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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

technical specifications »

1.968 ZŁ with VAT / pcs + price for transport

1.600 ZŁ net + 23% VAT / pcs

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Physical properties - 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

Technical simulation of the product - technical parameters

Presented values represent the direct effect of a engineering calculation. Results rely on algorithms for the material Nd2Fe14B. Actual conditions might slightly deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.

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
 warning
1 mm 2620 Gs
262.0 mT
 3.41 kg / 7.51 lbs
3408.2 g / 33.4 N
 warning
2 mm 2276 Gs
227.6 mT
 2.57 kg / 5.67 lbs
2571.6 g / 25.2 N
 warning
3 mm 1928 Gs
192.8 mT
 1.85 kg / 4.07 lbs
1845.5 g / 18.1 N
 weak grip
5 mm 1324 Gs
132.4 mT
 0.87 kg / 1.92 lbs
870.3 g / 8.5 N
 weak grip
10 mm 505 Gs
50.5 mT
 0.13 kg / 0.28 lbs
126.7 g / 1.2 N
 weak grip
15 mm 222 Gs
22.2 mT
 0.02 kg / 0.05 lbs
24.4 g / 0.2 N
 weak grip
20 mm 113 Gs
11.3 mT
 0.01 kg / 0.01 lbs
6.3 g / 0.1 N
 weak grip
30 mm 40 Gs
4.0 mT
 0.00 kg / 0.00 lbs
0.8 g / 0.0 N
 weak grip
50 mm 10 Gs
1.0 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 weak grip
Magnetic force drops drastically with every mm of gap. Keep in mind that every additional insulation layer (e.g., dirt, paint, dust) strongly weakens the grip. Neodymiums work most effectively during direct contact; air break drastically cuts the force. Notice how quickly the pull force fall, when the product does not adhere tightly to the steel surface. When planning the arrangement, avoid additional spacers.

Table 2: Shear load (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 table below presents the approximate weight limit required to cause the slippage of the magnet downwards along a vertical steel wall (assuming typical friction coefficient). This value is relative to the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
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 placing a element on a upright surface (e.g., a board), it will only hold only about 1/5 of its maximum pull force. Gravitational force and a low friction coefficient influence the fact that holders move down faster than they pull off. Want to create a hanger? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will give way down under a noticeably lighter cargo. Utilizing a rubberized coating can significantly increase the grip.

Table 4: Steel thickness (substrate influence) - 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 thin sheet cannot conduct the entire magnetic field, which weakens actual performance of the holder. Should you attach a powerful product to a weak sheet, the field will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you need a suitably thick element of metal. The material oversaturation means that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal stability (material behavior) - 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
Standard neodymium magnets change their properties strength after exceeding the maximum temperature. Avoid high temperatures – high temperature can irreversibly demagnetize this magnet. With increasing heat, the magnet's force momentarily drops. Avoid using this product in hot environments higher than its working range. Too high temperature will result in permanent loss of magnetism.
*Engineering note: Temperature resistance is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) risk losing magnetic properties at lower temperatures compared to rod magnets. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
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 magnetic products interact from a wider radius than a neodymium and metal setup. The connection of magnet-to-magnet generates a stronger field and a larger range of performance. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the collision energy is extreme. The repulsion force is slightly lower than the connection force, but still large.
*Field value in repulsion mode is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).
* Calculations apply to shear force of a pair of matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - 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
Timepiece 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 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 is a large risk to electronic devices as well as medical implants. These magnets produce a field that prevents correct functioning of digital equipment. Notice: the unseen radiation penetrates the body and glass. Special caution must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
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
Magnetic elements are delicate – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Striking energy can trigger coating fragments or injury to skin. Be sure to control the product during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when handling with powerful specimens.

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 passing through the magnet pole. Essential parameter for generator designers and motors. The Pc coefficient determines the magnet's operating point.

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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains merely ~20% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For standard magnets, the critical 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 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: 010030-2026
Magnet Unit Converter
Force (pull)
Magnetic Field
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The offered product is a very strong cylindrical magnet, made from advanced NdFeB material, which, with dimensions of Ø15x4 mm, guarantees the highest energy density. The MW 15x4 / N38 component boasts high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 4.22 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 41.38 N with a weight of only 5.3 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 industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering a great economic balance and operational stability. 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 available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 15 mm and height 4 mm. The value of 41.38 N means that the magnet is capable of holding a weight many times exceeding its own mass of 5.3 g. 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. 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.

Strengths and weaknesses of neodymium magnets.

Strengths

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They have stable power, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • In other words, due to the reflective surface of nickel, the element becomes visually attractive,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
  • Thanks to modularity in forming and the ability to customize to client solutions,
  • Universal use in innovative solutions – they are commonly used in magnetic memories, electromotive mechanisms, advanced medical instruments, also industrial machines.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • We recommend a housing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Health risk related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Maximum lifting capacity of the magnet – what affects it?

Magnet power is the result of a measurement for ideal contact conditions, assuming:
  • using a sheet made of mild steel, acting as a magnetic yoke
  • with a thickness of at least 10 mm
  • with a surface perfectly flat
  • without any insulating layer between the magnet and steel
  • under vertical force vector (90-degree angle)
  • in neutral thermal conditions

Determinants of lifting force in real conditions

In real-world applications, the actual lifting capacity depends on many variables, presented from crucial:
  • Clearance – the presence of foreign body (paint, tape, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
  • Plate texture – ground elements ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

Safe handling of neodymium magnets
Allergy Warning

Some people suffer from a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling might lead to an allergic reaction. We suggest use safety gloves.

Medical interference

For implant holders: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or ask another person to work with the magnets.

Beware of splinters

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.

Crushing force

Danger of trauma: The pulling power is so great that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Powerful field

Use magnets with awareness. Their huge power can shock even professionals. Plan your moves and do not underestimate their force.

Demagnetization risk

Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

This is not a toy

Product intended for adults. Tiny parts pose a choking risk, leading to serious injuries. Store away from children and animals.

Machining danger

Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.

Keep away from electronics

A strong magnetic field disrupts the operation of compasses in phones and GPS navigation. Keep magnets near a smartphone to avoid breaking the sensors.

Keep away from computers

Equipment safety: Strong magnets can damage payment cards and sensitive devices (heart implants, hearing aids, timepieces).

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