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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 form of a neodymium magnet can be tested on our force calculator.

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Detailed specification - 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

Technical simulation of the assembly - data

Presented information represent the direct effect of a engineering calculation. Results were calculated on models for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Please consider these data as a reference point during assembly planning.

Table 1: Static force (pull vs gap) - interaction chart
MW 8x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5531 Gs
553.1 mT
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
strong
1 mm 4162 Gs
416.2 mT
1.15 kg / 2.53 pounds
1149.3 g / 11.3 N
low risk
2 mm 2984 Gs
298.4 mT
0.59 kg / 1.30 pounds
590.7 g / 5.8 N
low risk
3 mm 2107 Gs
210.7 mT
0.29 kg / 0.65 pounds
294.5 g / 2.9 N
low risk
5 mm 1084 Gs
108.4 mT
0.08 kg / 0.17 pounds
78.0 g / 0.8 N
low risk
10 mm 296 Gs
29.6 mT
0.01 kg / 0.01 pounds
5.8 g / 0.1 N
low risk
15 mm 118 Gs
11.8 mT
0.00 kg / 0.00 pounds
0.9 g / 0.0 N
low risk
20 mm 58 Gs
5.8 mT
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
low risk
30 mm 20 Gs
2.0 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk
50 mm 5 Gs
0.5 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
low risk

Table 2: Sliding hold (wall)
MW 8x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.41 kg / 0.90 pounds
406.0 g / 4.0 N
1 mm Stal (~0.2) 0.23 kg / 0.51 pounds
230.0 g / 2.3 N
2 mm Stal (~0.2) 0.12 kg / 0.26 pounds
118.0 g / 1.2 N
3 mm Stal (~0.2) 0.06 kg / 0.13 pounds
58.0 g / 0.6 N
5 mm Stal (~0.2) 0.02 kg / 0.04 pounds
16.0 g / 0.2 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 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 (sliding) - behavior on slippery surfaces
MW 8x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.61 kg / 1.34 pounds
609.0 g / 6.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.41 kg / 0.90 pounds
406.0 g / 4.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.20 kg / 0.45 pounds
203.0 g / 2.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.02 kg / 2.24 pounds
1015.0 g / 10.0 N

Table 4: Material efficiency (substrate influence) - power losses
MW 8x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.20 kg / 0.45 pounds
203.0 g / 2.0 N
1 mm
25%
0.51 kg / 1.12 pounds
507.5 g / 5.0 N
2 mm
50%
1.02 kg / 2.24 pounds
1015.0 g / 10.0 N
3 mm
75%
1.52 kg / 3.36 pounds
1522.5 g / 14.9 N
5 mm
100%
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
10 mm
100%
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
11 mm
100%
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
12 mm
100%
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N

Table 5: Thermal stability (material behavior) - power drop
MW 8x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
OK
40 °C -2.2% 1.99 kg / 4.38 pounds
1985.3 g / 19.5 N
OK
60 °C -4.4% 1.94 kg / 4.28 pounds
1940.7 g / 19.0 N
OK
80 °C -6.6% 1.90 kg / 4.18 pounds
1896.0 g / 18.6 N
100 °C -28.8% 1.45 kg / 3.19 pounds
1445.4 g / 14.2 N

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.48 kg / 20.90 pounds
6 000 Gs
1.42 kg / 3.14 pounds
1422 g / 14.0 N
N/A
1 mm 7.26 kg / 16.01 pounds
9 682 Gs
1.09 kg / 2.40 pounds
1089 g / 10.7 N
6.54 kg / 14.41 pounds
~0 Gs
2 mm 5.37 kg / 11.83 pounds
8 324 Gs
0.81 kg / 1.78 pounds
805 g / 7.9 N
4.83 kg / 10.65 pounds
~0 Gs
3 mm 3.88 kg / 8.55 pounds
7 074 Gs
0.58 kg / 1.28 pounds
582 g / 5.7 N
3.49 kg / 7.69 pounds
~0 Gs
5 mm 1.95 kg / 4.30 pounds
5 016 Gs
0.29 kg / 0.64 pounds
292 g / 2.9 N
1.75 kg / 3.87 pounds
~0 Gs
10 mm 0.36 kg / 0.80 pounds
2 169 Gs
0.05 kg / 0.12 pounds
55 g / 0.5 N
0.33 kg / 0.72 pounds
~0 Gs
20 mm 0.03 kg / 0.06 pounds
592 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
0.02 kg / 0.05 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
66 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
41 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
27 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
19 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
14 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
10 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Protective zones (electronics) - precautionary measures
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
Phone / Smartphone 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: Collisions (kinetic energy) - warning
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 (Flux)
MW 8x8 / N38

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

Table 11: Underwater work (magnet fishing)
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%
Warning: 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

*Note: On a vertical surface, the magnet retains merely a fraction of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) severely limits 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) = 0.89

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.

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: 010106-2026
Measurement Calculator
Pulling force

Magnetic Field

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The offered product is a very strong rod magnet, composed of modern NdFeB material, which, at dimensions of Ø8x8 mm, guarantees maximum efficiency. The MW 8x8 / N38 model boasts high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 2.03 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 19.92 N with a weight of only 3.02 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for the majority 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 (Ø8x8), 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 Ø8x8 mm, which, at a weight of 3.02 g, makes it an element with impressive magnetic energy density. 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 protects the surface against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 8 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • Their strength is durable, and after around 10 years it decreases only by ~1% (according to research),
  • They do not lose their magnetic properties even under close interference source,
  • By using a shiny coating of silver, the element has an proper look,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of accurate machining and adjusting to atypical conditions,
  • Key role in advanced technology sectors – they are utilized in mass storage devices, brushless drives, diagnostic systems, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Cons of neodymium magnets: tips and applications.
  • At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited possibility of creating nuts in the magnet and complex shapes - preferred is a housing - mounting mechanism.
  • Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Additionally, small components of these devices can complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Maximum holding power of the magnet – what it depends on?

The declared magnet strength refers to the limit force, recorded under optimal environment, namely:
  • using a base made of low-carbon steel, acting as a ideal flux conductor
  • whose thickness is min. 10 mm
  • characterized by lack of roughness
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction perpendicular to the plane
  • in stable room temperature

Practical aspects of lifting capacity – factors

During everyday use, the actual holding force results from several key aspects, presented from the most important:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin plate does not accept the full field, causing part of the flux to be escaped to the other side.
  • Material type – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
  • Smoothness – full contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate decreases the load capacity.

H&S for magnets
Do not give to children

NdFeB magnets are not suitable for play. Eating several magnets can lead to them attracting across intestines, which constitutes a direct threat to life and necessitates urgent medical intervention.

Hand protection

Protect your hands. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Phone sensors

GPS units and smartphones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Cards and drives

Device Safety: Neodymium magnets can damage payment cards and delicate electronics (heart implants, medical aids, timepieces).

Danger to pacemakers

Warning for patients: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.

Protective goggles

NdFeB magnets are ceramic materials, which means they are very brittle. Impact of two magnets will cause them shattering into shards.

Heat warning

Avoid heat. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Warning for allergy sufferers

It is widely known that nickel (the usual finish) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands and choose encased magnets.

Fire risk

Mechanical processing of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Do not underestimate power

Handle magnets consciously. Their huge power can surprise even professionals. Plan your moves and do not underestimate their force.

Danger! Details about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98