 N
|
| 1 mm |
|
0.20 kg / 0.44 LBS
197.5 g / 1.9 N
|
| 2 mm |
|
0.40 kg / 0.87 LBS
395.0 g / 3.9 N
|
| 3 mm |
|
0.59 kg / 1.31 LBS
592.5 g / 5.8 N
|
| 5 mm |
|
0.79 kg / 1.74 LBS
790.0 g / 7.7 N
|
| 10 mm |
|
0.79 kg / 1.74 LBS
790.0 g / 7.7 N
|
| 11 mm |
|
0.79 kg / 1.74 LBS
790.0 g / 7.7 N
|
| 12 mm |
|
0.79 kg / 1.74 LBS
790.0 g / 7.7 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MW 5x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.79 kg / 1.74 LBS
790.0 g / 7.7 N
|
OK |
| 40 °C | -2.2% |
0.77 kg / 1.70 LBS
772.6 g / 7.6 N
|
OK |
| 60 °C | -4.4% |
0.76 kg / 1.67 LBS
755.2 g / 7.4 N
|
OK |
| 80 °C | -6.6% |
0.74 kg / 1.63 LBS
737.9 g / 7.2 N
|
|
| 100 °C | -28.8% |
0.56 kg / 1.24 LBS
562.5 g / 5.5 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 5x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
3.69 kg / 8.14 LBS
5 990 Gs
|
0.55 kg / 1.22 LBS
554 g / 5.4 N
|
N/A |
| 1 mm |
2.37 kg / 5.23 LBS
8 857 Gs
|
0.36 kg / 0.79 LBS
356 g / 3.5 N
|
2.14 kg / 4.71 LBS
~0 Gs
|
| 2 mm |
1.42 kg / 3.12 LBS
6 841 Gs
|
0.21 kg / 0.47 LBS
212 g / 2.1 N
|
1.27 kg / 2.81 LBS
~0 Gs
|
| 3 mm |
0.82 kg / 1.80 LBS
5 194 Gs
|
0.12 kg / 0.27 LBS
122 g / 1.2 N
|
0.73 kg / 1.62 LBS
~0 Gs
|
| 5 mm |
0.27 kg / 0.60 LBS
2 996 Gs
|
0.04 kg / 0.09 LBS
41 g / 0.4 N
|
0.24 kg / 0.54 LBS
~0 Gs
|
| 10 mm |
0.03 kg / 0.06 LBS
939 Gs
|
0.00 kg / 0.01 LBS
4 g / 0.0 N
|
0.02 kg / 0.05 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 LBS
202 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
19 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
11 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
7 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
5 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
4 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
3 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MW 5x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 2.0 cm |
| Phone / Smartphone | 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) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (cracking risk) - warning
MW 5x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
32.96 km/h
(9.16 m/s)
|
0.03 J | |
| 30 mm |
57.07 km/h
(15.85 m/s)
|
0.09 J | |
| 50 mm |
73.68 km/h
(20.47 m/s)
|
0.15 J | |
| 100 mm |
104.20 km/h
(28.95 m/s)
|
0.31 J |
Table 9: Coating parameters (durability)
MW 5x5 / 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 5x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 120 Mx | 11.2 µWb |
| Pc Coefficient | 0.89 | High (Stable) |
Table 11: Physics of underwater searching
MW 5x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.79 kg | Standard |
| Water (riverbed) |
0.90 kg
(+0.11 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical wall, the magnet holds merely ~20% of its max power.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Thermal stability
*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) = 0.89
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Advantages as well as disadvantages of neodymium magnets.
Pros
- They retain full power for nearly 10 years – the loss is just ~1% (according to analyses),
- They are resistant to demagnetization induced by external field influence,
- In other words, due to the smooth finish of silver, the element gains visual value,
- Magnetic induction on the working part of the magnet turns out to be maximum,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Due to the ability of accurate forming and customization to custom requirements, NdFeB magnets can be manufactured in a variety of shapes and sizes, which amplifies use scope,
- Key role in modern technologies – they serve a role in hard drives, drive modules, medical equipment, also other advanced devices.
- Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,
Disadvantages
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- We suggest casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated shapes.
- Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small elements of these devices are able to be problematic in diagnostics medical when they are in 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
Pull force analysis
Highest magnetic holding force – what it depends on?
- with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
- whose transverse dimension reaches at least 10 mm
- with a surface perfectly flat
- without any insulating layer between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- at standard ambient temperature
What influences lifting capacity in practice
- Distance – existence of any layer (paint, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
- Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
- Steel type – mild steel gives the best results. Higher carbon content lower magnetic properties and holding force.
- Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).
Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet and the plate reduces the holding force.
Safe handling of NdFeB magnets
Serious injuries
Large magnets can smash fingers instantly. Do not put your hand betwixt two strong magnets.
No play value
Neodymium magnets are not toys. Eating multiple magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates immediate surgery.
Combustion hazard
Fire hazard: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.
Allergic reactions
Some people experience a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact might lead to a rash. We recommend use safety gloves.
Cards and drives
Very strong magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.
Caution required
Handle magnets with awareness. Their huge power can surprise even professionals. Plan your moves and do not underestimate their force.
Threat to navigation
Navigation devices and mobile phones are highly susceptible to magnetism. Close proximity with a strong magnet can ruin the internal compass in your phone.
ICD Warning
Individuals with a heart stimulator must keep an absolute distance from magnets. The magnetism can disrupt the operation of the life-saving device.
Eye protection
Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.
Operating temperature
Avoid heat. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).
