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MW 16x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010033

GTIN/EAN: 5906301810322

5.00

Diameter Ø

16 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

4.52 g

Magnetization Direction

↑ axial

Load capacity

2.97 kg / 29.11 N

Magnetic Induction

217.61 mT / 2176 Gs

Coating

[NiCuNi] Nickel

1.734 with VAT / pcs + price for transport

1.410 ZŁ net + 23% VAT / pcs

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Detailed specification - MW 16x3 / N38 - cylindrical magnet

Specification / characteristics - MW 16x3 / N38 - cylindrical magnet

properties
properties values
Cat. no. 010033
GTIN/EAN 5906301810322
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 3 mm [±0,1 mm]
Weight 4.52 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.97 kg / 29.11 N
Magnetic Induction ~ ? 217.61 mT / 2176 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MW 16x3 / 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 product - technical parameters

The following information are the direct effect of a engineering analysis. Results were calculated on models for the material Nd2Fe14B. Actual performance may differ. Use these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - characteristics
MW 16x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2176 Gs
217.6 mT
2.97 kg / 6.55 LBS
2970.0 g / 29.1 N
warning
1 mm 2004 Gs
200.4 mT
2.52 kg / 5.55 LBS
2519.3 g / 24.7 N
warning
2 mm 1782 Gs
178.2 mT
1.99 kg / 4.39 LBS
1993.2 g / 19.6 N
low risk
3 mm 1543 Gs
154.3 mT
1.49 kg / 3.29 LBS
1494.0 g / 14.7 N
low risk
5 mm 1098 Gs
109.8 mT
0.76 kg / 1.67 LBS
756.6 g / 7.4 N
low risk
10 mm 439 Gs
43.9 mT
0.12 kg / 0.27 LBS
120.9 g / 1.2 N
low risk
15 mm 195 Gs
19.5 mT
0.02 kg / 0.05 LBS
23.9 g / 0.2 N
low risk
20 mm 99 Gs
9.9 mT
0.01 kg / 0.01 LBS
6.2 g / 0.1 N
low risk
30 mm 35 Gs
3.5 mT
0.00 kg / 0.00 LBS
0.8 g / 0.0 N
low risk
50 mm 8 Gs
0.8 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
low risk

Table 2: Shear force (wall)
MW 16x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.59 kg / 1.31 LBS
594.0 g / 5.8 N
1 mm Stal (~0.2) 0.50 kg / 1.11 LBS
504.0 g / 4.9 N
2 mm Stal (~0.2) 0.40 kg / 0.88 LBS
398.0 g / 3.9 N
3 mm Stal (~0.2) 0.30 kg / 0.66 LBS
298.0 g / 2.9 N
5 mm Stal (~0.2) 0.15 kg / 0.34 LBS
152.0 g / 1.5 N
10 mm Stal (~0.2) 0.02 kg / 0.05 LBS
24.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 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: Vertical assembly (sliding) - vertical pull
MW 16x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.89 kg / 1.96 LBS
891.0 g / 8.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.59 kg / 1.31 LBS
594.0 g / 5.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.30 kg / 0.65 LBS
297.0 g / 2.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.49 kg / 3.27 LBS
1485.0 g / 14.6 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 16x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.30 kg / 0.65 LBS
297.0 g / 2.9 N
1 mm
25%
0.74 kg / 1.64 LBS
742.5 g / 7.3 N
2 mm
50%
1.49 kg / 3.27 LBS
1485.0 g / 14.6 N
3 mm
75%
2.23 kg / 4.91 LBS
2227.5 g / 21.9 N
5 mm
100%
2.97 kg / 6.55 LBS
2970.0 g / 29.1 N
10 mm
100%
2.97 kg / 6.55 LBS
2970.0 g / 29.1 N
11 mm
100%
2.97 kg / 6.55 LBS
2970.0 g / 29.1 N
12 mm
100%
2.97 kg / 6.55 LBS
2970.0 g / 29.1 N

Table 5: Thermal resistance (stability) - resistance threshold
MW 16x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 2.97 kg / 6.55 LBS
2970.0 g / 29.1 N
OK
40 °C -2.2% 2.90 kg / 6.40 LBS
2904.7 g / 28.5 N
OK
60 °C -4.4% 2.84 kg / 6.26 LBS
2839.3 g / 27.9 N
80 °C -6.6% 2.77 kg / 6.12 LBS
2774.0 g / 27.2 N
100 °C -28.8% 2.11 kg / 4.66 LBS
2114.6 g / 20.7 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MW 16x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.87 kg / 12.93 LBS
3 716 Gs
0.88 kg / 1.94 LBS
880 g / 8.6 N
N/A
1 mm 5.46 kg / 12.03 LBS
4 197 Gs
0.82 kg / 1.80 LBS
819 g / 8.0 N
4.91 kg / 10.83 LBS
~0 Gs
2 mm 4.98 kg / 10.97 LBS
4 007 Gs
0.75 kg / 1.65 LBS
746 g / 7.3 N
4.48 kg / 9.87 LBS
~0 Gs
3 mm 4.46 kg / 9.83 LBS
3 794 Gs
0.67 kg / 1.48 LBS
669 g / 6.6 N
4.01 kg / 8.85 LBS
~0 Gs
5 mm 3.43 kg / 7.56 LBS
3 326 Gs
0.51 kg / 1.13 LBS
514 g / 5.0 N
3.09 kg / 6.80 LBS
~0 Gs
10 mm 1.49 kg / 3.30 LBS
2 196 Gs
0.22 kg / 0.49 LBS
224 g / 2.2 N
1.35 kg / 2.97 LBS
~0 Gs
20 mm 0.24 kg / 0.53 LBS
878 Gs
0.04 kg / 0.08 LBS
36 g / 0.4 N
0.21 kg / 0.47 LBS
~0 Gs
50 mm 0.00 kg / 0.01 LBS
113 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 / 0.00 LBS
70 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
46 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
32 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
23 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
17 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 16x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 5.0 cm
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.0 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 16x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 26.50 km/h
(7.36 m/s)
0.12 J
30 mm 44.78 km/h
(12.44 m/s)
0.35 J
50 mm 57.81 km/h
(16.06 m/s)
0.58 J
100 mm 81.75 km/h
(22.71 m/s)
1.17 J

Table 9: Coating parameters (durability)
MW 16x3 / 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 16x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 141 Mx 51.4 µWb
Pc Coefficient 0.27 Low (Flat)

Table 11: Underwater work (magnet fishing)
MW 16x3 / N38

Environment Effective steel pull Effect
Air (land) 2.97 kg Standard
Water (riverbed) 3.40 kg
(+0.43 kg buoyancy gain)
+14.5%
Corrosion warning: 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 retains merely ~20% of its nominal pull.

2. Steel thickness impact

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

3. Heat tolerance

*For N38 material, the critical limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.27

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 and environmental data
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%
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: 010033-2026
Measurement Calculator
Magnet pull force

Magnetic Field

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The presented product is an exceptionally strong rod magnet, manufactured from modern NdFeB material, which, with dimensions of Ø16x3 mm, guarantees the highest energy density. This specific item boasts high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a magnetic rod with significant force (approx. 2.97 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 standard operating conditions, guaranteeing an aesthetic appearance and durability for years.
This model is created for building generators, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 29.11 N with a weight of only 4.52 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. 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.
Magnets N38 are suitable for 90% of applications in automation and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø16x3), 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 16 mm and height 3 mm. The value of 29.11 N means that the magnet is capable of holding a weight many times exceeding its own mass of 4.52 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 3 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 diametrically if your project requires it.

Advantages and disadvantages of Nd2Fe14B magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (according to theory),
  • Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
  • Thanks to the metallic finish, the plating of nickel, gold, or silver-plated gives an elegant appearance,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of detailed machining and optimizing to atypical conditions,
  • Universal use in innovative solutions – they find application in computer drives, electric motors, medical equipment, and technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Limitations

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in force. 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
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in producing threads and complicated shapes in magnets, we recommend using casing - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Additionally, small components of these products can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting capacity of the magnetwhat affects it?

The declared magnet strength refers to the peak performance, recorded under ideal test conditions, namely:
  • using a base made of mild steel, acting as a magnetic yoke
  • whose thickness reaches at least 10 mm
  • characterized by lack of roughness
  • with direct contact (without impurities)
  • for force acting at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Key elements affecting lifting force

In practice, the real power depends on many variables, listed from the most important:
  • Space between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of maximum force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Steel grade – ideal substrate is high-permeability steel. Hardened steels may generate lower lifting capacity.
  • Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate reduces the lifting capacity.

Warnings
Magnetic interference

Navigation devices and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can ruin the internal compass in your phone.

Data carriers

Intense magnetic fields can destroy records on credit cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Magnet fragility

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Allergic reactions

Certain individuals experience a contact allergy to nickel, which is the standard coating for NdFeB magnets. Frequent touching can result in a rash. We suggest use protective gloves.

Dust explosion hazard

Combustion risk: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.

Do not give to children

These products are not suitable for play. Eating a few magnets can lead to them pinching intestinal walls, which poses a direct threat to life and requires urgent medical intervention.

Immense force

Handle with care. Rare earth magnets attract from a distance and connect with huge force, often faster than you can move away.

Finger safety

Risk of injury: The attraction force is so great that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Thermal limits

Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. Damage is permanent.

Implant safety

For implant holders: Strong magnetic fields disrupt electronics. Keep at least 30 cm distance or request help to handle the magnets.

Security! More info about hazards in the article: Safety of working with magnets.