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 details - 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 |
Engineering modeling of the assembly - technical parameters
Presented data constitute the direct effect of a physical simulation. Results are based on models for the material Nd2Fe14B. Real-world performance might slightly differ. Treat these calculations as a reference point for designers.
Table 1: Static pull force (pull vs gap) - characteristics
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 pounds
790.0 g / 7.7 N
|
weak grip |
| 1 mm |
3420 Gs
342.0 mT
|
0.30 kg / 0.67 pounds
303.0 g / 3.0 N
|
weak grip |
| 2 mm |
1966 Gs
196.6 mT
|
0.10 kg / 0.22 pounds
100.1 g / 1.0 N
|
weak grip |
| 3 mm |
1155 Gs
115.5 mT
|
0.03 kg / 0.08 pounds
34.5 g / 0.3 N
|
weak grip |
| 5 mm |
469 Gs
46.9 mT
|
0.01 kg / 0.01 pounds
5.7 g / 0.1 N
|
weak grip |
| 10 mm |
101 Gs
10.1 mT
|
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
|
weak grip |
| 15 mm |
36 Gs
3.6 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
17 Gs
1.7 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
6 Gs
0.6 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
weak grip |
Table 2: Shear load (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 pounds
158.0 g / 1.5 N
|
| 1 mm | Stal (~0.2) |
0.06 kg / 0.13 pounds
60.0 g / 0.6 N
|
| 2 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
20.0 g / 0.2 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 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: Vertical assembly (sliding) - behavior on slippery surfaces
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 pounds
237.0 g / 2.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.16 kg / 0.35 pounds
158.0 g / 1.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.08 kg / 0.17 pounds
79.0 g / 0.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.40 kg / 0.87 pounds
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 pounds
79.0 g / 0.8 N
|
| 1 mm |
|
0.20 kg / 0.44 pounds
197.5 g / 1.9 N
|
| 2 mm |
|
0.40 kg / 0.87 pounds
395.0 g / 3.9 N
|
| 3 mm |
|
0.59 kg / 1.31 pounds
592.5 g / 5.8 N
|
| 5 mm |
|
0.79 kg / 1.74 pounds
790.0 g / 7.7 N
|
| 10 mm |
|
0.79 kg / 1.74 pounds
790.0 g / 7.7 N
|
| 11 mm |
|
0.79 kg / 1.74 pounds
790.0 g / 7.7 N
|
| 12 mm |
|
0.79 kg / 1.74 pounds
790.0 g / 7.7 N
|
Table 5: Working in heat (stability) - thermal limit
MW 5x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.79 kg / 1.74 pounds
790.0 g / 7.7 N
|
OK |
| 40 °C | -2.2% |
0.77 kg / 1.70 pounds
772.6 g / 7.6 N
|
OK |
| 60 °C | -4.4% |
0.76 kg / 1.67 pounds
755.2 g / 7.4 N
|
OK |
| 80 °C | -6.6% |
0.74 kg / 1.63 pounds
737.9 g / 7.2 N
|
|
| 100 °C | -28.8% |
0.56 kg / 1.24 pounds
562.5 g / 5.5 N
|
Table 6: Two magnets (repulsion) - field range
MW 5x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
3.69 kg / 8.14 pounds
5 990 Gs
|
0.55 kg / 1.22 pounds
554 g / 5.4 N
|
N/A |
| 1 mm |
2.37 kg / 5.23 pounds
8 857 Gs
|
0.36 kg / 0.79 pounds
356 g / 3.5 N
|
2.14 kg / 4.71 pounds
~0 Gs
|
| 2 mm |
1.42 kg / 3.12 pounds
6 841 Gs
|
0.21 kg / 0.47 pounds
212 g / 2.1 N
|
1.27 kg / 2.81 pounds
~0 Gs
|
| 3 mm |
0.82 kg / 1.80 pounds
5 194 Gs
|
0.12 kg / 0.27 pounds
122 g / 1.2 N
|
0.73 kg / 1.62 pounds
~0 Gs
|
| 5 mm |
0.27 kg / 0.60 pounds
2 996 Gs
|
0.04 kg / 0.09 pounds
41 g / 0.4 N
|
0.24 kg / 0.54 pounds
~0 Gs
|
| 10 mm |
0.03 kg / 0.06 pounds
939 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 pounds
202 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
19 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
11 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
7 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
5 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
4 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
3 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Hazards (implants) - warnings
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 |
| Timepiece | 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: Collisions (kinetic energy) - 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: Electrical data (Pc)
MW 5x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 120 Mx | 11.2 µWb |
| Pc Coefficient | 0.89 | High (Stable) |
Table 11: Submerged application
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. Sliding resistance
*Caution: On a vertical surface, the magnet retains merely a fraction of its max power.
2. Steel saturation
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Temperature resistance
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.89
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.
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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Advantages and disadvantages of rare earth magnets.
Advantages
- They do not lose magnetism, even over nearly ten years – the drop in lifting capacity is only ~1% (based on measurements),
- Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
- By using a lustrous coating of gold, the element has an nice look,
- Neodymium magnets create maximum magnetic induction on a small area, which allows for strong attraction,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to versatility in constructing and the capacity to adapt to complex applications,
- Universal use in innovative solutions – they are utilized in HDD drives, electric drive systems, diagnostic systems, also complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in miniature devices
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
- Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- When exposed to humidity, magnets start to 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 possibility of making threads in the magnet and complex shapes - preferred is cover - magnetic holder.
- Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these products are able to be problematic in diagnostics 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 sheet made of mild steel, functioning as a ideal flux conductor
- possessing a thickness of at least 10 mm to ensure full flux closure
- with a surface cleaned and smooth
- with zero gap (no coatings)
- for force applied at a right angle (pull-off, not shear)
- at standard ambient temperature
Lifting capacity in practice – influencing factors
- Air gap (between the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, rust or debris).
- Force direction – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
- Metal type – not every steel attracts identically. High carbon content weaken the attraction effect.
- Plate texture – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces weaken the grip.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Lifting capacity was determined with the use of a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.
Precautions when working with neodymium magnets
Immense force
Handle with care. Neodymium magnets attract from a long distance and snap with massive power, often faster than you can move away.
Phone sensors
GPS units and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.
Protect data
Powerful magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Maintain a gap of min. 10 cm.
Bodily injuries
Danger of trauma: The attraction force is so immense that it can cause hematomas, pinching, and broken bones. Protective gloves are recommended.
Risk of cracking
Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.
Demagnetization risk
Control the heat. Heating the magnet to high heat will ruin its properties and pulling force.
Product not for children
Only for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep away from kids and pets.
Combustion hazard
Drilling and cutting of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.
Warning for heart patients
For implant holders: Strong magnetic fields disrupt medical devices. Keep at least 30 cm distance or ask another person to handle the magnets.
Allergy Warning
Certain individuals experience a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Frequent touching can result in a rash. We strongly advise wear protective gloves.
