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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

1.624 with VAT / pcs + price for transport

1.320 ZŁ net + 23% VAT / pcs

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Physical properties - 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

Engineering modeling of the magnet - data

Presented values are the direct effect of a engineering analysis. Results were calculated on models for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Please consider these calculations as a reference point for designers.

Table 1: Static pull force (force vs gap) - power drop
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
medium risk
1 mm 2098 Gs
209.8 mT
2.39 kg / 5.26 pounds
2386.5 g / 23.4 N
medium risk
2 mm 1842 Gs
184.2 mT
1.84 kg / 4.05 pounds
1838.5 g / 18.0 N
weak grip
3 mm 1570 Gs
157.0 mT
1.34 kg / 2.95 pounds
1337.0 g / 13.1 N
weak grip
5 mm 1084 Gs
108.4 mT
0.64 kg / 1.40 pounds
637.0 g / 6.2 N
weak grip
10 mm 410 Gs
41.0 mT
0.09 kg / 0.20 pounds
91.3 g / 0.9 N
weak grip
15 mm 178 Gs
17.8 mT
0.02 kg / 0.04 pounds
17.1 g / 0.2 N
weak grip
20 mm 89 Gs
8.9 mT
0.00 kg / 0.01 pounds
4.3 g / 0.0 N
weak grip
30 mm 31 Gs
3.1 mT
0.00 kg / 0.00 pounds
0.5 g / 0.0 N
weak grip
50 mm 7 Gs
0.7 mT
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
weak grip

Table 2: Vertical load (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

Table 3: Wall mounting (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

Table 4: Steel thickness (substrate influence) - 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

Table 5: Thermal stability (material behavior) - resistance threshold
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

Table 6: Two magnets (attraction) - field collision
MW 15x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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

Table 7: Safety (HSE) (electronics) - warnings
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
Mechanical watch 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

Table 8: Collisions (kinetic energy) - collision effects
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

Table 9: Coating parameters (durability)
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)

Table 10: Construction data (Flux)
MW 15x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 4 718 Mx 47.2 µWb
Pc Coefficient 0.29 Low (Flat)

Table 11: Submerged application
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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

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

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.29

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
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: 010029-2026
Quick Unit Converter
Magnet pull force

Field Strength

Other offers

This product is an incredibly powerful rod magnet, manufactured from durable NdFeB material, which, at dimensions of Ø15x3 mm, guarantees the highest energy density. The MW 15x3 / N38 model boasts a tolerance of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 2.87 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 28.14 N with a weight of only 3.98 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, 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 are safe for nickel 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 even stronger magnets in the same volume (Ø15x3), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
This model is characterized by dimensions Ø15x3 mm, which, at a weight of 3.98 g, makes it an element with impressive magnetic energy density. The key parameter here is the holding force amounting to approximately 2.87 kg (force ~28.14 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 3 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.

Pros and cons of neodymium magnets.

Benefits

Apart from their superior power, neodymium magnets have these key benefits:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • Magnets very well protect themselves against loss of magnetization caused by foreign field sources,
  • By applying a reflective layer of nickel, the element has an professional look,
  • Magnetic induction on the surface of the magnet is maximum,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise forming and optimizing to concrete needs,
  • Versatile presence in modern technologies – they are commonly used in magnetic memories, drive modules, advanced medical instruments, as well as modern systems.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Due to limitations in creating nuts and complex forms in magnets, we recommend using casing - magnetic mount.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these products are able to be problematic in diagnostics medical in case of swallowing.
  • With mass production the cost of neodymium magnets is a challenge,

Pull force analysis

Best holding force of the magnet in ideal parameterswhat affects it?

Holding force of 2.87 kg is a measurement result performed under specific, ideal conditions:
  • with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • with a thickness of at least 10 mm
  • with an polished contact surface
  • under conditions of ideal adhesion (metal-to-metal)
  • under perpendicular force vector (90-degree angle)
  • at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

In real-world applications, the actual holding force is determined by many variables, ranked from most significant:
  • Clearance – existence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Cast iron may attract less.
  • Surface quality – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was determined with the use of a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets
Protect data

Avoid bringing magnets near a wallet, computer, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.

Metal Allergy

Medical facts indicate that nickel (the usual finish) is a strong allergen. If you have an allergy, prevent direct skin contact or choose encased magnets.

Keep away from children

Always store magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are fatal.

Medical implants

Individuals with a ICD should keep an large gap from magnets. The magnetism can stop the operation of the implant.

Crushing force

Risk of injury: The pulling power is so great that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.

Impact on smartphones

GPS units and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Do not overheat magnets

Watch the temperature. Heating the magnet to high heat will ruin its magnetic structure and strength.

Protective goggles

Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Do not underestimate power

Use magnets consciously. Their immense force can shock even professionals. Be vigilant and respect their force.

Combustion hazard

Dust created during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

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