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MW 12x6 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010021

GTIN/EAN: 5906301810209

5.00
Load capacity 4.60 kg / 45.09 N Magnetic Induction 437.99 mT / 4380 Gs
Diameter Ø
12 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
5.09 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

1.530net / pcs

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Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical of the product - MW 12x6 / N38 - cylindrical magnet

Specification / characteristics - MW 12x6 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010021
GTIN/EAN 5906301810209
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 6 mm [±0,1 mm]
Weight 5.09 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.60 kg / 45.09 N
Magnetic Induction ~ ? 437.99 mT / 4380 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 12x6 / N38 - cylindrical magnet
properties values units
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 product - technical parameters

These values represent the direct effect of a mathematical simulation. Results are based on algorithms for the class Nd2Fe14B. Actual parameters might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap for designers.

Table 1: Static force (pull vs distance) - characteristics
MW 12x6 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4377 Gs
437.7 mT
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
medium risk
1 mm 3688 Gs
368.8 mT
3.27 kg / 7.20 lbs
3265.4 g / 32.0 N
medium risk
2 mm 2999 Gs
299.9 mT
2.16 kg / 4.76 lbs
2159.7 g / 21.2 N
medium risk
3 mm 2386 Gs
238.6 mT
1.37 kg / 3.01 lbs
1366.7 g / 13.4 N
safe
5 mm 1474 Gs
147.4 mT
0.52 kg / 1.15 lbs
521.4 g / 5.1 N
safe
10 mm 489 Gs
48.9 mT
0.06 kg / 0.13 lbs
57.4 g / 0.6 N
safe
15 mm 205 Gs
20.5 mT
0.01 kg / 0.02 lbs
10.1 g / 0.1 N
safe
20 mm 103 Gs
10.3 mT
0.00 kg / 0.01 lbs
2.5 g / 0.0 N
safe
30 mm 36 Gs
3.6 mT
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
safe
50 mm 9 Gs
0.9 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
safe

Table 2: Sliding force (vertical surface)
MW 12x6 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.92 kg / 2.03 lbs
920.0 g / 9.0 N
1 mm Stal (~0.2) 0.65 kg / 1.44 lbs
654.0 g / 6.4 N
2 mm Stal (~0.2) 0.43 kg / 0.95 lbs
432.0 g / 4.2 N
3 mm Stal (~0.2) 0.27 kg / 0.60 lbs
274.0 g / 2.7 N
5 mm Stal (~0.2) 0.10 kg / 0.23 lbs
104.0 g / 1.0 N
10 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 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 (sliding) - behavior on slippery surfaces
MW 12x6 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.38 kg / 3.04 lbs
1380.0 g / 13.5 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.92 kg / 2.03 lbs
920.0 g / 9.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.46 kg / 1.01 lbs
460.0 g / 4.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.30 kg / 5.07 lbs
2300.0 g / 22.6 N

Table 4: Material efficiency (substrate influence) - power losses
MW 12x6 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.46 kg / 1.01 lbs
460.0 g / 4.5 N
1 mm
25%
1.15 kg / 2.54 lbs
1150.0 g / 11.3 N
2 mm
50%
2.30 kg / 5.07 lbs
2300.0 g / 22.6 N
3 mm
75%
3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
5 mm
100%
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
10 mm
100%
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
11 mm
100%
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
12 mm
100%
4.60 kg / 10.14 lbs
4600.0 g / 45.1 N

Table 5: Thermal resistance (stability) - thermal limit
MW 12x6 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.60 kg / 10.14 lbs
4600.0 g / 45.1 N
OK
40 °C -2.2% 4.50 kg / 9.92 lbs
4498.8 g / 44.1 N
OK
60 °C -4.4% 4.40 kg / 9.70 lbs
4397.6 g / 43.1 N
80 °C -6.6% 4.30 kg / 9.47 lbs
4296.4 g / 42.1 N
100 °C -28.8% 3.28 kg / 7.22 lbs
3275.2 g / 32.1 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 12x6 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.36 kg / 29.45 lbs
5 536 Gs
2.00 kg / 4.42 lbs
2004 g / 19.7 N
N/A
1 mm 11.39 kg / 25.10 lbs
8 082 Gs
1.71 kg / 3.77 lbs
1708 g / 16.8 N
10.25 kg / 22.59 lbs
~0 Gs
2 mm 9.48 kg / 20.91 lbs
7 376 Gs
1.42 kg / 3.14 lbs
1423 g / 14.0 N
8.54 kg / 18.82 lbs
~0 Gs
3 mm 7.77 kg / 17.12 lbs
6 675 Gs
1.17 kg / 2.57 lbs
1165 g / 11.4 N
6.99 kg / 15.41 lbs
~0 Gs
5 mm 5.01 kg / 11.05 lbs
5 361 Gs
0.75 kg / 1.66 lbs
752 g / 7.4 N
4.51 kg / 9.94 lbs
~0 Gs
10 mm 1.51 kg / 3.34 lbs
2 948 Gs
0.23 kg / 0.50 lbs
227 g / 2.2 N
1.36 kg / 3.01 lbs
~0 Gs
20 mm 0.17 kg / 0.37 lbs
978 Gs
0.02 kg / 0.06 lbs
25 g / 0.2 N
0.15 kg / 0.33 lbs
~0 Gs
50 mm 0.00 kg / 0.01 lbs
116 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
72 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
48 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
33 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
24 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
18 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) - warnings
MW 12x6 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.0 cm
Remote 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (cracking risk) - collision effects
MW 12x6 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.57 km/h
(6.55 m/s)
0.11 J
30 mm 23.75 km/h
(6.60 m/s)
0.11 J
50 mm 23.75 km/h
(6.60 m/s)
0.11 J
100 mm 23.75 km/h
(6.60 m/s)
0.11 J

Table 9: Anti-corrosion coating durability
MW 12x6 / 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 12x6 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 024 Mx 50.2 µWb
Pc Coefficient 0.59 Low (Flat)

Table 11: Physics of underwater searching
MW 12x6 / N38

Environment Effective steel pull Effect
Air (land) 4.60 kg Standard
Water (riverbed) 5.27 kg
(+0.67 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. Sliding resistance

*Warning: On a vertical wall, the magnet holds just approx. 20-30% of its max power.

2. Plate thickness effect

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

3. Power loss vs temp

*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) = 0.59

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%

Sustainability

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: 010021-2026
Quick Unit Converter

Magnet pull force


Magnetic Field

Other products

The presented product is an exceptionally strong cylinder magnet, produced from durable NdFeB material, which, with dimensions of Ø12x6 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 4.60 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 45.09 N with a weight of only 5.09 g, this rod is indispensable in electronics and wherever every gram matters.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 12.1 mm) using epoxy glues. To ensure stability in industry, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø12x6), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
This model is characterized by dimensions Ø12x6 mm, which, at a weight of 5.09 g, makes it an element with high magnetic energy density. The value of 45.09 N means that the magnet is capable of holding a weight many times exceeding its own mass of 5.09 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 6 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is standard when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized through the diameter if your project requires it.

Strengths and weaknesses of neodymium magnets.

Benefits

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • Their magnetic field is durable, and after around ten years it drops only by ~1% (theoretically),
  • They show high resistance to demagnetization induced by external field influence,
  • Thanks to the shimmering finish, the surface of Ni-Cu-Ni, gold, or silver gives an elegant appearance,
  • Magnets are characterized by very high magnetic induction on the outer layer,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures approaching 230°C and above...
  • Due to the potential of free shaping and customization to custom solutions, NdFeB magnets can be produced in a broad palette of forms and dimensions, which makes them more universal,
  • Key role in electronics industry – they serve a role in computer drives, brushless drives, medical devices, as well as industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Problematic aspects of neodymium magnets and proposals for their use:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • 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, as well as 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 usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We recommend casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small components of these devices are able to complicate diagnosis medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

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

Breakaway force was determined for ideal contact conditions, taking into account:
  • using a sheet made of mild steel, functioning as a magnetic yoke
  • whose transverse dimension reaches at least 10 mm
  • with a plane perfectly flat
  • without the slightest air gap between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

Bear in mind that the application force may be lower subject to the following factors, in order of importance:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • 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).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Steel grade – the best choice is pure iron steel. Hardened steels may attract less.
  • Base smoothness – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate decreases the load capacity.

Safety rules for work with neodymium magnets
Danger to pacemakers

Patients with a pacemaker have to keep an absolute distance from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Allergic reactions

Medical facts indicate that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, refrain from touching magnets with bare hands and select coated magnets.

Thermal limits

Monitor thermal conditions. Heating the magnet to high heat will permanently weaken its properties and pulling force.

Physical harm

Danger of trauma: The pulling power is so great that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.

Risk of cracking

NdFeB magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets will cause them breaking into shards.

No play value

These products are not intended for children. Swallowing a few magnets may result in them attracting across intestines, which constitutes a critical condition and requires immediate surgery.

Dust explosion hazard

Mechanical processing of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Safe operation

Be careful. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can move away.

GPS Danger

Remember: neodymium magnets produce a field that interferes with precision electronics. Maintain a safe distance from your mobile, tablet, and GPS.

Threat to electronics

Very strong magnetic fields can erase data on credit cards, hard drives, and storage devices. Stay away of min. 10 cm.

Caution! Want to know more? Check our post: Why are neodymium magnets dangerous?