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MW 28.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010051

GTIN/EAN: 5906301810506

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

23.99 with VAT / pcs + price for transport

19.50 ZŁ net + 23% VAT / pcs

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Technical parameters - 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

Physical analysis of the magnet - data

These values represent the result of a physical calculation. Values rely on models for the class Nd2Fe14B. Operational conditions may deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (force 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
crushing
1 mm 3327 Gs
332.7 mT
18.47 kg / 40.71 lbs
18466.2 g / 181.2 N
crushing
2 mm 3111 Gs
311.1 mT
16.14 kg / 35.59 lbs
16142.6 g / 158.4 N
crushing
3 mm 2886 Gs
288.6 mT
13.90 kg / 30.63 lbs
13895.8 g / 136.3 N
crushing
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
safe
20 mm 560 Gs
56.0 mT
0.52 kg / 1.15 lbs
523.5 g / 5.1 N
safe
30 mm 245 Gs
24.5 mT
0.10 kg / 0.22 lbs
100.4 g / 1.0 N
safe
50 mm 71 Gs
7.1 mT
0.01 kg / 0.02 lbs
8.5 g / 0.1 N
safe

Table 2: Shear capacity (wall)
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) - power losses
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: Working in heat (stability) - resistance threshold
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) - precautionary measures
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
Car key 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: Dynamics (kinetic energy) - collision effects
MW 28.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.92 km/h
(6.37 m/s)
1.00 J
30 mm 35.97 km/h
(9.99 m/s)
2.46 J
50 mm 46.31 km/h
(12.86 m/s)
4.07 J
100 mm 65.48 km/h
(18.19 m/s)
8.14 J

Table 9: Surface protection spec
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 (Pc)
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: Hydrostatics and buoyancy
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

*Warning: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Efficiency vs thickness

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

3. Temperature resistance

*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) = 0.45

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 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%
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: 010051-2026
Quick Unit Converter
Pulling force

Magnetic Field

Other proposals

The presented product is a very strong cylindrical magnet, composed of durable NdFeB material, which, with dimensions of Ø28.9x10 mm, guarantees the highest energy density. The MW 28.9x10 / N38 model features an accuracy of ±0.1mm and industrial 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 in stock from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 203.46 N with a weight of only 49.2 g, this rod is indispensable in miniature devices 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., 28.9.1 mm) using two-component epoxy glues. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability 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 (Ø28.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
This model is characterized by dimensions Ø28.9x10 mm, which, at a weight of 49.2 g, makes it an element with impressive magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 20.74 kg (force ~203.46 N), which, with such compact dimensions, proves the high power of the NdFeB material. 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 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.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have stable power, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
  • They show high resistance to demagnetization induced by external field influence,
  • A magnet with a shiny nickel surface looks better,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to freedom in shaping and the capacity to adapt to unusual requirements,
  • Versatile presence in future technologies – they serve a role in computer drives, electric motors, advanced medical instruments, also multitasking production systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their force 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 rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing nuts in the magnet and complicated shapes - recommended is casing - magnetic holder.
  • Health risk related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Lifting parameters

Breakaway strength of the magnet in ideal conditionswhat contributes to it?

Breakaway force is the result of a measurement for optimal configuration, taking into account:
  • using a sheet made of high-permeability steel, functioning as a magnetic yoke
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with an ideally smooth touching surface
  • with direct contact (without impurities)
  • during detachment in a direction perpendicular to the mounting surface
  • at ambient temperature room level

Key elements affecting lifting force

It is worth knowing that the application force will differ depending on elements below, in order of importance:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Base massiveness – insufficiently thick plate does not close the flux, causing part of the power to be escaped into the air.
  • Steel type – mild steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate reduces the lifting capacity.

H&S for magnets
Powerful field

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.

Warning for heart patients

Individuals with a ICD have to keep an absolute distance from magnets. The magnetism can interfere with the functioning of the life-saving device.

Impact on smartphones

Note: neodymium magnets produce a field that disrupts precision electronics. Maintain a separation from your phone, device, and GPS.

Maximum temperature

Control the heat. Heating the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Pinching danger

Large magnets can smash fingers instantly. Do not place your hand betwixt two strong magnets.

Keep away from computers

Device Safety: Strong magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Dust explosion hazard

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Metal Allergy

Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation appears, cease handling magnets and wear gloves.

Beware of splinters

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Choking Hazard

Neodymium magnets are not intended for children. Eating several magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and requires immediate surgery.

Caution! Looking for details? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98