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MW 16x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010033

GTIN/EAN: 5906301810322

5.00
Load capacity 2.97 kg / 29.11 N Magnetic Induction 217.61 mT / 2176 Gs
Diameter Ø
16 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
4.52 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

1.410net / pcs

1.734 zł with VAT (23% VAT) / pcs

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Net
Gross
price from 1 pcs
1.410 zł
1.734 zł
price from 450 pcs
1.325 zł
1.630 zł
price from 1800 pcs
1.241 zł
1.526 zł

Frequently asked questions

What is the maximum working temperature of a disc magnet?
Standard N-series grades work up to 80 °C. Grades N50, N52 and N54 have a lower limit of 60 °C, because coercivity falls as BHmax rises. Higher temperatures require the H (120 °C), SH (150 °C), UH (180 °C), EH (200 °C) or AH (230 °C) series. Within the working range the magnet loses about 0.11% of its induction per degree, and that loss is reversible.
What is the difference between N38, N42 and N52?
The number after N is the energy product BHmax. Moving from N38 to N52 raises it by several tens of percent, but the real holding force increases by roughly 20%, because force also depends on geometry and on the magnetic circuit. N52 costs about twice as much as N42, so for most mounting work N38–N42 is the best price-to-force ratio.
What is the dimensional tolerance?
±0.1 mm as standard, ±0.05 mm to order. The tolerance is stated next to the dimensions on every product page.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working 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 310 °C
Curie Temperature TF 590 °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 - data

These information are the direct effect of a engineering simulation. Results were calculated on models for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Use these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs gap) - interaction chart
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
strong
1 mm 2004 Gs
200.4 mT
2.52 kg / 5.55 lbs
2519.3 g / 24.7 N
strong
2 mm 1782 Gs
178.2 mT
1.99 kg / 4.39 lbs
1993.2 g / 19.6 N
weak grip
3 mm 1543 Gs
154.3 mT
1.49 kg / 3.29 lbs
1494.0 g / 14.7 N
weak grip
5 mm 1098 Gs
109.8 mT
0.76 kg / 1.67 lbs
756.6 g / 7.4 N
weak grip
10 mm 439 Gs
43.9 mT
0.12 kg / 0.27 lbs
120.9 g / 1.2 N
weak grip
15 mm 195 Gs
19.5 mT
0.02 kg / 0.05 lbs
23.9 g / 0.2 N
weak grip
20 mm 99 Gs
9.9 mT
0.01 kg / 0.01 lbs
6.2 g / 0.1 N
weak grip
30 mm 35 Gs
3.5 mT
0.00 kg / 0.00 lbs
0.8 g / 0.0 N
weak grip
50 mm 8 Gs
0.8 mT
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
weak grip

Table 2: Shear capacity (vertical surface)
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: Wall mounting (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: Material efficiency (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 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

Table 6: Two magnets (repulsion) - 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

Table 7: Safety (HSE) (electronics) - 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
Phone / Smartphone 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 24.50 km/h
(6.80 m/s)
0.10 J
30 mm 24.93 km/h
(6.92 m/s)
0.11 J
50 mm 24.93 km/h
(6.93 m/s)
0.11 J
100 mm 24.94 km/h
(6.93 m/s)
0.11 J

Table 9: Anti-corrosion coating 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 (Pc)
MW 16x3 / N38

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

Table 11: Physics of underwater searching
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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds merely a fraction of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.

3. Temperature resistance

*For standard magnets, 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

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 specification and ecology

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
Quick Unit Converter

Force (pull)


Magnetic Induction

Other offers

The offered product is an exceptionally strong rod magnet, produced from durable NdFeB material, which, at dimensions of Ø16x3 mm, guarantees maximum efficiency. The MW 16x3 / N38 model features an accuracy of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a cylindrical magnet with significant force (approx. 2.97 kg), this product is in stock from our warehouse in Poland, ensuring quick order fulfillment. Moreover, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 29.11 N with a weight of only 4.52 g, this cylindrical magnet is indispensable in miniature devices and wherever low weight is crucial.
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, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Magnets NdFeB grade N38 are suitable 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 (Ø16x3), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale 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.
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 through the diameter if your project requires it.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • Their strength is maintained, and after approximately 10 years it decreases only by ~1% (theoretically),
  • They show high resistance to demagnetization induced by external disturbances,
  • Thanks to the shiny finish, the coating of nickel, gold-plated, or silver-plated gives an aesthetic appearance,
  • Magnets have maximum magnetic induction on the active area,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to versatility in constructing and the ability to adapt to specific needs,
  • Versatile presence in advanced technology sectors – they are utilized in hard drives, motor assemblies, medical equipment, as well as modern systems.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Weaknesses

Characteristics of disadvantages of neodymium magnets: tips and applications.
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets start to rust. For applications 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 realizing threads and complicated shapes in magnets, we recommend using cover - magnetic mount.
  • Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these devices can complicate diagnosis medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Holding force characteristics

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

Magnet power was determined for ideal contact conditions, including:
  • using a sheet made of high-permeability steel, acting as a ideal flux conductor
  • possessing a thickness of minimum 10 mm to avoid saturation
  • characterized by lack of roughness
  • with direct contact (without paint)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature room level

Practical lifting capacity: influencing factors

It is worth knowing that the application force may be lower subject to elements below, in order of importance:
  • Distance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. High carbon content worsen the attraction effect.
  • Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
  • Thermal factor – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the holding force.

Warnings
Magnets are brittle

NdFeB magnets are sintered ceramics, which means they are very brittle. Clashing of two magnets will cause them cracking into shards.

Powerful field

Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Danger to the youngest

Always keep magnets out of reach of children. Ingestion danger is high, and the effects of magnets connecting inside the body are fatal.

Serious injuries

Mind your fingers. Two large magnets will join immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Thermal limits

Monitor thermal conditions. Heating the magnet to high heat will ruin its properties and strength.

Electronic hazard

Avoid bringing magnets near a purse, laptop, or TV. The magnetic field can destroy these devices and erase data from cards.

Nickel coating and allergies

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness happens, immediately stop working with magnets and use protective gear.

Flammability

Drilling and cutting of neodymium magnets poses a fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Threat to navigation

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can ruin the internal compass in your phone.

Health Danger

Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.

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