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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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Technical of the product - 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

Presented values are the outcome of a physical calculation. Results were calculated on models for the class Nd2Fe14B. Real-world conditions may differ. Use these data as a supplementary guide during assembly planning.

Table 1: Static force (force 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 lbs
2970.0 g / 29.1 N
 medium risk
1 mm 2004 Gs
200.4 mT
 2.52 kg / 5.55 lbs
2519.3 g / 24.7 N
 medium risk
2 mm 1782 Gs
178.2 mT
 1.99 kg / 4.39 lbs
1993.2 g / 19.6 N
 safe
3 mm 1543 Gs
154.3 mT
 1.49 kg / 3.29 lbs
1494.0 g / 14.7 N
 safe
5 mm 1098 Gs
109.8 mT
 0.76 kg / 1.67 lbs
756.6 g / 7.4 N
 safe
10 mm 439 Gs
43.9 mT
 0.12 kg / 0.27 lbs
120.9 g / 1.2 N
 safe
15 mm 195 Gs
19.5 mT
 0.02 kg / 0.05 lbs
23.9 g / 0.2 N
 safe
20 mm 99 Gs
9.9 mT
 0.01 kg / 0.01 lbs
6.2 g / 0.1 N
 safe
30 mm 35 Gs
3.5 mT
 0.00 kg / 0.00 lbs
0.8 g / 0.0 N
 safe
50 mm 8 Gs
0.8 mT
 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
 safe
Pulling power decreases drastically with every mm of spacing. Note that even the smallest gap (e.g., dirt, paint, veneer) significantly diminishes the holding power. Neodymiums hold optimally in perfect adhesion; air break kills the force. Notice how flashily the parameters plummet, when the product does not adhere tightly to the metal substrate. When calculating the assembly, discard unnecessary gaps.

Table 2: Slippage 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
The table below defines the approximate shear load required to cause the shifting of the magnet down along a vertical steel plate (considering typical friction coefficient). This value varies with the air gap between the magnet and the metal.

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
When mounting a element on a vertical surface (e.g., a car body), it will only hold only approx. 20%-30% of its nominal power. Gravitational force as well as a low friction coefficient cause that magnets slide down faster than they detach. Designing a vertical fastening? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the element will give way down under a significantly smaller cargo. Using a rubber layer can effectively improve the result.

Table 4: Steel thickness (substrate influence) - power losses
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
A too thin steel cannot focus the entire magnetic field, which squanders power of the magnet. Should you install a neodymium to a weak sheet, the magnetism will penetrate right through and the attraction force will be weaker. To squeeze 100% of this neodymium's power, you require a sufficiently solid element of steel. The saturation effect means that on thin elements (e.g., appliance housings), the product shows lower pull force. We suggest choosing the steel thickness based on the following data.

Table 5: Thermal stability (stability) - thermal limit
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
Standard neodymium magnets lose strength after exceeding the maximum temperature. Avoid high temperatures – excessive heat can irreversibly damage this magnet. With every degree above norm, the neodymium's power momentarily drops. Avoid using this product in hot environments higher than its working range. Ignoring the limit will cause irreversible degradation of magnetism.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than long magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field range
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 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
Two strong neodymiums interact from a much further distance than a neodymium and metal setup. The connection of two magnets produces a massive flux and a further horizon of action. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a steel. Be careful that when attracting two neodymiums, the impact force is huge. 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 midpoint of the gap (caused by magnetic field nullification).
Attention: Figures show sliding force of dual same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - 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
Extremely neodym field poses a real danger to IT equipment and medical implants. These neodymiums produce a flux that destroys function of digital equipment. Remember: the invisible magnetic field penetrates the body and housings. Special caution must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, car keys, membranes, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - 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
Neodymium magnets are very brittle – a collision with steel can result in shattering. Control the attraction moment – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when working with powerful specimens.

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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

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)
Total magnetic flux passing through the magnet pole. Essential parameter for generator designers 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

*Note: On a vertical surface, the magnet holds just ~20% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.

3. Temperature resistance

*For N38 grade, 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
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%
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
Magnet Unit Converter
Force (pull)
Field Strength
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MW 5x3 / N38 - cylindrical magnet

0.283 ZŁ brutto / pcs
This product is an incredibly powerful cylinder magnet, composed of durable NdFeB material, which, at dimensions of Ø16x3 mm, guarantees maximum efficiency. The MW 16x3 / N38 component boasts high dimensional repeatability and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 2.97 kg), this product is in stock from our European logistics center, ensuring quick order fulfillment. Moreover, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient filters, where maximum induction on a small surface counts. Thanks to the high power of 29.11 N with a weight of only 4.52 g, this cylindrical magnet is indispensable in electronics and wherever every gram matters.
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 automation, specialized industrial adhesives are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø16x3), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø16x3 mm, which, at a weight of 4.52 g, makes it an element with high magnetic energy density. 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 external factors, 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 through the diameter if your project requires it.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Apart from their consistent power, neodymium magnets have these key benefits:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • Neodymium magnets are characterized by remarkably resistant to magnetic field loss caused by magnetic disturbances,
  • By applying a decorative coating of nickel, the element gains an aesthetic look,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which increases force concentration,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of detailed modeling and adjusting to defined needs,
  • Significant place in modern technologies – they serve a role in data components, electric motors, medical devices, also modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in small systems

Weaknesses

Disadvantages of neodymium magnets:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures 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 those in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in producing threads and complex forms in magnets, we recommend using cover - magnetic mount.
  • Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these magnets are able to be problematic in diagnostics medical in case of swallowing.
  • With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

The load parameter shown represents the limit force, obtained under ideal test conditions, specifically:
  • with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • characterized by smoothness
  • without any air gap between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at standard ambient temperature

Practical lifting capacity: influencing factors

In real-world applications, the actual lifting capacity results from several key aspects, listed from most significant:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
  • Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Safe distance

Device Safety: Strong magnets can damage data carriers and delicate electronics (pacemakers, hearing aids, timepieces).

GPS and phone interference

Navigation devices and smartphones are highly sensitive to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Health Danger

Patients with a ICD must keep an absolute distance from magnets. The magnetic field can stop the operation of the life-saving device.

Operating temperature

Watch the temperature. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.

Immense force

Exercise caution. Rare earth magnets act from a distance and connect with huge force, often faster than you can react.

Danger to the youngest

Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Keep away from kids and pets.

Crushing force

Danger of trauma: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Do not drill into magnets

Powder created during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Fragile material

Watch out for shards. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Avoid contact if allergic

Studies show that the nickel plating (the usual finish) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands or select coated magnets.

Attention! Need more info? Check our post: Are neodymium magnets dangerous?