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MW 29.9x10 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010052

GTIN/EAN: 5906301810513

Load capacity 21.50 kg / 210.90 N Magnetic Induction 344.60 mT / 3446 Gs
Diameter Ø
29.9 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
52.66 g
Magnetization Direction
→ diametrical
Coating
[NiCuNi] Nickel
product specifications »

24.60 zł with VAT / pcs + price for transport

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Product card - 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 analysis of the assembly - technical parameters

The following information represent the result of a physical calculation. Results are based on algorithms for the material Nd2Fe14B. Actual performance might slightly differ from theoretical values. Use these data as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - characteristics
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
 medium risk
15 mm 930 Gs
93.0 mT
 1.57 kg / 3.45 lbs
1565.8 g / 15.4 N
 weak grip
20 mm 583 Gs
58.3 mT
 0.62 kg / 1.36 lbs
616.0 g / 6.0 N
 weak grip
30 mm 258 Gs
25.8 mT
 0.12 kg / 0.27 lbs
121.0 g / 1.2 N
 weak grip
50 mm 76 Gs
7.6 mT
 0.01 kg / 0.02 lbs
10.4 g / 0.1 N
 weak grip
Grip strength drops sharply with every mm of spacing. Remember that every additional insulation layer (e.g., dirt, varnish, dust) strongly diminishes the holding power. Magnetic products operate optimally at the point of direct contact; gap nullifies the power. See how quickly the parameters plummet, when the magnet does not touch tightly to the metal substrate. When designing the arrangement, eliminate additional spacers.

Table 2: Slippage load (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
This section defines the estimated holding capacity needed to start the shifting of the magnet vertically along a upright steel plate (assuming standard friction). The holding force 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 hanging a magnet on a vertical plane (e.g., a fridge), it you can count on just about 1/5 of its nominal power. Gravity and a low friction coefficient mean that holders slide down faster than they pull off. Want to create a wall mount? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will slip down under a significantly smaller weight. Using a rubber coating can drastically improve the result.

Table 4: Material efficiency (substrate influence) - power losses
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 sheet is not enough to take in the entire magnetic field, which weakens actual performance of the magnet. Should you mount a strong magnet to a weak sheet, the field will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this neodymium's potential, you require a sufficiently solid element of metal. The saturation effect causes that on delicate walls (e.g., appliance housings), the product shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal stability (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
Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly demagnetize this product. With every degree above norm, the neodymium's power briefly drops. Do not use this product close to heaters higher than its working range. Too high temperature will cause permanent loss of magnetic properties.
*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization sooner than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field range
MW 29.9x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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 neodymium and metal combination. The connection of magnet-to-magnet generates a stronger field and a wider radius of performance. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a steel. Remember that when bringing together two magnets, the pinch force is massive. The levitation is slightly lower than the connection force, but still impressive.
*Flux density for N-N configuration drops to ~0 Gs at the midpoint between the magnets (due to field cancellation).
Attention: Calculations show shear force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (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
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
Powerful magnet radiation poses a large risk to electronics and medical implants. These magnets produce a field that destroys function of sensitive medical devices. Remember: the unseen radiation acts through matter and glass. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 23.51 km/h
(6.53 m/s)
 1.12 J
30 mm 25.61 km/h
(7.11 m/s)
 1.33 J
50 mm 25.69 km/h
(7.14 m/s)
 1.34 J
100 mm 25.70 km/h
(7.14 m/s)
 1.34 J
Magnetic elements are very brittle – a collision with steel risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can cause material chips or dangerous crushing to fingers. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the magnet. Use safety goggles when handling 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Moisture resistance is crucial for installations in bathrooms or outdoors.

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 magnet pole. Key data for generator designers and motors. Pc value defines 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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
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. Vertical hold

*Note: On a vertical surface, the magnet retains just ~20% of its nominal pull.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For N38 material, 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

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 and environmental data

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: 010052-2026
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The offered product is an incredibly powerful cylindrical magnet, made from durable NdFeB material, which, at dimensions of Ø29.9x10 mm, guarantees optimal power. The MW 29.9x10 / N38 model boasts high dimensional repeatability and industrial build quality, making it a perfect 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 warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building electric motors, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. 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 low weight is crucial.
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, 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 popular 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 (Ø29.9x10), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf 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. 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 through the diameter if your project requires it.

Strengths and weaknesses of rare earth magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their strength is durable, and after around ten years it drops only by ~1% (theoretically),
  • They do not lose their magnetic properties even under strong external field,
  • By covering with a smooth layer of silver, the element has an aesthetic look,
  • The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of precise forming and optimizing to precise requirements,
  • Significant place in electronics industry – they are utilized in mass storage devices, electromotive mechanisms, precision medical tools, also other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • 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.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in realizing threads and complicated forms in magnets, we recommend using cover - magnetic mount.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the context of child safety. Additionally, small elements of these devices are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

The specified lifting capacity refers to the peak performance, recorded under optimal environment, specifically:
  • with the contact of a yoke made of special test steel, ensuring maximum field concentration
  • with a thickness minimum 10 mm
  • characterized by lack of roughness
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at ambient temperature room level

What influences lifting capacity in practice

In real-world applications, the actual lifting capacity is determined by several key aspects, ranked from most significant:
  • Clearance – existence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Chemical composition of the base – low-carbon steel attracts best. Higher carbon content reduce magnetic permeability and holding force.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, reducing force.
  • Thermal environment – temperature increase results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet and the plate reduces the lifting capacity.

Warnings
Health Danger

Individuals with a heart stimulator should keep an absolute distance from magnets. The magnetism can interfere with the functioning of the implant.

This is not a toy

Strictly keep magnets out of reach of children. Choking hazard is high, and the effects of magnets connecting inside the body are tragic.

Nickel allergy

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If redness appears, cease handling magnets and use protective gear.

Magnet fragility

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Electronic hazard

Device Safety: Strong magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).

Phone sensors

Remember: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a separation from your mobile, device, and GPS.

Immense force

Handle with care. Neodymium magnets act from a long distance and snap with massive power, often quicker than you can react.

Demagnetization risk

Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. The loss of strength is permanent.

Machining danger

Machining of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Crushing risk

Pinching hazard: The pulling power is so great that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

Danger! Looking for details? Check our post: Are neodymium magnets dangerous?