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MW 4x6 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010078

GTIN/EAN: 5906301810773

5.00

Diameter Ø

4 mm [±0,1 mm]

Height

6 mm [±0,1 mm]

Weight

0.57 g

Magnetization Direction

↑ axial

Load capacity

0.41 kg / 4.06 N

Magnetic Induction

586.32 mT / 5863 Gs

Coating

[NiCuNi] Nickel

technical specifications »

0.381 ZŁ with VAT / pcs + price for transport

0.310 ZŁ net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical - MW 4x6 / N38 - cylindrical magnet

Specification / characteristics - MW 4x6 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010078
GTIN/EAN 5906301810773
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 4 mm [±0,1 mm]
Height 6 mm [±0,1 mm]
Weight 0.57 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.41 kg / 4.06 N
Magnetic Induction ~ ? 586.32 mT / 5863 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 4x6 / 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 - data

Presented values constitute the outcome of a physical analysis. Values are based on models for the material Nd2Fe14B. Real-world parameters may differ from theoretical values. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
MW 4x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5852 Gs
585.2 mT
 0.41 kg / 0.90 lbs
410.0 g / 4.0 N
 safe
1 mm 3189 Gs
318.9 mT
 0.12 kg / 0.27 lbs
121.7 g / 1.2 N
 safe
2 mm 1631 Gs
163.1 mT
 0.03 kg / 0.07 lbs
31.8 g / 0.3 N
 safe
3 mm 894 Gs
89.4 mT
 0.01 kg / 0.02 lbs
9.6 g / 0.1 N
 safe
5 mm 343 Gs
34.3 mT
 0.00 kg / 0.00 lbs
1.4 g / 0.0 N
 safe
10 mm 73 Gs
7.3 mT
 0.00 kg / 0.00 lbs
0.1 g / 0.0 N
 safe
15 mm 26 Gs
2.6 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 safe
20 mm 13 Gs
1.3 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 safe
30 mm 4 Gs
0.4 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 safe
50 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 safe
Grip strength decreases drastically per each millimeter of distance. Keep in mind that even a very thin break (e.g., dirt, varnish, dust) strongly reduces the pull force. Neodymiums hold optimally during direct contact; air break nullifies the power. See how rapidly the pull force drop, when the product does not adhere flatly to the steel surface. When designing the arrangement, discard additional spacers.

Table 2: Vertical capacity (vertical surface)
MW 4x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.08 kg / 0.18 lbs
82.0 g / 0.8 N
1 mm Stal (~0.2) 0.02 kg / 0.05 lbs
24.0 g / 0.2 N
2 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
3 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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
This section defines the theoretical weight limit sufficient to cause the slippage of the magnet vertically on a upright steel wall (assuming typical friction coefficient). The holding force is a function of the separation distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MW 4x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.12 kg / 0.27 lbs
123.0 g / 1.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.08 kg / 0.18 lbs
82.0 g / 0.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.04 kg / 0.09 lbs
41.0 g / 0.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.21 kg / 0.45 lbs
205.0 g / 2.0 N
When mounting a holder on a upright plane (e.g., a fridge), it will only hold only approx. 20%-30% of its maximum pull force. Gravity and a weak degree of grip mean that products slide down faster than they detach. Planning a wall mount? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the holder will slide down under a noticeably lighter weight. Application of an anti-slip pad can drastically raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 4x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.04 kg / 0.09 lbs
41.0 g / 0.4 N
1 mm
25%
 0.10 kg / 0.23 lbs
102.5 g / 1.0 N
2 mm
50%
 0.21 kg / 0.45 lbs
205.0 g / 2.0 N
3 mm
75%
 0.31 kg / 0.68 lbs
307.5 g / 3.0 N
5 mm
100%
 0.41 kg / 0.90 lbs
410.0 g / 4.0 N
10 mm
100%
 0.41 kg / 0.90 lbs
410.0 g / 4.0 N
11 mm
100%
 0.41 kg / 0.90 lbs
410.0 g / 4.0 N
12 mm
100%
 0.41 kg / 0.90 lbs
410.0 g / 4.0 N
A thin metal plate is not enough to focus the entire magnetic field, which wastes potential of the magnet. If you mount a strong magnet to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To squeeze the maximum of this magnet's potential, you need a suitably thick piece of metal. The material oversaturation means that on thin elements (e.g., appliance housings), the product shows lower pull force. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (stability) - power drop
MW 4x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.41 kg / 0.90 lbs
410.0 g / 4.0 N
 OK
40 °C -2.2% 0.40 kg / 0.88 lbs
401.0 g / 3.9 N
 OK
60 °C -4.4% 0.39 kg / 0.86 lbs
392.0 g / 3.8 N
 OK
80 °C -6.6% 0.38 kg / 0.84 lbs
382.9 g / 3.8 N
100 °C -28.8% 0.29 kg / 0.64 lbs
291.9 g / 2.9 N
Standard neodymium magnets irreversibly lose strength past the thermal threshold. Avoid high temperatures – high temperature can permanently demagnetize this product. As the temperature rises, the magnet's power momentarily decreases. Refrain from using this magnet in hot environments exceeding its operating temperature limit. Exceeding the critical threshold will cause permanent loss of magnetism.
*Engineering note: Heat tolerance is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) may lose charge permanently at lower temperatures compared to rod magnets. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
MW 4x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 2.65 kg / 5.85 lbs
6 085 Gs
0.40 kg / 0.88 lbs
398 g / 3.9 N
 N/A
1 mm 1.51 kg / 3.34 lbs
8 844 Gs
0.23 kg / 0.50 lbs
227 g / 2.2 N
 1.36 kg / 3.01 lbs
~0 Gs
2 mm 0.79 kg / 1.74 lbs
6 377 Gs
0.12 kg / 0.26 lbs
118 g / 1.2 N
 0.71 kg / 1.56 lbs
~0 Gs
3 mm 0.40 kg / 0.88 lbs
4 541 Gs
0.06 kg / 0.13 lbs
60 g / 0.6 N
 0.36 kg / 0.79 lbs
~0 Gs
5 mm 0.11 kg / 0.24 lbs
2 388 Gs
0.02 kg / 0.04 lbs
17 g / 0.2 N
 0.10 kg / 0.22 lbs
~0 Gs
10 mm 0.01 kg / 0.02 lbs
687 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
20 mm 0.00 kg / 0.00 lbs
145 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
 0.00 kg / 0.00 lbs
~0 Gs
50 mm 0.00 kg / 0.00 lbs
14 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
8 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
5 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
4 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
3 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
2 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 much further distance than a neodymium and metal setup. The setup of two magnets creates a more powerful interaction and a wider radius of performance. Designing a powerful holder? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the impact force is extreme. The levitation is slightly lower than the attraction, but still impressive.
*Flux density between like poles is approximately ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Attention: Results apply to sliding force of dual matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (electronics) - warnings
MW 4x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 3.0 cm
Hearing aid 10 Gs (1.0 mT) 2.5 cm
Mechanical watch 20 Gs (2.0 mT) 2.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 1.5 cm
Remote 50 Gs (5.0 mT) 1.5 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm
A strong magnetic field is a large risk to IT equipment as well as medical implants. These neodymiums produce a field that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be exercised 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, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MW 4x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.05 km/h
(7.51 m/s)
 0.02 J
30 mm 46.85 km/h
(13.01 m/s)
 0.05 J
50 mm 60.48 km/h
(16.80 m/s)
 0.08 J
100 mm 85.53 km/h
(23.76 m/s)
 0.16 J
NdFeB products are delicate – a violent impact against metal causes immediate chipping. Watch the impact speed – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or dangerous crushing to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (durability)
MW 4x6 / 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. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Pc)
MW 4x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 792 Mx 7.9 µWb
Pc Coefficient 1.09 High (Stable)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications and motors. Pc value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MW 4x6 / N38

Environment Effective steel pull Effect
Air (land) 0.41 kg Standard
Water (riverbed) 0.47 kg
(+0.06 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

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

2. Steel thickness impact

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

3. Thermal stability

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.09

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.

Engineering data and GPSR
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%
Ecology and recycling (GPSR)
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: 010078-2026
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The presented product is a very strong cylindrical magnet, made from advanced NdFeB material, which, at dimensions of Ø4x6 mm, guarantees optimal power. This specific item features an accuracy of ±0.1mm and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 0.41 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 4.06 N with a weight of only 0.57 g, this cylindrical magnet 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., 4.1 mm) using epoxy glues. To ensure stability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for 90% of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø4x6), 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 4 mm and height 6 mm. The value of 4.06 N means that the magnet is capable of holding a weight many times exceeding its own mass of 0.57 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 6 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 rare earth magnets.

Strengths

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
  • Magnets perfectly protect themselves against loss of magnetization caused by ambient magnetic noise,
  • In other words, due to the reflective surface of gold, the element becomes visually attractive,
  • Magnets have extremely high magnetic induction on the outer side,
  • 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...
  • Thanks to modularity in constructing and the capacity to customize to individual projects,
  • Versatile presence in electronics industry – they serve a role in magnetic memories, motor assemblies, medical devices, also other advanced devices.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Weaknesses

Drawbacks and weaknesses of neodymium magnets and proposals for their use:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its 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.
  • They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic holder, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products can complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Magnet power was defined for optimal configuration, taking into account:
  • on a block made of structural steel, optimally conducting the magnetic flux
  • whose transverse dimension is min. 10 mm
  • with a plane free of scratches
  • under conditions of gap-free contact (metal-to-metal)
  • under axial application of breakaway force (90-degree angle)
  • in stable room temperature

What influences lifting capacity in practice

During everyday use, the actual lifting capacity results from several key aspects, ranked from the most important:
  • Air gap (betwixt the magnet and the plate), because even a microscopic distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Plate material – mild steel gives the best results. Alloy steels lower magnetic permeability and holding force.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Temperature – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate decreases the holding force.

Precautions when working with NdFeB magnets
Pacemakers

Patients with a ICD should keep an safe separation from magnets. The magnetism can stop the operation of the life-saving device.

Avoid contact if allergic

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If an allergic reaction occurs, immediately stop working with magnets and wear gloves.

Conscious usage

Exercise caution. Neodymium magnets attract from a long distance and connect with huge force, often quicker than you can move away.

Dust is flammable

Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Power loss in heat

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.

Swallowing risk

Adult use only. Small elements can be swallowed, leading to intestinal necrosis. Store away from kids and pets.

Magnetic media

Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Fragile material

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Impact on smartphones

A powerful magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Maintain magnets near a smartphone to prevent damaging the sensors.

Crushing risk

Big blocks can crush fingers instantly. Never place your hand between two strong magnets.

Danger! Looking for details? Read our article: Are neodymium magnets dangerous?