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MW 12x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010018

GTIN/EAN: 5906301810179

5.00

Diameter Ø

12 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

2.54 g

Magnetization Direction

↑ axial

Load capacity

2.49 kg / 24.43 N

Magnetic Induction

277.09 mT / 2771 Gs

Coating

[NiCuNi] Nickel

1.648 with VAT / pcs + price for transport

1.340 ZŁ net + 23% VAT / pcs

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Product card - MW 12x3 / N38 - cylindrical magnet

Specification / characteristics - MW 12x3 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010018
GTIN/EAN 5906301810179
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 12 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 2.54 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.49 kg / 24.43 N
Magnetic Induction ~ ? 277.09 mT / 2771 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12x3 / 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

Physical modeling of the product - data

The following values are the outcome of a physical analysis. Values are based on models for the material Nd2Fe14B. Actual performance might slightly differ from theoretical values. Use these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MW 12x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2770 Gs
277.0 mT
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
warning
1 mm 2420 Gs
242.0 mT
1.90 kg / 4.19 LBS
1900.6 g / 18.6 N
weak grip
2 mm 2009 Gs
200.9 mT
1.31 kg / 2.89 LBS
1309.4 g / 12.8 N
weak grip
3 mm 1611 Gs
161.1 mT
0.84 kg / 1.86 LBS
842.7 g / 8.3 N
weak grip
5 mm 991 Gs
99.1 mT
0.32 kg / 0.70 LBS
318.7 g / 3.1 N
weak grip
10 mm 313 Gs
31.3 mT
0.03 kg / 0.07 LBS
31.8 g / 0.3 N
weak grip
15 mm 125 Gs
12.5 mT
0.01 kg / 0.01 LBS
5.1 g / 0.0 N
weak grip
20 mm 61 Gs
6.1 mT
0.00 kg / 0.00 LBS
1.2 g / 0.0 N
weak grip
30 mm 20 Gs
2.0 mT
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
weak grip
50 mm 5 Gs
0.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip

Table 2: Sliding hold (wall)
MW 12x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.50 kg / 1.10 LBS
498.0 g / 4.9 N
1 mm Stal (~0.2) 0.38 kg / 0.84 LBS
380.0 g / 3.7 N
2 mm Stal (~0.2) 0.26 kg / 0.58 LBS
262.0 g / 2.6 N
3 mm Stal (~0.2) 0.17 kg / 0.37 LBS
168.0 g / 1.6 N
5 mm Stal (~0.2) 0.06 kg / 0.14 LBS
64.0 g / 0.6 N
10 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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) - behavior on slippery surfaces
MW 12x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.75 kg / 1.65 LBS
747.0 g / 7.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.50 kg / 1.10 LBS
498.0 g / 4.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.25 kg / 0.55 LBS
249.0 g / 2.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.25 kg / 2.74 LBS
1245.0 g / 12.2 N

Table 4: Steel thickness (saturation) - power losses
MW 12x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.25 kg / 0.55 LBS
249.0 g / 2.4 N
1 mm
25%
0.62 kg / 1.37 LBS
622.5 g / 6.1 N
2 mm
50%
1.25 kg / 2.74 LBS
1245.0 g / 12.2 N
3 mm
75%
1.87 kg / 4.12 LBS
1867.5 g / 18.3 N
5 mm
100%
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
10 mm
100%
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
11 mm
100%
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
12 mm
100%
2.49 kg / 5.49 LBS
2490.0 g / 24.4 N

Table 5: Thermal resistance (stability) - resistance threshold
MW 12x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.49 kg / 5.49 LBS
2490.0 g / 24.4 N
OK
40 °C -2.2% 2.44 kg / 5.37 LBS
2435.2 g / 23.9 N
OK
60 °C -4.4% 2.38 kg / 5.25 LBS
2380.4 g / 23.4 N
80 °C -6.6% 2.33 kg / 5.13 LBS
2325.7 g / 22.8 N
100 °C -28.8% 1.77 kg / 3.91 LBS
1772.9 g / 17.4 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 12x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.35 kg / 11.79 LBS
4 377 Gs
0.80 kg / 1.77 LBS
802 g / 7.9 N
N/A
1 mm 4.75 kg / 10.46 LBS
5 218 Gs
0.71 kg / 1.57 LBS
712 g / 7.0 N
4.27 kg / 9.42 LBS
~0 Gs
2 mm 4.08 kg / 9.00 LBS
4 840 Gs
0.61 kg / 1.35 LBS
612 g / 6.0 N
3.67 kg / 8.10 LBS
~0 Gs
3 mm 3.42 kg / 7.55 LBS
4 433 Gs
0.51 kg / 1.13 LBS
514 g / 5.0 N
3.08 kg / 6.80 LBS
~0 Gs
5 mm 2.27 kg / 5.01 LBS
3 610 Gs
0.34 kg / 0.75 LBS
341 g / 3.3 N
2.04 kg / 4.51 LBS
~0 Gs
10 mm 0.68 kg / 1.51 LBS
1 982 Gs
0.10 kg / 0.23 LBS
103 g / 1.0 N
0.62 kg / 1.36 LBS
~0 Gs
20 mm 0.07 kg / 0.15 LBS
626 Gs
0.01 kg / 0.02 LBS
10 g / 0.1 N
0.06 kg / 0.14 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
67 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
41 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
27 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
18 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
13 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
10 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 12x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 5.0 cm
Hearing aid 10 Gs (1.0 mT) 4.0 cm
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 2.5 cm
Remote 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (kinetic energy) - collision effects
MW 12x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 31.83 km/h
(8.84 m/s)
0.10 J
30 mm 54.69 km/h
(15.19 m/s)
0.29 J
50 mm 70.61 km/h
(19.61 m/s)
0.49 J
100 mm 99.85 km/h
(27.74 m/s)
0.98 J

Table 9: Surface protection spec
MW 12x3 / 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 12x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 3 483 Mx 34.8 µWb
Pc Coefficient 0.35 Low (Flat)

Table 11: Physics of underwater searching
MW 12x3 / N38

Environment Effective steel pull Effect
Air (land) 2.49 kg Standard
Water (riverbed) 2.85 kg
(+0.36 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. Wall mount (shear)

*Note: On a vertical wall, the magnet holds merely ~20% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) severely 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) = 0.35

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.

Technical specification and ecology
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%
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: 010018-2026
Measurement Calculator
Pulling force

Field Strength

Other products

The offered product is a very strong cylinder magnet, composed of durable NdFeB material, which, with dimensions of Ø12x3 mm, guarantees the highest energy density. This specific item is characterized by an accuracy of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 2.49 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 24.43 N with a weight of only 2.54 g, this rod is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 12.1 mm) using epoxy glues. To ensure long-term durability 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 popular standard for industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need even stronger magnets in the same volume (Ø12x3), 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 Ø12x3 mm, which, at a weight of 2.54 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 2.49 kg (force ~24.43 N), which, with such compact dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against oxidation, 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 12 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 diametrically if your project requires it.

Advantages and disadvantages of Nd2Fe14B magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They have excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • By covering with a lustrous coating of silver, the element acquires an proper look,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of accurate modeling and adjusting to concrete conditions,
  • Key role in advanced technology sectors – they are utilized in HDD drives, drive modules, precision medical tools, as well as other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Limitations

Cons of neodymium magnets and proposals for their use:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend a housing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated forms.
  • Possible danger to health – tiny shards of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical after entering the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Maximum magnetic pulling forcewhat contributes to it?

The specified lifting capacity represents the peak performance, measured under laboratory conditions, specifically:
  • with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • with a cross-section of at least 10 mm
  • characterized by smoothness
  • without the slightest air gap between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

What influences lifting capacity in practice

In real-world applications, the actual holding force results from a number of factors, ranked from the most important:
  • Air gap (between the magnet and the plate), since even a very small clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Angle of force application – maximum parameter is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin plate causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal weaken the grip.
  • Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the holding force.

Precautions when working with neodymium magnets
Maximum temperature

Avoid heat. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Dust explosion hazard

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

Physical harm

Risk of injury: The attraction force is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Data carriers

Do not bring magnets near a purse, laptop, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.

Respect the power

Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Fragile material

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

Phone sensors

Note: rare earth magnets produce a field that interferes with precision electronics. Maintain a separation from your mobile, device, and navigation systems.

Danger to the youngest

Adult use only. Small elements can be swallowed, causing intestinal necrosis. Store away from kids and pets.

Allergic reactions

A percentage of the population have a contact allergy to nickel, which is the common plating for NdFeB magnets. Prolonged contact can result in dermatitis. We strongly advise wear safety gloves.

Warning for heart patients

Warning for patients: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Caution! More info about hazards in the article: Magnet Safety Guide.