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MW 15x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010029

GTIN/EAN: 5906301810285

5.00

Diameter Ø

15 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

3.98 g

Magnetization Direction

↑ axial

Load capacity

2.87 kg / 28.14 N

Magnetic Induction

230.16 mT / 2302 Gs

Coating

[NiCuNi] Nickel

check properties »

1.624 ZŁ with VAT / pcs + price for transport

1.320 ZŁ net + 23% VAT / pcs

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Technical details - MW 15x3 / N38 - cylindrical magnet

Specification / characteristics - MW 15x3 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010029
GTIN/EAN 5906301810285
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 3 mm [±0,1 mm]
Weight 3.98 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.87 kg / 28.14 N
Magnetic Induction ~ ? 230.16 mT / 2302 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 15x3 / 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 are the direct effect of a engineering analysis. Values were calculated on models for the class Nd2Fe14B. Operational conditions might slightly differ. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs distance) - characteristics
MW 15x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2301 Gs
230.1 mT
 2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
 strong
1 mm 2098 Gs
209.8 mT
 2.39 kg / 5.26 pounds
2386.5 g / 23.4 N
 strong
2 mm 1842 Gs
184.2 mT
 1.84 kg / 4.05 pounds
1838.5 g / 18.0 N
 low risk
3 mm 1570 Gs
157.0 mT
 1.34 kg / 2.95 pounds
1337.0 g / 13.1 N
 low risk
5 mm 1084 Gs
108.4 mT
 0.64 kg / 1.40 pounds
637.0 g / 6.2 N
 low risk
10 mm 410 Gs
41.0 mT
 0.09 kg / 0.20 pounds
91.3 g / 0.9 N
 low risk
15 mm 178 Gs
17.8 mT
 0.02 kg / 0.04 pounds
17.1 g / 0.2 N
 low risk
20 mm 89 Gs
8.9 mT
 0.00 kg / 0.01 pounds
4.3 g / 0.0 N
 low risk
30 mm 31 Gs
3.1 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 low risk
50 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Magnetic force weakens drastically with every subsequent millimeter of spacing. Note that even the smallest gap (e.g., contamination, paint, veneer) noticeably weakens the grip. Neodymiums operate optimally during direct contact; distance weakens the force. Analyze how flashily the pull force plummet, when the magnet does not touch directly to the steel surface. When calculating the mounting, discard additional spacers.

Table 2: Sliding capacity (vertical surface)
MW 15x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.57 kg / 1.27 pounds
574.0 g / 5.6 N
1 mm Stal (~0.2) 0.48 kg / 1.05 pounds
478.0 g / 4.7 N
2 mm Stal (~0.2) 0.37 kg / 0.81 pounds
368.0 g / 3.6 N
3 mm Stal (~0.2) 0.27 kg / 0.59 pounds
268.0 g / 2.6 N
5 mm Stal (~0.2) 0.13 kg / 0.28 pounds
128.0 g / 1.3 N
10 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 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
This section presents the estimated holding capacity required to initiate the slippage of the magnet down on a vertical steel plate (assuming typical friction). The holding force varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - vertical pull
MW 15x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.86 kg / 1.90 pounds
861.0 g / 8.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.57 kg / 1.27 pounds
574.0 g / 5.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.29 kg / 0.63 pounds
287.0 g / 2.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.44 kg / 3.16 pounds
1435.0 g / 14.1 N
When mounting a magnet on a vertical wall (e.g., a fridge), it you can count on just approx. 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip cause that magnets slide down faster than they detach. Planning a hanger? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will give way down under a much lighter load. Application of an anti-slip pad can drastically improve the result.

Table 4: Material efficiency (saturation) - power losses
MW 15x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.29 kg / 0.63 pounds
287.0 g / 2.8 N
1 mm
25%
 0.72 kg / 1.58 pounds
717.5 g / 7.0 N
2 mm
50%
 1.44 kg / 3.16 pounds
1435.0 g / 14.1 N
3 mm
75%
 2.15 kg / 4.75 pounds
2152.5 g / 21.1 N
5 mm
100%
 2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
10 mm
100%
 2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
11 mm
100%
 2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
12 mm
100%
 2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
A thin sheet is not enough to focus the full magnetic flux, which squanders power of the holder. Should you attach a powerful product to a thin surface, the magnetism will pass right through and the holding will be smaller. To utilize 100% of this neodymium's potential, you need a suitably thick element of metal. The saturation phenomenon causes that on thin elements (e.g., car bodies), the magnet shows lower pull force. We recommend selecting the steel cross-section according to the table below.

Table 5: Thermal resistance (stability) - power drop
MW 15x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.87 kg / 6.33 pounds
2870.0 g / 28.2 N
 OK
40 °C -2.2% 2.81 kg / 6.19 pounds
2806.9 g / 27.5 N
 OK
60 °C -4.4% 2.74 kg / 6.05 pounds
2743.7 g / 26.9 N
80 °C -6.6% 2.68 kg / 5.91 pounds
2680.6 g / 26.3 N
100 °C -28.8% 2.04 kg / 4.51 pounds
2043.4 g / 20.0 N
Ordinary NdFeB products lose parameters past the thermal threshold. Watch out for overheating – excessive heat can permanently demagnetize this magnet. With every degree above norm, the magnet's power temporarily drops. Do not use this magnet close to ovens exceeding its operating temperature limit. Ignoring the limit will cause permanent loss of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than taller cylinders. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 15x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.77 kg / 12.72 pounds
3 869 Gs
0.87 kg / 1.91 pounds
865 g / 8.5 N
 N/A
1 mm 5.32 kg / 11.73 pounds
4 419 Gs
0.80 kg / 1.76 pounds
798 g / 7.8 N
 4.79 kg / 10.55 pounds
~0 Gs
2 mm 4.80 kg / 10.57 pounds
4 196 Gs
0.72 kg / 1.59 pounds
719 g / 7.1 N
 4.32 kg / 9.52 pounds
~0 Gs
3 mm 4.25 kg / 9.36 pounds
3 948 Gs
0.64 kg / 1.40 pounds
637 g / 6.2 N
 3.82 kg / 8.42 pounds
~0 Gs
5 mm 3.17 kg / 6.99 pounds
3 412 Gs
0.48 kg / 1.05 pounds
476 g / 4.7 N
 2.85 kg / 6.29 pounds
~0 Gs
10 mm 1.28 kg / 2.82 pounds
2 168 Gs
0.19 kg / 0.42 pounds
192 g / 1.9 N
 1.15 kg / 2.54 pounds
~0 Gs
20 mm 0.18 kg / 0.40 pounds
821 Gs
0.03 kg / 0.06 pounds
28 g / 0.3 N
 0.17 kg / 0.36 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
101 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
62 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
28 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
20 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
15 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 wider radius than a magnet and steel combination. Such a system of two magnets produces a massive flux and a wider radius of action. Planning to create a solid fastener? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the collision energy is extreme. The levitation is a bit weaker than the attraction, but still large.
*Field value for N-N configuration is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
* Calculations demonstrate sliding force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
MW 15x3 / 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) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Powerful magnet radiation is a serious hazard to electronics as well as medical implants. These neodymiums produce a flux that disrupts operation of digital equipment. Remember: the invisible magnetic field passes through tissues and plastic. Exceptional care must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MW 15x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.62 km/h
(7.67 m/s)
 0.12 J
30 mm 46.91 km/h
(13.03 m/s)
 0.34 J
50 mm 60.56 km/h
(16.82 m/s)
 0.56 J
100 mm 85.64 km/h
(23.79 m/s)
 1.13 J
Neodymium magnets are prone to chipping – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Striking energy can destroy the magnet or injury to fingers. Always hold the magnet during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed means shattering of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Corrosion resistance
MW 15x3 / 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 (Pc)
MW 15x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 718 Mx 47.2 µWb
Pc Coefficient 0.29 Low (Flat)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications as well as sensors. The Pc coefficient determines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 15x3 / N38

Environment Effective steel pull Effect
Air (land) 2.87 kg Standard
Water (riverbed) 3.29 kg
(+0.42 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds just ~20% of its max power.

2. Steel saturation

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

3. Temperature resistance

*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) = 0.29

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
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%
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: 010029-2026
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The presented product is a very strong rod magnet, made from advanced NdFeB material, which, with dimensions of Ø15x3 mm, guarantees optimal power. The MW 15x3 / N38 component boasts high dimensional repeatability and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 2.87 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 28.14 N with a weight of only 3.98 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for the majority of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø15x3), 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 Ø15x3 mm, which, at a weight of 3.98 g, makes it an element with high magnetic energy density. The value of 28.14 N means that the magnet is capable of holding a weight many times exceeding its own mass of 3.98 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 15 mm. 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 through the diameter if your project requires it.

Pros and cons of neodymium magnets.

Pros

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • They feature excellent resistance to magnetism drop due to opposing magnetic fields,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Due to the possibility of free shaping and adaptation to individualized requirements, neodymium magnets can be manufactured in a broad palette of shapes and sizes, which amplifies use scope,
  • Wide application in advanced technology sectors – they are utilized in hard drives, electromotive mechanisms, medical devices, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

What to avoid - cons of neodymium magnets: application proposals
  • They are fragile upon too strong 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 demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex forms in magnets, we recommend using casing - magnetic holder.
  • Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Maximum lifting force for a neodymium magnet – what contributes to it?

Breakaway force was defined for the most favorable conditions, including:
  • with the application of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • characterized by lack of roughness
  • 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

Magnet lifting force in use – key factors

During everyday use, the actual lifting capacity depends on a number of factors, listed from crucial:
  • Clearance – existence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, 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 lowers the lifting capacity.

Precautions when working with NdFeB magnets
Demagnetization risk

Monitor thermal conditions. Heating the magnet to high heat will destroy its magnetic structure and strength.

Danger to the youngest

Adult use only. Tiny parts can be swallowed, leading to severe trauma. Keep out of reach of children and animals.

Threat to electronics

Avoid bringing magnets near a wallet, laptop, or screen. The magnetism can permanently damage these devices and wipe information from cards.

Bodily injuries

Pinching hazard: The attraction force is so immense that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Threat to navigation

A powerful magnetic field negatively affects the operation of compasses in phones and navigation systems. Maintain magnets near a device to prevent breaking the sensors.

Medical implants

Medical warning: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Eye protection

Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Immense force

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

Metal Allergy

It is widely known that nickel (the usual finish) is a potent allergen. If you have an allergy, prevent direct skin contact or opt for versions in plastic housing.

Fire warning

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

Caution! Details about risks in the article: Magnet Safety Guide.