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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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Technical of the product - 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

Engineering analysis of the magnet - report

The following information constitute the direct effect of a engineering calculation. Values were calculated on algorithms for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Please consider these data as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - power drop
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 lbs
2030.0 g / 19.9 N
medium risk
1 mm 4162 Gs
416.2 mT
1.15 kg / 2.53 lbs
1149.3 g / 11.3 N
safe
2 mm 2984 Gs
298.4 mT
0.59 kg / 1.30 lbs
590.7 g / 5.8 N
safe
3 mm 2107 Gs
210.7 mT
0.29 kg / 0.65 lbs
294.5 g / 2.9 N
safe
5 mm 1084 Gs
108.4 mT
0.08 kg / 0.17 lbs
78.0 g / 0.8 N
safe
10 mm 296 Gs
29.6 mT
0.01 kg / 0.01 lbs
5.8 g / 0.1 N
safe
15 mm 118 Gs
11.8 mT
0.00 kg / 0.00 lbs
0.9 g / 0.0 N
safe
20 mm 58 Gs
5.8 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
safe
30 mm 20 Gs
2.0 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe
50 mm 5 Gs
0.5 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.41 kg / 0.90 lbs
406.0 g / 4.0 N
1 mm Stal (~0.2) 0.23 kg / 0.51 lbs
230.0 g / 2.3 N
2 mm Stal (~0.2) 0.12 kg / 0.26 lbs
118.0 g / 1.2 N
3 mm Stal (~0.2) 0.06 kg / 0.13 lbs
58.0 g / 0.6 N
5 mm Stal (~0.2) 0.02 kg / 0.04 lbs
16.0 g / 0.2 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 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 (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 lbs
609.0 g / 6.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.41 kg / 0.90 lbs
406.0 g / 4.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.20 kg / 0.45 lbs
203.0 g / 2.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.02 kg / 2.24 lbs
1015.0 g / 10.0 N

Table 4: Material efficiency (saturation) - sheet metal selection
MW 8x8 / N38

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

Table 5: Thermal resistance (stability) - 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 lbs
2030.0 g / 19.9 N
OK
40 °C -2.2% 1.99 kg / 4.38 lbs
1985.3 g / 19.5 N
OK
60 °C -4.4% 1.94 kg / 4.28 lbs
1940.7 g / 19.0 N
OK
80 °C -6.6% 1.90 kg / 4.18 lbs
1896.0 g / 18.6 N
100 °C -28.8% 1.45 kg / 3.19 lbs
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) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.48 kg / 20.90 lbs
6 000 Gs
1.42 kg / 3.14 lbs
1422 g / 14.0 N
N/A
1 mm 7.26 kg / 16.01 lbs
9 682 Gs
1.09 kg / 2.40 lbs
1089 g / 10.7 N
6.54 kg / 14.41 lbs
~0 Gs
2 mm 5.37 kg / 11.83 lbs
8 324 Gs
0.81 kg / 1.78 lbs
805 g / 7.9 N
4.83 kg / 10.65 lbs
~0 Gs
3 mm 3.88 kg / 8.55 lbs
7 074 Gs
0.58 kg / 1.28 lbs
582 g / 5.7 N
3.49 kg / 7.69 lbs
~0 Gs
5 mm 1.95 kg / 4.30 lbs
5 016 Gs
0.29 kg / 0.64 lbs
292 g / 2.9 N
1.75 kg / 3.87 lbs
~0 Gs
10 mm 0.36 kg / 0.80 lbs
2 169 Gs
0.05 kg / 0.12 lbs
55 g / 0.5 N
0.33 kg / 0.72 lbs
~0 Gs
20 mm 0.03 kg / 0.06 lbs
592 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
0.02 kg / 0.05 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
66 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
41 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
27 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
19 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
14 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
10 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Safety (HSE) (implants) - 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
Timepiece 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Car key 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: Dynamics (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: Submerged application
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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.

3. Temperature resistance

*For N38 material, 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

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 and environmental data
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
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Magnet pull force

Magnetic Field

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The presented product is an extremely powerful cylindrical magnet, produced from modern NdFeB material, which, with dimensions of Ø8x8 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 2.03 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 19.92 N with a weight of only 3.02 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using epoxy glues. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets N38 are suitable for 90% of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger 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.
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. 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.

Pros

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
  • They feature excellent resistance to weakening of magnetic properties as a result of external fields,
  • In other words, due to the shiny surface of gold, the element gains a professional look,
  • Neodymium magnets create maximum magnetic induction on a small area, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in designing and the ability to adapt to client solutions,
  • Universal use in future technologies – they find application in mass storage devices, electric motors, medical devices, and complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their power 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in producing threads and complicated shapes in magnets, we recommend using a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Highest magnetic holding forcewhat affects it?

The specified lifting capacity concerns the maximum value, recorded under optimal environment, specifically:
  • using a sheet made of low-carbon steel, serving as a magnetic yoke
  • possessing a thickness of minimum 10 mm to avoid saturation
  • with an ideally smooth contact surface
  • under conditions of no distance (surface-to-surface)
  • under axial force vector (90-degree angle)
  • at conditions approx. 20°C

Determinants of practical lifting force of a magnet

Holding efficiency is influenced by specific conditions, mainly (from priority):
  • Distance – the presence of foreign body (paint, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Plate material – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and lifting capacity.
  • Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, in contrast under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Electronic devices

Avoid bringing magnets near a purse, computer, or TV. The magnetism can destroy these devices and erase data from cards.

Bodily injuries

Large magnets can break fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Impact on smartphones

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can permanently damage the internal compass in your phone.

Allergy Warning

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, immediately stop working with magnets and use protective gear.

Thermal limits

Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.

Mechanical processing

Fire warning: Neodymium dust is explosive. Do not process magnets in home conditions as this risks ignition.

Danger to pacemakers

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Danger to the youngest

Only for adults. Tiny parts pose a choking risk, causing serious injuries. Store away from kids and pets.

Caution required

Exercise caution. Neodymium magnets act from a distance and snap with huge force, often faster than you can move away.

Protective goggles

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets leads to them cracking into small pieces.

Security! More info about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98