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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

technical parameters »

1.734 ZŁ with VAT / pcs + price for transport

1.410 ZŁ net + 23% VAT / pcs

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Physical properties - 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

Technical simulation of the magnet - technical parameters

These data constitute the result of a mathematical calculation. Values are based on algorithms for the class Nd2Fe14B. Real-world parameters may differ from theoretical values. Treat these data as a reference point for designers.

Table 1: Static force (pull vs gap) - 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 pounds
2970.0 g / 29.1 N
 strong
1 mm 2004 Gs
200.4 mT
 2.52 kg / 5.55 pounds
2519.3 g / 24.7 N
 strong
2 mm 1782 Gs
178.2 mT
 1.99 kg / 4.39 pounds
1993.2 g / 19.6 N
 low risk
3 mm 1543 Gs
154.3 mT
 1.49 kg / 3.29 pounds
1494.0 g / 14.7 N
 low risk
5 mm 1098 Gs
109.8 mT
 0.76 kg / 1.67 pounds
756.6 g / 7.4 N
 low risk
10 mm 439 Gs
43.9 mT
 0.12 kg / 0.27 pounds
120.9 g / 1.2 N
 low risk
15 mm 195 Gs
19.5 mT
 0.02 kg / 0.05 pounds
23.9 g / 0.2 N
 low risk
20 mm 99 Gs
9.9 mT
 0.01 kg / 0.01 pounds
6.2 g / 0.1 N
 low risk
30 mm 35 Gs
3.5 mT
 0.00 kg / 0.00 pounds
0.8 g / 0.0 N
 low risk
50 mm 8 Gs
0.8 mT
 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
 low risk
Grip strength drops sharply with every mm of distance. Remember that even a very thin break (e.g., contamination, varnish, dust) significantly weakens the grip. Magnets operate optimally in perfect adhesion; gap weakens the force. See how flashily the load capacity plummet, when the magnet does not touch tightly to the steel surface. When planning the arrangement, avoid unnecessary gaps.

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.59 kg / 1.31 pounds
594.0 g / 5.8 N
1 mm Stal (~0.2) 0.50 kg / 1.11 pounds
504.0 g / 4.9 N
2 mm Stal (~0.2) 0.40 kg / 0.88 pounds
398.0 g / 3.9 N
3 mm Stal (~0.2) 0.30 kg / 0.66 pounds
298.0 g / 2.9 N
5 mm Stal (~0.2) 0.15 kg / 0.34 pounds
152.0 g / 1.5 N
10 mm Stal (~0.2) 0.02 kg / 0.05 pounds
24.0 g / 0.2 N
15 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 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
The table below presents the theoretical holding capacity required to cause the downward movement of the magnet down on a vertical metal surface (assuming typical friction coefficient). The holding force is a function of the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 pounds
891.0 g / 8.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.59 kg / 1.31 pounds
594.0 g / 5.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.30 kg / 0.65 pounds
297.0 g / 2.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.49 kg / 3.27 pounds
1485.0 g / 14.6 N
When mounting a element on a upright surface (e.g., a car body), it will maintain just about 20%-30% of its maximum pull force. Gravity and a weak degree of grip influence the fact that magnets move down faster than they pop off the substrate. Planning a hanger? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will slide down under a noticeably lighter cargo. Utilizing a rubberized layer can drastically raise the stability.

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 pounds
297.0 g / 2.9 N
1 mm
25%
 0.74 kg / 1.64 pounds
742.5 g / 7.3 N
2 mm
50%
 1.49 kg / 3.27 pounds
1485.0 g / 14.6 N
3 mm
75%
 2.23 kg / 4.91 pounds
2227.5 g / 21.9 N
5 mm
100%
 2.97 kg / 6.55 pounds
2970.0 g / 29.1 N
10 mm
100%
 2.97 kg / 6.55 pounds
2970.0 g / 29.1 N
11 mm
100%
 2.97 kg / 6.55 pounds
2970.0 g / 29.1 N
12 mm
100%
 2.97 kg / 6.55 pounds
2970.0 g / 29.1 N
A thin sheet is unable to absorb the entire magnetic field, which weakens actual performance of the holder. If you install a neodymium to a too thin substrate, the flux will penetrate right through and the pull force will drop sharply. To squeeze 100% of this neodymium's potential, you need a suitably thick backing of steel. The material oversaturation causes that on thin elements (e.g., thin profiles), the magnet holds weaker. We advise picking the steel dimension according to the table below.

Table 5: Thermal stability (material behavior) - 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 pounds
2970.0 g / 29.1 N
 OK
40 °C -2.2% 2.90 kg / 6.40 pounds
2904.7 g / 28.5 N
 OK
60 °C -4.4% 2.84 kg / 6.26 pounds
2839.3 g / 27.9 N
80 °C -6.6% 2.77 kg / 6.12 pounds
2774.0 g / 27.2 N
100 °C -28.8% 2.11 kg / 4.66 pounds
2114.6 g / 20.7 N
Classic neodymiums lose power above the temperature limit. Avoid high temperatures – excessive heat can irreversibly damage this product. As the temperature rises, the neodymium's force momentarily lowers. Refrain from using this magnet close to heaters exceeding its safe range. Too high temperature will result in permanent loss of magnetism.
*Engineering note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) are more susceptible to demagnetization sooner than long magnets. Warning indicator in the table signals permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MW 16x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 5.87 kg / 12.93 pounds
3 716 Gs
0.88 kg / 1.94 pounds
880 g / 8.6 N
 N/A
1 mm 5.46 kg / 12.03 pounds
4 197 Gs
0.82 kg / 1.80 pounds
819 g / 8.0 N
 4.91 kg / 10.83 pounds
~0 Gs
2 mm 4.98 kg / 10.97 pounds
4 007 Gs
0.75 kg / 1.65 pounds
746 g / 7.3 N
 4.48 kg / 9.87 pounds
~0 Gs
3 mm 4.46 kg / 9.83 pounds
3 794 Gs
0.67 kg / 1.48 pounds
669 g / 6.6 N
 4.01 kg / 8.85 pounds
~0 Gs
5 mm 3.43 kg / 7.56 pounds
3 326 Gs
0.51 kg / 1.13 pounds
514 g / 5.0 N
 3.09 kg / 6.80 pounds
~0 Gs
10 mm 1.49 kg / 3.30 pounds
2 196 Gs
0.22 kg / 0.49 pounds
224 g / 2.2 N
 1.35 kg / 2.97 pounds
~0 Gs
20 mm 0.24 kg / 0.53 pounds
878 Gs
0.04 kg / 0.08 pounds
36 g / 0.4 N
 0.21 kg / 0.47 pounds
~0 Gs
50 mm 0.00 kg / 0.01 pounds
113 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 / 0.00 pounds
70 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
46 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
32 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
23 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
17 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnetic products interact from a wider radius than a neodymium and metal combination. The connection of two magnets creates a more powerful interaction and a further horizon of performance. Planning to create a solid fastener? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is massive. The repulsion force is a bit weaker than the attraction, but still significant.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Attention: Figures apply to shear force of dual matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.0 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
Powerful magnet radiation is a serious hazard to electronic devices and pacemakers. These NdFeB products produce a field that disrupts operation of sensitive medical devices. Notice: the invisible magnetic field penetrates the body and glass. Special caution must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - collision effects
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
Magnetic elements are delicate – a collision with steel causes immediate chipping. Pay attention to connection velocity – a magnet released freely speeds with massive force. Striking energy can cause material chips or painful pinches to fingers. Be sure to control the product during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Corrosion resistance
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Flux)
MW 16x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 141 Mx 51.4 µWb
Pc Coefficient 0.27 Low (Flat)
Flux value emitted by the pole surface. Essential parameter when building generators as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Caution: On a vertical surface, the magnet retains merely a fraction of its nominal pull.

2. Efficiency vs thickness

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

3. Power loss vs temp

*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) = 0.27

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.

Engineering data and GPSR
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: 010033-2026
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This product is an exceptionally strong cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø16x3 mm, guarantees optimal power. This specific item is characterized by high dimensional repeatability and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 2.97 kg), this product is available off-the-shelf from our European logistics center, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building electric motors, 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 cylindrical magnet is indispensable in electronics 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., 16.1 mm) using epoxy glues. To ensure stability in industry, 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 industrial neodymium magnets, offering a great economic balance and operational stability. 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 key parameter here is the lifting capacity amounting to approximately 2.97 kg (force ~29.11 N), which, with such defined dimensions, proves the high power of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, 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 16 mm. Such an arrangement is standard 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 diametrically if your project requires it.

Pros as well as cons of rare earth magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose power, even over nearly 10 years – the reduction in lifting capacity is only ~1% (based on measurements),
  • Neodymium magnets are remarkably resistant to magnetic field loss caused by external interference,
  • In other words, due to the shiny finish of gold, the element gains visual value,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Thanks to the option of precise molding and customization to unique projects, magnetic components can be modeled in a wide range of geometric configurations, which amplifies use scope,
  • Universal use in future technologies – they find application in HDD drives, motor assemblies, diagnostic systems, and other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in miniature devices

Weaknesses

Cons of neodymium magnets: tips and applications.
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We suggest casing - magnetic mount, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which gains importance in the context of child safety. It is also worth noting that small components of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • Due to complex production process, their price is higher than average,

Lifting parameters

Detachment force of the magnet in optimal conditions – what affects it?

The lifting capacity listed is a result of laboratory testing performed under specific, ideal conditions:
  • on a base made of structural steel, perfectly concentrating the magnetic field
  • whose transverse dimension is min. 10 mm
  • characterized by smoothness
  • without any insulating layer between the magnet and steel
  • during pulling in a direction vertical to the plane
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

In real-world applications, the actual holding force is determined by a number of factors, presented from crucial:
  • Gap (between the magnet and the metal), since even a tiny clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Plate thickness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be escaped to the other side.
  • Material type – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface finish – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Lifting capacity was assessed by applying a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Precautions when working with NdFeB magnets
Do not drill into magnets

Drilling and cutting of NdFeB material carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Powerful field

Handle magnets with awareness. Their huge power can shock even professionals. Stay alert and do not underestimate their force.

Danger to pacemakers

For implant holders: Powerful magnets disrupt medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Threat to navigation

Remember: rare earth magnets generate a field that interferes with sensitive sensors. Keep a separation from your mobile, tablet, and navigation systems.

No play value

Absolutely store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are very dangerous.

Physical harm

Risk of injury: The pulling power is so immense that it can result in hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Sensitization to coating

A percentage of the population experience a contact allergy to Ni, which is the common plating for neodymium magnets. Prolonged contact may cause skin redness. We strongly advise use safety gloves.

Magnetic media

Very strong magnetic fields can destroy records on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Beware of splinters

Neodymium magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets will cause them breaking into small pieces.

Maximum temperature

Regular neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.

Warning! Looking for details? Check our post: Why are neodymium magnets dangerous?