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MW 15x8 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010032

GTIN/EAN: 5906301810315

5.00

Diameter Ø

15 mm [±0,1 mm]

Height

8 mm [±0,1 mm]

Weight

10.6 g

Magnetization Direction

↑ axial

Load capacity

7.37 kg / 72.28 N

Magnetic Induction

451.96 mT / 4520 Gs

Coating

[NiCuNi] Nickel

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4.92 ZŁ with VAT / pcs + price for transport

4.00 ZŁ net + 23% VAT / pcs

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Physical properties - MW 15x8 / N38 - cylindrical magnet

Specification / characteristics - MW 15x8 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010032
GTIN/EAN 5906301810315
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 15 mm [±0,1 mm]
Height 8 mm [±0,1 mm]
Weight 10.6 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.37 kg / 72.28 N
Magnetic Induction ~ ? 451.96 mT / 4520 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 15x8 / 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 - report

Presented values are the direct effect of a physical analysis. Results rely on algorithms for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Use these data as a reference point when designing systems.

Table 1: Static force (force vs gap) - characteristics
MW 15x8 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4518 Gs
451.8 mT
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
 strong
1 mm 3944 Gs
394.4 mT
 5.62 kg / 12.38 pounds
5616.2 g / 55.1 N
 strong
2 mm 3362 Gs
336.2 mT
 4.08 kg / 9.00 pounds
4083.1 g / 40.1 N
 strong
3 mm 2820 Gs
282.0 mT
 2.87 kg / 6.33 pounds
2871.9 g / 28.2 N
 strong
5 mm 1931 Gs
193.1 mT
 1.35 kg / 2.97 pounds
1346.9 g / 13.2 N
 safe
10 mm 763 Gs
76.3 mT
 0.21 kg / 0.46 pounds
210.3 g / 2.1 N
 safe
15 mm 349 Gs
34.9 mT
 0.04 kg / 0.10 pounds
44.0 g / 0.4 N
 safe
20 mm 184 Gs
18.4 mT
 0.01 kg / 0.03 pounds
12.2 g / 0.1 N
 safe
30 mm 68 Gs
6.8 mT
 0.00 kg / 0.00 pounds
1.7 g / 0.0 N
 safe
50 mm 17 Gs
1.7 mT
 0.00 kg / 0.00 pounds
0.1 g / 0.0 N
 safe
Pulling power weakens sharply with every subsequent millimeter of gap. Remember that even a very thin break (e.g., dirt, varnish, veneer) strongly diminishes the holding power. Magnets hold strongest at the point of direct contact; distance kills the power. Analyze how quickly the load capacity plummet, when the product does not adhere directly to the steel surface. When designing the mounting, eliminate redundant distances.

Table 2: Slippage hold (vertical surface)
MW 15x8 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.47 kg / 3.25 pounds
1474.0 g / 14.5 N
1 mm Stal (~0.2) 1.12 kg / 2.48 pounds
1124.0 g / 11.0 N
2 mm Stal (~0.2) 0.82 kg / 1.80 pounds
816.0 g / 8.0 N
3 mm Stal (~0.2) 0.57 kg / 1.27 pounds
574.0 g / 5.6 N
5 mm Stal (~0.2) 0.27 kg / 0.60 pounds
270.0 g / 2.6 N
10 mm Stal (~0.2) 0.04 kg / 0.09 pounds
42.0 g / 0.4 N
15 mm Stal (~0.2) 0.01 kg / 0.02 pounds
8.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 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 approximate weight limit necessary to cause the shifting of the magnet vertically against a upright steel plate (considering typical friction coefficient). The holding force varies with the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 15x8 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.21 kg / 4.87 pounds
2211.0 g / 21.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.47 kg / 3.25 pounds
1474.0 g / 14.5 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.74 kg / 1.62 pounds
737.0 g / 7.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.69 kg / 8.12 pounds
3685.0 g / 36.1 N
When placing a element on a vertical plane (e.g., a board), it will only hold barely about 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient cause that products move down easier than they detach. Planning a hanger? Note that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will give way down under a significantly smaller cargo. Using a rubber coating can significantly raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MW 15x8 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.74 kg / 1.62 pounds
737.0 g / 7.2 N
1 mm
25%
 1.84 kg / 4.06 pounds
1842.5 g / 18.1 N
2 mm
50%
 3.69 kg / 8.12 pounds
3685.0 g / 36.1 N
3 mm
75%
 5.53 kg / 12.19 pounds
5527.5 g / 54.2 N
5 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
10 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
11 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
12 mm
100%
 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
A too thin steel cannot conduct the entire magnetic field, which weakens actual performance of the magnet. If you install a neodymium to a weak sheet, the field will penetrate right through and the holding will be smaller. To squeeze the maximum of this neodymium's power, you require a sufficiently solid backing of steel. The saturation phenomenon means that on delicate walls (e.g., car bodies), the product holds weaker. We advise picking the steel dimension according to the table below.

Table 5: Thermal resistance (stability) - resistance threshold
MW 15x8 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.37 kg / 16.25 pounds
7370.0 g / 72.3 N
 OK
40 °C -2.2% 7.21 kg / 15.89 pounds
7207.9 g / 70.7 N
 OK
60 °C -4.4% 7.05 kg / 15.53 pounds
7045.7 g / 69.1 N
 OK
80 °C -6.6% 6.88 kg / 15.18 pounds
6883.6 g / 67.5 N
100 °C -28.8% 5.25 kg / 11.57 pounds
5247.4 g / 51.5 N
Classic neodymiums change their properties strength past the thermal threshold. Avoid high temperatures – excessive heat can permanently demagnetize this product. As the temperature rises, the magnet's power briefly decreases. Avoid using this magnet close to ovens higher than its working range. Exceeding the critical threshold will result in destruction of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low Pc) may lose charge permanently at lower temperatures than taller cylinders. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 15x8 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 22.23 kg / 49.02 pounds
5 606 Gs
3.34 kg / 7.35 pounds
3335 g / 32.7 N
 N/A
1 mm 19.55 kg / 43.11 pounds
8 473 Gs
2.93 kg / 6.47 pounds
2933 g / 28.8 N
 17.60 kg / 38.80 pounds
~0 Gs
2 mm 16.94 kg / 37.35 pounds
7 887 Gs
2.54 kg / 5.60 pounds
2541 g / 24.9 N
 15.25 kg / 33.62 pounds
~0 Gs
3 mm 14.52 kg / 32.00 pounds
7 301 Gs
2.18 kg / 4.80 pounds
2178 g / 21.4 N
 13.07 kg / 28.80 pounds
~0 Gs
5 mm 10.37 kg / 22.85 pounds
6 169 Gs
1.55 kg / 3.43 pounds
1555 g / 15.3 N
 9.33 kg / 20.57 pounds
~0 Gs
10 mm 4.06 kg / 8.96 pounds
3 862 Gs
0.61 kg / 1.34 pounds
609 g / 6.0 N
 3.66 kg / 8.06 pounds
~0 Gs
20 mm 0.63 kg / 1.40 pounds
1 526 Gs
0.10 kg / 0.21 pounds
95 g / 0.9 N
 0.57 kg / 1.26 pounds
~0 Gs
50 mm 0.01 kg / 0.03 pounds
215 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
60 mm 0.01 kg / 0.01 pounds
136 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
91 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
64 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
46 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
35 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal combination. The connection of two magnets produces a massive flux and a further horizon of performance. Want to build a solid fastener? Utilize two neodymiums instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is huge. The repulsion force is a bit weaker than the attraction, but still large.
*Field value between like poles drops to ~0 Gs at the geometric center between the magnets (caused by magnetic field nullification).
Attention: Results refer to friction force of a pair of same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
MW 15x8 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.0 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
A strong magnetic field is a serious hazard to electronic devices and medical implants. These magnets produce a flux that disrupts operation of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be taken by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MW 15x8 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.06 km/h
(7.52 m/s)
 0.30 J
30 mm 46.07 km/h
(12.80 m/s)
 0.87 J
50 mm 59.46 km/h
(16.52 m/s)
 1.45 J
100 mm 84.09 km/h
(23.36 m/s)
 2.89 J
Magnetic elements are prone to chipping – a collision with steel risks their cracking. Control the attraction moment – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or injury to fingers. Always hold the magnet during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MW 15x8 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 15x8 / N38

Parameter Value SI Unit / Description
Magnetic Flux 8 074 Mx 80.7 µWb
Pc Coefficient 0.61 High (Stable)
Total magnetic flux emitted by the pole surface. Key data in coil applications and motors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MW 15x8 / N38

Environment Effective steel pull Effect
Air (land) 7.37 kg Standard
Water (riverbed) 8.44 kg
(+1.07 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

*Note: On a vertical wall, the magnet holds only a fraction of its perpendicular strength.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) drastically limits 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) = 0.61

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
Chemical composition
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: 010032-2026
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The offered product is an exceptionally strong rod magnet, made from advanced NdFeB material, which, at dimensions of Ø15x8 mm, guarantees the highest energy density. The MW 15x8 / N38 model boasts 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. 7.37 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 72.28 N with a weight of only 10.6 g, this cylindrical magnet 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., 15.1 mm) using epoxy glues. To ensure long-term durability in automation, specialized industrial adhesives 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 professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø15x8), 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 Ø15x8 mm, which, at a weight of 10.6 g, makes it an element with high magnetic energy density. The key parameter here is the holding force amounting to approximately 7.37 kg (force ~72.28 N), which, with such compact dimensions, proves the high power of the NdFeB material. 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 15 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.

Pros and cons of rare earth magnets.

Benefits

Besides their durability, neodymium magnets are valued for these benefits:
  • They retain magnetic properties for around 10 years – the loss is just ~1% (in theory),
  • They feature excellent resistance to magnetism drop due to external magnetic sources,
  • A magnet with a metallic gold surface looks better,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
  • Considering the potential of free molding and customization to custom requirements, NdFeB magnets can be produced in a variety of forms and dimensions, which increases their versatility,
  • Fundamental importance in advanced technology sectors – they serve a role in HDD drives, drive modules, medical equipment, as well as technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Due to limitations in realizing threads and complicated shapes in magnets, we propose using casing - magnetic mount.
  • Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Maximum lifting capacity of the magnet – what affects it?

The force parameter is a result of laboratory testing executed under the following configuration:
  • with the use of a yoke made of special test steel, ensuring full magnetic saturation
  • with a thickness no less than 10 mm
  • with a plane cleaned and smooth
  • with zero gap (no paint)
  • for force applied at a right angle (in the magnet axis)
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Please note that the magnet holding may be lower depending on the following factors, starting with the most relevant:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Do not drill into magnets

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

Safe distance

Avoid bringing magnets close to a purse, computer, or screen. The magnetic field can destroy these devices and erase data from cards.

ICD Warning

For implant holders: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or request help to handle the magnets.

Permanent damage

Control the heat. Heating the magnet to high heat will destroy its properties and pulling force.

Powerful field

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

Nickel allergy

Allergy Notice: The nickel-copper-nickel coating consists of nickel. If an allergic reaction occurs, cease handling magnets and wear gloves.

Physical harm

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

Fragile material

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Product not for children

Only for adults. Tiny parts pose a choking risk, causing serious injuries. Store away from children and animals.

Keep away from electronics

GPS units and mobile phones are highly sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

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