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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

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23.99 ZŁ with VAT / pcs + price for transport

19.50 ZŁ net + 23% VAT / pcs

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Specifications as well as shape of a neodymium magnet can be checked with 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
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 simulation of the assembly - technical parameters

The following values constitute the direct effect of a engineering calculation. Results rely on algorithms for the material Nd2Fe14B. Real-world performance might slightly differ. Please consider these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs gap) - 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
 dangerous!
1 mm 3327 Gs
332.7 mT
 18.47 kg / 40.71 LBS
18466.2 g / 181.2 N
 dangerous!
2 mm 3111 Gs
311.1 mT
 16.14 kg / 35.59 LBS
16142.6 g / 158.4 N
 dangerous!
3 mm 2886 Gs
288.6 mT
 13.90 kg / 30.63 LBS
13895.8 g / 136.3 N
 dangerous!
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
Grip strength drops significantly per each millimeter of gap. Keep in mind that even a very thin break (e.g., dirt, paint, rust) significantly weakens the grip. Neodymiums work optimally during direct contact; air break weakens the force. Observe how quickly the pull force plummet, when the magnet does not touch directly to the steel surface. When calculating the arrangement, eliminate unnecessary gaps.

Table 2: Slippage 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
This section indicates the estimated weight limit sufficient to cause the shifting of the magnet down against a upright steel wall (assuming typical friction coefficient). This value depends on the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - 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
When hanging a magnet on a upright surface (e.g., a board), it you can count on only approx. 1/5 of its maximum pull force. Gravitational force and a low friction coefficient cause that holders move down faster than they pull off. Want to create a hanger? Remember that the shear force is much weaker than the perpendicular breakaway force. On a smooth steel, the element will give way down under a significantly smaller load. Utilizing a rubberized coating can significantly increase the grip.

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
A too thin steel is unable to take in the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a thin surface, the magnetism will penetrate right through and the attraction force will be weaker. To utilize 100% of this magnet's power, you require a sufficiently solid backing of metal. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the holder works worse. We advise picking the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - 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
Classic neodymiums irreversibly lose parameters past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly demagnetize this product. With increasing heat, the neodymium's power momentarily lowers. Refrain from using this product near heat sources higher than its operating temperature limit. Too high temperature will lead to permanent loss of magnetism.
*Technical advisory: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than taller cylinders. The danger warning in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MW 28.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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
Two magnets interact from a much further distance than a magnet and sheet setup. The connection of magnet-to-magnet generates a stronger field and a larger range of operation. Want to build a powerful holder? Utilize two neodymiums instead of a neodymium and a striker plate. Exercise caution that when bringing together two magnets, the pinch force is extreme. The repulsion force is marginally weaker than the connection force, but still large.
*Field value between like poles drops to ~0 Gs at the midpoint of the gap (resulting from vector opposition).
Note: Results apply to shear force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

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
Powerful magnet radiation is a serious hazard to electronic devices and medical implants. These NdFeB products produce a field that disrupts operation of digital equipment. Remember: the unseen radiation acts through matter and plastic. Exceptional care must be exercised by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - 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
NdFeB products are delicate – a collision with steel causes immediate chipping. Watch the impact speed – a neodymium left loose turns into a projectile. Kinetic force can destroy the magnet or dangerous crushing to skin. Be sure to control the product during mounting so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

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)
Total magnetic flux emitted by the pole surface. Key data when building generators and motors. Pc value defines the working geometry.

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%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Warning: On a vertical wall, the magnet retains only approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Heat tolerance

*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) = 0.45

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.

Engineering data and GPSR
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: 010051-2026
Measurement Calculator
Magnet pull force
Magnetic Induction
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This product is an incredibly powerful rod magnet, composed of modern NdFeB material, which, with dimensions of Ø28.9x10 mm, guarantees the highest energy density. The MW 28.9x10 / N38 component boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for professional engineers and designers. As a magnetic rod with significant force (approx. 20.74 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 203.46 N with a weight of only 49.2 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional 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 high magnetic energy density. 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 external factors, 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. 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.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • Their magnetic field is maintained, and after around 10 years it decreases only by ~1% (theoretically),
  • They feature excellent resistance to magnetic field loss due to external magnetic sources,
  • In other words, due to the smooth finish of gold, the element gains a professional look,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Neodymium magnets are characterized by very 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 flexibility in designing and the capacity to adapt to unusual requirements,
  • Fundamental importance in modern technologies – they are used in hard drives, motor assemblies, medical devices, and industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Limitations

What to avoid - cons of neodymium magnets: tips and applications.
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which becomes key in the context of child safety. Additionally, small components of these products are able to be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Lifting parameters

Magnetic strength at its maximum – what it depends on?

Information about lifting capacity was determined for ideal contact conditions, including:
  • on a block made of structural steel, perfectly concentrating the magnetic field
  • with a thickness of at least 10 mm
  • characterized by lack of roughness
  • under conditions of ideal adhesion (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

Effective lifting capacity is influenced by specific conditions, such as (from priority):
  • Distance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Base massiveness – too thin sheet does not accept the full field, causing part of the power to be lost to the other side.
  • Steel type – mild steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Temperature – temperature increase results in weakening of induction. Check the thermal limit for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with NdFeB magnets
Data carriers

Do not bring magnets close to a purse, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

Precision electronics

GPS units and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Safe operation

Handle magnets consciously. Their immense force can surprise even experienced users. Plan your moves and do not underestimate their power.

Medical implants

For implant holders: Strong magnetic fields affect electronics. Keep at least 30 cm distance or request help to work with the magnets.

Finger safety

Big blocks can smash fingers instantly. Do not put your hand betwixt two attracting surfaces.

Magnet fragility

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Impact of two magnets leads to them cracking into shards.

Heat warning

Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and strength.

This is not a toy

Always keep magnets out of reach of children. Ingestion danger is significant, and the effects of magnets clamping inside the body are tragic.

Flammability

Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Allergy Warning

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, avoid direct skin contact or select versions in plastic housing.

Warning! Looking for details? Read our article: Why are neodymium magnets dangerous?