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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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Technical details - 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

Physical simulation of the product - technical parameters

These data constitute the direct effect of a mathematical calculation. Values are based on models for the class Nd2Fe14B. Operational parameters may deviate from the simulation results. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - characteristics
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
safe
10 mm 542 Gs
54.2 mT
0.17 kg / 0.37 lbs
169.4 g / 1.7 N
safe
15 mm 244 Gs
24.4 mT
0.03 kg / 0.08 lbs
34.2 g / 0.3 N
safe
20 mm 125 Gs
12.5 mT
0.01 kg / 0.02 lbs
9.1 g / 0.1 N
safe
30 mm 45 Gs
4.5 mT
0.00 kg / 0.00 lbs
1.1 g / 0.0 N
safe
50 mm 11 Gs
1.1 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
safe

Table 2: Shear force (vertical surface)
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: Vertical assembly (shearing) - vertical pull
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) - sheet metal selection
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 stability (material behavior) - thermal limit
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 collision
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 (electronics) - precautionary measures
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
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 (cracking risk) - warning
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: Surface protection spec
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 (Pc)
MW 16x4 / N38

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

Table 11: Underwater work (magnet fishing)
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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely 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) = 0.35

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
Chemical composition
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: 010034-2026
Quick Unit Converter
Pulling force

Magnetic Field

View also products

The presented product is an extremely powerful rod magnet, composed of durable NdFeB material, which, at dimensions of Ø16x4 mm, guarantees the highest energy density. This specific item boasts an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 4.43 kg), this product is in stock from our European logistics center, ensuring lightning-fast order fulfillment. Moreover, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect 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 rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering an optimal price-to-power ratio and operational stability. 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 available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 16 mm and height 4 mm. 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 cylinder 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 diametrically if your project requires it.

Pros and cons of neodymium magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even over nearly ten years – the reduction in power is only ~1% (based on measurements),
  • They retain their magnetic properties even under strong external field,
  • By using a lustrous layer of gold, the element presents an proper look,
  • They show high magnetic induction at the operating surface, which increases their power,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to modularity in forming and the capacity to modify to unusual requirements,
  • Versatile presence in modern technologies – they serve a role in mass storage devices, motor assemblies, diagnostic systems, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in small systems

Cons

Cons of neodymium magnets and ways of using them
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making nuts in the magnet and complex shapes - preferred is cover - magnet mounting.
  • Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Lifting parameters

Highest magnetic holding forcewhat affects it?

The declared magnet strength concerns the limit force, obtained under ideal test conditions, meaning:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • with a thickness minimum 10 mm
  • with an ideally smooth touching surface
  • with direct contact (no impurities)
  • during pulling in a direction vertical to the mounting surface
  • at conditions approx. 20°C

Practical aspects of lifting capacity – factors

Effective lifting capacity is influenced by specific conditions, such as (from most important):
  • Air gap (betwixt the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, corrosion or debris).
  • Angle of force application – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, 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, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Implant safety

People with a pacemaker must keep an safe separation from magnets. The magnetic field can disrupt the functioning of the life-saving device.

Nickel allergy

It is widely known that nickel (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands and choose coated magnets.

Powerful field

Handle magnets consciously. Their huge power can shock even professionals. Plan your moves and do not underestimate their power.

Protect data

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

Heat warning

Keep cool. NdFeB magnets are susceptible to temperature. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Serious injuries

Big blocks can smash fingers instantly. Do not place your hand between two strong magnets.

Compass and GPS

A powerful magnetic field negatively affects the functioning of compasses in phones and navigation systems. Maintain magnets close to a device to avoid damaging the sensors.

Flammability

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Magnets are brittle

Despite the nickel coating, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Do not give to children

Always keep magnets out of reach of children. Choking hazard is significant, and the effects of magnets clamping inside the body are life-threatening.

Caution! Looking for details? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98