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Magnet fishing sets (hobbyists)

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MW 38x3.5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010062

GTIN/EAN: 5906301810612

5.00

Diameter Ø

38 mm [±0,1 mm]

Height

3.5 mm [±0,1 mm]

Weight

29.77 g

Magnetization Direction

↑ axial

Load capacity

5.09 kg / 49.91 N

Magnetic Induction

112.31 mT / 1123 Gs

Coating

[NiCuNi] Nickel

15.83 with VAT / pcs + price for transport

12.87 ZŁ net + 23% VAT / pcs

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Product card - MW 38x3.5 / N38 - cylindrical magnet

Specification / characteristics - MW 38x3.5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010062
GTIN/EAN 5906301810612
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 38 mm [±0,1 mm]
Height 3.5 mm [±0,1 mm]
Weight 29.77 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.09 kg / 49.91 N
Magnetic Induction ~ ? 112.31 mT / 1123 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 38x3.5 / 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 magnet - technical parameters

The following information are the outcome of a physical analysis. Results rely on algorithms for the material Nd2Fe14B. Operational performance might slightly differ from theoretical values. Use these data as a reference point for designers.

Table 1: Static force (pull vs distance) - characteristics
MW 38x3.5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1123 Gs
112.3 mT
5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
strong
1 mm 1103 Gs
110.3 mT
4.91 kg / 10.82 LBS
4910.1 g / 48.2 N
strong
2 mm 1075 Gs
107.5 mT
4.66 kg / 10.28 LBS
4663.0 g / 45.7 N
strong
3 mm 1040 Gs
104.0 mT
4.36 kg / 9.62 LBS
4364.2 g / 42.8 N
strong
5 mm 954 Gs
95.4 mT
3.67 kg / 8.10 LBS
3673.1 g / 36.0 N
strong
10 mm 703 Gs
70.3 mT
2.00 kg / 4.40 LBS
1997.1 g / 19.6 N
low risk
15 mm 483 Gs
48.3 mT
0.94 kg / 2.08 LBS
943.2 g / 9.3 N
low risk
20 mm 326 Gs
32.6 mT
0.43 kg / 0.95 LBS
429.7 g / 4.2 N
low risk
30 mm 155 Gs
15.5 mT
0.10 kg / 0.21 LBS
97.1 g / 1.0 N
low risk
50 mm 47 Gs
4.7 mT
0.01 kg / 0.02 LBS
8.9 g / 0.1 N
low risk

Table 2: Sliding force (vertical surface)
MW 38x3.5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.02 kg / 2.24 LBS
1018.0 g / 10.0 N
1 mm Stal (~0.2) 0.98 kg / 2.16 LBS
982.0 g / 9.6 N
2 mm Stal (~0.2) 0.93 kg / 2.05 LBS
932.0 g / 9.1 N
3 mm Stal (~0.2) 0.87 kg / 1.92 LBS
872.0 g / 8.6 N
5 mm Stal (~0.2) 0.73 kg / 1.62 LBS
734.0 g / 7.2 N
10 mm Stal (~0.2) 0.40 kg / 0.88 LBS
400.0 g / 3.9 N
15 mm Stal (~0.2) 0.19 kg / 0.41 LBS
188.0 g / 1.8 N
20 mm Stal (~0.2) 0.09 kg / 0.19 LBS
86.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 LBS
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MW 38x3.5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.53 kg / 3.37 LBS
1527.0 g / 15.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.02 kg / 2.24 LBS
1018.0 g / 10.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.51 kg / 1.12 LBS
509.0 g / 5.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.55 kg / 5.61 LBS
2545.0 g / 25.0 N

Table 4: Steel thickness (saturation) - power losses
MW 38x3.5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.51 kg / 1.12 LBS
509.0 g / 5.0 N
1 mm
25%
1.27 kg / 2.81 LBS
1272.5 g / 12.5 N
2 mm
50%
2.55 kg / 5.61 LBS
2545.0 g / 25.0 N
3 mm
75%
3.82 kg / 8.42 LBS
3817.5 g / 37.4 N
5 mm
100%
5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
10 mm
100%
5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
11 mm
100%
5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
12 mm
100%
5.09 kg / 11.22 LBS
5090.0 g / 49.9 N

Table 5: Thermal resistance (material behavior) - power drop
MW 38x3.5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.09 kg / 11.22 LBS
5090.0 g / 49.9 N
OK
40 °C -2.2% 4.98 kg / 10.97 LBS
4978.0 g / 48.8 N
OK
60 °C -4.4% 4.87 kg / 10.73 LBS
4866.0 g / 47.7 N
80 °C -6.6% 4.75 kg / 10.48 LBS
4754.1 g / 46.6 N
100 °C -28.8% 3.62 kg / 7.99 LBS
3624.1 g / 35.6 N

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MW 38x3.5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.82 kg / 19.44 LBS
2 143 Gs
1.32 kg / 2.92 LBS
1323 g / 13.0 N
N/A
1 mm 8.68 kg / 19.13 LBS
2 228 Gs
1.30 kg / 2.87 LBS
1302 g / 12.8 N
7.81 kg / 17.22 LBS
~0 Gs
2 mm 8.51 kg / 18.75 LBS
2 206 Gs
1.28 kg / 2.81 LBS
1276 g / 12.5 N
7.66 kg / 16.88 LBS
~0 Gs
3 mm 8.31 kg / 18.31 LBS
2 180 Gs
1.25 kg / 2.75 LBS
1246 g / 12.2 N
7.47 kg / 16.48 LBS
~0 Gs
5 mm 7.83 kg / 17.26 LBS
2 116 Gs
1.17 kg / 2.59 LBS
1174 g / 11.5 N
7.05 kg / 15.53 LBS
~0 Gs
10 mm 6.36 kg / 14.03 LBS
1 908 Gs
0.95 kg / 2.10 LBS
955 g / 9.4 N
5.73 kg / 12.63 LBS
~0 Gs
20 mm 3.46 kg / 7.63 LBS
1 407 Gs
0.52 kg / 1.14 LBS
519 g / 5.1 N
3.11 kg / 6.87 LBS
~0 Gs
50 mm 0.35 kg / 0.76 LBS
445 Gs
0.05 kg / 0.11 LBS
52 g / 0.5 N
0.31 kg / 0.69 LBS
~0 Gs
60 mm 0.17 kg / 0.37 LBS
310 Gs
0.03 kg / 0.06 LBS
25 g / 0.2 N
0.15 kg / 0.33 LBS
~0 Gs
70 mm 0.09 kg / 0.19 LBS
222 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
0.08 kg / 0.17 LBS
~0 Gs
80 mm 0.05 kg / 0.10 LBS
163 Gs
0.01 kg / 0.02 LBS
7 g / 0.1 N
0.04 kg / 0.09 LBS
~0 Gs
90 mm 0.03 kg / 0.06 LBS
122 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
0.02 kg / 0.05 LBS
~0 Gs
100 mm 0.02 kg / 0.03 LBS
94 Gs
0.00 kg / 0.01 LBS
2 g / 0.0 N
0.01 kg / 0.03 LBS
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MW 38x3.5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.5 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Remote 50 Gs (5.0 mT) 5.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (kinetic energy) - collision effects
MW 38x3.5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 16.10 km/h
(4.47 m/s)
0.30 J
30 mm 23.11 km/h
(6.42 m/s)
0.61 J
50 mm 29.52 km/h
(8.20 m/s)
1.00 J
100 mm 41.70 km/h
(11.58 m/s)
2.00 J

Table 9: Coating parameters (durability)
MW 38x3.5 / 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 (Flux)
MW 38x3.5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 17 022 Mx 170.2 µWb
Pc Coefficient 0.14 Low (Flat)

Table 11: Hydrostatics and buoyancy
MW 38x3.5 / N38

Environment Effective steel pull Effect
Air (land) 5.09 kg Standard
Water (riverbed) 5.83 kg
(+0.74 kg buoyancy gain)
+14.5%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds only approx. 20-30% of its max power.

2. Plate thickness effect

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

3. Thermal stability

*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) = 0.14

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
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: 010062-2025
Quick Unit Converter
Pulling force

Magnetic Induction

See also offers

The presented product is a very strong rod magnet, made from durable NdFeB material, which, at dimensions of Ø38x3.5 mm, guarantees the highest energy density. This specific item features an accuracy of ±0.1mm and professional build quality, making it a perfect solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 5.09 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Additionally, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring 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 high power of 49.91 N with a weight of only 29.77 g, this cylindrical magnet is indispensable in miniature devices 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 immediate cracking of this precision component. To ensure stability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Magnets N38 are strong enough for the majority of applications in automation and machine building, where excessive miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø38x3.5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 38 mm and height 3.5 mm. The value of 49.91 N means that the magnet is capable of holding a weight many times exceeding its own mass of 29.77 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 3.5 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 and cons of neodymium magnets.

Pros

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:
  • Their power remains stable, and after around ten years it decreases only by ~1% (theoretically),
  • They feature excellent resistance to magnetic field loss due to external fields,
  • In other words, due to the metallic finish of gold, the element is aesthetically pleasing,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
  • Due to the possibility of accurate molding and customization to individualized needs, neodymium magnets can be manufactured in a variety of geometric configurations, which makes them more universal,
  • Huge importance in advanced technology sectors – they serve a role in computer drives, brushless drives, advanced medical instruments, and industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Limitations

Drawbacks and weaknesses of neodymium magnets: tips and applications.
  • They are fragile 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 suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing nuts and complicated forms in magnets, we propose using cover - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

Maximum magnetic pulling forcewhat it depends on?

The lifting capacity listed is a result of laboratory testing conducted under the following configuration:
  • using a sheet made of low-carbon steel, acting as a circuit closing element
  • whose transverse dimension is min. 10 mm
  • with an ground contact surface
  • without any insulating layer between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Key elements affecting lifting force

During everyday use, the real power depends on many variables, ranked from most significant:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Alloy steels reduce magnetic permeability and holding force.
  • Surface finish – full contact is obtained only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the load capacity.

Warnings
Conscious usage

Use magnets with awareness. Their powerful strength can shock even professionals. Stay alert and respect their power.

Life threat

Individuals with a ICD must keep an safe separation from magnets. The magnetic field can stop the functioning of the implant.

Fragile material

Watch out for shards. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Physical harm

Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and broken bones. Protective gloves are recommended.

Choking Hazard

Absolutely keep magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are fatal.

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).

Combustion hazard

Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

Compass and GPS

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

Sensitization to coating

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction occurs, immediately stop handling magnets and wear gloves.

Magnetic media

Do not bring magnets close to a wallet, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.

Safety First! Details 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