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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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Physical properties - 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 assembly - report

The following information constitute the outcome of a engineering calculation. Values rely on models for the material Nd2Fe14B. Actual performance may differ from theoretical values. Treat these data as a preliminary roadmap when designing systems.

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

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 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 (shearing) - vertical pull
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 (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 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: Working in heat (stability) - resistance threshold
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: Protective zones (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
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: Dynamics (cracking risk) - 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: Construction 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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Sliding resistance

*Note: On a vertical surface, the magnet retains only a fraction of its max power.

2. Steel saturation

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

3. Heat tolerance

*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.

Engineering data and GPSR
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
Force (pull)

Field Strength

View also offers

The presented product is a very strong cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø8x8 mm, guarantees the highest energy density. The MW 8x8 / N38 model is characterized by high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding 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 lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced sensors, and efficient filters, where maximum induction on a small surface counts. 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 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, anaerobic resins 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 key parameter here is the holding force amounting to approximately 2.03 kg (force ~19.92 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This rod magnet 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.

Pros and cons of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose magnetism, even during nearly 10 years – the reduction in strength is only ~1% (based on measurements),
  • They retain their magnetic properties even under strong external field,
  • By covering with a shiny coating of silver, the element presents an modern look,
  • Neodymium magnets achieve maximum magnetic induction on a small surface, 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...
  • Possibility of custom machining and adapting to concrete requirements,
  • Key role in electronics industry – they are used in hard drives, electric drive systems, medical devices, also industrial machines.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages

Characteristics of disadvantages of neodymium magnets: application proposals
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • 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.
  • We recommend a housing - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to expensive raw materials, their price is higher than average,

Pull force analysis

Magnetic strength at its maximum – what it depends on?

Information about lifting capacity was determined for ideal contact conditions, taking into account:
  • using a base made of low-carbon steel, functioning as a magnetic yoke
  • possessing a thickness of minimum 10 mm to avoid saturation
  • characterized by smoothness
  • under conditions of gap-free contact (metal-to-metal)
  • under axial application of breakaway force (90-degree angle)
  • in stable room temperature

Magnet lifting force in use – key factors

Real force is influenced by specific conditions, mainly (from priority):
  • Distance – the presence of any layer (rust, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.

Safe handling of neodymium magnets
Warning for heart patients

Individuals with a pacemaker must maintain an safe separation from magnets. The magnetism can disrupt the functioning of the implant.

Risk of cracking

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Powerful field

Use magnets with awareness. Their huge power can surprise even experienced users. Stay alert and do not underestimate their force.

Product not for children

Absolutely store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.

Hand protection

Large magnets can break fingers instantly. Under no circumstances put your hand between two strong magnets.

Allergy Warning

Medical facts indicate that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or opt for versions in plastic housing.

Permanent damage

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Magnetic interference

A powerful magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Keep magnets close to a device to prevent damaging the sensors.

Dust is flammable

Dust produced during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Electronic devices

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

Security! Looking for details? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98