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MW 5x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010088

GTIN/EAN: 5906301810872

5.00

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

3.57 with VAT / pcs + price for transport

2.90 ZŁ net + 23% VAT / pcs

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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 analysis of the magnet - report

Presented values represent the result of a physical analysis. Results are based on algorithms for the material Nd2Fe14B. Operational parameters may differ. Please consider these data as a reference point for designers.

Table 1: Static pull force (pull vs distance) - power drop
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 pounds
450.0 g / 4.4 N
safe
1 mm 3877 Gs
387.7 mT
0.18 kg / 0.39 pounds
178.6 g / 1.8 N
safe
2 mm 2308 Gs
230.8 mT
0.06 kg / 0.14 pounds
63.3 g / 0.6 N
safe
3 mm 1419 Gs
141.9 mT
0.02 kg / 0.05 pounds
23.9 g / 0.2 N
safe
5 mm 639 Gs
63.9 mT
0.00 kg / 0.01 pounds
4.8 g / 0.0 N
safe
10 mm 173 Gs
17.3 mT
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
safe
15 mm 75 Gs
7.5 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
safe
20 mm 40 Gs
4.0 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
30 mm 16 Gs
1.6 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
50 mm 5 Gs
0.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

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 pounds
90.0 g / 0.9 N
1 mm Stal (~0.2) 0.04 kg / 0.08 pounds
36.0 g / 0.4 N
2 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 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: 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 pounds
135.0 g / 1.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.09 kg / 0.20 pounds
90.0 g / 0.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.05 kg / 0.10 pounds
45.0 g / 0.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.23 kg / 0.50 pounds
225.0 g / 2.2 N

Table 4: Steel thickness (saturation) - 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 pounds
45.0 g / 0.4 N
1 mm
25%
0.11 kg / 0.25 pounds
112.5 g / 1.1 N
2 mm
50%
0.23 kg / 0.50 pounds
225.0 g / 2.2 N
3 mm
75%
0.34 kg / 0.74 pounds
337.5 g / 3.3 N
5 mm
100%
0.45 kg / 0.99 pounds
450.0 g / 4.4 N
10 mm
100%
0.45 kg / 0.99 pounds
450.0 g / 4.4 N
11 mm
100%
0.45 kg / 0.99 pounds
450.0 g / 4.4 N
12 mm
100%
0.45 kg / 0.99 pounds
450.0 g / 4.4 N

Table 5: Working in heat (material behavior) - 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 pounds
450.0 g / 4.4 N
OK
40 °C -2.2% 0.44 kg / 0.97 pounds
440.1 g / 4.3 N
OK
60 °C -4.4% 0.43 kg / 0.95 pounds
430.2 g / 4.2 N
OK
80 °C -6.6% 0.42 kg / 0.93 pounds
420.3 g / 4.1 N
100 °C -28.8% 0.32 kg / 0.71 pounds
320.4 g / 3.1 N

Table 6: Two magnets (repulsion) - forces in the system
MW 5x30 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.58 kg / 10.11 pounds
6 170 Gs
0.69 kg / 1.52 pounds
688 g / 6.7 N
N/A
1 mm 2.98 kg / 6.57 pounds
9 927 Gs
0.45 kg / 0.99 pounds
447 g / 4.4 N
2.68 kg / 5.92 pounds
~0 Gs
2 mm 1.82 kg / 4.01 pounds
7 755 Gs
0.27 kg / 0.60 pounds
273 g / 2.7 N
1.64 kg / 3.61 pounds
~0 Gs
3 mm 1.08 kg / 2.39 pounds
5 981 Gs
0.16 kg / 0.36 pounds
162 g / 1.6 N
0.97 kg / 2.15 pounds
~0 Gs
5 mm 0.39 kg / 0.86 pounds
3 595 Gs
0.06 kg / 0.13 pounds
59 g / 0.6 N
0.35 kg / 0.78 pounds
~0 Gs
10 mm 0.05 kg / 0.11 pounds
1 278 Gs
0.01 kg / 0.02 pounds
7 g / 0.1 N
0.04 kg / 0.10 pounds
~0 Gs
20 mm 0.00 kg / 0.01 pounds
346 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
49 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
32 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
22 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
16 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
12 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
9 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Hazards (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
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: Collisions (kinetic energy) - warning
MW 5x30 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 10.18 km/h
(2.83 m/s)
0.02 J
30 mm 17.63 km/h
(4.90 m/s)
0.05 J
50 mm 22.75 km/h
(6.32 m/s)
0.09 J
100 mm 32.18 km/h
(8.94 m/s)
0.18 J

Table 9: Coating parameters (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: Submerged application
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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

*Note: On a vertical surface, the magnet retains only ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Temperature resistance

*For standard magnets, 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

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.

Engineering data and GPSR
Material specification
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%
Sustainability
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: 010088-2025
Measurement Calculator
Force (pull)

Field Strength

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The offered product is an exceptionally strong rod magnet, manufactured from durable NdFeB material, which, at dimensions of Ø5x30 mm, guarantees maximum efficiency. The MW 5x30 / N38 model boasts high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 0.45 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 4.40 N with a weight of only 4.42 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 5.1 mm) using epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating 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 warehouse.
This model is characterized by dimensions Ø5x30 mm, which, at a weight of 4.42 g, makes it an element with high magnetic energy density. The key parameter here is the holding force 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 protects the surface against external factors, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 5 mm. 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 through the diameter if your project requires it.

Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • They retain full power for almost ten years – the loss is just ~1% (based on simulations),
  • Magnets very well defend themselves against loss of magnetization caused by foreign field sources,
  • A magnet with a metallic silver surface looks better,
  • Magnetic induction on the surface of the magnet remains exceptional,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to flexibility in forming and the ability to customize to complex applications,
  • Fundamental importance in modern technologies – they are utilized in data components, electromotive mechanisms, precision medical tools, also other advanced devices.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Cons of neodymium magnets and ways of using them
  • At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum holding power of the magnet – what contributes to it?

Holding force of 0.45 kg is a measurement result performed under standard conditions:
  • using a sheet made of high-permeability steel, acting as a magnetic yoke
  • whose thickness is min. 10 mm
  • characterized by smoothness
  • with total lack of distance (without paint)
  • under axial force vector (90-degree angle)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

Bear in mind that the magnet holding will differ subject to the following factors, in order of importance:
  • Distance (between the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Steel type – low-carbon steel gives the best results. Alloy steels reduce magnetic permeability and lifting capacity.
  • Plate texture – smooth surfaces ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity was measured using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with neodymium magnets
Magnet fragility

Neodymium magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets leads to them shattering into small pieces.

Maximum temperature

Do not overheat. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Magnetic media

Very strong magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Do not drill into magnets

Dust produced during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

GPS Danger

Remember: rare earth magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your phone, tablet, and navigation systems.

Safe operation

Use magnets with awareness. Their huge power can shock even professionals. Be vigilant and respect their force.

Danger to pacemakers

Medical warning: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

Keep away from children

Absolutely store magnets out of reach of children. Ingestion danger is high, and the effects of magnets connecting inside the body are life-threatening.

Hand protection

Pinching hazard: The pulling power is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Sensitization to coating

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness appears, immediately stop working with magnets and wear gloves.

Security! Need more info? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98