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MW 8x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010105

GTIN/EAN: 5906301811046

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

1.88 g

Magnetization Direction

↑ axial

Load capacity

2.17 kg / 21.31 N

Magnetic Induction

483.41 mT / 4834 Gs

Coating

[NiCuNi] Nickel

product parameters »

0.836 ZŁ with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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Parameters as well as shape of neodymium magnets can be reviewed with our magnetic calculator.

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Detailed specification - MW 8x5 / N38 - cylindrical magnet

Specification / characteristics - MW 8x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010105
GTIN/EAN 5906301811046
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 5 mm [±0,1 mm]
Weight 1.88 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.17 kg / 21.31 N
Magnetic Induction ~ ? 483.41 mT / 4834 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x5 / 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

Physical simulation of the product - technical parameters

These information are the direct effect of a physical calculation. Results rely on algorithms for the class Nd2Fe14B. Real-world parameters may differ. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
MW 8x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4830 Gs
483.0 mT
 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
 warning
1 mm 3655 Gs
365.5 mT
 1.24 kg / 2.74 LBS
1242.8 g / 12.2 N
 safe
2 mm 2610 Gs
261.0 mT
 0.63 kg / 1.40 LBS
633.9 g / 6.2 N
 safe
3 mm 1825 Gs
182.5 mT
 0.31 kg / 0.68 LBS
310.0 g / 3.0 N
 safe
5 mm 915 Gs
91.5 mT
 0.08 kg / 0.17 LBS
77.9 g / 0.8 N
 safe
10 mm 234 Gs
23.4 mT
 0.01 kg / 0.01 LBS
5.1 g / 0.1 N
 safe
15 mm 89 Gs
8.9 mT
 0.00 kg / 0.00 LBS
0.7 g / 0.0 N
 safe
20 mm 43 Gs
4.3 mT
 0.00 kg / 0.00 LBS
0.2 g / 0.0 N
 safe
30 mm 14 Gs
1.4 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
50 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
Grip strength drops drastically with every mm of gap. Remember that every additional insulation layer (e.g., dirt, varnish, dust) strongly diminishes the holding power. Neodymiums work most effectively in perfect adhesion; gap nullifies the force. Analyze how rapidly the parameters plummet, when the magnet does not touch directly to the metal substrate. When designing the assembly, avoid redundant distances.

Table 2: Slippage force (vertical surface)
MW 8x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.43 kg / 0.96 LBS
434.0 g / 4.3 N
1 mm Stal (~0.2) 0.25 kg / 0.55 LBS
248.0 g / 2.4 N
2 mm Stal (~0.2) 0.13 kg / 0.28 LBS
126.0 g / 1.2 N
3 mm Stal (~0.2) 0.06 kg / 0.14 LBS
62.0 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
The table below shows the estimated weight limit needed to initiate the shifting of the magnet vertically against a upright steel wall (considering standard friction). This value varies with the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MW 8x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.65 kg / 1.44 LBS
651.0 g / 6.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.43 kg / 0.96 LBS
434.0 g / 4.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.22 kg / 0.48 LBS
217.0 g / 2.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.09 kg / 2.39 LBS
1085.0 g / 10.6 N
When placing a holder on a upright wall (e.g., a car body), it you can count on just approx. 1/5 of its nominal power. Gravity as well as a weak degree of grip mean that magnets move down easier than they pop off the substrate. Want to create a wall mount? Consider that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the magnet will slip down under a significantly smaller weight. Application of an anti-slip coating can effectively improve the result.

Table 4: Material efficiency (saturation) - power losses
MW 8x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.22 kg / 0.48 LBS
217.0 g / 2.1 N
1 mm
25%
 0.54 kg / 1.20 LBS
542.5 g / 5.3 N
2 mm
50%
 1.09 kg / 2.39 LBS
1085.0 g / 10.6 N
3 mm
75%
 1.63 kg / 3.59 LBS
1627.5 g / 16.0 N
5 mm
100%
 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
10 mm
100%
 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
11 mm
100%
 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
12 mm
100%
 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
A too thin steel is unable to take in the entire magnetic field, which squanders power of the holder. Should you install a neodymium to a weak sheet, the flux will pass right through and the pull force will drop sharply. To achieve the maximum of this neodymium's potential, you need a suitably thick piece of metal. The saturation effect means that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We suggest choosing the steel thickness according to the table below.

Table 5: Thermal resistance (material behavior) - resistance threshold
MW 8x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.17 kg / 4.78 LBS
2170.0 g / 21.3 N
 OK
40 °C -2.2% 2.12 kg / 4.68 LBS
2122.3 g / 20.8 N
 OK
60 °C -4.4% 2.07 kg / 4.57 LBS
2074.5 g / 20.4 N
 OK
80 °C -6.6% 2.03 kg / 4.47 LBS
2026.8 g / 19.9 N
100 °C -28.8% 1.55 kg / 3.41 LBS
1545.0 g / 15.2 N
Classic neodymiums irreversibly lose power past the thermal threshold. Protect against heat – excessive heat can permanently demagnetize this magnet. As the temperature rises, the neodymium's power momentarily drops. Do not use this product near heat sources higher than its safe range. Ignoring the limit will result in destruction of magnetism.
*Important note: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) may lose charge permanently sooner than taller cylinders. Red status in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MW 8x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 7.23 kg / 15.94 LBS
5 742 Gs
1.08 kg / 2.39 LBS
1084 g / 10.6 N
 N/A
1 mm 5.58 kg / 12.31 LBS
8 490 Gs
0.84 kg / 1.85 LBS
838 g / 8.2 N
 5.03 kg / 11.08 LBS
~0 Gs
2 mm 4.14 kg / 9.13 LBS
7 310 Gs
0.62 kg / 1.37 LBS
621 g / 6.1 N
 3.73 kg / 8.21 LBS
~0 Gs
3 mm 2.98 kg / 6.58 LBS
6 207 Gs
0.45 kg / 0.99 LBS
448 g / 4.4 N
 2.69 kg / 5.92 LBS
~0 Gs
5 mm 1.48 kg / 3.26 LBS
4 369 Gs
0.22 kg / 0.49 LBS
222 g / 2.2 N
 1.33 kg / 2.93 LBS
~0 Gs
10 mm 0.26 kg / 0.57 LBS
1 830 Gs
0.04 kg / 0.09 LBS
39 g / 0.4 N
 0.23 kg / 0.51 LBS
~0 Gs
20 mm 0.02 kg / 0.04 LBS
468 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.03 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
47 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
29 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
19 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
13 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
9 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
7 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products attract each other from a wider radius than a neodymium and metal setup. The setup of two magnets creates a more powerful interaction and a larger range of performance. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the impact force is huge. The repulsion force is a bit weaker than the attraction, but still significant.
*Flux density between like poles drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Important: Results show sliding force of two matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
MW 8x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.5 cm
Hearing aid 10 Gs (1.0 mT) 3.5 cm
Timepiece 20 Gs (2.0 mT) 3.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field is a serious hazard to IT equipment as well as medical implants. These magnets produce a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation penetrates the body and glass. Increased vigilance must be taken by people with hearing aids and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - warning
MW 8x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 34.31 km/h
(9.53 m/s)
 0.09 J
30 mm 59.35 km/h
(16.49 m/s)
 0.26 J
50 mm 76.62 km/h
(21.28 m/s)
 0.43 J
100 mm 108.35 km/h
(30.10 m/s)
 0.85 J
NdFeB products are very brittle – a collision with steel causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or painful pinches to fingers. Always hold the magnet during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when handling with large magnets.

Table 9: Surface protection spec
MW 8x5 / 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 following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MW 8x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 2 450 Mx 24.5 µWb
Pc Coefficient 0.68 High (Stable)
Total magnetic flux passing through the pole surface. Essential parameter in coil applications and motors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MW 8x5 / N38

Environment Effective steel pull Effect
Air (land) 2.17 kg Standard
Water (riverbed) 2.48 kg
(+0.31 kg buoyancy gain)
+14.5%
Warning: 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

*Caution: On a vertical surface, the magnet retains only a fraction of its nominal pull.

2. Steel thickness impact

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

3. Thermal stability

*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) = 0.68

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
Chemical composition
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: 010105-2026
Measurement Calculator
Force (pull)
Magnetic Field
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This product is an extremely powerful cylindrical magnet, composed of modern NdFeB material, which, with dimensions of Ø8x5 mm, guarantees maximum efficiency. The MW 8x5 / N38 component is characterized by an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 2.17 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 21.31 N with a weight of only 1.88 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in industry, specialized industrial adhesives are used, which do not react with the nickel coating 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 excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø8x5), 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 5 mm. The key parameter here is the holding force amounting to approximately 2.17 kg (force ~21.31 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 cylinder is magnetized axially (along the height of 5 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 through the diameter if your project requires it.

Advantages as well as disadvantages of neodymium magnets.

Pros

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They have stable power, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets perfectly protect themselves against demagnetization caused by external fields,
  • A magnet with a shiny nickel surface has better aesthetics,
  • Magnetic induction on the working layer of the magnet remains strong,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
  • Possibility of custom forming and adapting to individual needs,
  • Wide application in electronics industry – they are utilized in computer drives, drive modules, diagnostic systems, as well as technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose their strength 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 durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of creating nuts in the magnet and complex shapes - preferred is a housing - magnetic holder.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices can complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price exceeds standard values,

Lifting parameters

Maximum magnetic pulling force – what contributes to it?

The force parameter is a result of laboratory testing conducted under standard conditions:
  • with the use of a yoke made of special test steel, ensuring full magnetic saturation
  • with a thickness minimum 10 mm
  • with a surface free of scratches
  • with zero gap (without coatings)
  • during pulling in a direction vertical to the mounting surface
  • at standard ambient temperature

Magnet lifting force in use – key factors

Holding efficiency is affected by working environment parameters, such as (from most important):
  • Distance (betwixt the magnet and the metal), since even a very small distance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to paint, rust or dirt).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Material composition – different alloys attracts identically. Alloy additives weaken the interaction with the magnet.
  • Surface condition – smooth surfaces ensure maximum contact, which improves force. Rough surfaces weaken the grip.
  • Temperature – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Do not underestimate power

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Fire risk

Drilling and cutting of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

GPS and phone interference

Navigation devices and mobile phones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Heat sensitivity

Do not overheat. NdFeB magnets are susceptible to heat. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Safe distance

Powerful magnetic fields can erase data on payment cards, HDDs, and storage devices. Stay away of min. 10 cm.

Shattering risk

Despite the nickel coating, the material is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Danger to the youngest

Strictly keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.

Bodily injuries

Big blocks can break fingers instantly. Never put your hand between two attracting surfaces.

Life threat

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Allergic reactions

Studies show that nickel (standard magnet coating) is a potent allergen. If your skin reacts to metals, refrain from touching magnets with bare hands and opt for versions in plastic housing.

Danger! Need more info? Read our article: Are neodymium magnets dangerous?