MW 5x30 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010088
GTIN/EAN: 5906301810872
- Diameter Ø
- 5 mm [±0,1 mm]
- Height
- 30 mm [±0,1 mm]
- Weight
- 4.42 g
- Magnetization Direction
- ↑ axial
- Coating
- [NiCuNi] Nickel
3.57 zł with VAT / pcs + price for transport
2.90 zł net + 23% VAT / pcs
bulk discounts:
Need more?Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Product card - MW 5x30 / N38 - cylindrical magnet
Specification / characteristics - MW 5x30 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010088 |
| GTIN/EAN | 5906301810872 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 5 mm [±0,1 mm] |
| Height | 30 mm [±0,1 mm] |
| Weight | 4.42 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.45 kg / 4.40 N |
| Magnetic Induction ~ ? | 616.32 mT / 6163 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 simulation of the assembly - data
Presented data are the result of a engineering simulation. Results were calculated on models for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Treat these calculations as a reference point during assembly planning.
Table 1: Static pull force (pull vs distance) - characteristics
MW 5x30 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6154 Gs
615.4 mT
|
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
weak grip |
| 1 mm |
3877 Gs
387.7 mT
|
0.18 kg / 0.39 LBS
178.6 g / 1.8 N
|
weak grip |
| 2 mm |
2308 Gs
230.8 mT
|
0.06 kg / 0.14 LBS
63.3 g / 0.6 N
|
weak grip |
| 3 mm |
1419 Gs
141.9 mT
|
0.02 kg / 0.05 LBS
23.9 g / 0.2 N
|
weak grip |
| 5 mm |
639 Gs
63.9 mT
|
0.00 kg / 0.01 LBS
4.8 g / 0.0 N
|
weak grip |
| 10 mm |
173 Gs
17.3 mT
|
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
|
weak grip |
| 15 mm |
75 Gs
7.5 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
weak grip |
| 20 mm |
40 Gs
4.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage load (wall)
MW 5x30 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| 1 mm | Stal (~0.2) |
0.04 kg / 0.08 LBS
36.0 g / 0.4 N
|
| 2 mm | Stal (~0.2) |
0.01 kg / 0.03 LBS
12.0 g / 0.1 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.01 LBS
4.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 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 (shearing) - behavior on slippery surfaces
MW 5x30 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.14 kg / 0.30 LBS
135.0 g / 1.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.05 kg / 0.10 LBS
45.0 g / 0.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.23 kg / 0.50 LBS
225.0 g / 2.2 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 5x30 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.05 kg / 0.10 LBS
45.0 g / 0.4 N
|
| 1 mm |
|
0.11 kg / 0.25 LBS
112.5 g / 1.1 N
|
| 2 mm |
|
0.23 kg / 0.50 LBS
225.0 g / 2.2 N
|
| 3 mm |
|
0.34 kg / 0.74 LBS
337.5 g / 3.3 N
|
| 5 mm |
|
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
| 10 mm |
|
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
| 11 mm |
|
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
| 12 mm |
|
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
Table 5: Working in heat (stability) - thermal limit
MW 5x30 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
|
OK |
| 40 °C | -2.2% |
0.44 kg / 0.97 LBS
440.1 g / 4.3 N
|
OK |
| 60 °C | -4.4% |
0.43 kg / 0.95 LBS
430.2 g / 4.2 N
|
OK |
| 80 °C | -6.6% |
0.42 kg / 0.93 LBS
420.3 g / 4.1 N
|
|
| 100 °C | -28.8% |
0.32 kg / 0.71 LBS
320.4 g / 3.1 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 5x30 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
4.58 kg / 10.11 LBS
6 170 Gs
|
0.69 kg / 1.52 LBS
688 g / 6.7 N
|
N/A |
| 1 mm |
2.98 kg / 6.57 LBS
9 927 Gs
|
0.45 kg / 0.99 LBS
447 g / 4.4 N
|
2.68 kg / 5.92 LBS
~0 Gs
|
| 2 mm |
1.82 kg / 4.01 LBS
7 755 Gs
|
0.27 kg / 0.60 LBS
273 g / 2.7 N
|
1.64 kg / 3.61 LBS
~0 Gs
|
| 3 mm |
1.08 kg / 2.39 LBS
5 981 Gs
|
0.16 kg / 0.36 LBS
162 g / 1.6 N
|
0.97 kg / 2.15 LBS
~0 Gs
|
| 5 mm |
0.39 kg / 0.86 LBS
3 595 Gs
|
0.06 kg / 0.13 LBS
59 g / 0.6 N
|
0.35 kg / 0.78 LBS
~0 Gs
|
| 10 mm |
0.05 kg / 0.11 LBS
1 278 Gs
|
0.01 kg / 0.02 LBS
7 g / 0.1 N
|
0.04 kg / 0.10 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 LBS
346 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
49 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
32 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
22 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
16 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
12 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
9 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Hazards (electronics) - warnings
MW 5x30 / 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 |
| Mechanical watch | 20 Gs (2.0 mT) | 3.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.5 cm |
| Car key | 50 Gs (5.0 mT) | 2.0 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 5x30 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
5.27 km/h
(1.46 m/s)
|
0.00 J | |
| 30 mm |
5.28 km/h
(1.47 m/s)
|
0.00 J | |
| 50 mm |
5.28 km/h
(1.47 m/s)
|
0.00 J | |
| 100 mm |
5.28 km/h
(1.47 m/s)
|
0.00 J |
Table 9: Corrosion resistance
MW 5x30 / 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 5x30 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 468 Mx | 14.7 µWb |
| Pc Coefficient | 1.59 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MW 5x30 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.45 kg | Standard |
| Water (riverbed) |
0.52 kg
(+0.07 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) drastically weakens the holding force.
3. Thermal stability
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.59
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Strengths and weaknesses of Nd2Fe14B magnets.
Advantages
- They virtually do not lose power, because even after ten years the performance loss is only ~1% (in laboratory conditions),
- They show high resistance to demagnetization induced by presence of other magnetic fields,
- A magnet with a smooth silver surface looks better,
- They are known for high magnetic induction at the operating surface, which improves attraction properties,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of precise forming as well as adjusting to complex applications,
- Fundamental importance in modern technologies – they serve a role in computer drives, electric motors, precision medical tools, also other advanced devices.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only protects them against impacts but also raises their durability
- Neodymium magnets decrease their power 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
- Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in realizing nuts and complex forms in magnets, we propose using a housing - magnetic mount.
- Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small components of these devices are able to be problematic in diagnostics medical in case of swallowing.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Pull force analysis
Optimal lifting capacity of a neodymium magnet – what it depends on?
- with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
- possessing a thickness of at least 10 mm to avoid saturation
- with an polished contact surface
- without the slightest air gap between the magnet and steel
- under perpendicular application of breakaway force (90-degree angle)
- in temp. approx. 20°C
Lifting capacity in real conditions – factors
- Air gap (between the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Direction of force – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
- Base massiveness – insufficiently thick steel does not accept the full field, causing part of the power to be escaped into the air.
- Metal type – not every steel attracts identically. Alloy additives weaken the attraction effect.
- Surface structure – the more even the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
- Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.
Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.
Precautions when working with neodymium magnets
Product not for children
Adult use only. Tiny parts pose a choking risk, leading to serious injuries. Store away from children and animals.
Precision electronics
GPS units and smartphones are highly susceptible to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.
Health Danger
People with a heart stimulator have to maintain an safe separation from magnets. The magnetism can disrupt the functioning of the life-saving device.
Beware of splinters
NdFeB magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets leads to them breaking into shards.
Do not underestimate power
Handle with care. Rare earth magnets act from a long distance and snap with huge force, often faster than you can react.
Safe distance
Device Safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, hearing aids, timepieces).
Crushing force
Mind your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!
Allergic reactions
Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, cease handling magnets and wear gloves.
Do not overheat magnets
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and strength.
Fire warning
Machining of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
