MW 16x4 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010034
GTIN/EAN: 5906301810339
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 ZŁ with VAT / pcs + price for transport
2.76 ZŁ net + 23% VAT / pcs
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Product card - MW 16x4 / N38 - cylindrical magnet
Specification / characteristics - MW 16x4 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010034 |
| GTIN/EAN | 5906301810339 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 - data
The following information represent the direct effect of a mathematical simulation. Values are based on models for the class Nd2Fe14B. Actual conditions might slightly differ. Treat these data as a supplementary guide for designers.
Table 1: Static pull force (pull vs distance) - power drop
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
|
low risk |
| 10 mm |
542 Gs
54.2 mT
|
0.17 kg / 0.37 lbs
169.4 g / 1.7 N
|
low risk |
| 15 mm |
244 Gs
24.4 mT
|
0.03 kg / 0.08 lbs
34.2 g / 0.3 N
|
low risk |
| 20 mm |
125 Gs
12.5 mT
|
0.01 kg / 0.02 lbs
9.1 g / 0.1 N
|
low risk |
| 30 mm |
45 Gs
4.5 mT
|
0.00 kg / 0.00 lbs
1.1 g / 0.0 N
|
low risk |
| 50 mm |
11 Gs
1.1 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
low risk |
Table 2: Sliding capacity (wall)
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: Wall mounting (sliding) - behavior on slippery surfaces
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) - power losses
MW 16x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.44 kg / 0.98 lbs
443.0 g / 4.3 N
|
| 1 mm |
|
1.11 kg / 2.44 lbs
1107.5 g / 10.9 N
|
| 2 mm |
|
2.22 kg / 4.88 lbs
2215.0 g / 21.7 N
|
| 3 mm |
|
3.32 kg / 7.32 lbs
3322.5 g / 32.6 N
|
| 5 mm |
|
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
|
| 10 mm |
|
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
|
| 11 mm |
|
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
|
| 12 mm |
|
4.43 kg / 9.77 lbs
4430.0 g / 43.5 N
|
Table 5: Thermal resistance (stability) - power drop
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 range
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 (implants) - warnings
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 |
| 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 |
Table 8: Dynamics (cracking risk) - collision effects
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: Coating parameters (durability)
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 (Flux)
MW 16x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 6 192 Mx | 61.9 µWb |
| Pc Coefficient | 0.35 | Low (Flat) |
Table 11: Physics of underwater searching
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% |
1. Shear force
*Caution: On a vertical wall, the magnet holds only ~20% of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) drastically reduces the holding force.
3. Heat tolerance
*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) = 0.35
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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Pros as well as cons of Nd2Fe14B magnets.
Benefits
- They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
- Magnets effectively defend themselves against loss of magnetization caused by ambient magnetic noise,
- In other words, due to the smooth finish of silver, the element looks attractive,
- Neodymium magnets generate maximum magnetic induction on a small surface, which allows for strong attraction,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to flexibility in forming and the ability to customize to unusual requirements,
- Universal use in modern industrial fields – they are commonly used in magnetic memories, motor assemblies, diagnostic systems, and multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in miniature devices
Limitations
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
- Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- 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 as well as corrosion.
- Limited ability of creating threads in the magnet and complex forms - preferred is a housing - magnet mounting.
- Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, small components of these magnets can be problematic in diagnostics medical after entering the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities
Lifting parameters
Best holding force of the magnet in ideal parameters – what contributes to it?
- on a plate made of structural steel, effectively closing the magnetic field
- with a thickness minimum 10 mm
- with a surface free of scratches
- without the slightest air gap between the magnet and steel
- under vertical application of breakaway force (90-degree angle)
- at conditions approx. 20°C
Practical lifting capacity: influencing factors
- Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Load vector – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
- Plate material – mild steel attracts best. Alloy admixtures decrease magnetic properties and holding force.
- Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness creates an air distance.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, 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, however under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate decreases the load capacity.
Safety rules for work with NdFeB magnets
Dust is flammable
Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.
ICD Warning
Health Alert: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.
Eye protection
Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.
No play value
Only for adults. Small elements can be swallowed, causing serious injuries. Keep away from children and animals.
Protect data
Very strong magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Stay away of min. 10 cm.
Magnetic interference
Note: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, device, and navigation systems.
Allergy Warning
Nickel alert: The nickel-copper-nickel coating consists of nickel. If redness happens, cease handling magnets and wear gloves.
Bodily injuries
Big blocks can break fingers instantly. Under no circumstances put your hand between two attracting surfaces.
Respect the power
Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.
Permanent damage
Do not overheat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, inquire about HT versions (H, SH, UH).
