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MW 8x15 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010102

GTIN/EAN: 5906301811015

5.00

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

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3.44 ZŁ with VAT / pcs + price for transport

2.80 ZŁ net + 23% VAT / pcs

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Technical specification - 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 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

Technical modeling of the product - data

The following data represent the direct effect of a physical calculation. Results are based on models for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - 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 pounds
1470.0 g / 14.4 N
 low risk
1 mm 4511 Gs
451.1 mT
 0.84 kg / 1.85 pounds
837.8 g / 8.2 N
 low risk
2 mm 3262 Gs
326.2 mT
 0.44 kg / 0.97 pounds
438.2 g / 4.3 N
 low risk
3 mm 2332 Gs
233.2 mT
 0.22 kg / 0.49 pounds
224.0 g / 2.2 N
 low risk
5 mm 1238 Gs
123.8 mT
 0.06 kg / 0.14 pounds
63.1 g / 0.6 N
 low risk
10 mm 366 Gs
36.6 mT
 0.01 kg / 0.01 pounds
5.5 g / 0.1 N
 low risk
15 mm 155 Gs
15.5 mT
 0.00 kg / 0.00 pounds
1.0 g / 0.0 N
 low risk
20 mm 80 Gs
8.0 mT
 0.00 kg / 0.00 pounds
0.3 g / 0.0 N
 low risk
30 mm 30 Gs
3.0 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
50 mm 8 Gs
0.8 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Magnetic force drops significantly with every mm of distance. Remember that every additional insulation layer (e.g., contamination, varnish, veneer) significantly diminishes the holding power. Magnets hold most effectively during direct contact; air break kills the power. See how flashily the parameters fall, when the magnet does not adhere flatly to the steel surface. When designing the assembly, discard additional spacers.

Table 2: Sliding 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
The following data presents the estimated shear load required to cause the slippage of the magnet vertically against a vertical steel wall (assuming typical friction). This parameter is a function of the distance between the magnet and the surface.

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
When hanging a element on a upright wall (e.g., a board), it will maintain only about 20%-30% of its maximum pull force. Gravity as well as a low friction coefficient cause that magnets slip faster than they pull off. Designing a vertical fastening? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a much lighter weight. Application of an anti-slip pad can drastically raise the stability.

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
A too thin steel is not enough to focus the entire magnetic field, which squanders power of the holder. Should you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To achieve the maximum of this neodymium's potential, you require a sufficiently solid piece of metal. The material oversaturation causes that on thin elements (e.g., car bodies), the product works worse. We suggest choosing the steel thickness from these parameters.

Table 5: Working in heat (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
Standard neodymium magnets lose power after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly demagnetize this magnet. As the temperature rises, the neodymium's capacity temporarily decreases. Refrain from using this magnet close to ovens higher than its working range. Too high temperature will cause permanent loss of magnetism.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 8x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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
Two magnetic products interact from a much further distance than a neodymium and metal setup. Such a system of two magnets generates a stronger field and a wider radius of performance. Designing a strong closure? Apply two magnets instead of a neodymium and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is huge. The repulsion force is a bit weaker than the attraction, but still impressive.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Figures demonstrate sliding force of dual matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

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
Remote 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
Extremely neodym field poses a real danger to electronics as well as pacemakers. These NdFeB products produce a flux that disrupts operation of digital equipment. Remember: the unseen radiation penetrates the body and housings. Exceptional care must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MW 8x15 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.31 km/h
(4.53 m/s)
 0.06 J
30 mm 28.18 km/h
(7.83 m/s)
 0.17 J
50 mm 36.37 km/h
(10.10 m/s)
 0.29 J
100 mm 51.44 km/h
(14.29 m/s)
 0.58 J
Neodymium magnets are delicate – a strong collision with metal risks their cracking. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can cause material chips or painful pinches to skin. Hold the magnet firmly during installation so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when playing with large magnets.

Table 9: Surface protection spec
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)
The following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MW 8x15 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 306 Mx 33.1 µWb
Pc Coefficient 1.19 High (Stable)
Total magnetic flux emitted by the magnet pole. Key data in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.
1. Shear force

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Temperature resistance

*For standard magnets, the critical 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.

Engineering data and GPSR
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%
Sustainability
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
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This product is an incredibly powerful cylindrical magnet, composed of advanced NdFeB material, which, at dimensions of Ø8x15 mm, guarantees the highest energy density. This specific item features a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 1.47 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, 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 two-component epoxy glues. To ensure long-term durability in automation, 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 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 available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 15 mm. 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 external factors, 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 through the diameter if your project requires it.

Strengths and weaknesses of rare earth magnets.

Pros

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They retain magnetic properties for around ten years – the drop is just ~1% (according to analyses),
  • They are resistant to demagnetization induced by external magnetic fields,
  • A magnet with a smooth silver surface looks better,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
  • Due to the possibility of precise shaping and customization to specialized solutions, neodymium magnets can be created in a wide range of forms and dimensions, which increases their versatility,
  • Significant place in high-tech industry – they find application in hard drives, drive modules, diagnostic systems, and modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their power 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
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited possibility of making threads in the magnet and complex shapes - recommended is a housing - magnetic holder.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • Due to complex production process, their price is relatively high,

Holding force characteristics

Maximum holding power of the magnet – what it depends on?

The load parameter shown represents the limit force, measured under optimal environment, specifically:
  • with the contact of a yoke made of special test steel, ensuring full magnetic saturation
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an ideally smooth touching surface
  • with total lack of distance (no coatings)
  • during detachment in a direction perpendicular to the plane
  • at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

During everyday use, the actual holding force depends on many variables, ranked from most significant:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, 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 generating force.
  • Chemical composition of the base – mild steel gives the best results. Alloy steels reduce magnetic permeability and holding force.
  • Surface quality – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets
GPS and phone interference

Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can ruin the internal compass in your phone.

Operating temperature

Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.

Allergy Warning

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness happens, immediately stop working with magnets and use protective gear.

Safe operation

Handle magnets consciously. Their huge power can surprise even experienced users. Be vigilant and respect their force.

Risk of cracking

NdFeB magnets are ceramic materials, meaning they are very brittle. Collision of two magnets leads to them breaking into shards.

No play value

Adult use only. Tiny parts pose a choking risk, leading to intestinal necrosis. Store away from kids and pets.

Fire warning

Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Health Danger

Warning for patients: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or request help to work with the magnets.

Cards and drives

Intense magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Maintain a gap of at least 10 cm.

Finger safety

Risk of injury: The attraction force is so great that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.

Attention! Learn more about risks in the article: Magnet Safety Guide.