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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Physical properties - 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 |
Engineering simulation of the assembly - technical parameters
These values constitute the outcome of a engineering simulation. Results were calculated on models for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Treat these data as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs gap) - interaction chart
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
|
warning |
| 1 mm |
2517 Gs
251.7 mT
|
3.66 kg / 8.06 LBS
3656.3 g / 35.9 N
|
warning |
| 2 mm |
2216 Gs
221.6 mT
|
2.83 kg / 6.25 LBS
2834.9 g / 27.8 N
|
warning |
| 3 mm |
1906 Gs
190.6 mT
|
2.10 kg / 4.62 LBS
2096.1 g / 20.6 N
|
warning |
| 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: Vertical capacity (vertical surface)
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 (shearing) - 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 (substrate influence) - sheet metal selection
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: Working in heat (stability) - thermal limit
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 (attraction) - forces in the system
MW 16x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral 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: Safety (HSE) (electronics) - precautionary measures
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 |
| 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: Impact energy (cracking risk) - warning
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: Anti-corrosion coating 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: Submerged application
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. Wall mount (shear)
*Note: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) severely reduces the holding force.
3. Heat tolerance
*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) = 0.35
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.
Chemical composition
| 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 |
Other deals
Strengths as well as weaknesses of neodymium magnets.
Advantages
- They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
- Magnets perfectly defend themselves against demagnetization caused by external fields,
- Thanks to the reflective finish, the coating of nickel, gold-plated, or silver-plated gives an clean appearance,
- They are known for high magnetic induction at the operating surface, which affects their effectiveness,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Thanks to flexibility in constructing and the ability to modify to specific needs,
- Significant place in modern technologies – they serve a role in mass storage devices, brushless drives, advanced medical instruments, also multitasking production systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in small systems
Limitations
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their durability
- Neodymium magnets decrease their force 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 stability even at temperatures up to 230°C
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing nuts and complex forms in magnets, we recommend using cover - magnetic mechanism.
- Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which becomes key in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
- Due to expensive raw materials, their price is relatively high,
Pull force analysis
Best holding force of the magnet in ideal parameters – what affects it?
- using a plate made of low-carbon steel, serving as a circuit closing element
- possessing a massiveness of minimum 10 mm to avoid saturation
- characterized by lack of roughness
- without the slightest air gap between the magnet and steel
- during detachment in a direction vertical to the plane
- at room temperature
What influences lifting capacity in practice
- Air gap (betwixt the magnet and the plate), as even a very small distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Material type – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
- Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
- Thermal environment – heating the magnet results in weakening of induction. Check the thermal limit for a given model.
Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.
Safety rules for work with neodymium magnets
Magnetic media
Do not bring magnets close to a wallet, laptop, or TV. The magnetic field can irreversibly ruin these devices and erase data from cards.
Respect the power
Exercise caution. Neodymium magnets act from a distance and connect with massive power, often faster than you can react.
Combustion hazard
Mechanical processing of neodymium magnets carries a risk of fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
Permanent damage
Keep cool. NdFeB magnets are susceptible to temperature. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).
Serious injuries
Big blocks can break fingers in a fraction of a second. Never place your hand betwixt two strong magnets.
Keep away from electronics
Be aware: rare earth magnets produce a field that disrupts precision electronics. Maintain a safe distance from your phone, device, and GPS.
Nickel allergy
It is widely known that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands or choose encased magnets.
Choking Hazard
Always store magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are life-threatening.
ICD Warning
Medical warning: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.
Magnets are brittle
Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.
