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MW 8x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010103

GTIN/EAN: 5906301811022

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

1.13 g

Magnetization Direction

↑ axial

Load capacity

1.70 kg / 16.67 N

Magnetic Induction

371.53 mT / 3715 Gs

Coating

[NiCuNi] Nickel

0.701 with VAT / pcs + price for transport

0.570 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 8x3 / N38 - cylindrical magnet

Specification / characteristics - MW 8x3 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010103
GTIN/EAN 5906301811022
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 3 mm [±0,1 mm]
Weight 1.13 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.70 kg / 16.67 N
Magnetic Induction ~ ? 371.53 mT / 3715 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x3 / 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 analysis of the assembly - technical parameters

These data represent the result of a engineering simulation. Values rely on algorithms for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - characteristics
MW 8x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3712 Gs
371.2 mT
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
safe
1 mm 2880 Gs
288.0 mT
1.02 kg / 2.26 LBS
1023.3 g / 10.0 N
safe
2 mm 2069 Gs
206.9 mT
0.53 kg / 1.16 LBS
527.9 g / 5.2 N
safe
3 mm 1439 Gs
143.9 mT
0.26 kg / 0.56 LBS
255.3 g / 2.5 N
safe
5 mm 704 Gs
70.4 mT
0.06 kg / 0.13 LBS
61.1 g / 0.6 N
safe
10 mm 169 Gs
16.9 mT
0.00 kg / 0.01 LBS
3.5 g / 0.0 N
safe
15 mm 62 Gs
6.2 mT
0.00 kg / 0.00 LBS
0.5 g / 0.0 N
safe
20 mm 29 Gs
2.9 mT
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
safe
30 mm 9 Gs
0.9 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
50 mm 2 Gs
0.2 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

Table 2: Slippage force (vertical surface)
MW 8x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.34 kg / 0.75 LBS
340.0 g / 3.3 N
1 mm Stal (~0.2) 0.20 kg / 0.45 LBS
204.0 g / 2.0 N
2 mm Stal (~0.2) 0.11 kg / 0.23 LBS
106.0 g / 1.0 N
3 mm Stal (~0.2) 0.05 kg / 0.11 LBS
52.0 g / 0.5 N
5 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 g / 0.1 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 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 8x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.51 kg / 1.12 LBS
510.0 g / 5.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.85 kg / 1.87 LBS
850.0 g / 8.3 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 8x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
1 mm
25%
0.43 kg / 0.94 LBS
425.0 g / 4.2 N
2 mm
50%
0.85 kg / 1.87 LBS
850.0 g / 8.3 N
3 mm
75%
1.28 kg / 2.81 LBS
1275.0 g / 12.5 N
5 mm
100%
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
10 mm
100%
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
11 mm
100%
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
12 mm
100%
1.70 kg / 3.75 LBS
1700.0 g / 16.7 N

Table 5: Thermal stability (stability) - power drop
MW 8x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.70 kg / 3.75 LBS
1700.0 g / 16.7 N
OK
40 °C -2.2% 1.66 kg / 3.67 LBS
1662.6 g / 16.3 N
OK
60 °C -4.4% 1.63 kg / 3.58 LBS
1625.2 g / 15.9 N
80 °C -6.6% 1.59 kg / 3.50 LBS
1587.8 g / 15.6 N
100 °C -28.8% 1.21 kg / 2.67 LBS
1210.4 g / 11.9 N

Table 6: Two magnets (attraction) - forces in the system
MW 8x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 4.27 kg / 9.42 LBS
5 146 Gs
0.64 kg / 1.41 LBS
641 g / 6.3 N
N/A
1 mm 3.40 kg / 7.50 LBS
6 627 Gs
0.51 kg / 1.13 LBS
510 g / 5.0 N
3.06 kg / 6.75 LBS
~0 Gs
2 mm 2.57 kg / 5.67 LBS
5 761 Gs
0.39 kg / 0.85 LBS
386 g / 3.8 N
2.31 kg / 5.10 LBS
~0 Gs
3 mm 1.87 kg / 4.12 LBS
4 914 Gs
0.28 kg / 0.62 LBS
281 g / 2.8 N
1.68 kg / 3.71 LBS
~0 Gs
5 mm 0.93 kg / 2.04 LBS
3 456 Gs
0.14 kg / 0.31 LBS
139 g / 1.4 N
0.83 kg / 1.84 LBS
~0 Gs
10 mm 0.15 kg / 0.34 LBS
1 408 Gs
0.02 kg / 0.05 LBS
23 g / 0.2 N
0.14 kg / 0.30 LBS
~0 Gs
20 mm 0.01 kg / 0.02 LBS
339 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
31 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
19 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
12 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
8 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
6 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
4 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Hazards (implants) - precautionary measures
MW 8x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 4.0 cm
Hearing aid 10 Gs (1.0 mT) 3.0 cm
Timepiece 20 Gs (2.0 mT) 2.5 cm
Mobile device 40 Gs (4.0 mT) 2.0 cm
Car key 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) - warning
MW 8x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 39.17 km/h
(10.88 m/s)
0.07 J
30 mm 67.75 km/h
(18.82 m/s)
0.20 J
50 mm 87.47 km/h
(24.30 m/s)
0.33 J
100 mm 123.70 km/h
(34.36 m/s)
0.67 J

Table 9: Corrosion resistance
MW 8x3 / 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 8x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 1 946 Mx 19.5 µWb
Pc Coefficient 0.48 Low (Flat)

Table 11: Submerged application
MW 8x3 / N38

Environment Effective steel pull Effect
Air (land) 1.70 kg Standard
Water (riverbed) 1.95 kg
(+0.25 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

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

2. Plate thickness effect

*Thin steel (e.g. computer case) significantly reduces the holding force.

3. Heat tolerance

*For N38 material, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.48

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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 specification and ecology
Elemental analysis
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: 010103-2026
Measurement Calculator
Magnet pull force

Magnetic Induction

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This product is an exceptionally strong cylinder magnet, manufactured from durable NdFeB material, which, with dimensions of Ø8x3 mm, guarantees maximum efficiency. This specific item is characterized by high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 1.70 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 16.67 N with a weight of only 1.13 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Due to the delicate structure of the ceramic sinter, 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, anaerobic resins 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 modeling and machine building, where excessive miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø8x3), 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 Ø8x3 mm, which, at a weight of 1.13 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 1.70 kg (force ~16.67 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 3 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.

Pros and cons of rare earth magnets.

Advantages

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • Their magnetic field is maintained, and after around ten years it decreases only by ~1% (according to research),
  • Neodymium magnets prove to be extremely resistant to magnetic field loss caused by external interference,
  • By applying a smooth layer of nickel, the element acquires an professional look,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to the possibility of precise molding and adaptation to unique requirements, neodymium magnets can be modeled in a wide range of forms and dimensions, which expands the range of possible applications,
  • Universal use in modern technologies – they are used in magnetic memories, motor assemblies, medical equipment, and complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in producing nuts and complex shapes in magnets, we propose using a housing - magnetic holder.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these products can complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditionswhat affects it?

Magnet power was defined for optimal configuration, including:
  • on a plate made of structural steel, perfectly concentrating the magnetic flux
  • whose transverse dimension is min. 10 mm
  • characterized by smoothness
  • under conditions of ideal adhesion (surface-to-surface)
  • under vertical application of breakaway force (90-degree angle)
  • in stable room temperature

What influences lifting capacity in practice

Please note that the magnet holding will differ influenced by the following factors, in order of importance:
  • Distance (betwixt the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Angle of force application – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin steel causes magnetic saturation, causing part of the flux to be wasted into the air.
  • Steel grade – the best choice is pure iron steel. Hardened steels may attract less.
  • Surface quality – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets
Protective goggles

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets leads to them breaking into small pieces.

Bone fractures

Large magnets can break fingers in a fraction of a second. Do not place your hand between two attracting surfaces.

Respect the power

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

Maximum temperature

Monitor thermal conditions. Exposing the magnet to high heat will destroy its properties and pulling force.

Medical implants

Individuals with a ICD have to keep an large gap from magnets. The magnetism can disrupt the operation of the implant.

Danger to the youngest

Always store magnets out of reach of children. Choking hazard is significant, and the effects of magnets clamping inside the body are fatal.

GPS Danger

An intense magnetic field disrupts the operation of compasses in smartphones and navigation systems. Maintain magnets near a device to avoid breaking the sensors.

Allergic reactions

A percentage of the population experience a contact allergy to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact may cause dermatitis. We strongly advise use protective gloves.

Data carriers

Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Fire warning

Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Safety First! Want to know more? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98