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MW 8x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010102

GTIN/EAN: 5906301811015

5.00
Load capacity 1.47 kg / 14.45 N Magnetic Induction 598.12 mT / 5981 Gs
Diameter Ø
8 mm [±0,1 mm]
Height
15 mm [±0,1 mm]
Weight
5.65 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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Net
Gross
price from 1 pcs
2.80 zł
3.44 zł
price from 250 pcs
2.63 zł
3.24 zł
price from 900 pcs
2.46 zł
3.03 zł

Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical parameters of the product - MW 8x15 / N38 - cylindrical magnet

Specification / characteristics - MW 8x15 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010102
GTIN/EAN 5906301811015
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 15 mm [±0,1 mm]
Weight 5.65 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.47 kg / 14.45 N
Magnetic Induction ~ ? 598.12 mT / 5981 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 8x15 / 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 310 °C
Curie Temperature TF 590 °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 assembly - data

These data constitute the direct effect of a mathematical analysis. Values rely on algorithms for the material Nd2Fe14B. Actual parameters may differ. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - power drop
MW 8x15 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5975 Gs
597.5 mT
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
safe
1 mm 4511 Gs
451.1 mT
0.84 kg / 1.85 pounds
837.8 g / 8.2 N
safe
2 mm 3262 Gs
326.2 mT
0.44 kg / 0.97 pounds
438.2 g / 4.3 N
safe
3 mm 2332 Gs
233.2 mT
0.22 kg / 0.49 pounds
224.0 g / 2.2 N
safe
5 mm 1238 Gs
123.8 mT
0.06 kg / 0.14 pounds
63.1 g / 0.6 N
safe
10 mm 366 Gs
36.6 mT
0.01 kg / 0.01 pounds
5.5 g / 0.1 N
safe
15 mm 155 Gs
15.5 mT
0.00 kg / 0.00 pounds
1.0 g / 0.0 N
safe
20 mm 80 Gs
8.0 mT
0.00 kg / 0.00 pounds
0.3 g / 0.0 N
safe
30 mm 30 Gs
3.0 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe
50 mm 8 Gs
0.8 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
safe

Table 2: Vertical force (vertical surface)
MW 8x15 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.29 kg / 0.65 pounds
294.0 g / 2.9 N
1 mm Stal (~0.2) 0.17 kg / 0.37 pounds
168.0 g / 1.6 N
2 mm Stal (~0.2) 0.09 kg / 0.19 pounds
88.0 g / 0.9 N
3 mm Stal (~0.2) 0.04 kg / 0.10 pounds
44.0 g / 0.4 N
5 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 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) - vertical pull
MW 8x15 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.44 kg / 0.97 pounds
441.0 g / 4.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.29 kg / 0.65 pounds
294.0 g / 2.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.15 kg / 0.32 pounds
147.0 g / 1.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.74 kg / 1.62 pounds
735.0 g / 7.2 N

Table 4: Steel thickness (substrate influence) - power losses
MW 8x15 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.15 kg / 0.32 pounds
147.0 g / 1.4 N
1 mm
25%
0.37 kg / 0.81 pounds
367.5 g / 3.6 N
2 mm
50%
0.74 kg / 1.62 pounds
735.0 g / 7.2 N
3 mm
75%
1.10 kg / 2.43 pounds
1102.5 g / 10.8 N
5 mm
100%
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
10 mm
100%
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
11 mm
100%
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
12 mm
100%
1.47 kg / 3.24 pounds
1470.0 g / 14.4 N

Table 5: Thermal resistance (stability) - power drop
MW 8x15 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.47 kg / 3.24 pounds
1470.0 g / 14.4 N
OK
40 °C -2.2% 1.44 kg / 3.17 pounds
1437.7 g / 14.1 N
OK
60 °C -4.4% 1.41 kg / 3.10 pounds
1405.3 g / 13.8 N
OK
80 °C -6.6% 1.37 kg / 3.03 pounds
1373.0 g / 13.5 N
100 °C -28.8% 1.05 kg / 2.31 pounds
1046.6 g / 10.3 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 8x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 11.06 kg / 24.39 pounds
6 130 Gs
1.66 kg / 3.66 pounds
1660 g / 16.3 N
N/A
1 mm 8.49 kg / 18.72 pounds
10 469 Gs
1.27 kg / 2.81 pounds
1274 g / 12.5 N
7.64 kg / 16.85 pounds
~0 Gs
2 mm 6.31 kg / 13.90 pounds
9 022 Gs
0.95 kg / 2.09 pounds
946 g / 9.3 N
5.68 kg / 12.51 pounds
~0 Gs
3 mm 4.59 kg / 10.12 pounds
7 697 Gs
0.69 kg / 1.52 pounds
688 g / 6.8 N
4.13 kg / 9.11 pounds
~0 Gs
5 mm 2.36 kg / 5.20 pounds
5 516 Gs
0.35 kg / 0.78 pounds
354 g / 3.5 N
2.12 kg / 4.68 pounds
~0 Gs
10 mm 0.48 kg / 1.05 pounds
2 476 Gs
0.07 kg / 0.16 pounds
71 g / 0.7 N
0.43 kg / 0.94 pounds
~0 Gs
20 mm 0.04 kg / 0.09 pounds
731 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
0.04 kg / 0.08 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
94 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
60 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
41 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
29 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
21 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
16 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 8x15 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.0 cm
Car key 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Dynamics (kinetic energy) - warning
MW 8x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 10.47 km/h
(2.91 m/s)
0.02 J
30 mm 10.51 km/h
(2.92 m/s)
0.02 J
50 mm 10.51 km/h
(2.92 m/s)
0.02 J
100 mm 10.51 km/h
(2.92 m/s)
0.02 J

Table 9: Corrosion resistance
MW 8x15 / 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 8x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 306 Mx 33.1 µWb
Pc Coefficient 1.19 High (Stable)

Table 11: Hydrostatics and buoyancy
MW 8x15 / N38

Environment Effective steel pull Effect
Air (land) 1.47 kg Standard
Water (riverbed) 1.68 kg
(+0.21 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)

*Caution: On a vertical wall, the magnet retains merely ~20% of its nominal pull.

2. Steel thickness impact

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.19

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

Material specification

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%

Ecology and recycling (GPSR)

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: 010102-2026
Measurement Calculator

Pulling force


Field Strength

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The presented product is an extremely powerful rod magnet, composed of modern NdFeB material, which, at dimensions of Ø8x15 mm, guarantees optimal power. The MW 8x15 / N38 component is characterized by a tolerance of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 1.47 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 14.45 N with a weight of only 5.65 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using epoxy glues. To ensure long-term durability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability 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 the strongest magnets in the same volume (Ø8x15), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø8x15 mm, which, at a weight of 5.65 g, makes it an element with impressive magnetic energy density. The value of 14.45 N means that the magnet is capable of holding a weight many times exceeding its own mass of 5.65 g. 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 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 diametrically if your project requires it.

Pros and cons of rare earth magnets.

Strengths

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
  • They are extremely resistant to demagnetization induced by external magnetic fields,
  • In other words, due to the smooth layer of gold, the element becomes visually attractive,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of exact creating as well as modifying to complex needs,
  • Versatile presence in high-tech industry – they are commonly used in hard drives, electromotive mechanisms, precision medical tools, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in small systems

Limitations

Drawbacks and weaknesses of neodymium magnets: application proposals
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • 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 as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing nuts and complicated forms in magnets, we recommend using a housing - magnetic holder.
  • Potential hazard resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these products can be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Magnetic strength at its maximum – what it depends on?

The lifting capacity listed is a measurement result conducted under standard conditions:
  • on a plate made of structural steel, perfectly concentrating the magnetic field
  • with a cross-section minimum 10 mm
  • with a plane free of scratches
  • with direct contact (without coatings)
  • under vertical force vector (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

In practice, the actual holding force depends on several key aspects, presented from most significant:
  • Distance – existence of any layer (rust, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Angle of force application – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness creates an air distance.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Safe handling of neodymium magnets
Combustion hazard

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

Choking Hazard

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

Caution required

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

Impact on smartphones

Note: neodymium magnets generate a field that interferes with precision electronics. Keep a separation from your phone, device, and navigation systems.

Eye protection

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

Allergic reactions

It is widely known that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands and opt for versions in plastic housing.

Pinching danger

Mind your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying everything in their path. Be careful!

Threat to electronics

Avoid bringing magnets near a purse, computer, or TV. The magnetic field can permanently damage these devices and erase data from cards.

Permanent damage

Regular neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.

ICD Warning

For implant holders: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.

Important! Want to know more? Read our article: Why are neodymium magnets dangerous?