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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

technical specifications »

3.44 ZŁ with VAT / pcs + price for transport

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Technical - 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

Physical analysis of the assembly - technical parameters

The following information constitute the direct effect of a engineering simulation. Results rely on models for the material Nd2Fe14B. Operational conditions might slightly differ. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static pull 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 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
Pulling power weakens significantly with every mm of distance. Note that even a very thin break (e.g., contamination, paint, dust) significantly diminishes the holding power. Magnets hold most effectively in perfect adhesion; gap drastically cuts the force. See how quickly the pull force drop, when the magnet does not adhere directly to the metal substrate. When planning the mounting, avoid redundant distances.

Table 2: Vertical capacity (wall)
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
The table below defines the theoretical shear load necessary to initiate the shifting of the magnet downwards against a upright steel wall (assuming standard friction). This value varies with the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 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
When mounting a holder on a vertical wall (e.g., a car body), it will maintain just approx. 20%-30% of its nominal power. Gravitational force and a weak degree of grip influence the fact that products move down easier than they pull off. Designing a hanger? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the magnet will give way down under a much lighter load. Using a rubber coating can significantly raise the stability.

Table 4: Material efficiency (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
A thin sheet is unable to take in 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 holding will be smaller. To achieve full efficiency of this magnet's power, you need a suitably thick backing of metal. The saturation effect causes that on delicate walls (e.g., appliance housings), the holder works worse. We recommend selecting the steel dimension from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
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
Classic neodymiums change their properties power after exceeding the maximum temperature. Protect against heat – high temperature can irreversibly demagnetize this magnet. With every degree above norm, the neodymium's capacity momentarily lowers. Avoid using this product close to ovens exceeding its working range. Ignoring the limit will cause irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (pancake types) risk losing magnetic properties at lower temperatures than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MW 8x15 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (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
Two magnetic products attract each other from a significantly greater distance than a neodymium and metal combination. The connection of two magnets generates a stronger field and a further horizon of operation. Want to build a solid fastener? Apply two magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the impact force is massive. The repulsion force is marginally weaker than the attraction, but still large.
*The magnetic induction in repulsion mode reaches ~0 Gs at the geometric center of the gap (due to field cancellation).
* Calculations refer to shear force of a pair of same neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - warnings
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
Powerful magnet radiation poses a large risk to electronics as well as pacemakers. These magnets produce a field that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic 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
NdFeB products are delicate – a violent impact against metal risks their cracking. Watch the impact speed – a magnet released freely becomes dangerous. Impact energy can cause material chips or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't hit violently against the metal. A collision at high speed ends with a crack of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Coating parameters (durability)
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: 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)
Total magnetic flux passing through the magnet pole. Essential parameter in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Caution: On a vertical wall, the magnet retains just a fraction of its nominal pull.

2. Plate thickness effect

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

3. Power loss vs temp

*For N38 material, 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.

Technical specification and ecology
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%
Environmental data
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
Magnet Unit Converter
Magnet pull force
Magnetic Induction
Input your figure in one of the inputs, to see all other values convert on the fly.

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The offered product is an exceptionally strong rod magnet, made from durable NdFeB material, which, with dimensions of Ø8x15 mm, guarantees optimal power. This specific item features high dimensional repeatability and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 1.47 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 14.45 N with a weight of only 5.65 g, this rod is indispensable in electronics 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 90% of applications in modeling and machine building, where extreme 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 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 protects the surface 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. 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.

Pros

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose power, even during approximately 10 years – the drop in lifting capacity is only ~1% (theoretically),
  • They possess excellent resistance to magnetic field loss as a result of external fields,
  • By covering with a lustrous layer of silver, the element acquires an proper look,
  • Magnets have huge magnetic induction on the surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of accurate machining as well as adapting to complex applications,
  • Wide application in future technologies – they find application in HDD drives, motor assemblies, medical equipment, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in compact constructions

Limitations

Disadvantages of NdFeB magnets:
  • They are prone to damage 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.
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of producing threads in the magnet and complicated forms - preferred is cover - mounting mechanism.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Additionally, tiny parts of these products can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum magnetic pulling force – what contributes to it?

Breakaway force was defined for the most favorable conditions, assuming:
  • with the use of a yoke made of low-carbon steel, ensuring maximum field concentration
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with a plane free of scratches
  • with zero gap (no coatings)
  • under perpendicular application of breakaway force (90-degree angle)
  • at temperature room level

Lifting capacity in real conditions – factors

Holding efficiency is affected by working environment parameters, mainly (from most important):
  • Distance (between the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel grade – ideal substrate is high-permeability steel. Cast iron may attract less.
  • Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the load capacity.

Warnings
Adults only

Strictly store magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are tragic.

Metal Allergy

Certain individuals have a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Frequent touching can result in dermatitis. We strongly advise wear protective gloves.

ICD Warning

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

Respect the power

Be careful. Neodymium magnets act from a distance and snap with huge force, often faster than you can move away.

Shattering risk

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets will cause them shattering into shards.

Dust is flammable

Dust generated during grinding of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Electronic devices

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

Heat warning

Regular neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.

GPS Danger

Note: neodymium magnets generate a field that disrupts sensitive sensors. Keep a safe distance from your mobile, tablet, and GPS.

Pinching danger

Big blocks can crush fingers instantly. Never put your hand betwixt two strong magnets.

Safety First! Want to know more? Check our post: Are neodymium magnets dangerous?