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MW 29.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010052

GTIN/EAN: 5906301810513

Diameter Ø

29.9 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

52.66 g

Magnetization Direction

→ diametrical

Load capacity

21.50 kg / 210.90 N

Magnetic Induction

344.60 mT / 3446 Gs

Coating

[NiCuNi] Nickel

check properties »

24.60 ZŁ with VAT / pcs + price for transport

20.00 ZŁ net + 23% VAT / pcs

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Technical specification - MW 29.9x10 / N38 - cylindrical magnet

Specification / characteristics - MW 29.9x10 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010052
GTIN/EAN 5906301810513
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 29.9 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 52.66 g
Magnetization Direction → diametrical
Load capacity ~ ? 21.50 kg / 210.90 N
Magnetic Induction ~ ? 344.60 mT / 3446 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 29.9x10 / 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

Technical simulation of the magnet - technical parameters

These information are the direct effect of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Operational parameters might slightly differ. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - interaction chart
MW 29.9x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3445 Gs
344.5 mT
 21.50 kg / 47.40 lbs
21500.0 g / 210.9 N
 crushing
1 mm 3261 Gs
326.1 mT
 19.26 kg / 42.45 lbs
19256.6 g / 188.9 N
 crushing
2 mm 3059 Gs
305.9 mT
 16.95 kg / 37.36 lbs
16947.4 g / 166.3 N
 crushing
3 mm 2848 Gs
284.8 mT
 14.70 kg / 32.40 lbs
14696.2 g / 144.2 N
 crushing
5 mm 2425 Gs
242.5 mT
 10.65 kg / 23.48 lbs
10650.1 g / 104.5 N
 crushing
10 mm 1519 Gs
151.9 mT
 4.18 kg / 9.21 lbs
4178.4 g / 41.0 N
 warning
15 mm 930 Gs
93.0 mT
 1.57 kg / 3.45 lbs
1565.8 g / 15.4 N
 safe
20 mm 583 Gs
58.3 mT
 0.62 kg / 1.36 lbs
616.0 g / 6.0 N
 safe
30 mm 258 Gs
25.8 mT
 0.12 kg / 0.27 lbs
121.0 g / 1.2 N
 safe
50 mm 76 Gs
7.6 mT
 0.01 kg / 0.02 lbs
10.4 g / 0.1 N
 safe
Pulling power decreases sharply per each millimeter of spacing. Note that every additional insulation layer (e.g., contamination, paint, dust) noticeably reduces the pull force. Neodymiums hold most effectively at the point of direct contact; gap weakens the power. See how flashily the pull force drop, when the product does not adhere flatly to the metal substrate. When calculating the mounting, eliminate additional spacers.

Table 2: Shear force (vertical surface)
MW 29.9x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.30 kg / 9.48 lbs
4300.0 g / 42.2 N
1 mm Stal (~0.2) 3.85 kg / 8.49 lbs
3852.0 g / 37.8 N
2 mm Stal (~0.2) 3.39 kg / 7.47 lbs
3390.0 g / 33.3 N
3 mm Stal (~0.2) 2.94 kg / 6.48 lbs
2940.0 g / 28.8 N
5 mm Stal (~0.2) 2.13 kg / 4.70 lbs
2130.0 g / 20.9 N
10 mm Stal (~0.2) 0.84 kg / 1.84 lbs
836.0 g / 8.2 N
15 mm Stal (~0.2) 0.31 kg / 0.69 lbs
314.0 g / 3.1 N
20 mm Stal (~0.2) 0.12 kg / 0.27 lbs
124.0 g / 1.2 N
30 mm Stal (~0.2) 0.02 kg / 0.05 lbs
24.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
The table below shows the estimated holding capacity sufficient to start the shifting of the magnet downwards against a upright metal surface (assuming typical friction coefficient). This value depends on the gap size between the magnet and the metal.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 29.9x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
6.45 kg / 14.22 lbs
6450.0 g / 63.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.30 kg / 9.48 lbs
4300.0 g / 42.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.15 kg / 4.74 lbs
2150.0 g / 21.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.75 kg / 23.70 lbs
10750.0 g / 105.5 N
When mounting a holder on a vertical surface (e.g., a board), it you can count on barely about 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip mean that products slide down faster than they pull off. Want to create a vertical fastening? Consider that the shear force is much weaker than the maximum static pull force. On a painted metal, the element will slip down under a noticeably lighter cargo. Application of an anti-slip coating can drastically raise the stability.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 29.9x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.08 kg / 2.37 lbs
1075.0 g / 10.5 N
1 mm
13%
 2.69 kg / 5.92 lbs
2687.5 g / 26.4 N
2 mm
25%
 5.38 kg / 11.85 lbs
5375.0 g / 52.7 N
3 mm
38%
 8.06 kg / 17.77 lbs
8062.5 g / 79.1 N
5 mm
63%
 13.44 kg / 29.62 lbs
13437.5 g / 131.8 N
10 mm
100%
 21.50 kg / 47.40 lbs
21500.0 g / 210.9 N
11 mm
100%
 21.50 kg / 47.40 lbs
21500.0 g / 210.9 N
12 mm
100%
 21.50 kg / 47.40 lbs
21500.0 g / 210.9 N
A thin metal plate cannot conduct the entire magnetic field, which weakens actual performance of the magnet. Should you attach a powerful product to a too thin substrate, the field will penetrate right through and the pull force will drop sharply. To squeeze 100% of this neodymium's power, you need a suitably thick backing of steel. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the holder shows lower pull force. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (stability) - resistance threshold
MW 29.9x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 21.50 kg / 47.40 lbs
21500.0 g / 210.9 N
 OK
40 °C -2.2% 21.03 kg / 46.36 lbs
21027.0 g / 206.3 N
 OK
60 °C -4.4% 20.55 kg / 45.31 lbs
20554.0 g / 201.6 N
80 °C -6.6% 20.08 kg / 44.27 lbs
20081.0 g / 197.0 N
100 °C -28.8% 15.31 kg / 33.75 lbs
15308.0 g / 150.2 N
Classic neodymiums lose parameters after exceeding the maximum temperature. Avoid high temperatures – heat can permanently damage this product. As the temperature rises, the magnet's force briefly drops. Do not use this magnet in hot environments exceeding its safe range. Ignoring the limit will cause permanent loss of magnetism.
*Important note: Temperature resistance is determined by both grade, as well as the dimension ratios. Low-profile magnets (pancake types) may lose charge permanently under lower heat stress compared to rod magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MW 29.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 51.38 kg / 113.28 lbs
4 963 Gs
7.71 kg / 16.99 lbs
7708 g / 75.6 N
 N/A
1 mm 48.76 kg / 107.50 lbs
6 712 Gs
7.31 kg / 16.12 lbs
7314 g / 71.7 N
 43.88 kg / 96.75 lbs
~0 Gs
2 mm 46.02 kg / 101.46 lbs
6 521 Gs
6.90 kg / 15.22 lbs
6903 g / 67.7 N
 41.42 kg / 91.32 lbs
~0 Gs
3 mm 43.26 kg / 95.37 lbs
6 322 Gs
6.49 kg / 14.31 lbs
6489 g / 63.7 N
 38.93 kg / 85.83 lbs
~0 Gs
5 mm 37.78 kg / 83.30 lbs
5 909 Gs
5.67 kg / 12.49 lbs
5667 g / 55.6 N
 34.00 kg / 74.97 lbs
~0 Gs
10 mm 25.45 kg / 56.11 lbs
4 850 Gs
3.82 kg / 8.42 lbs
3818 g / 37.5 N
 22.91 kg / 50.50 lbs
~0 Gs
20 mm 9.99 kg / 22.02 lbs
3 038 Gs
1.50 kg / 3.30 lbs
1498 g / 14.7 N
 8.99 kg / 19.81 lbs
~0 Gs
50 mm 0.63 kg / 1.38 lbs
761 Gs
0.09 kg / 0.21 lbs
94 g / 0.9 N
 0.56 kg / 1.24 lbs
~0 Gs
60 mm 0.29 kg / 0.64 lbs
517 Gs
0.04 kg / 0.10 lbs
43 g / 0.4 N
 0.26 kg / 0.57 lbs
~0 Gs
70 mm 0.14 kg / 0.32 lbs
364 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
 0.13 kg / 0.28 lbs
~0 Gs
80 mm 0.08 kg / 0.17 lbs
265 Gs
0.01 kg / 0.03 lbs
11 g / 0.1 N
 0.07 kg / 0.15 lbs
~0 Gs
90 mm 0.04 kg / 0.09 lbs
198 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.04 kg / 0.08 lbs
~0 Gs
100 mm 0.02 kg / 0.05 lbs
152 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
Two strong neodymiums attract each other from a much further distance than a magnet and steel combination. Such a system of magnet-to-magnet creates a more powerful interaction and a wider radius of performance. Planning to create a strong closure? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is extreme. The repulsion force is marginally weaker than the attraction, but still impressive.
*The magnetic induction between like poles is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).
* Calculations demonstrate shear force of dual identical magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
MW 29.9x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.5 cm
Hearing aid 10 Gs (1.0 mT) 11.0 cm
Timepiece 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 large risk to IT equipment as well as pacemakers. These magnets produce a field that prevents correct functioning of digital equipment. Remember: the unseen radiation acts through matter and plastic. Exceptional care must be taken by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - warning
MW 29.9x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.72 km/h
(6.31 m/s)
 1.05 J
30 mm 35.42 km/h
(9.84 m/s)
 2.55 J
50 mm 45.58 km/h
(12.66 m/s)
 4.22 J
100 mm 64.44 km/h
(17.90 m/s)
 8.44 J
Neodymium magnets are prone to chipping – a collision with steel can result in shattering. Control the attraction moment – a magnet released freely speeds with massive force. Kinetic force can cause material chips or dangerous crushing to fingers. Always hold the magnet during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the magnet. Wear safety glasses when handling with large magnets.

Table 9: Coating parameters (durability)
MW 29.9x10 / 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 following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MW 29.9x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 25 588 Mx 255.9 µWb
Pc Coefficient 0.44 Low (Flat)
Total magnetic flux passing through the pole surface. Key data in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
MW 29.9x10 / N38

Environment Effective steel pull Effect
Air (land) 21.50 kg Standard
Water (riverbed) 24.62 kg
(+3.12 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

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

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically reduces the holding force.

3. Thermal stability

*For standard magnets, the max working temp is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.44

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
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: 010052-2026
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This product is an extremely powerful rod magnet, composed of advanced NdFeB material, which, with dimensions of Ø29.9x10 mm, guarantees optimal power. This specific item features 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. 21.50 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 standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the pull force of 210.90 N with a weight of only 52.66 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
Since our magnets have a tolerance of ±0.1mm, the best method is to glue them into holes with a slightly larger diameter (e.g., 29.9.1 mm) using epoxy glues. 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.
Magnets NdFeB grade N38 are strong enough for 90% 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 (Ø29.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 29.9 mm and height 10 mm. The value of 210.90 N means that the magnet is capable of holding a weight many times exceeding its own mass of 52.66 g. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 10 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 and disadvantages of neodymium magnets.

Strengths

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • They retain attractive force for nearly ten years – the drop is just ~1% (based on simulations),
  • They maintain their magnetic properties even under strong external field,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to look better,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures approaching 230°C and above...
  • Thanks to freedom in shaping and the ability to modify to complex applications,
  • Wide application in modern industrial fields – they find application in HDD drives, drive modules, precision medical tools, also other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise 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 magnets in rubber or plastics, which prevent oxidation as well as corrosion.
  • Limited ability of making threads in the magnet and complicated shapes - recommended is cover - mounting mechanism.
  • Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, tiny parts of these products can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

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

The lifting capacity listed is a theoretical maximum value performed under the following configuration:
  • on a base made of structural steel, optimally conducting the magnetic field
  • possessing a thickness of minimum 10 mm to avoid saturation
  • characterized by smoothness
  • under conditions of no distance (surface-to-surface)
  • for force applied at a right angle (in the magnet axis)
  • in stable room temperature

Determinants of practical lifting force of a magnet

Please note that the application force may be lower subject to the following factors, in order of importance:
  • Distance – the presence of any layer (paint, dirt, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Direction of force – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel grade – ideal substrate is high-permeability steel. Hardened steels may attract less.
  • Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Temperature – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets
Do not give to children

Strictly store magnets away from children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are fatal.

Material brittleness

Watch out for shards. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Operating temperature

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.

Keep away from electronics

Remember: neodymium magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your phone, device, and navigation systems.

Immense force

Handle magnets consciously. Their huge power can surprise even experienced users. Stay alert and do not underestimate their force.

ICD Warning

Patients with a heart stimulator should keep an large gap from magnets. The magnetism can interfere with the operation of the life-saving device.

Allergic reactions

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, immediately stop working with magnets and use protective gear.

Fire warning

Combustion risk: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

Hand protection

Large magnets can smash fingers in a fraction of a second. Never put your hand between two strong magnets.

Cards and drives

Intense magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

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