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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

0.836 with VAT / pcs + price for transport

0.680 ZŁ net + 23% VAT / pcs

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Technical - 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

Technical analysis of the magnet - technical parameters

Presented data constitute the result of a engineering analysis. Values rely on algorithms for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - power drop
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 pounds
2170.0 g / 21.3 N
strong
1 mm 3655 Gs
365.5 mT
1.24 kg / 2.74 pounds
1242.8 g / 12.2 N
safe
2 mm 2610 Gs
261.0 mT
0.63 kg / 1.40 pounds
633.9 g / 6.2 N
safe
3 mm 1825 Gs
182.5 mT
0.31 kg / 0.68 pounds
310.0 g / 3.0 N
safe
5 mm 915 Gs
91.5 mT
0.08 kg / 0.17 pounds
77.9 g / 0.8 N
safe
10 mm 234 Gs
23.4 mT
0.01 kg / 0.01 pounds
5.1 g / 0.1 N
safe
15 mm 89 Gs
8.9 mT
0.00 kg / 0.00 pounds
0.7 g / 0.0 N
safe
20 mm 43 Gs
4.3 mT
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
safe
30 mm 14 Gs
1.4 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
50 mm 3 Gs
0.3 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.43 kg / 0.96 pounds
434.0 g / 4.3 N
1 mm Stal (~0.2) 0.25 kg / 0.55 pounds
248.0 g / 2.4 N
2 mm Stal (~0.2) 0.13 kg / 0.28 pounds
126.0 g / 1.2 N
3 mm Stal (~0.2) 0.06 kg / 0.14 pounds
62.0 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 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 pounds
651.0 g / 6.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.43 kg / 0.96 pounds
434.0 g / 4.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.22 kg / 0.48 pounds
217.0 g / 2.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.09 kg / 2.39 pounds
1085.0 g / 10.6 N

Table 4: Steel thickness (saturation) - sheet metal selection
MW 8x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.22 kg / 0.48 pounds
217.0 g / 2.1 N
1 mm
25%
0.54 kg / 1.20 pounds
542.5 g / 5.3 N
2 mm
50%
1.09 kg / 2.39 pounds
1085.0 g / 10.6 N
3 mm
75%
1.63 kg / 3.59 pounds
1627.5 g / 16.0 N
5 mm
100%
2.17 kg / 4.78 pounds
2170.0 g / 21.3 N
10 mm
100%
2.17 kg / 4.78 pounds
2170.0 g / 21.3 N
11 mm
100%
2.17 kg / 4.78 pounds
2170.0 g / 21.3 N
12 mm
100%
2.17 kg / 4.78 pounds
2170.0 g / 21.3 N

Table 5: Working in heat (material behavior) - thermal limit
MW 8x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.17 kg / 4.78 pounds
2170.0 g / 21.3 N
OK
40 °C -2.2% 2.12 kg / 4.68 pounds
2122.3 g / 20.8 N
OK
60 °C -4.4% 2.07 kg / 4.57 pounds
2074.5 g / 20.4 N
OK
80 °C -6.6% 2.03 kg / 4.47 pounds
2026.8 g / 19.9 N
100 °C -28.8% 1.55 kg / 3.41 pounds
1545.0 g / 15.2 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
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 pounds
5 742 Gs
1.08 kg / 2.39 pounds
1084 g / 10.6 N
N/A
1 mm 5.58 kg / 12.31 pounds
8 490 Gs
0.84 kg / 1.85 pounds
838 g / 8.2 N
5.03 kg / 11.08 pounds
~0 Gs
2 mm 4.14 kg / 9.13 pounds
7 310 Gs
0.62 kg / 1.37 pounds
621 g / 6.1 N
3.73 kg / 8.21 pounds
~0 Gs
3 mm 2.98 kg / 6.58 pounds
6 207 Gs
0.45 kg / 0.99 pounds
448 g / 4.4 N
2.69 kg / 5.92 pounds
~0 Gs
5 mm 1.48 kg / 3.26 pounds
4 369 Gs
0.22 kg / 0.49 pounds
222 g / 2.2 N
1.33 kg / 2.93 pounds
~0 Gs
10 mm 0.26 kg / 0.57 pounds
1 830 Gs
0.04 kg / 0.09 pounds
39 g / 0.4 N
0.23 kg / 0.51 pounds
~0 Gs
20 mm 0.02 kg / 0.04 pounds
468 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.03 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
47 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
29 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
19 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
13 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
9 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
7 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Safety (HSE) (electronics) - precautionary measures
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
Mechanical watch 20 Gs (2.0 mT) 3.0 cm
Mobile device 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

Table 8: Impact energy (kinetic energy) - collision effects
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

Table 9: Coating parameters (durability)
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)

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

Parameter Value SI Unit / Description
Magnetic Flux 2 450 Mx 24.5 µWb
Pc Coefficient 0.68 High (Stable)

Table 11: Hydrostatics and buoyancy
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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Shear force

*Note: On a vertical surface, the magnet holds just ~20% of its nominal pull.

2. Plate thickness effect

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Power loss vs temp

*For standard magnets, 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.

Technical and environmental data
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%
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: 010105-2025
Magnet Unit Converter
Force (pull)

Magnetic Induction

View also products

The presented product is an exceptionally strong cylindrical magnet, produced from durable NdFeB material, which, at dimensions of Ø8x5 mm, guarantees the highest energy density. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 2.17 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 21.31 N with a weight of only 1.88 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in industry, anaerobic resins 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 (Ø8x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 5 mm. The value of 21.31 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1.88 g. 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. 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.

Pros and cons of rare earth magnets.

Pros

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • Their power remains stable, and after around ten years it drops only by ~1% (according to research),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • By using a reflective coating of silver, the element presents an proper look,
  • Neodymium magnets achieve maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to modularity in designing and the ability to modify to client solutions,
  • Huge importance in electronics industry – they are used in computer drives, brushless drives, medical devices, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in compact constructions

Cons

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape and 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
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating threads and complex shapes in magnets, we propose using cover - magnetic mount.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. Additionally, tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Pull force analysis

Maximum lifting capacity of the magnetwhat it depends on?

Breakaway force was determined for optimal configuration, taking into account:
  • with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
  • possessing a thickness of min. 10 mm to avoid saturation
  • with an polished contact surface
  • with zero gap (no coatings)
  • for force acting at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

Real force impacted by specific conditions, such as (from most important):
  • Space between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – mild steel gives the best results. Alloy admixtures reduce magnetic permeability and holding force.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

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

Warnings
Safe distance

Equipment safety: Strong magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, timepieces).

Medical implants

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

Eye protection

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

No play value

Always store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets connecting inside the body are tragic.

Thermal limits

Do not overheat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Machining danger

Combustion risk: Rare earth powder is explosive. Do not process magnets without safety gear as this risks ignition.

Allergy Warning

It is widely known that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, refrain from touching magnets with bare hands and select encased magnets.

Do not underestimate power

Handle with care. Rare earth magnets attract from a distance and snap with massive power, often quicker than you can move away.

Hand protection

Pinching hazard: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Threat to navigation

Note: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a separation from your phone, tablet, and GPS.

Attention! Looking for details? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98