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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

see 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 product - report

Presented data represent the direct effect of a physical simulation. Values are based on models for the material Nd2Fe14B. Real-world conditions may differ. Treat these calculations as a supplementary guide for designers.

Table 1: Static pull 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 lbs
21500.0 g / 210.9 N
 critical level
1 mm 3261 Gs
326.1 mT
 19.26 kg / 42.45 lbs
19256.6 g / 188.9 N
 critical level
2 mm 3059 Gs
305.9 mT
 16.95 kg / 37.36 lbs
16947.4 g / 166.3 N
 critical level
3 mm 2848 Gs
284.8 mT
 14.70 kg / 32.40 lbs
14696.2 g / 144.2 N
 critical level
5 mm 2425 Gs
242.5 mT
 10.65 kg / 23.48 lbs
10650.1 g / 104.5 N
 critical level
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
Grip strength drops drastically with every subsequent millimeter of spacing. Remember that even a very thin break (e.g., dirt, paint, rust) noticeably reduces the pull force. Magnets hold most effectively at the point of direct contact; gap drastically cuts the force. See how flashily the load capacity drop, when the product does not adhere tightly to the metal substrate. When planning the arrangement, eliminate redundant distances.

Table 2: Vertical 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 following data defines the theoretical shear load sufficient to cause the downward movement of the magnet vertically against a vertical steel plate (assuming typical friction coefficient). This value depends on the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
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 magnet on a upright plane (e.g., a board), it you can count on barely approx. 1/5 of nominal attraction strength. Gravitational force as well as a low friction coefficient influence the fact that holders slip easier than they detach. Planning a wall mount? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a much lighter weight. Application of an anti-slip layer can drastically raise the stability.

Table 4: Steel thickness (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 too thin steel is unable to conduct the entire magnetic field, which wastes potential of the holder. If you attach a powerful product to a weak sheet, the field will penetrate right through and the pull force will drop sharply. To utilize 100% of this neodymium's power, you need a suitably thick element of metal. The saturation phenomenon causes that on sheet metal structures (e.g., thin profiles), the holder holds weaker. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - thermal limit
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 irreversibly lose parameters after exceeding the maximum temperature. Protect against heat – excessive heat can permanently destroy this product. With increasing heat, the neodymium's capacity momentarily decreases. Do not use this magnet near heat sources higher than its safe range. Ignoring the limit will result in irreversible degradation of magnetic properties.
*Technical advisory: Temperature resistance depends not only on the material grade, but also on the magnet's shape. Flat magnets (low Pc) may lose charge permanently sooner than long magnets. The danger warning in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
MW 29.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 magnetic products interact from a much further distance than a magnet and sheet setup. The connection of magnet-to-magnet produces a massive flux and a further horizon of action. Want to build a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when connecting a pair of magnets, the impact force is huge. The levitation is a bit weaker than the attraction, but still large.
*Field value in repulsion mode is approximately ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
* Estimates apply to friction force of two identical magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - warnings
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
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
Extremely neodym field is a large risk to electronic devices and medical implants. These NdFeB products produce a flux that destroys function of digital equipment. Be aware: the invisible magnetic field penetrates the body and housings. Exceptional care must be exercised by people with hearing aids and insulin pumps. Also at risk are: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - 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
Neodymium magnets are delicate – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose becomes dangerous. Striking energy can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when playing with large magnets.

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. Improper coating selection is the most common cause of magnet failure over time.

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 for generator designers as well as sensors. Pc value determines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Sliding resistance

*Note: On a vertical wall, the magnet holds only a fraction of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) drastically limits the holding force.

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

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

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

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.

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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The offered product is an incredibly powerful cylinder magnet, manufactured from advanced NdFeB material, which, at dimensions of Ø29.9x10 mm, guarantees the highest energy density. The MW 29.9x10 / N38 component boasts high dimensional repeatability and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 21.50 kg), this product is available off-the-shelf from our European logistics center, ensuring quick order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 210.90 N with a weight of only 52.66 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks immediate cracking 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 frequently chosen standard for industrial neodymium magnets, offering a great economic balance and operational stability. 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 key parameter here is the holding force amounting to approximately 21.50 kg (force ~210.90 N), which, with such defined 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.
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 most desirable 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.

Pros as well as cons of Nd2Fe14B magnets.

Pros

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • Magnets perfectly protect themselves against demagnetization caused by external fields,
  • Thanks to the metallic finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an aesthetic appearance,
  • Neodymium magnets achieve maximum magnetic induction on a contact point, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
  • Possibility of detailed forming as well as adjusting to precise applications,
  • Universal use in innovative solutions – they serve a role in HDD drives, electric drive systems, medical devices, and industrial machines.
  • Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Cons

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • 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 corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in realizing threads and complicated forms in magnets, we recommend using a housing - magnetic mechanism.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these products can complicate diagnosis medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting capacity of the magnet – what contributes to it?

The declared magnet strength refers to the limit force, measured under laboratory conditions, specifically:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • with a thickness minimum 10 mm
  • with an ground contact surface
  • without the slightest air gap between the magnet and steel
  • under vertical force direction (90-degree angle)
  • in stable room temperature

Magnet lifting force in use – key factors

Effective lifting capacity is affected by specific conditions, including (from most important):
  • Distance (betwixt the magnet and the plate), as even a very small distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface finish – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was assessed using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate reduces the holding force.

H&S for magnets
Keep away from computers

Do not bring magnets close to a wallet, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Nickel allergy

A percentage of the population have a sensitization to Ni, which is the common plating for NdFeB magnets. Prolonged contact can result in skin redness. We suggest wear protective gloves.

Heat warning

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Pacemakers

Patients with a heart stimulator should keep an safe separation from magnets. The magnetism can disrupt the functioning of the life-saving device.

Fire risk

Machining of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Crushing risk

Danger of trauma: The pulling power is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.

Swallowing risk

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

Magnet fragility

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Impact of two magnets leads to them shattering into shards.

Handling guide

Exercise caution. Rare earth magnets attract from a distance and snap with massive power, often quicker than you can move away.

Impact on smartphones

An intense magnetic field interferes with the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a smartphone to avoid breaking the sensors.

Attention! Looking for details? Read our article: Are neodymium magnets dangerous?