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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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Physical properties - 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 modeling of the magnet - report

The following information represent the direct effect of a mathematical simulation. Values are based on algorithms for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Treat these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (force 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 lbs
2170.0 g / 21.3 N
medium risk
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

Table 2: Sliding 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

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

Table 4: Material efficiency (substrate influence) - 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

Table 5: Thermal stability (stability) - 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 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

Table 6: Two magnets (attraction) - field range
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

Table 7: Safety (HSE) (implants) - 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
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

Table 8: Impact energy (cracking risk) - 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: Electrical data (Flux)
MW 8x5 / N38

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

Table 11: Submerged application
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Caution: On a vertical wall, the magnet holds merely approx. 20-30% of its perpendicular strength.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Temperature resistance

*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) = 0.68

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
Magnet Unit Converter
Force (pull)

Magnetic Induction

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This product is a very strong cylinder magnet, made from durable NdFeB material, which, with dimensions of Ø8x5 mm, guarantees maximum efficiency. This specific item boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 2.17 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced Hall effect sensors, and efficient filters, where field concentration on a small surface counts. 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 every gram matters.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks immediate cracking 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 durability of the connection.
Magnets N38 are strong enough for 90% 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 key parameter here is the lifting capacity amounting to approximately 2.17 kg (force ~21.31 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 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.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • By using a lustrous layer of nickel, the element gains an elegant look,
  • Magnets are distinguished by extremely high magnetic induction on the outer side,
  • 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 accurate modeling as well as adjusting to specific applications,
  • Huge importance in future technologies – they find application in computer drives, motor assemblies, medical devices, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in compact constructions

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease 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 stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of producing threads in the magnet and complex shapes - recommended is casing - magnet mounting.
  • Potential hazard resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these products are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Maximum lifting force for a neodymium magnet – what contributes to it?

The specified lifting capacity refers to the limit force, recorded under laboratory conditions, meaning:
  • on a plate made of structural steel, perfectly concentrating the magnetic flux
  • with a cross-section minimum 10 mm
  • with an polished contact surface
  • under conditions of gap-free contact (surface-to-surface)
  • for force acting at a right angle (in the magnet axis)
  • at room temperature

Determinants of practical lifting force of a magnet

In real-world applications, the actual holding force is determined by a number of factors, presented from crucial:
  • Air gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Direction of force – maximum parameter is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet’s surface and the plate decreases the holding force.

Precautions when working with neodymium magnets
Fire risk

Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Implant safety

People with a ICD should keep an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.

Permanent damage

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Handling guide

Handle magnets with awareness. Their immense force can shock even experienced users. Stay alert and do not underestimate their power.

GPS Danger

A strong magnetic field negatively affects the operation of compasses in phones and navigation systems. Keep magnets near a smartphone to prevent breaking the sensors.

No play value

Product intended for adults. Small elements pose a choking risk, leading to serious injuries. Store away from kids and pets.

Electronic devices

Very strong magnetic fields can corrupt files on payment cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Nickel allergy

Some people suffer from a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Frequent touching might lead to dermatitis. It is best to wear safety gloves.

Serious injuries

Big blocks can smash fingers in a fraction of a second. Never place your hand betwixt two strong magnets.

Shattering risk

Protect your eyes. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Attention! Learn more about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98