MW 16x3 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010033
GTIN/EAN: 5906301810322
- 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
1.410 zł net / pcs
1.734 zł with VAT (23% VAT) / pcs
bulk discounts:
Need more?Frequently asked questions
What is the maximum working temperature of a disc magnet?
What is the difference between N38, N42 and N52?
What is the dimensional tolerance?
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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Technical specification - MW 16x3 / N38 - cylindrical magnet
Specification / characteristics - MW 16x3 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010033 |
| GTIN/EAN | 5906301810322 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 |
|
0.30 kg / 0.65 lbs
297.0 g / 2.9 N
|
| 1 mm |
|
0.74 kg / 1.64 lbs
742.5 g / 7.3 N
|
| 2 mm |
|
1.49 kg / 3.27 lbs
1485.0 g / 14.6 N
|
| 3 mm |
|
2.23 kg / 4.91 lbs
2227.5 g / 21.9 N
|
| 5 mm |
|
2.97 kg / 6.55 lbs
2970.0 g / 29.1 N
|
| 10 mm |
|
2.97 kg / 6.55 lbs
2970.0 g / 29.1 N
|
| 11 mm |
|
2.97 kg / 6.55 lbs
2970.0 g / 29.1 N
|
| 12 mm |
|
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% |
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.
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 |
Other offers
Strengths as well as weaknesses of neodymium magnets.
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
- 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 parameters – what contributes to it?
- 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
- 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.
