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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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Technical data - 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 analysis of the assembly - technical parameters

Presented information represent the outcome of a engineering analysis. Values rely on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - 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 LBS
300.0 g / 2.9 N
weak grip
1 mm 2106 Gs
210.6 mT
0.05 kg / 0.12 LBS
54.8 g / 0.5 N
weak grip
2 mm 845 Gs
84.5 mT
0.01 kg / 0.02 LBS
8.8 g / 0.1 N
weak grip
3 mm 393 Gs
39.3 mT
0.00 kg / 0.00 LBS
1.9 g / 0.0 N
weak grip
5 mm 124 Gs
12.4 mT
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
weak grip
10 mm 21 Gs
2.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
15 mm 7 Gs
0.7 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
20 mm 3 Gs
0.3 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
30 mm 1 Gs
0.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
50 mm 0 Gs
0.0 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip

Table 2: Vertical 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 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 (shearing) - 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: Two magnets (repulsion) - field range
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) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 1.5 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 (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

Table 9: Coating parameters (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)

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)

Table 11: Underwater work (magnet fishing)
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Caution: On a vertical surface, the magnet holds just ~20% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) severely reduces 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.

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%
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
Pulling force

Field Strength

View also products

The presented product is an exceptionally strong rod magnet, manufactured from modern NdFeB material, which, with dimensions of Ø3x2 mm, guarantees the highest energy density. The MW 3x2 / N38 model is characterized by an accuracy of ±0.1mm and professional build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 0.30 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard 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 2.99 N with a weight of only 0.11 g, this rod is indispensable in electronics and wherever low weight is crucial.
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 epoxy glues. To ensure long-term durability in industry, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance 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 store.
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 defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This rod magnet 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 diametrically if your project requires it.

Pros as well as cons of neodymium magnets.

Strengths

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • They have constant strength, and over around ten years their performance decreases symbolically – ~1% (according to theory),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • In other words, due to the reflective surface of gold, the element looks attractive,
  • Magnets have maximum magnetic induction on the surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of accurate shaping and optimizing to specific applications,
  • Wide application in modern technologies – they find application in computer drives, motor assemblies, diagnostic systems, also complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in compact constructions

Cons

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very 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, when using outdoors
  • We recommend casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. It is also worth noting that small components of these products are able to complicate diagnosis medical after entering 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 contributes to it?

Information about lifting capacity is the result of a measurement for the most favorable conditions, taking into account:
  • using a base made of low-carbon steel, functioning as a ideal flux conductor
  • with a thickness no less than 10 mm
  • characterized by smoothness
  • with direct contact (without paint)
  • for force acting at a right angle (in the magnet axis)
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Holding efficiency is influenced by specific conditions, including (from priority):
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Stainless steels may attract less.
  • Surface condition – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet and the plate decreases the holding force.

Warnings
Sensitization to coating

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

Handling rules

Handle magnets with awareness. Their immense force can surprise even experienced users. Plan your moves and respect their power.

Fragile material

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Threat to navigation

GPS units and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

No play value

Product intended for adults. Small elements can be swallowed, causing intestinal necrosis. Keep out of reach of children and animals.

Data carriers

Powerful magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Stay away of at least 10 cm.

Dust explosion hazard

Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Permanent damage

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

Hand protection

Large magnets can smash fingers instantly. Never place your hand betwixt two strong magnets.

Implant safety

Patients with a heart stimulator must keep an safe separation from magnets. The magnetic field can disrupt the operation of the implant.

Safety First! 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