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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

How we measure these parameters — certificates and measurements

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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.
Want to talk magnets?

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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Product card - 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
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

Technical simulation of the product - report

Presented information are the direct effect of a physical calculation. Values rely on algorithms for the class Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Use these calculations as a supplementary guide when designing systems.

Table 1: Static pull force (pull vs gap) - power drop
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
medium risk
10 mm 1497 Gs
149.7 mT
3.74 kg / 8.24 LBS
3739.6 g / 36.7 N
medium risk
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 load (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: Wall mounting (sliding) - behavior on slippery surfaces
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 (substrate influence) - 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) - thermal limit
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) Shear Strength (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: Protective zones (electronics) - 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
Phone / Smartphone 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) - 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: 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: Submerged application
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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

1. Sliding resistance

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

2. Plate thickness effect

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

3. Thermal stability

*For standard magnets, 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

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: 010051-2026
Quick Unit Converter

Pulling force


Field Strength

Other offers

The offered product is an incredibly powerful rod magnet, produced from durable NdFeB material, which, with dimensions of Ø28.9x10 mm, guarantees the highest energy density. This specific item boasts 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 European logistics center, ensuring rapid order fulfillment. Moreover, its triple-layer 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 electric motors, advanced 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 every gram matters.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure long-term durability 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 a great economic balance and operational stability. 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 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 holding force amounting to approximately 20.74 kg (force ~203.46 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 10 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 as well as weaknesses of Nd2Fe14B magnets.

Strengths

Apart from their superior power, neodymium magnets have these key benefits:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • They possess excellent resistance to magnetism drop due to external magnetic sources,
  • A magnet with a smooth nickel surface is more attractive,
  • Neodymium magnets generate maximum magnetic induction on a contact point, which allows for strong attraction,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
  • Thanks to versatility in shaping and the ability to customize to specific needs,
  • Huge importance in electronics industry – they find application in data components, brushless drives, medical devices, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in compact constructions

Disadvantages

Cons of neodymium magnets: application proposals
  • 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.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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 those in rubber or plastics, which prevent oxidation and corrosion.
  • Limited possibility of creating threads in the magnet and complex shapes - recommended is casing - mounting mechanism.
  • Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these devices are able to be problematic in diagnostics 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

Maximum lifting force for a neodymium magnet – what affects it?

Holding force of 20.74 kg is a theoretical maximum value conducted under standard conditions:
  • using a sheet made of mild steel, serving as a magnetic yoke
  • possessing a thickness of min. 10 mm to avoid saturation
  • characterized by lack of roughness
  • without any air gap between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at temperature room level

Impact of factors on magnetic holding capacity in practice

Please note that the application force may be lower influenced by the following factors, starting with the most relevant:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Metal type – not every steel attracts identically. High carbon content weaken the attraction effect.
  • Base smoothness – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate reduces the holding force.

Safe handling of NdFeB magnets
Mechanical processing

Dust created during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Sensitization to coating

Nickel alert: The Ni-Cu-Ni coating contains nickel. If skin irritation occurs, immediately stop handling magnets and use protective gear.

Safe distance

Device Safety: Strong magnets can ruin data carriers and sensitive devices (pacemakers, medical aids, timepieces).

Pinching danger

Big blocks can break fingers in a fraction of a second. Never place your hand between two attracting surfaces.

Shattering risk

Watch out for shards. Magnets can explode upon violent connection, ejecting shards into the air. Wear goggles.

Product not for children

These products are not suitable for play. Accidental ingestion of several magnets can lead to them attracting across intestines, which poses a direct threat to life and requires immediate surgery.

Do not underestimate power

Handle with care. Neodymium magnets act from a distance and snap with huge force, often faster than you can move away.

ICD Warning

Patients with a pacemaker should maintain an absolute distance from magnets. The magnetic field can interfere with the functioning of the implant.

GPS and phone interference

An intense magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Maintain magnets near a device to prevent breaking the sensors.

Maximum temperature

Do not overheat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Danger! More info about hazards in the article: Safety of working with magnets.