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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

product specifications »

0.1476 ZŁ 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

Technical simulation of the product - report

These information represent the outcome of a engineering analysis. Values are based on models for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static force (pull vs distance) - characteristics
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 pounds
300.0 g / 2.9 N
 safe
1 mm 2106 Gs
210.6 mT
 0.05 kg / 0.12 pounds
54.8 g / 0.5 N
 safe
2 mm 845 Gs
84.5 mT
 0.01 kg / 0.02 pounds
8.8 g / 0.1 N
 safe
3 mm 393 Gs
39.3 mT
 0.00 kg / 0.00 pounds
1.9 g / 0.0 N
 safe
5 mm 124 Gs
12.4 mT
 0.00 kg / 0.00 pounds
0.2 g / 0.0 N
 safe
10 mm 21 Gs
2.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
15 mm 7 Gs
0.7 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
20 mm 3 Gs
0.3 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
30 mm 1 Gs
0.1 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
50 mm 0 Gs
0.0 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 safe
Magnetic force decreases sharply with every subsequent millimeter of spacing. Remember that even a very thin break (e.g., contamination, varnish, veneer) noticeably diminishes the holding power. Neodymiums hold most effectively in perfect adhesion; distance weakens the force. Notice how flashily the load capacity drop, when the product does not adhere directly to the steel surface. When designing the arrangement, discard redundant distances.

Table 2: Slippage load (wall)
MW 3x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.06 kg / 0.13 pounds
60.0 g / 0.6 N
1 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
2 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
3 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section shows the approximate weight limit necessary to start the downward movement of the magnet vertically against a upright steel plate (considering standard friction coefficient). This parameter depends on the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 pounds
90.0 g / 0.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.06 kg / 0.13 pounds
60.0 g / 0.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.03 kg / 0.07 pounds
30.0 g / 0.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.15 kg / 0.33 pounds
150.0 g / 1.5 N
When placing a magnet on a upright surface (e.g., a board), it you can count on only about 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip mean that magnets slip easier than they pop off the substrate. Want to create a hanger? Consider that the shear force is much weaker than the maximum static pull force. On a slippery surface, the magnet will slide down under a significantly smaller cargo. Utilizing a rubberized coating can effectively increase the grip.

Table 4: Material efficiency (saturation) - power losses
MW 3x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.03 kg / 0.07 pounds
30.0 g / 0.3 N
1 mm
25%
 0.08 kg / 0.17 pounds
75.0 g / 0.7 N
2 mm
50%
 0.15 kg / 0.33 pounds
150.0 g / 1.5 N
3 mm
75%
 0.22 kg / 0.50 pounds
225.0 g / 2.2 N
5 mm
100%
 0.30 kg / 0.66 pounds
300.0 g / 2.9 N
10 mm
100%
 0.30 kg / 0.66 pounds
300.0 g / 2.9 N
11 mm
100%
 0.30 kg / 0.66 pounds
300.0 g / 2.9 N
12 mm
100%
 0.30 kg / 0.66 pounds
300.0 g / 2.9 N
A thin sheet is unable to absorb the entire magnetic field, which squanders power of the holder. If you attach a powerful product to a too thin substrate, the field will penetrate right through and the holding will be smaller. To utilize full efficiency of this neodymium's potential, you need a suitably thick backing of steel. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel cross-section according to the table below.

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

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.30 kg / 0.66 pounds
300.0 g / 2.9 N
 OK
40 °C -2.2% 0.29 kg / 0.65 pounds
293.4 g / 2.9 N
 OK
60 °C -4.4% 0.29 kg / 0.63 pounds
286.8 g / 2.8 N
 OK
80 °C -6.6% 0.28 kg / 0.62 pounds
280.2 g / 2.7 N
100 °C -28.8% 0.21 kg / 0.47 pounds
213.6 g / 2.1 N
Standard neodymium magnets change their properties power past the thermal threshold. Watch out for overheating – excessive heat can permanently demagnetize this magnet. As the temperature rises, the magnet's power briefly lowers. Refrain from using this product in hot environments higher than its safe range. Ignoring the limit will cause destruction of magnetic properties.
*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures compared to rod magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field collision
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 pounds
5 766 Gs
0.16 kg / 0.35 pounds
159 g / 1.6 N
 N/A
1 mm 0.49 kg / 1.08 pounds
6 712 Gs
0.07 kg / 0.16 pounds
74 g / 0.7 N
 0.44 kg / 0.97 pounds
~0 Gs
2 mm 0.19 kg / 0.43 pounds
4 213 Gs
0.03 kg / 0.06 pounds
29 g / 0.3 N
 0.17 kg / 0.38 pounds
~0 Gs
3 mm 0.08 kg / 0.17 pounds
2 629 Gs
0.01 kg / 0.02 pounds
11 g / 0.1 N
 0.07 kg / 0.15 pounds
~0 Gs
5 mm 0.01 kg / 0.03 pounds
1 131 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.03 pounds
~0 Gs
10 mm 0.00 kg / 0.00 pounds
248 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
20 mm 0.00 kg / 0.00 pounds
41 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
50 mm 0.00 kg / 0.00 pounds
3 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.00 pounds
2 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
1 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
1 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
1 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
0 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products attract each other from a wider radius than a magnet and steel combination. Such a system of magnet-to-magnet creates a more powerful interaction and a larger range of action. Want to build a strong closure? Use a pair of magnets instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the pinch force is massive. The levitation is a bit weaker than the connection force, but still large.
*The magnetic induction between like poles reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).
Attention: Figures demonstrate shear force of a pair of matching neodymium magnets (friction ~0.15 for Ni-Ni plating).

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
Phone / Smartphone 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
A strong magnetic field is a serious hazard to electronic devices as well as medical implants. These magnets produce a flux that disrupts operation of digital equipment. Notice: the unseen radiation passes through tissues and housings. Special caution must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
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
Magnetic elements are delicate – a strong collision with metal risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Kinetic force can cause material chips or injury to skin. Hold the magnet firmly during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Anti-corrosion coating durability
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MW 3x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 353 Mx 3.5 µWb
Pc Coefficient 0.71 High (Stable)
Flux value emitted by the magnet pole. Essential parameter in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Shear force

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

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) severely weakens 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

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
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: 010064-2026
Magnet Unit Converter
Force (pull)
Magnetic Induction
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This product is an extremely powerful cylinder magnet, produced from durable NdFeB material, which, at dimensions of Ø3x2 mm, guarantees the highest energy density. The MW 3x2 / N38 model boasts high dimensional repeatability and professional build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 0.30 kg), this product is in stock from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 2.99 N with a weight of only 0.11 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 3.1 mm) using two-component epoxy glues. To ensure long-term durability 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 an optimal price-to-power ratio and high resistance to demagnetization. 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.
This model is characterized by dimensions Ø3x2 mm, which, at a weight of 0.11 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 0.30 kg (force ~2.99 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, 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 3 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 through the diameter if your project requires it.

Pros and cons of neodymium magnets.

Advantages

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They do not lose strength, even during around ten years – the decrease in lifting capacity is only ~1% (theoretically),
  • They retain their magnetic properties even under external field action,
  • Thanks to the shiny finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an professional appearance,
  • Neodymium magnets ensure maximum magnetic induction on a small area, which allows for strong attraction,
  • 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...
  • Possibility of custom creating as well as optimizing to individual applications,
  • Universal use in electronics industry – they are utilized in mass storage devices, drive modules, precision medical tools, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Problematic aspects of neodymium magnets and proposals for their use:
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of creating threads in the magnet and complex shapes - recommended is cover - mounting mechanism.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small components of these devices can 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 holding power of the magnet – what it depends on?

Holding force of 0.30 kg is a theoretical maximum value executed under specific, ideal conditions:
  • on a block made of structural steel, effectively closing the magnetic flux
  • with a thickness minimum 10 mm
  • with a plane perfectly flat
  • with direct contact (no impurities)
  • for force acting at a right angle (in the magnet axis)
  • in temp. approx. 20°C

What influences lifting capacity in practice

Effective lifting capacity impacted by specific conditions, including (from most important):
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material composition – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Surface structure – the more even the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity was measured using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas 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 decreases the lifting capacity.

Safe handling of neodymium magnets
Serious injuries

Watch your fingers. Two powerful magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!

Medical interference

People with a ICD must keep an large gap from magnets. The magnetic field can interfere with the functioning of the implant.

Flammability

Fire hazard: Rare earth powder is explosive. Avoid machining magnets without safety gear as this may cause fire.

Cards and drives

Data protection: Strong magnets can damage payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Permanent damage

Standard neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.

Nickel allergy

A percentage of the population experience a contact allergy to Ni, which is the typical protective layer for neodymium magnets. Frequent touching might lead to an allergic reaction. We strongly advise wear safety gloves.

Protective goggles

NdFeB magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets leads to them breaking into small pieces.

Respect the power

Use magnets with awareness. Their powerful strength can shock even professionals. Be vigilant and do not underestimate their power.

Threat to navigation

A powerful magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Keep magnets near a device to prevent damaging the sensors.

Choking Hazard

Strictly store magnets out of reach of children. Choking hazard is significant, and the consequences of magnets connecting inside the body are very dangerous.

Important! Want to know more? Check our post: Are neodymium magnets dangerous?