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Start your adventure involving underwater treasure hunting! Our double-handle grips (F200, F400) provide grip certainty and huge lifting capacity. Solid, corrosion-resistant housing and reinforced ropes are reliable in any water.

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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

24.60 with VAT / pcs + price for transport

20.00 ZŁ net + 23% VAT / pcs

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Detailed 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

Engineering modeling of the assembly - data

These data represent the result of a engineering simulation. Results rely on models for the material Nd2Fe14B. Actual parameters might slightly differ. Please consider these calculations as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs gap) - 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
low risk
20 mm 583 Gs
58.3 mT
0.62 kg / 1.36 lbs
616.0 g / 6.0 N
low risk
30 mm 258 Gs
25.8 mT
0.12 kg / 0.27 lbs
121.0 g / 1.2 N
low risk
50 mm 76 Gs
7.6 mT
0.01 kg / 0.02 lbs
10.4 g / 0.1 N
low risk

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

Table 3: Vertical assembly (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 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

Table 4: Steel thickness (saturation) - 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

Table 5: Thermal stability (material behavior) - 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

Table 6: Magnet-Magnet interaction (attraction) - field range
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

Table 7: Hazards (electronics) - 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
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

Table 8: Collisions (kinetic energy) - 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

Table 9: Anti-corrosion coating 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)

Table 10: Construction 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)

Table 11: Hydrostatics and buoyancy
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.
1. Sliding resistance

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

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Power loss vs temp

*For N38 grade, 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 specification and ecology
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%
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
Magnet Unit Converter
Pulling force

Field Strength

See also deals

The offered product is an incredibly powerful cylindrical magnet, composed of durable NdFeB material, which, at dimensions of Ø29.9x10 mm, guarantees optimal power. This specific item boasts an accuracy 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 available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in typical 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 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 electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in industry, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. 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 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.
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 29.9 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 rare earth magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • Their strength is maintained, and after approximately 10 years it drops only by ~1% (according to research),
  • Magnets effectively defend themselves against demagnetization caused by foreign field sources,
  • By applying a lustrous layer of silver, the element presents an nice look,
  • Neodymium magnets achieve maximum magnetic induction on a contact point, which increases force concentration,
  • Neodymium magnets are characterized by extremely 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 freedom in shaping and the capacity to customize to individual projects,
  • Significant place in modern industrial fields – they are used in computer drives, brushless drives, precision medical tools, and modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making nuts in the magnet and complicated shapes - preferred is cover - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these devices are able to complicate diagnosis medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding forcewhat contributes to it?

Information about lifting capacity was determined for optimal configuration, including:
  • using a plate made of high-permeability steel, serving as a magnetic yoke
  • whose thickness equals approx. 10 mm
  • with an polished touching surface
  • with total lack of distance (without coatings)
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Determinants of lifting force in real conditions

During everyday use, the actual lifting capacity is determined by several key aspects, ranked from most significant:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Angle of force application – highest force is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Higher carbon content lower magnetic permeability and lifting capacity.
  • Base smoothness – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets
Powerful field

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

GPS Danger

Remember: neodymium magnets produce a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.

Data carriers

Avoid bringing magnets near a purse, laptop, or screen. The magnetic field can destroy these devices and wipe information from cards.

Physical harm

Big blocks can smash fingers in a fraction of a second. Under no circumstances put your hand between two attracting surfaces.

Thermal limits

Control the heat. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Skin irritation risks

It is widely known that nickel (the usual finish) is a potent allergen. For allergy sufferers, avoid touching magnets with bare hands or select coated magnets.

Dust explosion hazard

Powder produced during machining of magnets is combustible. Do not drill into magnets unless you are an expert.

Keep away from children

Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are very dangerous.

Medical implants

Patients with a heart stimulator have to keep an large gap from magnets. The magnetism can stop the operation of the implant.

Protective goggles

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Attention! More info about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98