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MW 8x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010106

GTIN/EAN: 5906301811053

5.00
Load capacity 2.03 kg / 19.92 N Magnetic Induction 553.67 mT / 5537 Gs
Diameter Ø
8 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
3.02 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Lifting power along with structure of magnetic components can be analyzed on our force calculator.

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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

Technical simulation of the product - report

Presented values represent the result of a physical simulation. Values are based on models for the material Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Use these calculations as a reference point when designing systems.

Table 1: Static force (force vs gap) - 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 pounds
2030.0 g / 19.9 N
medium risk
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: Vertical force (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: Steel thickness (substrate influence) - 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 resistance (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: Two magnets (repulsion) - field range
MW 8x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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: 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
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 (kinetic energy) - warning
MW 8x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.64 km/h
(4.62 m/s)
0.03 J
30 mm 16.68 km/h
(4.63 m/s)
0.03 J
50 mm 16.68 km/h
(4.63 m/s)
0.03 J
100 mm 16.68 km/h
(4.63 m/s)
0.03 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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

1. Sliding resistance

*Caution: On a vertical surface, the magnet retains just approx. 20-30% of its max power.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Heat tolerance

*For N38 material, the safety limit 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.

Engineering data and GPSR

Elemental analysis

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: 010106-2026
Magnet Unit Converter

Pulling force


Magnetic Induction

Other products

This product is an extremely powerful cylindrical magnet, made from durable NdFeB material, which, at dimensions of Ø8x8 mm, guarantees optimal power. This specific item is characterized by high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 2.03 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Moreover, 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 finds application in modeling, 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 low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, 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 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 strong enough for the majority of applications in modeling 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 in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 8 mm. The key parameter here is the holding force amounting to approximately 2.03 kg (force ~19.92 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, 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. Such an arrangement is most desirable 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 through the diameter if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose strength, even during around 10 years – the decrease in strength is only ~1% (based on measurements),
  • Neodymium magnets are characterized by remarkably resistant to demagnetization caused by external interference,
  • Thanks to the shiny finish, the surface of nickel, gold-plated, or silver-plated gives an elegant appearance,
  • They show high magnetic induction at the operating surface, which increases their power,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise forming as well as adapting to individual conditions,
  • Universal use in innovative solutions – they serve a role in magnetic memories, electric drive systems, precision medical tools, as well as modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited possibility of making nuts in the magnet and complex shapes - preferred is casing - magnetic holder.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, 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

Pull force analysis

Highest magnetic holding forcewhat it depends on?

Information about lifting capacity is the result of a measurement for ideal contact conditions, including:
  • using a base made of low-carbon steel, functioning as a ideal flux conductor
  • possessing a thickness of min. 10 mm to avoid saturation
  • with a surface perfectly flat
  • without the slightest air gap between the magnet and steel
  • under axial force vector (90-degree angle)
  • at ambient temperature room level

Key elements affecting lifting force

Real force is affected by specific conditions, such as (from most important):
  • Clearance – existence of foreign body (paint, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Adults only

Product intended for adults. Tiny parts can be swallowed, leading to serious injuries. Keep out of reach of children and animals.

Health Danger

Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Threat to navigation

GPS units and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Crushing force

Big blocks can crush fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Beware of splinters

Beware of splinters. Magnets can fracture upon violent connection, ejecting shards into the air. We recommend safety glasses.

Do not overheat magnets

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

Do not drill into magnets

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

Avoid contact if allergic

Certain individuals suffer from a sensitization to Ni, which is the common plating for NdFeB magnets. Prolonged contact may cause skin redness. It is best to wear safety gloves.

Threat to electronics

Do not bring magnets close to a purse, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

Conscious usage

Use magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and do not underestimate their power.

Safety First! Learn more about hazards in the article: Magnet Safety Guide.