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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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Detailed specification - 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 - report

The following data constitute the outcome of a engineering calculation. Values are based on models for the material Nd2Fe14B. Real-world performance might slightly differ. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - 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
low risk
1 mm 3189 Gs
318.9 mT
0.12 kg / 0.27 LBS
121.7 g / 1.2 N
low risk
2 mm 1631 Gs
163.1 mT
0.03 kg / 0.07 LBS
31.8 g / 0.3 N
low risk
3 mm 894 Gs
89.4 mT
0.01 kg / 0.02 LBS
9.6 g / 0.1 N
low risk
5 mm 343 Gs
34.3 mT
0.00 kg / 0.00 LBS
1.4 g / 0.0 N
low risk
10 mm 73 Gs
7.3 mT
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
low risk
15 mm 26 Gs
2.6 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
20 mm 13 Gs
1.3 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
30 mm 4 Gs
0.4 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk
50 mm 1 Gs
0.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk

Table 2: Vertical hold (wall)
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: Vertical assembly (sliding) - behavior on slippery surfaces
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: Material efficiency (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 resistance (stability) - thermal limit
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) - field range
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: Safety (HSE) (implants) - precautionary measures
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: 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)

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)

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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet retains just ~20% of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Heat tolerance

*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

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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
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: 010078-2026
Measurement Calculator
Pulling force

Magnetic Induction

Other products

The offered product is a very strong cylinder magnet, composed of modern NdFeB material, which, with dimensions of Ø4x6 mm, guarantees maximum efficiency. The MW 4x6 / N38 model features a tolerance of ±0.1mm and industrial build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 0.41 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, 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.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio 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 store.
This model is characterized by dimensions Ø4x6 mm, which, at a weight of 0.57 g, makes it an element with impressive magnetic energy density. 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 oxidation, giving it an aesthetic, silvery shine.
This cylinder 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.

Advantages and disadvantages of rare earth magnets.

Pros

Besides their stability, neodymium magnets are valued for these benefits:
  • Their magnetic field remains stable, and after around 10 years it decreases only by ~1% (according to research),
  • They do not lose their magnetic properties even under external field action,
  • The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to look better,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to modularity in shaping and the capacity to customize to specific needs,
  • Versatile presence in future technologies – they find application in HDD drives, electromotive mechanisms, medical equipment, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in miniature devices

Cons

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce 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. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these devices can disrupt the diagnostic process 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

Highest magnetic holding forcewhat affects it?

The specified lifting capacity refers to the limit force, recorded under ideal test conditions, meaning:
  • using a sheet made of mild steel, serving as a circuit closing element
  • whose thickness is min. 10 mm
  • characterized by smoothness
  • under conditions of ideal adhesion (surface-to-surface)
  • under perpendicular application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Lifting capacity in practice – influencing factors

Please note that the application force may be lower subject to elements below, in order of importance:
  • Distance (between the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Steel type – mild steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
  • Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.

H&S for magnets
Heat sensitivity

Do not overheat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Pinching danger

Danger of trauma: The attraction force is so immense that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Dust explosion hazard

Mechanical processing of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Magnetic media

Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.

Respect the power

Handle magnets with awareness. Their immense force can surprise even experienced users. Stay alert and respect their force.

Keep away from electronics

Remember: neodymium magnets produce a field that confuses precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.

Swallowing risk

Absolutely store magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are very dangerous.

Material brittleness

Watch out for shards. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.

Pacemakers

Life threat: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Nickel coating and allergies

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Safety First! More info about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98