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
2.90 zł net / pcs
3.57 zł with VAT (23% VAT) / pcs
bulk discounts:
Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
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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Technical data of the product - 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 magnet - data
The following data are the direct effect of a engineering analysis. Results were calculated on algorithms for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Treat these calculations as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs gap) - 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
|
low risk |
| 1 mm |
3877 Gs
387.7 mT
|
0.18 kg / 0.39 lbs
178.6 g / 1.8 N
|
low risk |
| 2 mm |
2308 Gs
230.8 mT
|
0.06 kg / 0.14 lbs
63.3 g / 0.6 N
|
low risk |
| 3 mm |
1419 Gs
141.9 mT
|
0.02 kg / 0.05 lbs
23.9 g / 0.2 N
|
low risk |
| 5 mm |
639 Gs
63.9 mT
|
0.00 kg / 0.01 lbs
4.8 g / 0.0 N
|
low risk |
| 10 mm |
173 Gs
17.3 mT
|
0.00 kg / 0.00 lbs
0.4 g / 0.0 N
|
low risk |
| 15 mm |
75 Gs
7.5 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
low risk |
| 20 mm |
40 Gs
4.0 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
| 30 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
Table 2: Shear capacity (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) - vertical pull
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 (saturation) - power losses
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: Thermal stability (stability) - resistance threshold
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) | Shear Strength (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: Protective zones (implants) - precautionary measures
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 |
| Timepiece | 20 Gs (2.0 mT) | 3.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.5 cm |
| Remote | 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 (cracking risk) - 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: Anti-corrosion coating durability
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 (Flux)
MW 5x30 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 468 Mx | 14.7 µWb |
| Pc Coefficient | 1.59 | High (Stable) |
Table 11: Physics of underwater searching
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
*Caution: On a vertical wall, the magnet holds only a fraction of its perpendicular strength.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) severely reduces the holding force.
3. Temperature resistance
*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) = 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 |
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Pros as well as cons of neodymium magnets.
Pros
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
- They retain their magnetic properties even under external field action,
- In other words, due to the shiny surface of gold, the element gains a professional look,
- Neodymium magnets ensure maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Thanks to modularity in shaping and the ability to modify to unusual requirements,
- Wide application in modern technologies – they find application in magnetic memories, electric drive systems, precision medical tools, and other advanced devices.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Weaknesses
- At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 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 possibility of creating threads in the magnet and complex shapes - recommended is casing - mounting mechanism.
- Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
- With mass production the cost of neodymium magnets is a challenge,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
- with a cross-section no less than 10 mm
- with an ground contact surface
- with zero gap (without impurities)
- for force acting at a right angle (in the magnet axis)
- at ambient temperature room level
What influences lifting capacity in practice
- Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
- Base massiveness – too thin plate causes magnetic saturation, causing part of the flux to be lost to the other side.
- Chemical composition of the base – mild steel gives the best results. Higher carbon content lower magnetic permeability and holding force.
- Smoothness – full contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
- Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.
Safe handling of NdFeB magnets
Do not overheat magnets
Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.
Caution required
Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.
Danger to pacemakers
Individuals with a pacemaker must keep an absolute distance from magnets. The magnetic field can interfere with the operation of the implant.
Machining danger
Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Crushing force
Risk of injury: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.
Danger to the youngest
Strictly store magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are very dangerous.
Metal Allergy
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease working with magnets and wear gloves.
Threat to navigation
Note: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a separation from your phone, tablet, and navigation systems.
Electronic devices
Data protection: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, medical aids, timepieces).
Magnet fragility
NdFeB magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them shattering into shards.
