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MW 2x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010055

GTIN/EAN: 5906301810544

5.00

Diameter Ø

2 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

0.09 g

Magnetization Direction

↑ axial

Load capacity

0.09 kg / 0.86 N

Magnetic Induction

597.70 mT / 5977 Gs

Coating

[NiCuNi] Nickel

0.209 with VAT / pcs + price for transport

0.1700 ZŁ net + 23% VAT / pcs

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Technical parameters - MW 2x4 / N38 - cylindrical magnet

Specification / characteristics - MW 2x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010055
GTIN/EAN 5906301810544
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 2 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 0.09 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.09 kg / 0.86 N
Magnetic Induction ~ ? 597.70 mT / 5977 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 2x4 / 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 analysis of the product - report

The following data constitute the outcome of a mathematical simulation. Results are based on algorithms for the material Nd2Fe14B. Real-world conditions might slightly differ. Use these calculations as a reference point during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
MW 2x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5954 Gs
595.4 mT
0.09 kg / 0.20 lbs
90.0 g / 0.9 N
low risk
1 mm 1696 Gs
169.6 mT
0.01 kg / 0.02 lbs
7.3 g / 0.1 N
low risk
2 mm 570 Gs
57.0 mT
0.00 kg / 0.00 lbs
0.8 g / 0.0 N
low risk
3 mm 256 Gs
25.6 mT
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
low risk
5 mm 82 Gs
8.2 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk
10 mm 15 Gs
1.5 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk
15 mm 5 Gs
0.5 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk
20 mm 2 Gs
0.2 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk
30 mm 1 Gs
0.1 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk
50 mm 0 Gs
0.0 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
low risk

Table 2: Vertical capacity (vertical surface)
MW 2x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.02 kg / 0.04 lbs
18.0 g / 0.2 N
1 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
2 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
3 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 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 (shearing) - vertical pull
MW 2x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.03 kg / 0.06 lbs
27.0 g / 0.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.02 kg / 0.04 lbs
18.0 g / 0.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.01 kg / 0.02 lbs
9.0 g / 0.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.05 kg / 0.10 lbs
45.0 g / 0.4 N

Table 4: Steel thickness (saturation) - sheet metal selection
MW 2x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.01 kg / 0.02 lbs
9.0 g / 0.1 N
1 mm
25%
0.02 kg / 0.05 lbs
22.5 g / 0.2 N
2 mm
50%
0.05 kg / 0.10 lbs
45.0 g / 0.4 N
3 mm
75%
0.07 kg / 0.15 lbs
67.5 g / 0.7 N
5 mm
100%
0.09 kg / 0.20 lbs
90.0 g / 0.9 N
10 mm
100%
0.09 kg / 0.20 lbs
90.0 g / 0.9 N
11 mm
100%
0.09 kg / 0.20 lbs
90.0 g / 0.9 N
12 mm
100%
0.09 kg / 0.20 lbs
90.0 g / 0.9 N

Table 5: Thermal resistance (stability) - thermal limit
MW 2x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.09 kg / 0.20 lbs
90.0 g / 0.9 N
OK
40 °C -2.2% 0.09 kg / 0.19 lbs
88.0 g / 0.9 N
OK
60 °C -4.4% 0.09 kg / 0.19 lbs
86.0 g / 0.8 N
OK
80 °C -6.6% 0.08 kg / 0.19 lbs
84.1 g / 0.8 N
100 °C -28.8% 0.06 kg / 0.14 lbs
64.1 g / 0.6 N

Table 6: Two magnets (repulsion) - forces in the system
MW 2x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 0.69 kg / 1.51 lbs
6 090 Gs
0.10 kg / 0.23 lbs
103 g / 1.0 N
N/A
1 mm 0.21 kg / 0.46 lbs
6 559 Gs
0.03 kg / 0.07 lbs
31 g / 0.3 N
0.19 kg / 0.41 lbs
~0 Gs
2 mm 0.06 kg / 0.12 lbs
3 391 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
0.05 kg / 0.11 lbs
~0 Gs
3 mm 0.02 kg / 0.04 lbs
1 883 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.03 lbs
~0 Gs
5 mm 0.00 kg / 0.01 lbs
743 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
10 mm 0.00 kg / 0.00 lbs
165 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
20 mm 0.00 kg / 0.00 lbs
30 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
3 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
2 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
1 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
1 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
0 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
0 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 2x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 2.0 cm
Hearing aid 10 Gs (1.0 mT) 1.5 cm
Mechanical watch 20 Gs (2.0 mT) 1.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 1.0 cm
Car key 50 Gs (5.0 mT) 1.0 cm
Payment card 400 Gs (40.0 mT) 0.5 cm
HDD hard drive 600 Gs (60.0 mT) 0.5 cm

Table 8: Collisions (cracking risk) - collision effects
MW 2x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 31.89 km/h
(8.86 m/s)
0.00 J
30 mm 55.24 km/h
(15.34 m/s)
0.01 J
50 mm 71.31 km/h
(19.81 m/s)
0.02 J
100 mm 100.85 km/h
(28.01 m/s)
0.04 J

Table 9: Corrosion resistance
MW 2x4 / 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 (Flux)
MW 2x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 209 Mx 2.1 µWb
Pc Coefficient 1.21 High (Stable)

Table 11: Hydrostatics and buoyancy
MW 2x4 / N38

Environment Effective steel pull Effect
Air (land) 0.09 kg Standard
Water (riverbed) 0.10 kg
(+0.01 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. Shear force

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

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically limits the holding force.

3. Heat tolerance

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.21

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.

Technical and environmental data
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: 010055-2026
Measurement Calculator
Magnet pull force

Magnetic Induction

Other proposals

The presented product is an extremely powerful cylinder magnet, produced from advanced NdFeB material, which, at dimensions of Ø2x4 mm, guarantees the highest energy density. The MW 2x4 / N38 component boasts an accuracy of ±0.1mm and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 0.09 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Additionally, 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 modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the high power of 0.86 N with a weight of only 0.09 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in automation, anaerobic resins 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 high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø2x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 2 mm and height 4 mm. The key parameter here is the holding force amounting to approximately 0.09 kg (force ~0.86 N), which, with such defined dimensions, proves the high power of the NdFeB material. 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 4 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 through the diameter if your project requires it.

Advantages as well as disadvantages of rare earth magnets.

Pros

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • Their power is durable, and after around ten years it drops only by ~1% (theoretically),
  • Magnets effectively defend themselves against demagnetization caused by foreign field sources,
  • A magnet with a shiny silver surface has better aesthetics,
  • Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Thanks to versatility in constructing and the capacity to adapt to specific needs,
  • Fundamental importance in innovative solutions – they serve a role in hard drives, electric drive systems, medical devices, also technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Cons of neodymium magnets and ways of using them
  • Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their strength 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 while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We suggest casing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex forms.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can complicate diagnosis medical when they are in the body.
  • With mass production the cost of neodymium magnets is a challenge,

Pull force analysis

Optimal lifting capacity of a neodymium magnetwhat affects it?

The lifting capacity listed is a result of laboratory testing performed under the following configuration:
  • using a sheet made of low-carbon steel, functioning as a ideal flux conductor
  • with a cross-section of at least 10 mm
  • with an ideally smooth touching surface
  • with total lack of distance (no impurities)
  • during pulling in a direction perpendicular to the plane
  • at conditions approx. 20°C

Lifting capacity in practice – influencing factors

It is worth knowing that the application force will differ influenced by elements below, starting with the most relevant:
  • Distance – the presence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Steel grade – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
  • Surface condition – smooth surfaces ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity was determined with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Hand protection

Risk of injury: The attraction force is so great that it can result in blood blisters, crushing, and broken bones. Use thick gloves.

Warning for heart patients

Patients with a pacemaker have to maintain an safe separation from magnets. The magnetism can interfere with the operation of the life-saving device.

Magnet fragility

Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.

Do not give to children

Always store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are tragic.

Protect data

Device Safety: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).

Threat to navigation

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Immense force

Before starting, check safety instructions. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Sensitization to coating

A percentage of the population suffer from a hypersensitivity to nickel, which is the standard coating for neodymium magnets. Frequent touching might lead to an allergic reaction. We recommend wear protective gloves.

Maximum temperature

Control the heat. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Dust is flammable

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

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

e-mail: bok@dhit.pl

tel: +48 888 99 98 98