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MW 28.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010051

GTIN/EAN: 5906301810506

Load capacity 20.74 kg / 203.46 N Magnetic Induction 352.70 mT / 3527 Gs
Diameter Ø
28.9 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
49.2 g
Magnetization Direction
→ diametrical
Coating
[NiCuNi] Nickel

23.99 with VAT / pcs + price for transport

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Technical of the product - MW 28.9x10 / N38 - cylindrical magnet

Specification / characteristics - MW 28.9x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010051
GTIN/EAN 5906301810506
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 28.9 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 49.2 g
Magnetization Direction → diametrical
Load capacity ~ ? 20.74 kg / 203.46 N
Magnetic Induction ~ ? 352.70 mT / 3527 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 28.9x10 / 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 magnet - data

Presented values constitute the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MW 28.9x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3526 Gs
352.6 mT
20.74 kg / 45.72 LBS
20740.0 g / 203.5 N
critical level
1 mm 3327 Gs
332.7 mT
18.47 kg / 40.71 LBS
18466.2 g / 181.2 N
critical level
2 mm 3111 Gs
311.1 mT
16.14 kg / 35.59 LBS
16142.6 g / 158.4 N
critical level
3 mm 2886 Gs
288.6 mT
13.90 kg / 30.63 LBS
13895.8 g / 136.3 N
critical level
5 mm 2438 Gs
243.8 mT
9.91 kg / 21.85 LBS
9912.0 g / 97.2 N
strong
10 mm 1497 Gs
149.7 mT
3.74 kg / 8.24 LBS
3739.6 g / 36.7 N
strong
15 mm 903 Gs
90.3 mT
1.36 kg / 3.00 LBS
1359.1 g / 13.3 N
weak grip
20 mm 560 Gs
56.0 mT
0.52 kg / 1.15 LBS
523.5 g / 5.1 N
weak grip
30 mm 245 Gs
24.5 mT
0.10 kg / 0.22 LBS
100.4 g / 1.0 N
weak grip
50 mm 71 Gs
7.1 mT
0.01 kg / 0.02 LBS
8.5 g / 0.1 N
weak grip

Table 2: Sliding hold (vertical surface)
MW 28.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.15 kg / 9.14 LBS
4148.0 g / 40.7 N
1 mm Stal (~0.2) 3.69 kg / 8.14 LBS
3694.0 g / 36.2 N
2 mm Stal (~0.2) 3.23 kg / 7.12 LBS
3228.0 g / 31.7 N
3 mm Stal (~0.2) 2.78 kg / 6.13 LBS
2780.0 g / 27.3 N
5 mm Stal (~0.2) 1.98 kg / 4.37 LBS
1982.0 g / 19.4 N
10 mm Stal (~0.2) 0.75 kg / 1.65 LBS
748.0 g / 7.3 N
15 mm Stal (~0.2) 0.27 kg / 0.60 LBS
272.0 g / 2.7 N
20 mm Stal (~0.2) 0.10 kg / 0.23 LBS
104.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.04 LBS
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N

Table 3: Vertical assembly (shearing) - vertical pull
MW 28.9x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
6.22 kg / 13.72 LBS
6222.0 g / 61.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.15 kg / 9.14 LBS
4148.0 g / 40.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.07 kg / 4.57 LBS
2074.0 g / 20.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.37 kg / 22.86 LBS
10370.0 g / 101.7 N

Table 4: Material efficiency (saturation) - sheet metal selection
MW 28.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.04 kg / 2.29 LBS
1037.0 g / 10.2 N
1 mm
13%
2.59 kg / 5.72 LBS
2592.5 g / 25.4 N
2 mm
25%
5.19 kg / 11.43 LBS
5185.0 g / 50.9 N
3 mm
38%
7.78 kg / 17.15 LBS
7777.5 g / 76.3 N
5 mm
63%
12.96 kg / 28.58 LBS
12962.5 g / 127.2 N
10 mm
100%
20.74 kg / 45.72 LBS
20740.0 g / 203.5 N
11 mm
100%
20.74 kg / 45.72 LBS
20740.0 g / 203.5 N
12 mm
100%
20.74 kg / 45.72 LBS
20740.0 g / 203.5 N

Table 5: Thermal stability (stability) - power drop
MW 28.9x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 20.74 kg / 45.72 LBS
20740.0 g / 203.5 N
OK
40 °C -2.2% 20.28 kg / 44.72 LBS
20283.7 g / 199.0 N
OK
60 °C -4.4% 19.83 kg / 43.71 LBS
19827.4 g / 194.5 N
80 °C -6.6% 19.37 kg / 42.71 LBS
19371.2 g / 190.0 N
100 °C -28.8% 14.77 kg / 32.56 LBS
14766.9 g / 144.9 N

Table 6: Two magnets (repulsion) - field collision
MW 28.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 50.29 kg / 110.86 LBS
5 022 Gs
7.54 kg / 16.63 LBS
7543 g / 74.0 N
N/A
1 mm 47.58 kg / 104.90 LBS
6 860 Gs
7.14 kg / 15.74 LBS
7138 g / 70.0 N
42.83 kg / 94.41 LBS
~0 Gs
2 mm 44.77 kg / 98.71 LBS
6 655 Gs
6.72 kg / 14.81 LBS
6716 g / 65.9 N
40.30 kg / 88.84 LBS
~0 Gs
3 mm 41.95 kg / 92.48 LBS
6 441 Gs
6.29 kg / 13.87 LBS
6292 g / 61.7 N
37.75 kg / 83.23 LBS
~0 Gs
5 mm 36.38 kg / 80.20 LBS
5 999 Gs
5.46 kg / 12.03 LBS
5457 g / 53.5 N
32.74 kg / 72.18 LBS
~0 Gs
10 mm 24.03 kg / 52.98 LBS
4 876 Gs
3.60 kg / 7.95 LBS
3605 g / 35.4 N
21.63 kg / 47.69 LBS
~0 Gs
20 mm 9.07 kg / 19.99 LBS
2 995 Gs
1.36 kg / 3.00 LBS
1360 g / 13.3 N
8.16 kg / 17.99 LBS
~0 Gs
50 mm 0.53 kg / 1.17 LBS
726 Gs
0.08 kg / 0.18 LBS
80 g / 0.8 N
0.48 kg / 1.06 LBS
~0 Gs
60 mm 0.24 kg / 0.54 LBS
491 Gs
0.04 kg / 0.08 LBS
37 g / 0.4 N
0.22 kg / 0.48 LBS
~0 Gs
70 mm 0.12 kg / 0.26 LBS
345 Gs
0.02 kg / 0.04 LBS
18 g / 0.2 N
0.11 kg / 0.24 LBS
~0 Gs
80 mm 0.06 kg / 0.14 LBS
250 Gs
0.01 kg / 0.02 LBS
9 g / 0.1 N
0.06 kg / 0.13 LBS
~0 Gs
90 mm 0.04 kg / 0.08 LBS
187 Gs
0.01 kg / 0.01 LBS
5 g / 0.1 N
0.03 kg / 0.07 LBS
~0 Gs
100 mm 0.02 kg / 0.05 LBS
143 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
0.02 kg / 0.04 LBS
~0 Gs

Table 7: Hazards (implants) - warnings
MW 28.9x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.5 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.5 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm

Table 8: Impact energy (kinetic energy) - warning
MW 28.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.58 km/h
(6.55 m/s)
1.06 J
30 mm 25.54 km/h
(7.09 m/s)
1.24 J
50 mm 25.61 km/h
(7.11 m/s)
1.24 J
100 mm 25.62 km/h
(7.12 m/s)
1.25 J

Table 9: Anti-corrosion coating durability
MW 28.9x10 / 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 28.9x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 24 347 Mx 243.5 µWb
Pc Coefficient 0.45 Low (Flat)

Table 11: Physics of underwater searching
MW 28.9x10 / N38

Environment Effective steel pull Effect
Air (land) 20.74 kg Standard
Water (riverbed) 23.75 kg
(+3.01 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

1. Vertical hold

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

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Heat tolerance

*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) = 0.45

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

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%

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: 010051-2026
Measurement Calculator

Magnet pull force


Magnetic Field

Other offers

The offered product is an extremely powerful cylindrical magnet, produced from durable NdFeB material, which, with dimensions of Ø28.9x10 mm, guarantees the highest energy density. The MW 28.9x10 / N38 model is characterized by high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with impressive force (approx. 20.74 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 203.46 N with a weight of only 49.2 g, this rod is indispensable in electronics and wherever low weight is crucial.
Since our magnets have a very precise dimensions, the best method is to glue them into holes with a slightly larger diameter (e.g., 28.9.1 mm) using epoxy glues. To ensure stability in automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for the majority of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø28.9x10), 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 28.9 mm and height 10 mm. The value of 203.46 N means that the magnet is capable of holding a weight many times exceeding its own mass of 49.2 g. The product has a [NiCuNi] coating, which protects the surface 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 28.9 mm. Such an arrangement is most desirable 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.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under external field action,
  • In other words, due to the shiny finish of nickel, the element gains visual value,
  • Magnets are characterized by maximum magnetic induction on the outer side,
  • 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...
  • Thanks to flexibility in constructing and the ability to customize to specific needs,
  • Significant place in high-tech industry – they are commonly used in computer drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • under axial force direction (90-degree angle)
  • at standard ambient temperature

Lifting capacity in real conditions – factors

Real force impacted by specific conditions, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Safe distance

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

Compass and GPS

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.

Product not for children

These products are not toys. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

Handling guide

Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.

Shattering risk

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

Health Danger

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Dust is flammable

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Pinching danger

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Warning! Details about risks in the article: Safety of working with magnets.