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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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Technical details - 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

Engineering modeling of the assembly - report

These data represent the direct effect of a engineering analysis. Values were calculated on algorithms for the material Nd2Fe14B. Real-world performance may differ. Please consider these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
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
low risk
2 mm 2009 Gs
200.9 mT
1.31 kg / 2.89 LBS
1309.4 g / 12.8 N
low risk
3 mm 1611 Gs
161.1 mT
0.84 kg / 1.86 LBS
842.7 g / 8.3 N
low risk
5 mm 991 Gs
99.1 mT
0.32 kg / 0.70 LBS
318.7 g / 3.1 N
low risk
10 mm 313 Gs
31.3 mT
0.03 kg / 0.07 LBS
31.8 g / 0.3 N
low risk
15 mm 125 Gs
12.5 mT
0.01 kg / 0.01 LBS
5.1 g / 0.0 N
low risk
20 mm 61 Gs
6.1 mT
0.00 kg / 0.00 LBS
1.2 g / 0.0 N
low risk
30 mm 20 Gs
2.0 mT
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
low risk
50 mm 5 Gs
0.5 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk

Table 2: Vertical capacity (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: Wall mounting (shearing) - vertical pull
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: Material efficiency (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: Working in heat (material behavior) - thermal limit
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) Lateral 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: Safety (HSE) (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
Timepiece 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: Dynamics (kinetic energy) - warning
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: Anti-corrosion coating durability
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: Electrical 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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains only a fraction of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Power loss vs temp

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.35

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 specification and ecology
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: 010018-2026
Magnet Unit Converter
Pulling force

Magnetic Field

Other proposals

The presented product is an exceptionally strong cylindrical magnet, made from durable NdFeB material, which, with dimensions of Ø12x3 mm, guarantees the highest energy density. This specific item features high dimensional repeatability and industrial build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 2.49 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced robotics, and broadly understood industry, serving as a positioning 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 tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 12.1 mm) using two-component epoxy glues. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest 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 warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 12 mm and height 3 mm. The value of 24.43 N means that the magnet is capable of holding a weight many times exceeding its own mass of 2.54 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 3 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.

Strengths and weaknesses of Nd2Fe14B magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • Their strength remains stable, and after approximately ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under strong external field,
  • A magnet with a metallic silver surface has an effective appearance,
  • They are known for high magnetic induction at the operating surface, which affects their effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Thanks to versatility in forming and the ability to modify to complex applications,
  • Wide application in advanced technology sectors – they are commonly used in hard drives, electric motors, medical equipment, and industrial machines.
  • Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages

Cons of neodymium magnets: application proposals
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their power 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 corrode. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in creating nuts and complex forms in magnets, we propose using casing - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Best holding force of the magnet in ideal parameterswhat affects it?

Information about lifting capacity was determined for optimal configuration, taking into account:
  • with the use of a sheet made of special test steel, ensuring full magnetic saturation
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with an ground touching surface
  • with total lack of distance (without impurities)
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Determinants of practical lifting force of a magnet

Effective lifting capacity is influenced by specific conditions, such as (from most important):
  • Gap (between the magnet and the metal), because even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, corrosion or debris).
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Plate material – low-carbon steel attracts best. Alloy steels decrease magnetic properties and lifting capacity.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
  • Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was determined by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate reduces the holding force.

Warnings
GPS Danger

Note: rare earth magnets produce a field that interferes with sensitive sensors. Keep a safe distance from your phone, device, and navigation systems.

Flammability

Powder produced during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Warning for heart patients

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

Heat sensitivity

Watch the temperature. Exposing the magnet to high heat will permanently weaken its properties and strength.

Magnetic media

Data protection: Strong magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, mechanical watches).

Material brittleness

Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Choking Hazard

Only for adults. Small elements pose a choking risk, leading to severe trauma. Store away from children and animals.

Crushing risk

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

Nickel coating and allergies

Certain individuals suffer from a sensitization to Ni, which is the standard coating for neodymium magnets. Frequent touching might lead to a rash. We strongly advise use protective gloves.

Immense force

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Security! Looking for details? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98