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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

0.381 with VAT / pcs + price for transport

0.310 ZŁ net + 23% VAT / pcs

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Contact us by phone +48 22 499 98 98 alternatively send us a note through inquiry form the contact page.
Force as well as form of magnets can be calculated on our magnetic mass calculator.

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Technical of the product - 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

Engineering simulation of the assembly - report

Presented data are the result of a physical calculation. Results were calculated on algorithms for the material Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Please consider these data as a reference point when designing systems.

Table 1: Static pull force (force vs distance) - characteristics
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

Table 2: Shear 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

Table 3: Wall mounting (shearing) - 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

Table 4: Steel thickness (substrate influence) - 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

Table 5: Thermal stability (material behavior) - 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

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

Table 7: Hazards (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
Timepiece 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

Table 8: Impact energy (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

Table 9: Corrosion resistance
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)

Table 10: Electrical data (Flux)
MW 4x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 792 Mx 7.9 µWb
Pc Coefficient 1.09 High (Stable)

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.
1. Vertical hold

*Note: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Thermal stability

*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) = 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%
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: 010078-2026
Measurement Calculator
Magnet pull force

Field Strength

Other products

The offered product is an exceptionally strong cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø4x6 mm, guarantees maximum efficiency. This specific item features high dimensional repeatability and professional build quality, making it an ideal solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 0.41 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 effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force 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 two-component epoxy glues. To ensure long-term durability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering a great economic balance and operational stability. 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 warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 4 mm and height 6 mm. The key parameter here is the lifting capacity amounting to approximately 0.41 kg (force ~4.06 N), which, with such compact dimensions, proves the high grade 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 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 rare earth magnets.

Benefits

Apart from their notable power, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
  • Neodymium magnets are distinguished by highly resistant to demagnetization caused by external magnetic fields,
  • A magnet with a shiny gold surface has an effective appearance,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Due to the possibility of accurate molding and customization to specialized needs, magnetic components can be produced in a wide range of forms and dimensions, which increases their versatility,
  • Fundamental importance in high-tech industry – they find application in data components, electromotive mechanisms, medical equipment, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in miniature devices

Disadvantages

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Limited ability of producing threads in the magnet and complicated forms - preferred is casing - mounting mechanism.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Additionally, small elements of these devices are able to disrupt the diagnostic process medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Holding force characteristics

Detachment force of the magnet in optimal conditionswhat it depends on?

Breakaway force was defined for ideal contact conditions, including:
  • with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • with a cross-section no less than 10 mm
  • with an polished touching surface
  • with zero gap (without coatings)
  • during pulling in a direction vertical to the plane
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Real force is affected by specific conditions, including (from priority):
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Steel grade – ideal substrate is high-permeability steel. Stainless steels may attract less.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Temperature – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was measured with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets
Material brittleness

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets will cause them shattering into shards.

Phone sensors

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the internal compass in your phone.

Allergic reactions

Certain individuals experience a contact allergy to nickel, which is the standard coating for NdFeB magnets. Extended handling may cause a rash. It is best to use protective gloves.

Pinching danger

Pinching hazard: The attraction force is so great that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.

Pacemakers

Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

Handling rules

Before use, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Machining danger

Powder generated during machining of magnets is flammable. Do not drill into magnets unless you are an expert.

Threat to electronics

Very strong magnetic fields can destroy records on credit cards, hard drives, and storage devices. Stay away of min. 10 cm.

Power loss in heat

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will ruin its properties and strength.

This is not a toy

These products are not intended for children. Swallowing several magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and necessitates urgent medical intervention.

Warning! Learn more about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98