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MW 8x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010106

GTIN/EAN: 5906301811053

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

3.02 g

Magnetization Direction

↑ axial

Load capacity

2.03 kg / 19.92 N

Magnetic Induction

553.67 mT / 5537 Gs

Coating

[NiCuNi] Nickel

1.341 with VAT / pcs + price for transport

1.090 ZŁ net + 23% VAT / pcs

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Parameters along with structure of a neodymium magnet can be estimated with our force calculator.

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Technical parameters - MW 8x8 / N38 - cylindrical magnet

Specification / characteristics - MW 8x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010106
GTIN/EAN 5906301811053
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 8 mm [±0,1 mm]
Height 8 mm [±0,1 mm]
Weight 3.02 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.03 kg / 19.92 N
Magnetic Induction ~ ? 553.67 mT / 5537 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x8 / 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

Physical simulation of the product - data

Presented values constitute the result of a engineering calculation. Results rely on algorithms for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Use these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs distance) - power drop
MW 8x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 5531 Gs
553.1 mT
2.03 kg / 2030.0 g
19.9 N
strong
1 mm 4162 Gs
416.2 mT
1.15 kg / 1149.3 g
11.3 N
safe
2 mm 2984 Gs
298.4 mT
0.59 kg / 590.7 g
5.8 N
safe
3 mm 2107 Gs
210.7 mT
0.29 kg / 294.5 g
2.9 N
safe
5 mm 1084 Gs
108.4 mT
0.08 kg / 78.0 g
0.8 N
safe
10 mm 296 Gs
29.6 mT
0.01 kg / 5.8 g
0.1 N
safe
15 mm 118 Gs
11.8 mT
0.00 kg / 0.9 g
0.0 N
safe
20 mm 58 Gs
5.8 mT
0.00 kg / 0.2 g
0.0 N
safe
30 mm 20 Gs
2.0 mT
0.00 kg / 0.0 g
0.0 N
safe
50 mm 5 Gs
0.5 mT
0.00 kg / 0.0 g
0.0 N
safe

Table 2: Shear force (vertical surface)
MW 8x8 / N38

Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 0.41 kg / 406.0 g
4.0 N
1 mm Stal (~0.2) 0.23 kg / 230.0 g
2.3 N
2 mm Stal (~0.2) 0.12 kg / 118.0 g
1.2 N
3 mm Stal (~0.2) 0.06 kg / 58.0 g
0.6 N
5 mm Stal (~0.2) 0.02 kg / 16.0 g
0.2 N
10 mm Stal (~0.2) 0.00 kg / 2.0 g
0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.0 g
0.0 N

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 8x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.61 kg / 609.0 g
6.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.41 kg / 406.0 g
4.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.20 kg / 203.0 g
2.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.02 kg / 1015.0 g
10.0 N

Table 4: Steel thickness (saturation) - power losses
MW 8x8 / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.20 kg / 203.0 g
2.0 N
1 mm
25%
0.51 kg / 507.5 g
5.0 N
2 mm
50%
1.02 kg / 1015.0 g
10.0 N
5 mm
100%
2.03 kg / 2030.0 g
19.9 N
10 mm
100%
2.03 kg / 2030.0 g
19.9 N

Table 5: Thermal stability (material behavior) - resistance threshold
MW 8x8 / N38

Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 2.03 kg / 2030.0 g
19.9 N
OK
40 °C -2.2% 1.99 kg / 1985.3 g
19.5 N
OK
60 °C -4.4% 1.94 kg / 1940.7 g
19.0 N
OK
80 °C -6.6% 1.90 kg / 1896.0 g
18.6 N
100 °C -28.8% 1.45 kg / 1445.4 g
14.2 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 8x8 / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 9.48 kg / 9481 g
93.0 N
6 000 Gs
N/A
1 mm 7.26 kg / 7262 g
71.2 N
9 682 Gs
6.54 kg / 6536 g
64.1 N
~0 Gs
2 mm 5.37 kg / 5368 g
52.7 N
8 324 Gs
4.83 kg / 4831 g
47.4 N
~0 Gs
3 mm 3.88 kg / 3877 g
38.0 N
7 074 Gs
3.49 kg / 3489 g
34.2 N
~0 Gs
5 mm 1.95 kg / 1949 g
19.1 N
5 016 Gs
1.75 kg / 1754 g
17.2 N
~0 Gs
10 mm 0.36 kg / 364 g
3.6 N
2 169 Gs
0.33 kg / 328 g
3.2 N
~0 Gs
20 mm 0.03 kg / 27 g
0.3 N
592 Gs
0.02 kg / 24 g
0.2 N
~0 Gs
50 mm 0.00 kg / 0 g
0.0 N
66 Gs
0.00 kg / 0 g
0.0 N
~0 Gs

Table 7: Hazards (implants) - warnings
MW 8x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.5 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Mobile device 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (cracking risk) - collision effects
MW 8x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 26.19 km/h
(7.28 m/s)
0.08 J
30 mm 45.29 km/h
(12.58 m/s)
0.24 J
50 mm 58.47 km/h
(16.24 m/s)
0.40 J
100 mm 82.68 km/h
(22.97 m/s)
0.80 J

Table 9: Anti-corrosion coating durability
MW 8x8 / 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 8x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 868 Mx 28.7 µWb
Pc Coefficient 0.89 High (Stable)

Table 11: Physics of underwater searching
MW 8x8 / N38

Environment Effective steel pull Effect
Air (land) 2.03 kg Standard
Water (riverbed) 2.32 kg
(+0.29 kg Buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Shear force

*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its max power.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) severely limits 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

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
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%
Ecology and recycling (GPSR)
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: 010106-2025
Quick Unit Converter
Force (pull)

Magnetic Induction

Other offers

This product is an incredibly powerful rod magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø8x8 mm, guarantees optimal power. The MW 8x8 / N38 component is characterized by a tolerance of ±0.1mm and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 2.03 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 19.92 N with a weight of only 3.02 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure stability in automation, 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 excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø8x8), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 8 mm. The value of 19.92 N means that the magnet is capable of holding a weight many times exceeding its own mass of 3.02 g. The product has a [NiCuNi] coating, which secures it 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 8 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 diametrically if your project requires it.

Pros and cons of rare earth magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • Their power is durable, and after around 10 years it decreases only by ~1% (according to research),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • In other words, due to the aesthetic layer of gold, the element looks attractive,
  • Magnets are distinguished by huge magnetic induction on the outer side,
  • 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...
  • Due to the possibility of precise forming and adaptation to unique needs, NdFeB magnets can be manufactured in a variety of geometric configurations, which makes them more universal,
  • Universal use in innovative solutions – they serve a role in data components, electromotive mechanisms, diagnostic systems, as well as other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their strength 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
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complicated forms in magnets, we propose using casing - magnetic holder.
  • Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these devices can complicate diagnosis 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 magnetic pulling forcewhat it depends on?

The force parameter is a theoretical maximum value executed under standard conditions:
  • using a base made of low-carbon steel, acting as a circuit closing element
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with an ideally smooth contact surface
  • with direct contact (no paint)
  • for force acting at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

In real-world applications, the real power is determined by several key aspects, ranked from crucial:
  • Air gap (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Base massiveness – insufficiently thick steel does not close the flux, causing part of the power to be wasted to the other side.
  • Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
  • Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet and the plate reduces the holding force.

Precautions when working with neodymium magnets
Warning for allergy sufferers

It is widely known that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, avoid direct skin contact or choose coated magnets.

Dust is flammable

Powder generated during grinding of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Do not overheat magnets

Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

Magnetic media

Device Safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

GPS and phone interference

An intense magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Maintain magnets near a device to avoid damaging the sensors.

Warning for heart patients

Warning for patients: Powerful magnets affect electronics. Keep at least 30 cm distance or request help to handle the magnets.

Protective goggles

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching shards into the air. Wear goggles.

Bodily injuries

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!

Swallowing risk

Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Store out of reach of children and animals.

Do not underestimate power

Use magnets consciously. Their powerful strength can surprise even professionals. Plan your moves and respect their force.

Warning! Want to know more? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98