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MW 15x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010030

GTIN/EAN: 5906301810292

5.00

Diameter Ø

15 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

5.3 g

Magnetization Direction

↑ axial

Load capacity

4.22 kg / 41.38 N

Magnetic Induction

291.60 mT / 2916 Gs

Coating

[NiCuNi] Nickel

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1.968 ZŁ with VAT / pcs + price for transport

1.600 ZŁ net + 23% VAT / pcs

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Technical of the product - MW 15x4 / N38 - cylindrical magnet

Specification / characteristics - MW 15x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010030
GTIN/EAN 5906301810292
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 4 mm [±0,1 mm]
Weight 5.3 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.22 kg / 41.38 N
Magnetic Induction ~ ? 291.60 mT / 2916 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 15x4 / 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 analysis of the magnet - report

The following data represent the result of a mathematical calculation. Results rely on algorithms for the class Nd2Fe14B. Actual performance may deviate from the simulation results. Treat these data as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
MW 15x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2915 Gs
291.5 mT
 4.22 kg / 9.30 lbs
4220.0 g / 41.4 N
 medium risk
1 mm 2620 Gs
262.0 mT
 3.41 kg / 7.51 lbs
3408.2 g / 33.4 N
 medium risk
2 mm 2276 Gs
227.6 mT
 2.57 kg / 5.67 lbs
2571.6 g / 25.2 N
 medium risk
3 mm 1928 Gs
192.8 mT
 1.85 kg / 4.07 lbs
1845.5 g / 18.1 N
 low risk
5 mm 1324 Gs
132.4 mT
 0.87 kg / 1.92 lbs
870.3 g / 8.5 N
 low risk
10 mm 505 Gs
50.5 mT
 0.13 kg / 0.28 lbs
126.7 g / 1.2 N
 low risk
15 mm 222 Gs
22.2 mT
 0.02 kg / 0.05 lbs
24.4 g / 0.2 N
 low risk
20 mm 113 Gs
11.3 mT
 0.01 kg / 0.01 lbs
6.3 g / 0.1 N
 low risk
30 mm 40 Gs
4.0 mT
 0.00 kg / 0.00 lbs
0.8 g / 0.0 N
 low risk
50 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 low risk
Grip strength decreases significantly per each millimeter of gap. Note that even a microscopic distance (e.g., contamination, paint, rust) strongly diminishes the holding power. Magnets operate most effectively at the point of direct contact; gap drastically cuts the force. See how rapidly the pull force fall, when the product does not adhere tightly to the steel surface. When designing the arrangement, eliminate additional spacers.

Table 2: Slippage capacity (vertical surface)
MW 15x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.84 kg / 1.86 lbs
844.0 g / 8.3 N
1 mm Stal (~0.2) 0.68 kg / 1.50 lbs
682.0 g / 6.7 N
2 mm Stal (~0.2) 0.51 kg / 1.13 lbs
514.0 g / 5.0 N
3 mm Stal (~0.2) 0.37 kg / 0.82 lbs
370.0 g / 3.6 N
5 mm Stal (~0.2) 0.17 kg / 0.38 lbs
174.0 g / 1.7 N
10 mm Stal (~0.2) 0.03 kg / 0.06 lbs
26.0 g / 0.3 N
15 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 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 following data defines the theoretical shear load required to cause the downward movement of the magnet down against a upright steel plate (considering standard friction coefficient). This parameter varies with the air gap between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 15x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.27 kg / 2.79 lbs
1266.0 g / 12.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.84 kg / 1.86 lbs
844.0 g / 8.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.42 kg / 0.93 lbs
422.0 g / 4.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
When mounting a holder on a vertical wall (e.g., a fridge), it will maintain just about 20%-30% of its nominal power. Gravitational force as well as a low friction coefficient cause that magnets slip faster than they detach. Designing a vertical fastening? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the element will slide down under a much lighter cargo. Utilizing a rubberized coating can drastically raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MW 15x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.42 kg / 0.93 lbs
422.0 g / 4.1 N
1 mm
25%
 1.06 kg / 2.33 lbs
1055.0 g / 10.3 N
2 mm
50%
 2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
3 mm
75%
 3.17 kg / 6.98 lbs
3165.0 g / 31.0 N
5 mm
100%
 4.22 kg / 9.30 lbs
4220.0 g / 41.4 N
10 mm
100%
 4.22 kg / 9.30 lbs
4220.0 g / 41.4 N
11 mm
100%
 4.22 kg / 9.30 lbs
4220.0 g / 41.4 N
12 mm
100%
 4.22 kg / 9.30 lbs
4220.0 g / 41.4 N
A too thin steel is unable to focus the entire magnetic field, which weakens actual performance of the magnet. Should you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To utilize full efficiency of this magnet's power, you need a suitably thick element of steel. The saturation effect means that on sheet metal structures (e.g., thin profiles), the holder shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal stability (stability) - thermal limit
MW 15x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.22 kg / 9.30 lbs
4220.0 g / 41.4 N
 OK
40 °C -2.2% 4.13 kg / 9.10 lbs
4127.2 g / 40.5 N
 OK
60 °C -4.4% 4.03 kg / 8.89 lbs
4034.3 g / 39.6 N
80 °C -6.6% 3.94 kg / 8.69 lbs
3941.5 g / 38.7 N
100 °C -28.8% 3.00 kg / 6.62 lbs
3004.6 g / 29.5 N
Classic neodymiums lose parameters past the thermal threshold. Watch out for overheating – heat can irreversibly destroy this product. With every degree above norm, the neodymium's power briefly decreases. Avoid using this product close to heaters exceeding its working range. Ignoring the limit will cause permanent loss of magnetic properties.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than long magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MW 15x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.26 kg / 20.41 lbs
4 518 Gs
1.39 kg / 3.06 lbs
1389 g / 13.6 N
 N/A
1 mm 8.40 kg / 18.53 lbs
5 555 Gs
1.26 kg / 2.78 lbs
1261 g / 12.4 N
 7.56 kg / 16.68 lbs
~0 Gs
2 mm 7.48 kg / 16.48 lbs
5 239 Gs
1.12 kg / 2.47 lbs
1122 g / 11.0 N
 6.73 kg / 14.84 lbs
~0 Gs
3 mm 6.54 kg / 14.42 lbs
4 901 Gs
0.98 kg / 2.16 lbs
981 g / 9.6 N
 5.89 kg / 12.98 lbs
~0 Gs
5 mm 4.80 kg / 10.59 lbs
4 200 Gs
0.72 kg / 1.59 lbs
721 g / 7.1 N
 4.32 kg / 9.53 lbs
~0 Gs
10 mm 1.91 kg / 4.21 lbs
2 648 Gs
0.29 kg / 0.63 lbs
286 g / 2.8 N
 1.72 kg / 3.79 lbs
~0 Gs
20 mm 0.28 kg / 0.61 lbs
1 010 Gs
0.04 kg / 0.09 lbs
42 g / 0.4 N
 0.25 kg / 0.55 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
128 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.00 lbs
79 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
52 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
36 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
26 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
19 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
Two magnets interact from a significantly greater distance than a magnet and sheet combination. Such a system of two magnets creates a more powerful interaction and a larger range of operation. Planning to create a strong closure? Apply two magnets instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the collision energy is huge. The levitation is slightly lower than the connection force, but still significant.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Note: Estimates apply to friction force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
MW 15x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 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
Remote 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
Extremely neodym field poses a serious hazard to electronics as well as pacemakers. These neodymiums generate a flux that disrupts operation of digital equipment. Remember: the invisible magnetic field acts through matter and plastic. Special caution must be exercised by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MW 15x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.99 km/h
(8.05 m/s)
 0.17 J
30 mm 49.30 km/h
(13.69 m/s)
 0.50 J
50 mm 63.63 km/h
(17.68 m/s)
 0.83 J
100 mm 89.99 km/h
(25.00 m/s)
 1.66 J
NdFeB products are very brittle – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can cause material chips or painful pinches to skin. Hold the magnet firmly during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when working with large magnets.

Table 9: Anti-corrosion coating durability
MW 15x4 / 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 15x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 659 Mx 56.6 µWb
Pc Coefficient 0.37 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter when building generators and motors. The Pc coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
MW 15x4 / N38

Environment Effective steel pull Effect
Air (land) 4.22 kg Standard
Water (riverbed) 4.83 kg
(+0.61 kg buoyancy gain)
+14.5%
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. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

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

2. Efficiency vs thickness

*Thin steel (e.g. computer case) severely limits the holding force.

3. Thermal stability

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.37

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 and environmental data
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: 010030-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
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This product is an exceptionally strong rod magnet, produced from durable NdFeB material, which, at dimensions of Ø15x4 mm, guarantees maximum efficiency. This specific item boasts high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 4.22 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.
It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 41.38 N with a weight of only 5.3 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 15.1 mm) using two-component epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø15x4), 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 Ø15x4 mm, which, at a weight of 5.3 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 4.22 kg (force ~41.38 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, 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 standard 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.

Advantages as well as disadvantages of rare earth magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
  • They possess excellent resistance to magnetism drop due to external magnetic sources,
  • Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an clean appearance,
  • Magnets possess very high magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of detailed modeling and adjusting to concrete conditions,
  • Huge importance in advanced technology sectors – they serve a role in data components, motor assemblies, precision medical tools, and complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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
  • 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, in case of application outdoors
  • Limited possibility of creating nuts in the magnet and complex forms - recommended is a housing - magnetic holder.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Maximum magnetic pulling force – what affects it?

The declared magnet strength represents the limit force, obtained under ideal test conditions, namely:
  • with the use of a yoke made of low-carbon steel, ensuring full magnetic saturation
  • with a cross-section of at least 10 mm
  • with an polished touching surface
  • without the slightest insulating layer between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Holding efficiency impacted by working environment parameters, including (from priority):
  • Clearance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
  • Direction of force – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Steel type – mild steel gives the best results. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Temperature – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate lowers the holding force.

Warnings
Eye protection

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Threat to electronics

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

Pinching danger

Protect your hands. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Swallowing risk

Product intended for adults. Tiny parts can be swallowed, leading to severe trauma. Store out of reach of children and animals.

Compass and GPS

GPS units and mobile phones are extremely susceptible to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Machining danger

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Respect the power

Use magnets with awareness. Their immense force can shock even experienced users. Be vigilant and do not underestimate their force.

Heat sensitivity

Avoid heat. NdFeB magnets are sensitive to heat. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).

ICD Warning

Patients with a ICD should keep an absolute distance from magnets. The magnetic field can stop the operation of the implant.

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, cease handling magnets and use protective gear.

Danger! Details about hazards in the article: Magnet Safety Guide.