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neodymium magnets

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MW 8x1.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010101

GTIN: 5906301811008

5.00

Diameter Ø

8 mm [±0,1 mm]

Height

1.5 mm [±0,1 mm]

Weight

0.57 g

Magnetization Direction

↑ axial

Load capacity

0.65 kg / 6.39 N

Magnetic Induction

217.52 mT

Coating

[NiCuNi] Nickel

0.455 with VAT / pcs + price for transport

0.370 ZŁ net + 23% VAT / pcs

bulk discounts:

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Parameters along with structure of a magnet can be analyzed with our force calculator.

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MW 8x1.5 / N38 - cylindrical magnet

Specification / characteristics MW 8x1.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010101
GTIN 5906301811008
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 1.5 mm [±0,1 mm]
Weight 0.57 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.65 kg / 6.39 N
Magnetic Induction ~ ? 217.52 mT
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x1.5 / N38 - cylindrical magnet
properties values units
remenance Br [Min. - Max.] ? 12.2-12.6 kGs
remenance Br [Min. - Max.] ? 1220-1260 T
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 106 °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 - data

The following data constitute the outcome of a physical calculation. Results were calculated on algorithms for the material NdFeB. Actual conditions might slightly deviate from the simulation results. Use these data as a reference point when designing systems.

Table 1: Static force (force vs distance) - characteristics
MW 8x1.5 / N38
Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 2174 Gs
217.4 mT
0.65 kg / 650.0 g
6.4 N
weak grip
1 mm 1782 Gs
178.2 mT
0.44 kg / 436.8 g
4.3 N
weak grip
2 mm 1310 Gs
131.0 mT
0.24 kg / 236.0 g
2.3 N
weak grip
5 mm 439 Gs
43.9 mT
0.03 kg / 26.5 g
0.3 N
weak grip
10 mm 99 Gs
9.9 mT
0.00 kg / 1.4 g
0.0 N
weak grip
15 mm 35 Gs
3.5 mT
0.00 kg / 0.2 g
0.0 N
weak grip
20 mm 16 Gs
1.6 mT
0.00 kg / 0.0 g
0.0 N
weak grip
30 mm 5 Gs
0.5 mT
0.00 kg / 0.0 g
0.0 N
weak grip
50 mm 1 Gs
0.1 mT
0.00 kg / 0.0 g
0.0 N
weak grip
Table 2: Vertical assembly (sliding) - vertical pull
MW 8x1.5 / N38
Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.20 kg / 195.0 g
1.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.13 kg / 130.0 g
1.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.07 kg / 65.0 g
0.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.33 kg / 325.0 g
3.2 N
Table 3: Steel thickness (saturation) - power losses
MW 8x1.5 / N38
Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.07 kg / 65.0 g
0.6 N
1 mm
25%
0.16 kg / 162.5 g
1.6 N
2 mm
50%
0.33 kg / 325.0 g
3.2 N
5 mm
100%
0.65 kg / 650.0 g
6.4 N
10 mm
100%
0.65 kg / 650.0 g
6.4 N
Table 4: Working in heat (material behavior) - thermal limit
MW 8x1.5 / N38
Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 0.65 kg / 650.0 g
6.4 N
OK
40 °C -2.2% 0.64 kg / 635.7 g
6.2 N
OK
60 °C -4.4% 0.62 kg / 621.4 g
6.1 N
OK
80 °C -6.6% 0.61 kg / 607.1 g
6.0 N
100 °C -28.8% 0.46 kg / 462.8 g
4.5 N
Table 5: Two magnets (repulsion) - field collision
MW 8x1.5 / N38
Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 0.98 kg / 975.0 g
9.6 N
N/A
2 mm 0.36 kg / 360.0 g
3.5 N
0.34 kg / 336.0 g
3.3 N
5 mm 0.05 kg / 45.0 g
0.4 N
0.04 kg / 42.0 g
0.4 N
10 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
20 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
50 mm 0.00 kg / 0.0 g
0.0 N
0.00 kg / 0.0 g
0.0 N
Table 6: Protective zones (implants) - warnings
MW 8x1.5 / N38
Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Mechanical watch 20 Gs (2.0 mT) 2.0 cm
Mobile device 40 Gs (4.0 mT) 1.5 cm
Remote 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
Table 7: Dynamics (kinetic energy) - collision effects
MW 8x1.5 / N38
Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 34.10 km/h
(9.47 m/s)
0.03 J
30 mm 58.99 km/h
(16.39 m/s)
0.08 J
50 mm 76.15 km/h
(21.15 m/s)
0.13 J
100 mm 107.70 km/h
(29.92 m/s)
0.26 J
Table 8: Coating parameters (durability)
MW 8x1.5 / 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 9: Underwater work (magnet fishing)
MW 8x1.5 / N38
Environment Effective steel pull Effect
Air (land) 0.65 kg Standard
Water (riverbed) 0.74 kg
(+0.09 kg Buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Other proposals

The offered product is an incredibly powerful cylindrical magnet, manufactured from modern NdFeB material, which, with dimensions of Ø8x1.5 mm, guarantees the highest energy density. The MW 8x1.5 / N38 model is characterized by an accuracy of ±0.1mm and professional build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 0.65 kg), this product is in stock from our warehouse in Poland, 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 ideal for building generators, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 6.39 N with a weight of only 0.57 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this professional component. To ensure stability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø8x1.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø8x1.5 mm, which, at a weight of 0.57 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 0.65 kg (force ~6.39 N), which, with such defined 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 cylinder is magnetized axially (along the height of 1.5 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.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

  • They retain attractive force for nearly 10 years – the drop is just ~1% (in theory),
  • They have excellent resistance to weakening of magnetic properties due to opposing magnetic fields,
  • A magnet with a shiny silver surface looks better,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
  • Thanks to freedom in forming and the ability to modify to complex applications,
  • Fundamental importance in innovative solutions – they find application in mass storage devices, electric motors, diagnostic systems, also technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing nuts and complex shapes in magnets, we propose using cover - magnetic mount.
  • Health risk related to microscopic parts of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Magnetic strength at its maximum – what contributes to it?

Breakaway force was defined for optimal configuration, assuming:

  • on a plate made of structural steel, perfectly concentrating the magnetic flux
  • whose thickness reaches at least 10 mm
  • with a surface free of scratches
  • under conditions of no distance (metal-to-metal)
  • during detachment in a direction perpendicular to the mounting surface
  • at room temperature

Determinants of practical lifting force of a magnet

Holding efficiency is affected by working environment parameters, including (from priority):

  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Steel thickness – insufficiently thick sheet does not close the flux, causing part of the power to be escaped into the air.
  • Metal type – different alloys attracts identically. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet and the plate lowers the holding force.

Safe handling of NdFeB magnets

Do not overheat magnets

Standard neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Magnetic media

Do not bring magnets close to a purse, computer, or screen. The magnetism can irreversibly ruin these devices and wipe information from cards.

Machining danger

Powder generated during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Skin irritation risks

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, cease handling magnets and wear gloves.

Pinching danger

Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Medical implants

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

GPS and phone interference

Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Risk of cracking

NdFeB magnets are ceramic materials, meaning they are fragile like glass. Collision of two magnets leads to them breaking into shards.

Immense force

Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

This is not a toy

Neodymium magnets are not intended for children. Swallowing a few magnets can lead to them pinching intestinal walls, which constitutes a critical condition and necessitates urgent medical intervention.

Important!

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

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98