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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

product specifications »

0.381 ZŁ with VAT / pcs + price for transport

0.310 ZŁ net + 23% VAT / pcs

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Technical details - 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

Physical analysis of the magnet - report

The following information are the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs gap) - 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 sharply with every mm of gap. Remember that even the smallest gap (e.g., contamination, varnish, rust) strongly weakens the grip. Neodymiums operate optimally at the point of direct contact; gap kills the power. See how quickly the pull force fall, when the product does not touch tightly to the steel surface. When planning the assembly, avoid redundant distances.

Table 2: Slippage load (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
The following data presents the approximate force needed to initiate the slippage of the magnet downwards on a upright steel plate (assuming typical friction). The holding force depends on the gap size between the magnet and the metal.

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 hanging a magnet on a upright surface (e.g., a fridge), it will only hold only approx. 1/5 of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that holders move down faster than they detach. Want to create a hanger? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the element will slide down under a much lighter cargo. Using a rubber layer can significantly improve the result.

Table 4: Material efficiency (saturation) - power losses
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 too thin steel cannot conduct the full magnetic flux, which squanders power of the magnet. Should you install a neodymium to a too thin substrate, the magnetism will penetrate right through and the pull force will drop sharply. To squeeze full efficiency of this neodymium's potential, you need a suitably thick element of metal. The saturation effect causes that on delicate walls (e.g., appliance housings), the holder holds weaker. We recommend selecting the steel dimension from these parameters.

Table 5: Working in heat (material behavior) - resistance threshold
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 lose parameters after exceeding the maximum temperature. Protect against heat – excessive heat can permanently demagnetize this magnet. With every degree above norm, the magnet's force momentarily drops. Avoid using this product in hot environments higher than its working range. Exceeding the critical threshold will result in destruction of magnetic properties.
*Important note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization at lower temperatures than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 4x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (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 significantly greater distance than a neodymium and metal combination. The setup of magnet-to-magnet creates a more powerful interaction and a wider radius of action. Designing a solid fastener? Use a pair of magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the pinch force is extreme. The levitation is marginally weaker than the connection force, but still large.
*Flux density between like poles reaches ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
* Calculations show friction force of a pair of identical magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Protective zones (implants) - 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
Mobile device 40 Gs (4.0 mT) 1.5 cm
Car key 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
Powerful magnet radiation poses a large risk to electronics and medical implants. These NdFeB products produce a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation penetrates the body and plastic. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - 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 very brittle – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Impact energy can cause material chips or painful pinches to fingers. Always hold the magnet during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear eye protection when working with large magnets.

Table 9: Surface protection spec
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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

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 passing through the pole surface. Essential parameter in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Physics of underwater searching
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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Shear force

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

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly 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) = 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
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%
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 offered product is an incredibly powerful rod magnet, composed of advanced NdFeB material, which, with dimensions of Ø4x6 mm, guarantees maximum efficiency. This specific item features high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 0.41 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 4.06 N with a weight of only 0.57 g, this cylindrical magnet is indispensable in electronics 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., 4.1 mm) using epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for the majority of applications in automation and machine building, where extreme 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 in continuous sale 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 secures it 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 4 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 diametrically if your project requires it.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Advantages

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • They have unchanged lifting capacity, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • Magnets perfectly resist against demagnetization caused by foreign field sources,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to present itself better,
  • The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to freedom in shaping and the ability to adapt to specific needs,
  • Universal use in innovative solutions – they are utilized in data components, electromotive mechanisms, advanced medical instruments, and modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of NdFeB magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • We suggest cover - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum magnetic pulling force – what it depends on?

The specified lifting capacity concerns the maximum value, measured under laboratory conditions, meaning:
  • using a sheet made of mild steel, acting as a circuit closing element
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • with direct contact (without coatings)
  • during pulling in a direction perpendicular to the plane
  • at room temperature

Lifting capacity in practice – influencing factors

It is worth knowing that the working load may be lower subject to the following factors, in order of importance:
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – mild steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Warnings
Dust is flammable

Dust produced during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

This is not a toy

Absolutely keep magnets away from children. Choking hazard is high, and the effects of magnets clamping inside the body are tragic.

Immense force

Handle with care. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can react.

Pinching danger

Big blocks can crush fingers in a fraction of a second. Never place your hand between two attracting surfaces.

Allergy Warning

Studies show that nickel (standard magnet coating) is a common allergen. If you have an allergy, prevent touching magnets with bare hands and opt for coated magnets.

Danger to pacemakers

Warning for patients: Powerful magnets affect electronics. Keep at least 30 cm distance or ask another person to handle the magnets.

Protect data

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

Maximum temperature

Standard neodymium magnets (grade N) lose power when the temperature surpasses 80°C. Damage is permanent.

Magnet fragility

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets will cause them cracking into shards.

Magnetic interference

A powerful magnetic field interferes with the operation of compasses in smartphones and navigation systems. Keep magnets near a device to avoid breaking the sensors.

Warning! More info about risks in the article: Safety of working with magnets.