Neodymiums – wide shape selection

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Magnet fishing: strong F200/F400 sets

Discover your passion related to seabed exploration! Our specialized grips (F200, F400) provide safety guarantee and immense power. Solid, corrosion-resistant housing and strong lines will perform in rivers and lakes.

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Reliable solutions for fixing non-invasive. Threaded grips (M8, M10, M12) provide instant organization of work on production halls. They are indispensable installing lamps, sensors and banners.

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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 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 modeling of the magnet - technical parameters

The following values constitute the direct effect of a physical simulation. Values rely on algorithms for the class Nd2Fe14B. Real-world parameters may deviate from the simulation results. Treat these calculations as a reference point when designing systems.

Table 1: Static pull force (force vs gap) - characteristics
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
warning
1 mm 4162 Gs
416.2 mT
1.15 kg / 2.53 pounds
1149.3 g / 11.3 N
safe
2 mm 2984 Gs
298.4 mT
0.59 kg / 1.30 pounds
590.7 g / 5.8 N
safe
3 mm 2107 Gs
210.7 mT
0.29 kg / 0.65 pounds
294.5 g / 2.9 N
safe
5 mm 1084 Gs
108.4 mT
0.08 kg / 0.17 pounds
78.0 g / 0.8 N
safe
10 mm 296 Gs
29.6 mT
0.01 kg / 0.01 pounds
5.8 g / 0.1 N
safe
15 mm 118 Gs
11.8 mT
0.00 kg / 0.00 pounds
0.9 g / 0.0 N
safe
20 mm 58 Gs
5.8 mT
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
safe
30 mm 20 Gs
2.0 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 load (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 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: Vertical assembly (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: Steel thickness (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 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 (stability) - thermal limit
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: Magnet-Magnet interaction (attraction) - field collision
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 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: Hazards (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
Mobile device 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: 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: Construction 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: 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%
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 wall, the magnet retains just ~20% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Thermal stability

*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

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
Magnet Unit Converter
Force (pull)

Field Strength

Other deals

The offered product is a very strong rod magnet, composed of advanced NdFeB material, which, at dimensions of Ø8x8 mm, guarantees optimal power. This specific item features high dimensional repeatability 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 warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, 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 electronics and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. 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 in continuous sale 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 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.

Strengths and weaknesses of rare earth magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • Magnets very well resist against loss of magnetization caused by external fields,
  • In other words, due to the reflective layer of silver, the element becomes visually attractive,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of individual forming and adapting to concrete requirements,
  • Huge importance in modern technologies – they are used in data components, electric drive systems, diagnostic systems, as well as technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in miniature devices

Limitations

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets demagnetize 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 start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of creating nuts in the magnet and complicated forms - recommended is a housing - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Additionally, small elements of these magnets are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting force for a neodymium magnet – what affects it?

The force parameter is a measurement result performed under standard conditions:
  • using a sheet made of low-carbon steel, acting as a circuit closing element
  • with a thickness of at least 10 mm
  • with a plane perfectly flat
  • under conditions of no distance (surface-to-surface)
  • during pulling in a direction perpendicular to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Real force is affected by specific conditions, such as (from most important):
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Metal type – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Surface finish – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safe handling of neodymium magnets
Keep away from electronics

GPS units and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.

Caution required

Be careful. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can move away.

Electronic hazard

Data protection: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Beware of splinters

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

Medical implants

Individuals with a ICD should keep an large gap from magnets. The magnetism can stop the functioning of the implant.

Do not drill into magnets

Dust created during machining of magnets is flammable. Avoid drilling into magnets unless you are an expert.

Crushing risk

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

Do not give to children

Only for adults. Small elements can be swallowed, leading to severe trauma. Store away from children and animals.

Operating temperature

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Warning for allergy sufferers

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness occurs, immediately stop handling magnets and use protective gear.

Important! Looking for details? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98