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MW 3x2 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010064

GTIN/EAN: 5906301810636

5.00

Diameter Ø

3 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

0.11 g

Magnetization Direction

↑ axial

Load capacity

0.30 kg / 2.99 N

Magnetic Induction

493.99 mT / 4940 Gs

Coating

[NiCuNi] Nickel

0.1476 with VAT / pcs + price for transport

0.1200 ZŁ net + 23% VAT / pcs

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Product card - MW 3x2 / N38 - cylindrical magnet

Specification / characteristics - MW 3x2 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010064
GTIN/EAN 5906301810636
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 3 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 0.11 g
Magnetization Direction ↑ axial
Load capacity ~ ? 0.30 kg / 2.99 N
Magnetic Induction ~ ? 493.99 mT / 4940 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 3x2 / 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 - technical parameters

These values represent the result of a engineering calculation. Values are based on models for the material Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - power drop
MW 3x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4928 Gs
492.8 mT
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
safe
1 mm 2106 Gs
210.6 mT
0.05 kg / 0.12 LBS
54.8 g / 0.5 N
safe
2 mm 845 Gs
84.5 mT
0.01 kg / 0.02 LBS
8.8 g / 0.1 N
safe
3 mm 393 Gs
39.3 mT
0.00 kg / 0.00 LBS
1.9 g / 0.0 N
safe
5 mm 124 Gs
12.4 mT
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
safe
10 mm 21 Gs
2.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
15 mm 7 Gs
0.7 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
20 mm 3 Gs
0.3 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
30 mm 1 Gs
0.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
50 mm 0 Gs
0.0 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

Table 2: Vertical load (vertical surface)
MW 3x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.06 kg / 0.13 LBS
60.0 g / 0.6 N
1 mm Stal (~0.2) 0.01 kg / 0.02 LBS
10.0 g / 0.1 N
2 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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 (sliding) - vertical pull
MW 3x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.06 kg / 0.13 LBS
60.0 g / 0.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.03 kg / 0.07 LBS
30.0 g / 0.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.15 kg / 0.33 LBS
150.0 g / 1.5 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 3x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.03 kg / 0.07 LBS
30.0 g / 0.3 N
1 mm
25%
0.08 kg / 0.17 LBS
75.0 g / 0.7 N
2 mm
50%
0.15 kg / 0.33 LBS
150.0 g / 1.5 N
3 mm
75%
0.22 kg / 0.50 LBS
225.0 g / 2.2 N
5 mm
100%
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
10 mm
100%
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
11 mm
100%
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
12 mm
100%
0.30 kg / 0.66 LBS
300.0 g / 2.9 N

Table 5: Thermal resistance (stability) - power drop
MW 3x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.30 kg / 0.66 LBS
300.0 g / 2.9 N
OK
40 °C -2.2% 0.29 kg / 0.65 LBS
293.4 g / 2.9 N
OK
60 °C -4.4% 0.29 kg / 0.63 LBS
286.8 g / 2.8 N
OK
80 °C -6.6% 0.28 kg / 0.62 LBS
280.2 g / 2.7 N
100 °C -28.8% 0.21 kg / 0.47 LBS
213.6 g / 2.1 N

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 3x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.06 kg / 2.33 LBS
5 766 Gs
0.16 kg / 0.35 LBS
159 g / 1.6 N
N/A
1 mm 0.49 kg / 1.08 LBS
6 712 Gs
0.07 kg / 0.16 LBS
74 g / 0.7 N
0.44 kg / 0.97 LBS
~0 Gs
2 mm 0.19 kg / 0.43 LBS
4 213 Gs
0.03 kg / 0.06 LBS
29 g / 0.3 N
0.17 kg / 0.38 LBS
~0 Gs
3 mm 0.08 kg / 0.17 LBS
2 629 Gs
0.01 kg / 0.02 LBS
11 g / 0.1 N
0.07 kg / 0.15 LBS
~0 Gs
5 mm 0.01 kg / 0.03 LBS
1 131 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
0.01 kg / 0.03 LBS
~0 Gs
10 mm 0.00 kg / 0.00 LBS
248 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
41 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
1 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 (electronics) - warnings
MW 3x2 / 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) 1.5 cm
Mobile device 40 Gs (4.0 mT) 1.0 cm
Remote 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: Dynamics (kinetic energy) - collision effects
MW 3x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 52.67 km/h
(14.63 m/s)
0.01 J
30 mm 91.22 km/h
(25.34 m/s)
0.04 J
50 mm 117.77 km/h
(32.71 m/s)
0.06 J
100 mm 166.55 km/h
(46.26 m/s)
0.12 J

Table 9: Corrosion resistance
MW 3x2 / 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 (Pc)
MW 3x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 353 Mx 3.5 µWb
Pc Coefficient 0.71 High (Stable)

Table 11: Physics of underwater searching
MW 3x2 / N38

Environment Effective steel pull Effect
Air (land) 0.30 kg Standard
Water (riverbed) 0.34 kg
(+0.04 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

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

2. Steel saturation

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

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.71

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%
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: 010064-2026
Magnet Unit Converter
Force (pull)

Magnetic Induction

Other offers

The presented product is an incredibly powerful cylinder magnet, manufactured from modern NdFeB material, which, at dimensions of Ø3x2 mm, guarantees maximum efficiency. The MW 3x2 / N38 model boasts an accuracy of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 0.30 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 standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced robotics, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 2.99 N with a weight of only 0.11 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, 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, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. If you need even stronger magnets in the same volume (Ø3x2), 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 3 mm and height 2 mm. The key parameter here is the holding force amounting to approximately 0.30 kg (force ~2.99 N), which, with such compact 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 2 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 and disadvantages of neodymium magnets.

Advantages

Besides their stability, neodymium magnets are valued for these benefits:
  • Their magnetic field is maintained, and after approximately ten years it drops only by ~1% (theoretically),
  • They retain their magnetic properties even under external field action,
  • In other words, due to the reflective layer of silver, the element becomes visually attractive,
  • Neodymium magnets deliver maximum magnetic induction on a small area, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures approaching 230°C and above...
  • Possibility of accurate machining and optimizing to individual requirements,
  • Huge importance in electronics industry – they find application in data components, electromotive mechanisms, medical devices, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in compact constructions

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited possibility of creating threads in the magnet and complex shapes - preferred is a housing - mounting mechanism.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that small elements of these products can complicate diagnosis medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

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

The declared magnet strength represents the limit force, obtained under optimal environment, meaning:
  • using a plate made of low-carbon steel, functioning as a ideal flux conductor
  • whose transverse dimension equals approx. 10 mm
  • with an ideally smooth contact surface
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction vertical to the plane
  • in temp. approx. 20°C

Practical lifting capacity: influencing factors

Effective lifting capacity is affected by working environment parameters, including (from priority):
  • Clearance – existence of any layer (rust, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Material composition – different alloys attracts identically. High carbon content weaken the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
  • Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate decreases the load capacity.

H&S for magnets
Allergy Warning

Nickel alert: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, immediately stop working with magnets and wear gloves.

Medical interference

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Protective goggles

Watch out for shards. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Keep away from computers

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

Immense force

Before use, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Compass and GPS

Navigation devices and mobile phones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Crushing force

Danger of trauma: The pulling power is so great that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Danger to the youngest

Product intended for adults. Tiny parts pose a choking risk, causing serious injuries. Keep away from children and animals.

Thermal limits

Control the heat. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.

Mechanical processing

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Warning! Details about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98