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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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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
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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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Physical properties - 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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

Physical analysis of the product - report

Presented values constitute the outcome of a mathematical simulation. Results were calculated on models for the class Nd2Fe14B. Real-world performance may differ from theoretical values. Use these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs gap) - characteristics
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 lbs
1470.0 g / 14.4 N
weak grip
1 mm 4511 Gs
451.1 mT
0.84 kg / 1.85 lbs
837.8 g / 8.2 N
weak grip
2 mm 3262 Gs
326.2 mT
0.44 kg / 0.97 lbs
438.2 g / 4.3 N
weak grip
3 mm 2332 Gs
233.2 mT
0.22 kg / 0.49 lbs
224.0 g / 2.2 N
weak grip
5 mm 1238 Gs
123.8 mT
0.06 kg / 0.14 lbs
63.1 g / 0.6 N
weak grip
10 mm 366 Gs
36.6 mT
0.01 kg / 0.01 lbs
5.5 g / 0.1 N
weak grip
15 mm 155 Gs
15.5 mT
0.00 kg / 0.00 lbs
1.0 g / 0.0 N
weak grip
20 mm 80 Gs
8.0 mT
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
weak grip
30 mm 30 Gs
3.0 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip
50 mm 8 Gs
0.8 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip

Table 2: Slippage capacity (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 lbs
294.0 g / 2.9 N
1 mm Stal (~0.2) 0.17 kg / 0.37 lbs
168.0 g / 1.6 N
2 mm Stal (~0.2) 0.09 kg / 0.19 lbs
88.0 g / 0.9 N
3 mm Stal (~0.2) 0.04 kg / 0.10 lbs
44.0 g / 0.4 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
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: Wall mounting (shearing) - behavior on slippery surfaces
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 lbs
441.0 g / 4.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.29 kg / 0.65 lbs
294.0 g / 2.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.15 kg / 0.32 lbs
147.0 g / 1.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.74 kg / 1.62 lbs
735.0 g / 7.2 N

Table 4: Steel thickness (saturation) - sheet metal selection
MW 8x15 / N38

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

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

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

Table 6: Two magnets (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 lbs
6 130 Gs
1.66 kg / 3.66 lbs
1660 g / 16.3 N
N/A
1 mm 8.49 kg / 18.72 lbs
10 469 Gs
1.27 kg / 2.81 lbs
1274 g / 12.5 N
7.64 kg / 16.85 lbs
~0 Gs
2 mm 6.31 kg / 13.90 lbs
9 022 Gs
0.95 kg / 2.09 lbs
946 g / 9.3 N
5.68 kg / 12.51 lbs
~0 Gs
3 mm 4.59 kg / 10.12 lbs
7 697 Gs
0.69 kg / 1.52 lbs
688 g / 6.8 N
4.13 kg / 9.11 lbs
~0 Gs
5 mm 2.36 kg / 5.20 lbs
5 516 Gs
0.35 kg / 0.78 lbs
354 g / 3.5 N
2.12 kg / 4.68 lbs
~0 Gs
10 mm 0.48 kg / 1.05 lbs
2 476 Gs
0.07 kg / 0.16 lbs
71 g / 0.7 N
0.43 kg / 0.94 lbs
~0 Gs
20 mm 0.04 kg / 0.09 lbs
731 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
0.04 kg / 0.08 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
94 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
60 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
41 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
29 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
21 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
16 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Protective zones (implants) - 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
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 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: Impact energy (kinetic energy) - collision effects
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 (Flux)
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

1. Vertical hold

*Caution: On a vertical surface, the magnet holds merely a fraction of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Thermal stability

*For N38 grade, the safety limit is 80°C.

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

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

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

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%

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

Force (pull)


Magnetic Induction

Other proposals

The presented product is an exceptionally strong cylindrical magnet, produced from durable NdFeB material, which, at dimensions of Ø8x15 mm, guarantees maximum efficiency. This specific item features high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 1.47 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring quick 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 maximum induction on a small surface counts. Thanks to the pull force of 14.45 N with a weight of only 5.65 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
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.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. 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 store.
This model is characterized by dimensions Ø8x15 mm, which, at a weight of 5.65 g, makes it an element with high 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.
This cylinder is magnetized axially (along the height of 15 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 diametrically if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Strengths

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (in testing),
  • They retain their magnetic properties even under close interference source,
  • A magnet with a smooth gold surface has better aesthetics,
  • Magnets are distinguished by maximum magnetic induction on the outer layer,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of accurate shaping as well as optimizing to defined needs,
  • Versatile presence in advanced technology sectors – they are used in magnetic memories, electric motors, advanced medical instruments, also modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Furthermore, tiny parts of these devices are able to disrupt the diagnostic process 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

Pull force analysis

Maximum magnetic pulling forcewhat contributes to it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, taking into account:
  • using a sheet made of mild steel, serving as a circuit closing element
  • whose thickness is min. 10 mm
  • with a plane free of scratches
  • under conditions of no distance (surface-to-surface)
  • during detachment in a direction perpendicular to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Please note that the working load may be lower influenced by the following factors, starting with the most relevant:
  • Clearance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Metal type – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface condition – ground elements guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Do not underestimate power

Use magnets with awareness. Their huge power can shock even experienced users. Stay alert and do not underestimate their power.

Material brittleness

Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Implant safety

Patients with a ICD must maintain an safe separation from magnets. The magnetic field can disrupt the operation of the implant.

Adults only

These products are not toys. Swallowing multiple magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates immediate surgery.

Allergy Warning

Certain individuals experience a contact allergy to Ni, which is the common plating for NdFeB magnets. Prolonged contact can result in an allergic reaction. We recommend use protective gloves.

Crushing risk

Pinching hazard: The attraction force is so great that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Thermal limits

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Threat to electronics

Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Flammability

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

Keep away from electronics

Note: neodymium magnets produce a field that interferes with precision electronics. Keep a safe distance from your phone, device, and GPS.

Security! More info about hazards in the article: Magnet Safety Guide.