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MW 16x4 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010034

GTIN/EAN: 5906301810339

5.00

Diameter Ø

16 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

6.03 g

Magnetization Direction

↑ axial

Load capacity

4.43 kg / 43.46 N

Magnetic Induction

277.14 mT / 2771 Gs

Coating

[NiCuNi] Nickel

3.39 with VAT / pcs + price for transport

2.76 ZŁ net + 23% VAT / pcs

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Product card - MW 16x4 / N38 - cylindrical magnet

Specification / characteristics - MW 16x4 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010034
GTIN/EAN 5906301810339
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 16 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 6.03 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.43 kg / 43.46 N
Magnetic Induction ~ ? 277.14 mT / 2771 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 16x4 / 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 simulation of the magnet - data

The following information represent the direct effect of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Actual conditions might slightly differ. Treat these data as a supplementary guide for designers.

Table 1: Static pull force (pull vs distance) - power drop
MW 16x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2771 Gs
277.1 mT
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
medium risk
1 mm 2517 Gs
251.7 mT
3.66 kg / 8.06 lbs
3656.3 g / 35.9 N
medium risk
2 mm 2216 Gs
221.6 mT
2.83 kg / 6.25 lbs
2834.9 g / 27.8 N
medium risk
3 mm 1906 Gs
190.6 mT
2.10 kg / 4.62 lbs
2096.1 g / 20.6 N
medium risk
5 mm 1348 Gs
134.8 mT
1.05 kg / 2.31 lbs
1048.6 g / 10.3 N
low risk
10 mm 542 Gs
54.2 mT
0.17 kg / 0.37 lbs
169.4 g / 1.7 N
low risk
15 mm 244 Gs
24.4 mT
0.03 kg / 0.08 lbs
34.2 g / 0.3 N
low risk
20 mm 125 Gs
12.5 mT
0.01 kg / 0.02 lbs
9.1 g / 0.1 N
low risk
30 mm 45 Gs
4.5 mT
0.00 kg / 0.00 lbs
1.1 g / 0.0 N
low risk
50 mm 11 Gs
1.1 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
low risk

Table 2: Sliding capacity (wall)
MW 16x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.89 kg / 1.95 lbs
886.0 g / 8.7 N
1 mm Stal (~0.2) 0.73 kg / 1.61 lbs
732.0 g / 7.2 N
2 mm Stal (~0.2) 0.57 kg / 1.25 lbs
566.0 g / 5.6 N
3 mm Stal (~0.2) 0.42 kg / 0.93 lbs
420.0 g / 4.1 N
5 mm Stal (~0.2) 0.21 kg / 0.46 lbs
210.0 g / 2.1 N
10 mm Stal (~0.2) 0.03 kg / 0.07 lbs
34.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 16x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.33 kg / 2.93 lbs
1329.0 g / 13.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.89 kg / 1.95 lbs
886.0 g / 8.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.44 kg / 0.98 lbs
443.0 g / 4.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.22 kg / 4.88 lbs
2215.0 g / 21.7 N

Table 4: Material efficiency (saturation) - power losses
MW 16x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.44 kg / 0.98 lbs
443.0 g / 4.3 N
1 mm
25%
1.11 kg / 2.44 lbs
1107.5 g / 10.9 N
2 mm
50%
2.22 kg / 4.88 lbs
2215.0 g / 21.7 N
3 mm
75%
3.32 kg / 7.32 lbs
3322.5 g / 32.6 N
5 mm
100%
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
10 mm
100%
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
11 mm
100%
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
12 mm
100%
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N

Table 5: Thermal resistance (stability) - power drop
MW 16x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
OK
40 °C -2.2% 4.33 kg / 9.55 lbs
4332.5 g / 42.5 N
OK
60 °C -4.4% 4.24 kg / 9.34 lbs
4235.1 g / 41.5 N
80 °C -6.6% 4.14 kg / 9.12 lbs
4137.6 g / 40.6 N
100 °C -28.8% 3.15 kg / 6.95 lbs
3154.2 g / 30.9 N

Table 6: Two magnets (repulsion) - field range
MW 16x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 9.51 kg / 20.98 lbs
4 379 Gs
1.43 kg / 3.15 lbs
1427 g / 14.0 N
N/A
1 mm 8.72 kg / 19.23 lbs
5 306 Gs
1.31 kg / 2.88 lbs
1309 g / 12.8 N
7.85 kg / 17.31 lbs
~0 Gs
2 mm 7.85 kg / 17.31 lbs
5 034 Gs
1.18 kg / 2.60 lbs
1178 g / 11.6 N
7.07 kg / 15.58 lbs
~0 Gs
3 mm 6.96 kg / 15.35 lbs
4 740 Gs
1.04 kg / 2.30 lbs
1044 g / 10.2 N
6.27 kg / 13.81 lbs
~0 Gs
5 mm 5.26 kg / 11.60 lbs
4 121 Gs
0.79 kg / 1.74 lbs
789 g / 7.7 N
4.74 kg / 10.44 lbs
~0 Gs
10 mm 2.25 kg / 4.97 lbs
2 696 Gs
0.34 kg / 0.74 lbs
338 g / 3.3 N
2.03 kg / 4.47 lbs
~0 Gs
20 mm 0.36 kg / 0.80 lbs
1 083 Gs
0.05 kg / 0.12 lbs
55 g / 0.5 N
0.33 kg / 0.72 lbs
~0 Gs
50 mm 0.01 kg / 0.01 lbs
143 Gs
0.00 kg / 0.00 lbs
1 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
60 mm 0.00 kg / 0.01 lbs
89 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
70 mm 0.00 kg / 0.00 lbs
59 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
80 mm 0.00 kg / 0.00 lbs
41 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
90 mm 0.00 kg / 0.00 lbs
29 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs
100 mm 0.00 kg / 0.00 lbs
22 Gs
0.00 kg / 0.00 lbs
0 g / 0.0 N
0.00 kg / 0.00 lbs
~0 Gs

Table 7: Protective zones (implants) - warnings
MW 16x4 / 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
Remote 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 (cracking risk) - collision effects
MW 16x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.98 km/h
(7.77 m/s)
0.18 J
30 mm 47.35 km/h
(13.15 m/s)
0.52 J
50 mm 61.12 km/h
(16.98 m/s)
0.87 J
100 mm 86.44 km/h
(24.01 m/s)
1.74 J

Table 9: Coating parameters (durability)
MW 16x4 / 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 16x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 192 Mx 61.9 µWb
Pc Coefficient 0.35 Low (Flat)

Table 11: Physics of underwater searching
MW 16x4 / N38

Environment Effective steel pull Effect
Air (land) 4.43 kg Standard
Water (riverbed) 5.07 kg
(+0.64 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. Shear force

*Caution: On a vertical wall, the magnet holds only ~20% of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

*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) = 0.35

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
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: 010034-2026
Magnet Unit Converter
Force (pull)

Magnetic Induction

Other products

The presented product is an exceptionally strong cylinder magnet, manufactured from durable NdFeB material, which, at dimensions of Ø16x4 mm, guarantees optimal power. The MW 16x4 / N38 model boasts high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with significant force (approx. 4.43 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, 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 generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 43.46 N with a weight of only 6.03 g, this cylindrical magnet is indispensable in electronics and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in industry, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are strong enough for 90% of applications in modeling and machine building, where extreme miniaturization with maximum force is not required. If you need the strongest magnets in the same volume (Ø16x4), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
This model is characterized by dimensions Ø16x4 mm, which, at a weight of 6.03 g, makes it an element with high magnetic energy density. The value of 43.46 N means that the magnet is capable of holding a weight many times exceeding its own mass of 6.03 g. The product has a [NiCuNi] coating, which protects the surface against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 4 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.

Pros as well as cons of Nd2Fe14B magnets.

Benefits

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
  • Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
  • In other words, due to the smooth finish of silver, the element looks attractive,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in forming and the ability to customize to unusual requirements,
  • Universal use in modern industrial fields – they are commonly used in magnetic memories, motor assemblies, diagnostic systems, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in miniature devices

Limitations

What to avoid - cons of neodymium magnets: tips and applications.
  • 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 raises their durability
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of creating threads in the magnet and complex forms - preferred is a housing - magnet mounting.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, small components of these magnets can be problematic in diagnostics medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Best holding force of the magnet in ideal parameterswhat contributes to it?

Holding force of 4.43 kg is a measurement result conducted under standard conditions:
  • on a plate made of structural steel, effectively closing the magnetic field
  • with a thickness minimum 10 mm
  • with a surface free of scratches
  • without the slightest air gap between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at conditions approx. 20°C

Practical lifting capacity: influencing factors

In practice, the real power is determined by many variables, ranked from most significant:
  • Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
  • Plate material – mild steel attracts best. Alloy admixtures decrease magnetic properties and holding force.
  • Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, however under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets
Dust is flammable

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

ICD Warning

Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Eye protection

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

No play value

Only for adults. Small elements can be swallowed, causing serious injuries. Keep away from children and animals.

Protect data

Very strong magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of min. 10 cm.

Magnetic interference

Note: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, device, and navigation systems.

Allergy Warning

Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness happens, cease handling magnets and wear gloves.

Bodily injuries

Big blocks can break fingers instantly. Under no circumstances put your hand between two attracting surfaces.

Respect the power

Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Permanent damage

Do not overheat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).

Caution! More info about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98