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MW 5x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010088

GTIN/EAN: 5906301810872

5.00
Load capacity 0.45 kg / 4.40 N Magnetic Induction 616.32 mT / 6163 Gs
Diameter Ø
5 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
4.42 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

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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
properties values
Cat. no. 010088
GTIN/EAN 5906301810872
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
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

Specification / characteristics MW 5x30 / N38 - cylindrical magnet
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

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
10%
0.05 kg / 0.10 LBS
45.0 g / 0.4 N
1 mm
25%
0.11 kg / 0.25 LBS
112.5 g / 1.1 N
2 mm
50%
0.23 kg / 0.50 LBS
225.0 g / 2.2 N
3 mm
75%
0.34 kg / 0.74 LBS
337.5 g / 3.3 N
5 mm
100%
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
10 mm
100%
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
11 mm
100%
0.45 kg / 0.99 LBS
450.0 g / 4.4 N
12 mm
100%
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

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.

Technical specification and ecology

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
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 010088-2026
Measurement Calculator

Magnet pull force


Field Strength

Other products

This product is an exceptionally strong cylinder magnet, composed of advanced NdFeB material, which, at dimensions of Ø5x30 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 0.45 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. Thanks to the pull force of 4.40 N with a weight of only 4.42 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø5x30), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 5 mm and height 30 mm. The key parameter here is the lifting capacity amounting to approximately 0.45 kg (force ~4.40 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 30 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths and weaknesses of Nd2Fe14B magnets.

Advantages

Apart from their strong magnetic energy, neodymium magnets have these key benefits:
  • 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

What to avoid - cons of neodymium magnets: tips and applications.
  • 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 magnetwhat it depends on?

Breakaway force is the result of a measurement for ideal contact conditions, including:
  • 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

Please note that the magnet holding will differ subject to elements below, in order of importance:
  • 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.

Danger! Want to know more? Read our article: Why are neodymium magnets dangerous?