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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

technical specifications »

1.341 ZŁ with VAT / pcs + price for transport

1.090 ZŁ net + 23% VAT / pcs

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Technical parameters 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 modeling of the assembly - technical parameters

The following data constitute the direct effect of a engineering analysis. Results were calculated on models for the class Nd2Fe14B. Operational performance may differ. Use these calculations as a supplementary guide when designing systems.

Table 1: Static pull 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 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
 weak grip
2 mm 2984 Gs
298.4 mT
 0.59 kg / 1.30 lbs
590.7 g / 5.8 N
 weak grip
3 mm 2107 Gs
210.7 mT
 0.29 kg / 0.65 lbs
294.5 g / 2.9 N
 weak grip
5 mm 1084 Gs
108.4 mT
 0.08 kg / 0.17 lbs
78.0 g / 0.8 N
 weak grip
10 mm 296 Gs
29.6 mT
 0.01 kg / 0.01 lbs
5.8 g / 0.1 N
 weak grip
15 mm 118 Gs
11.8 mT
 0.00 kg / 0.00 lbs
0.9 g / 0.0 N
 weak grip
20 mm 58 Gs
5.8 mT
 0.00 kg / 0.00 lbs
0.2 g / 0.0 N
 weak grip
30 mm 20 Gs
2.0 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
50 mm 5 Gs
0.5 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Pulling power drops drastically with every mm of distance. Remember that even a microscopic distance (e.g., dirt, paint, dust) significantly weakens the grip. Neodymiums operate strongest during direct contact; gap weakens the power. Observe how rapidly the pull force fall, when the product does not touch flatly to the metal substrate. When designing the arrangement, eliminate redundant distances.

Table 2: Slippage 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 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
This section presents the theoretical holding capacity needed to initiate the downward movement of the magnet vertically along a vertical metal surface (considering typical friction coefficient). This parameter is relative to the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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
When hanging a element on a upright surface (e.g., a car body), it will maintain only approx. 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient influence the fact that products move down easier than they pull off. Planning a vertical fastening? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will slip down under a much lighter weight. Application of an anti-slip pad can drastically increase the grip.

Table 4: Material efficiency (saturation) - 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
A too thin steel is incapable of conduct the full magnetic flux, which wastes potential of the magnet. If you install a neodymium to a weak sheet, the magnetism will pass right through and the holding will be smaller. To squeeze the maximum of this magnet's power, you need a suitably thick element of metal. The saturation effect means that on delicate walls (e.g., car bodies), the holder holds weaker. We suggest choosing the steel thickness based on the following data.

Table 5: Working in heat (material behavior) - 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 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
Standard neodymium magnets irreversibly lose strength past the thermal threshold. Watch out for overheating – high temperature can irreversibly destroy this magnet. With increasing heat, the neodymium's capacity temporarily drops. Refrain from using this magnet close to ovens higher than its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) risk losing magnetic properties under lower heat stress than long magnets. The danger warning in the table indicates a risk of irreversible loss for this particular item.

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
Two strong neodymiums attract each other from a much further distance than a magnet and steel setup. The connection of two magnets produces a massive flux and a larger range of performance. Planning to create a strong closure? Apply two magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the impact force is massive. The repulsion force is marginally weaker than the connection force, but still significant.
*Flux density between like poles is approximately ~0 Gs at the geometric center between the magnets (due to field cancellation).
Important: Calculations show friction force of two identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (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
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
A strong magnetic field poses a serious hazard to electronic devices as well as pacemakers. These neodymiums produce a flux that prevents correct functioning of digital equipment. Be aware: the invisible magnetic field acts through matter and plastic. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (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
Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product during mounting so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the magnet. Wear safety glasses when playing with powerful specimens.

Table 9: Surface protection spec
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Flux value passing through the pole surface. Essential parameter when building generators as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Warning: On a vertical surface, the magnet holds just a fraction of its perpendicular strength.

2. Efficiency vs thickness

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

3. Thermal stability

*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%
Environmental data
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
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This product is an incredibly powerful rod magnet, manufactured from modern NdFeB material, which, with dimensions of Ø8x8 mm, guarantees maximum efficiency. This specific item features high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 2.03 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, 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 electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets N38 are strong enough for the majority 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.
This model is characterized by dimensions Ø8x8 mm, which, at a weight of 3.02 g, makes it an element with high 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 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. 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 neodymium magnets.

Advantages

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • They have stable power, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They possess excellent resistance to magnetic field loss due to external magnetic sources,
  • By covering with a shiny layer of nickel, the element presents an aesthetic look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of precise shaping and optimizing to atypical conditions,
  • Fundamental importance in modern technologies – they serve a role in mass storage devices, drive modules, precision medical tools, also technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually 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.
  • Due to limitations in realizing nuts and complex forms in magnets, we propose using a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these devices can be problematic in diagnostics medical after entering the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Holding force characteristics

Detachment force of the magnet in optimal conditions – what contributes to it?

The lifting capacity listed is a result of laboratory testing executed under specific, ideal conditions:
  • with the contact of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • whose transverse dimension equals approx. 10 mm
  • with a plane perfectly flat
  • without the slightest clearance between the magnet and steel
  • under vertical force direction (90-degree angle)
  • at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is influenced by working environment parameters, including (from priority):
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Material composition – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
  • Smoothness – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal factor – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. In addition, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

H&S for magnets
Magnet fragility

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

Demagnetization risk

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Phone sensors

A strong magnetic field interferes with the functioning of magnetometers in smartphones and GPS navigation. Keep magnets near a smartphone to prevent damaging the sensors.

Safe operation

Handle magnets with awareness. Their huge power can shock even experienced users. Plan your moves and do not underestimate their power.

Protect data

Powerful magnetic fields can destroy records on credit cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Implant safety

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Hand protection

Large magnets can crush fingers in a fraction of a second. Under no circumstances place your hand between two attracting surfaces.

Do not drill into magnets

Drilling and cutting of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Avoid contact if allergic

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness happens, immediately stop working with magnets and use protective gear.

No play value

Only for adults. Small elements pose a choking risk, leading to severe trauma. Store out of reach of children and animals.

Security! Need more info? Check our post: Are neodymium magnets dangerous?