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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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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

Technical analysis of the magnet - technical parameters

Presented values are the direct effect of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Operational performance might slightly differ. Treat these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - 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
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
medium risk
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

Table 2: Sliding 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 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 (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

Table 4: Steel thickness (saturation) - 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

Table 5: Thermal stability (material behavior) - 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

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

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
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: Impact energy (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: 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)

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)

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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

*Warning: On a vertical wall, the magnet holds merely ~20% of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*For N38 grade, the critical limit 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 specification and ecology
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%
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

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The offered product is an exceptionally strong cylindrical magnet, produced from modern NdFeB material, which, at dimensions of Ø29.9x10 mm, guarantees optimal power. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 21.50 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building electric motors, advanced Hall effect sensors, and efficient filters, where maximum induction on a small surface counts. 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 every gram matters.
Since our magnets have a very precise dimensions, 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 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 a great economic balance 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 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 grade of the NdFeB material. The product has a [NiCuNi] coating, which protects the surface against oxidation, 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. 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.

Advantages and disadvantages of Nd2Fe14B magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They have stable power, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to magnetism drop as a result of opposing magnetic fields,
  • The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to present itself better,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
  • Possibility of precise machining and optimizing to precise needs,
  • Key role in advanced technology sectors – they are used in magnetic memories, electric motors, diagnostic systems, and modern systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Drawbacks and weaknesses of neodymium magnets: application proposals
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We recommend casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Potential hazard related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these devices can complicate diagnosis medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is a challenge,

Holding force characteristics

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

The force parameter is a theoretical maximum value conducted under standard conditions:
  • with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • characterized by smoothness
  • with direct contact (without coatings)
  • under perpendicular force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Determinants of practical lifting force of a magnet

In real-world applications, the actual lifting capacity depends on several key aspects, presented from the most important:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Material type – the best choice is pure iron steel. Cast iron may attract less.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Thermal factor – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a slight gap between the magnet and the plate reduces the load capacity.

Safety rules for work with neodymium magnets
Allergy Warning

Studies show that nickel (standard magnet coating) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands or opt for versions in plastic housing.

Conscious usage

Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.

Keep away from children

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

Health Danger

Individuals with a pacemaker have to maintain an safe separation from magnets. The magnetic field can stop the functioning of the implant.

Magnets are brittle

Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Bone fractures

Large magnets can break fingers instantly. Never place your hand betwixt two strong magnets.

Keep away from computers

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

Thermal limits

Keep cool. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Do not drill into magnets

Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Magnetic interference

A strong magnetic field disrupts the functioning of compasses in phones and GPS navigation. Maintain magnets near a device to prevent breaking the sensors.

Caution! Learn more about risks in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98