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Magnet fishing: solid F200/F400 sets

Begin your hobby with treasure salvaging! Our double-handle grips (F200, F400) provide grip certainty and huge lifting capacity. Stainless steel construction and reinforced ropes will perform in challenging water conditions.

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Professional threaded grips

Proven solutions for fixing non-invasive. Threaded mounts (M8, M10, M12) provide quick improvement of work on production halls. Perfect for installing lighting, detectors and banners.

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MW 15x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010031

GTIN/EAN: 5906301810308

5.00

Diameter Ø

15 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

6.63 g

Magnetization Direction

↑ axial

Load capacity

5.39 kg / 52.83 N

Magnetic Induction

343.70 mT / 3437 Gs

Coating

[NiCuNi] Nickel

3.20 with VAT / pcs + price for transport

2.60 ZŁ net + 23% VAT / pcs

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Technical - MW 15x5 / N38 - cylindrical magnet

Specification / characteristics - MW 15x5 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010031
GTIN/EAN 5906301810308
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 15 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 6.63 g
Magnetization Direction ↑ axial
Load capacity ~ ? 5.39 kg / 52.83 N
Magnetic Induction ~ ? 343.70 mT / 3437 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 15x5 / 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

The following information constitute the result of a mathematical analysis. Results were calculated on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ. Use these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MW 15x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3436 Gs
343.6 mT
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
strong
1 mm 3054 Gs
305.4 mT
4.26 kg / 9.39 pounds
4258.2 g / 41.8 N
strong
2 mm 2633 Gs
263.3 mT
3.17 kg / 6.98 pounds
3165.4 g / 31.1 N
strong
3 mm 2221 Gs
222.1 mT
2.25 kg / 4.96 pounds
2251.5 g / 22.1 N
strong
5 mm 1521 Gs
152.1 mT
1.06 kg / 2.33 pounds
1056.2 g / 10.4 N
weak grip
10 mm 585 Gs
58.5 mT
0.16 kg / 0.35 pounds
156.5 g / 1.5 N
weak grip
15 mm 260 Gs
26.0 mT
0.03 kg / 0.07 pounds
30.8 g / 0.3 N
weak grip
20 mm 133 Gs
13.3 mT
0.01 kg / 0.02 pounds
8.1 g / 0.1 N
weak grip
30 mm 47 Gs
4.7 mT
0.00 kg / 0.00 pounds
1.0 g / 0.0 N
weak grip
50 mm 12 Gs
1.2 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
weak grip

Table 2: Shear force (wall)
MW 15x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.08 kg / 2.38 pounds
1078.0 g / 10.6 N
1 mm Stal (~0.2) 0.85 kg / 1.88 pounds
852.0 g / 8.4 N
2 mm Stal (~0.2) 0.63 kg / 1.40 pounds
634.0 g / 6.2 N
3 mm Stal (~0.2) 0.45 kg / 0.99 pounds
450.0 g / 4.4 N
5 mm Stal (~0.2) 0.21 kg / 0.47 pounds
212.0 g / 2.1 N
10 mm Stal (~0.2) 0.03 kg / 0.07 pounds
32.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Wall mounting (shearing) - vertical pull
MW 15x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.62 kg / 3.56 pounds
1617.0 g / 15.9 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.08 kg / 2.38 pounds
1078.0 g / 10.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.54 kg / 1.19 pounds
539.0 g / 5.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.70 kg / 5.94 pounds
2695.0 g / 26.4 N

Table 4: Material efficiency (saturation) - power losses
MW 15x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.54 kg / 1.19 pounds
539.0 g / 5.3 N
1 mm
25%
1.35 kg / 2.97 pounds
1347.5 g / 13.2 N
2 mm
50%
2.70 kg / 5.94 pounds
2695.0 g / 26.4 N
3 mm
75%
4.04 kg / 8.91 pounds
4042.5 g / 39.7 N
5 mm
100%
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
10 mm
100%
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
11 mm
100%
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
12 mm
100%
5.39 kg / 11.88 pounds
5390.0 g / 52.9 N

Table 5: Thermal stability (material behavior) - power drop
MW 15x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 5.39 kg / 11.88 pounds
5390.0 g / 52.9 N
OK
40 °C -2.2% 5.27 kg / 11.62 pounds
5271.4 g / 51.7 N
OK
60 °C -4.4% 5.15 kg / 11.36 pounds
5152.8 g / 50.5 N
80 °C -6.6% 5.03 kg / 11.10 pounds
5034.3 g / 49.4 N
100 °C -28.8% 3.84 kg / 8.46 pounds
3837.7 g / 37.6 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 15x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 12.86 kg / 28.35 pounds
4 954 Gs
1.93 kg / 4.25 pounds
1929 g / 18.9 N
N/A
1 mm 11.54 kg / 25.43 pounds
6 508 Gs
1.73 kg / 3.81 pounds
1730 g / 17.0 N
10.38 kg / 22.89 pounds
~0 Gs
2 mm 10.16 kg / 22.40 pounds
6 107 Gs
1.52 kg / 3.36 pounds
1524 g / 14.9 N
9.14 kg / 20.16 pounds
~0 Gs
3 mm 8.82 kg / 19.44 pounds
5 689 Gs
1.32 kg / 2.92 pounds
1322 g / 13.0 N
7.93 kg / 17.49 pounds
~0 Gs
5 mm 6.40 kg / 14.11 pounds
4 847 Gs
0.96 kg / 2.12 pounds
960 g / 9.4 N
5.76 kg / 12.70 pounds
~0 Gs
10 mm 2.52 kg / 5.56 pounds
3 042 Gs
0.38 kg / 0.83 pounds
378 g / 3.7 N
2.27 kg / 5.00 pounds
~0 Gs
20 mm 0.37 kg / 0.82 pounds
1 171 Gs
0.06 kg / 0.12 pounds
56 g / 0.5 N
0.34 kg / 0.74 pounds
~0 Gs
50 mm 0.01 kg / 0.01 pounds
153 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.01 pounds
95 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
63 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
44 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
32 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
23 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Hazards (electronics) - warnings
MW 15x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Mechanical watch 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Dynamics (kinetic energy) - warning
MW 15x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.27 km/h
(8.13 m/s)
0.22 J
30 mm 49.81 km/h
(13.84 m/s)
0.63 J
50 mm 64.30 km/h
(17.86 m/s)
1.06 J
100 mm 90.93 km/h
(25.26 m/s)
2.12 J

Table 9: Surface protection spec
MW 15x5 / 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 (Pc)
MW 15x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 428 Mx 64.3 µWb
Pc Coefficient 0.44 Low (Flat)

Table 11: Underwater work (magnet fishing)
MW 15x5 / N38

Environment Effective steel pull Effect
Air (land) 5.39 kg Standard
Water (riverbed) 6.17 kg
(+0.78 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.
1. Shear force

*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Thermal stability

*For standard magnets, 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

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.

Engineering data and GPSR
Elemental analysis
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: 010031-2026
Measurement Calculator
Magnet pull force

Magnetic Induction

Other offers

This product is a very strong cylinder magnet, composed of durable NdFeB material, which, with dimensions of Ø15x5 mm, guarantees the highest energy density. This specific item is characterized by a tolerance of ±0.1mm and professional build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 5.39 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in modeling, advanced robotics, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 52.83 N with a weight of only 6.63 g, this cylindrical magnet is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a very precise dimensions, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 15.1 mm) using epoxy glues. To ensure long-term durability in automation, 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 industrial neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø15x5), 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 15 mm and height 5 mm. The value of 52.83 N means that the magnet is capable of holding a weight many times exceeding its own mass of 6.63 g. The product has a [NiCuNi] coating, which secures it 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 15 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.

Pros as well as cons of neodymium magnets.

Advantages

Apart from their superior magnetic energy, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
  • They maintain their magnetic properties even under external field action,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a maximum magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of accurate forming as well as modifying to defined conditions,
  • Huge importance in modern technologies – they find application in computer drives, electric motors, precision medical tools, also complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their 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.
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complicated shapes in magnets, we recommend using casing - magnetic mount.
  • Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small components of these products are able to complicate diagnosis medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting capacity of the magnetwhat it depends on?

Breakaway force is the result of a measurement for ideal contact conditions, including:
  • with the use of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with an polished touching surface
  • without any air gap between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at room temperature

Practical aspects of lifting capacity – factors

Bear in mind that the magnet holding will differ subject to the following factors, in order of importance:
  • Air gap (betwixt the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces weaken the grip.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets
Machining danger

Powder created during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Shattering risk

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

Safe distance

Very strong magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Phone sensors

An intense magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Keep magnets near a smartphone to prevent breaking the sensors.

Danger to pacemakers

Patients with a pacemaker must keep an large gap from magnets. The magnetic field can stop the operation of the implant.

Do not overheat magnets

Do not overheat. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Pinching danger

Big blocks can break fingers in a fraction of a second. Never place your hand between two attracting surfaces.

Handling guide

Use magnets with awareness. Their immense force can surprise even experienced users. Be vigilant and do not underestimate their power.

Do not give to children

Always keep magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are fatal.

Avoid contact if allergic

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If redness occurs, cease working with magnets and use protective gear.

Important! Want to know more? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98