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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

technical parameters »

24.60 ZŁ with VAT / pcs + price for transport

20.00 ZŁ net + 23% VAT / pcs

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Technical of the product - 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

Physical simulation of the magnet - technical parameters

Presented data are the direct effect of a physical analysis. Results rely on models for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Use these data as a preliminary roadmap when designing systems.

Table 1: Static force (force vs gap) - power drop
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 pounds
21500.0 g / 210.9 N
 crushing
1 mm 3261 Gs
326.1 mT
 19.26 kg / 42.45 pounds
19256.6 g / 188.9 N
 crushing
2 mm 3059 Gs
305.9 mT
 16.95 kg / 37.36 pounds
16947.4 g / 166.3 N
 crushing
3 mm 2848 Gs
284.8 mT
 14.70 kg / 32.40 pounds
14696.2 g / 144.2 N
 crushing
5 mm 2425 Gs
242.5 mT
 10.65 kg / 23.48 pounds
10650.1 g / 104.5 N
 crushing
10 mm 1519 Gs
151.9 mT
 4.18 kg / 9.21 pounds
4178.4 g / 41.0 N
 strong
15 mm 930 Gs
93.0 mT
 1.57 kg / 3.45 pounds
1565.8 g / 15.4 N
 safe
20 mm 583 Gs
58.3 mT
 0.62 kg / 1.36 pounds
616.0 g / 6.0 N
 safe
30 mm 258 Gs
25.8 mT
 0.12 kg / 0.27 pounds
121.0 g / 1.2 N
 safe
50 mm 76 Gs
7.6 mT
 0.01 kg / 0.02 pounds
10.4 g / 0.1 N
 safe
Grip strength drops drastically with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., dirt, paint, dust) noticeably weakens the grip. Neodymiums hold strongest at the point of direct contact; air break weakens the power. Observe how flashily the load capacity fall, when the product does not adhere directly to the steel surface. When calculating the arrangement, discard additional spacers.

Table 2: Slippage hold (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 pounds
4300.0 g / 42.2 N
1 mm Stal (~0.2) 3.85 kg / 8.49 pounds
3852.0 g / 37.8 N
2 mm Stal (~0.2) 3.39 kg / 7.47 pounds
3390.0 g / 33.3 N
3 mm Stal (~0.2) 2.94 kg / 6.48 pounds
2940.0 g / 28.8 N
5 mm Stal (~0.2) 2.13 kg / 4.70 pounds
2130.0 g / 20.9 N
10 mm Stal (~0.2) 0.84 kg / 1.84 pounds
836.0 g / 8.2 N
15 mm Stal (~0.2) 0.31 kg / 0.69 pounds
314.0 g / 3.1 N
20 mm Stal (~0.2) 0.12 kg / 0.27 pounds
124.0 g / 1.2 N
30 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
The table below calculates the theoretical shear load sufficient to cause the slippage of the magnet downwards along a upright metal surface (assuming standard friction coefficient). The holding force varies with the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - 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 pounds
6450.0 g / 63.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.30 kg / 9.48 pounds
4300.0 g / 42.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.15 kg / 4.74 pounds
2150.0 g / 21.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
10.75 kg / 23.70 pounds
10750.0 g / 105.5 N
When hanging a magnet on a upright plane (e.g., a car body), it you can count on only approx. 1/5 of nominal attraction strength. Gravity as well as a low friction coefficient influence the fact that products slip faster than they pop off the substrate. Want to create a wall mount? Remember that the sliding force is noticeably lower than the maximum static pull force. On a smooth steel, the element will slide down under a noticeably lighter cargo. Using a rubber pad can effectively increase the grip.

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 pounds
1075.0 g / 10.5 N
1 mm
13%
 2.69 kg / 5.92 pounds
2687.5 g / 26.4 N
2 mm
25%
 5.38 kg / 11.85 pounds
5375.0 g / 52.7 N
3 mm
38%
 8.06 kg / 17.77 pounds
8062.5 g / 79.1 N
5 mm
63%
 13.44 kg / 29.62 pounds
13437.5 g / 131.8 N
10 mm
100%
 21.50 kg / 47.40 pounds
21500.0 g / 210.9 N
11 mm
100%
 21.50 kg / 47.40 pounds
21500.0 g / 210.9 N
12 mm
100%
 21.50 kg / 47.40 pounds
21500.0 g / 210.9 N
A too thin steel cannot focus the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a thin surface, the magnetism will pass right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's power, you require a sufficiently solid backing of metal. The material oversaturation causes that on thin elements (e.g., appliance housings), the product works worse. We advise picking the steel thickness based on the following data.

Table 5: Working in heat (stability) - power drop
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 pounds
21500.0 g / 210.9 N
 OK
40 °C -2.2% 21.03 kg / 46.36 pounds
21027.0 g / 206.3 N
 OK
60 °C -4.4% 20.55 kg / 45.31 pounds
20554.0 g / 201.6 N
80 °C -6.6% 20.08 kg / 44.27 pounds
20081.0 g / 197.0 N
100 °C -28.8% 15.31 kg / 33.75 pounds
15308.0 g / 150.2 N
Classic neodymiums change their properties parameters after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly destroy this product. With every degree above norm, the neodymium's force briefly drops. Avoid using this magnet close to heaters higher than its working range. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Engineering note: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Thin magnets (pancake types) are more susceptible to demagnetization under lower heat stress compared to rod magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

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

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 51.38 kg / 113.28 pounds
4 963 Gs
7.71 kg / 16.99 pounds
7708 g / 75.6 N
 N/A
1 mm 48.76 kg / 107.50 pounds
6 712 Gs
7.31 kg / 16.12 pounds
7314 g / 71.7 N
 43.88 kg / 96.75 pounds
~0 Gs
2 mm 46.02 kg / 101.46 pounds
6 521 Gs
6.90 kg / 15.22 pounds
6903 g / 67.7 N
 41.42 kg / 91.32 pounds
~0 Gs
3 mm 43.26 kg / 95.37 pounds
6 322 Gs
6.49 kg / 14.31 pounds
6489 g / 63.7 N
 38.93 kg / 85.83 pounds
~0 Gs
5 mm 37.78 kg / 83.30 pounds
5 909 Gs
5.67 kg / 12.49 pounds
5667 g / 55.6 N
 34.00 kg / 74.97 pounds
~0 Gs
10 mm 25.45 kg / 56.11 pounds
4 850 Gs
3.82 kg / 8.42 pounds
3818 g / 37.5 N
 22.91 kg / 50.50 pounds
~0 Gs
20 mm 9.99 kg / 22.02 pounds
3 038 Gs
1.50 kg / 3.30 pounds
1498 g / 14.7 N
 8.99 kg / 19.81 pounds
~0 Gs
50 mm 0.63 kg / 1.38 pounds
761 Gs
0.09 kg / 0.21 pounds
94 g / 0.9 N
 0.56 kg / 1.24 pounds
~0 Gs
60 mm 0.29 kg / 0.64 pounds
517 Gs
0.04 kg / 0.10 pounds
43 g / 0.4 N
 0.26 kg / 0.57 pounds
~0 Gs
70 mm 0.14 kg / 0.32 pounds
364 Gs
0.02 kg / 0.05 pounds
22 g / 0.2 N
 0.13 kg / 0.28 pounds
~0 Gs
80 mm 0.08 kg / 0.17 pounds
265 Gs
0.01 kg / 0.03 pounds
11 g / 0.1 N
 0.07 kg / 0.15 pounds
~0 Gs
90 mm 0.04 kg / 0.09 pounds
198 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
100 mm 0.02 kg / 0.05 pounds
152 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
Two magnetic products attract each other from a significantly greater distance than a magnet and sheet setup. Such a system of magnet-to-magnet generates a stronger field and a further horizon of performance. Want to build a solid fastener? Apply two magnets instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the impact force is huge. The levitation is slightly lower than the attraction, but still large.
*Flux density for N-N configuration reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Attention: Results refer to shear force of dual identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Protective zones (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
Mechanical watch 20 Gs (2.0 mT) 8.5 cm
Phone / Smartphone 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
Extremely neodym field is a real danger to electronic devices as well as medical implants. These NdFeB products generate a flux that destroys function of digital equipment. Remember: the invisible magnetic field penetrates the body and glass. Exceptional care must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, remotes, membranes, and screens. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
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
Magnetic elements are very brittle – a collision with steel risks their cracking. Pay attention to connection velocity – a magnet released freely becomes dangerous. Striking energy can cause material chips or painful pinches to skin. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Corrosion resistance
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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
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 emitted by the magnet pole. Essential parameter when building generators and motors. The Pc coefficient determines the working geometry.

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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

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

2. Efficiency vs thickness

*Thin steel (e.g. computer case) significantly limits the holding force.

3. Heat tolerance

*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.

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%
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: 010052-2026
Magnet Unit Converter
Pulling force
Field Strength
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The offered product is an incredibly powerful cylindrical magnet, made from durable NdFeB material, which, with dimensions of Ø29.9x10 mm, guarantees optimal power. This specific item boasts a tolerance of ±0.1mm and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 21.50 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 standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 210.90 N with a weight of only 52.66 g, this rod is indispensable in electronics and wherever every gram matters.
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., 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 N38 are strong enough for the majority of applications in modeling and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø29.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
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. 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 and disadvantages of rare earth magnets.

Benefits

Apart from their strong holding force, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • They have excellent resistance to weakening of magnetic properties due to opposing magnetic fields,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to present itself better,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures approaching 230°C and above...
  • Thanks to freedom in shaping and the capacity to customize to complex applications,
  • Universal use in high-tech industry – they find application in computer drives, motor assemblies, medical devices, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in creating nuts and complex shapes in magnets, we recommend using casing - magnetic mechanism.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these magnets can be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

The specified lifting capacity concerns the limit force, obtained under ideal test conditions, meaning:
  • using a sheet made of mild steel, functioning as a circuit closing element
  • whose thickness is min. 10 mm
  • with a plane free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • during detachment in a direction vertical to the plane
  • at standard ambient temperature

Determinants of lifting force in real conditions

Please note that the magnet holding will differ subject to the following factors, in order of importance:
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – insufficiently thick steel does not accept the full field, causing part of the power to be lost to the other side.
  • Metal type – different alloys reacts the same. High carbon content worsen the attraction effect.
  • Surface finish – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Thermal environment – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

H&S for magnets
Skin irritation risks

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, immediately stop working with magnets and wear gloves.

Heat sensitivity

Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.

Electronic devices

Powerful magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.

Warning for heart patients

For implant holders: Powerful magnets affect medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Powerful field

Before use, read the rules. Sudden snapping can destroy the magnet or injure your hand. Be predictive.

Magnet fragility

Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.

Precision electronics

Remember: neodymium magnets produce a field that confuses sensitive sensors. Maintain a separation from your phone, tablet, and navigation systems.

Do not drill into magnets

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Product not for children

These products are not intended for children. Swallowing several magnets may result in them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

Physical harm

Mind your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying anything in their path. Be careful!

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