MW 4x6 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010078
GTIN/EAN: 5906301810773
Diameter Ø
4 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
0.57 g
Magnetization Direction
↑ axial
Load capacity
0.41 kg / 4.06 N
Magnetic Induction
586.32 mT / 5863 Gs
Coating
[NiCuNi] Nickel
0.381 ZŁ with VAT / pcs + price for transport
0.310 ZŁ net + 23% VAT / pcs
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Detailed specification - MW 4x6 / N38 - cylindrical magnet
Specification / characteristics - MW 4x6 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010078 |
| GTIN/EAN | 5906301810773 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 4 mm [±0,1 mm] |
| Height | 6 mm [±0,1 mm] |
| Weight | 0.57 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.41 kg / 4.06 N |
| Magnetic Induction ~ ? | 586.32 mT / 5863 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 product - report
The following data constitute the outcome of a engineering calculation. Values are based on models for the material Nd2Fe14B. Real-world performance might slightly differ. Treat these calculations as a preliminary roadmap for designers.
Table 1: Static force (force vs gap) - characteristics
MW 4x6 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5852 Gs
585.2 mT
|
0.41 kg / 0.90 LBS
410.0 g / 4.0 N
|
low risk |
| 1 mm |
3189 Gs
318.9 mT
|
0.12 kg / 0.27 LBS
121.7 g / 1.2 N
|
low risk |
| 2 mm |
1631 Gs
163.1 mT
|
0.03 kg / 0.07 LBS
31.8 g / 0.3 N
|
low risk |
| 3 mm |
894 Gs
89.4 mT
|
0.01 kg / 0.02 LBS
9.6 g / 0.1 N
|
low risk |
| 5 mm |
343 Gs
34.3 mT
|
0.00 kg / 0.00 LBS
1.4 g / 0.0 N
|
low risk |
| 10 mm |
73 Gs
7.3 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
low risk |
| 15 mm |
26 Gs
2.6 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 20 mm |
13 Gs
1.3 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 30 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Vertical hold (wall)
MW 4x6 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.08 kg / 0.18 LBS
82.0 g / 0.8 N
|
| 1 mm | Stal (~0.2) |
0.02 kg / 0.05 LBS
24.0 g / 0.2 N
|
| 2 mm | Stal (~0.2) |
0.01 kg / 0.01 LBS
6.0 g / 0.1 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 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: Vertical assembly (sliding) - behavior on slippery surfaces
MW 4x6 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.12 kg / 0.27 LBS
123.0 g / 1.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.08 kg / 0.18 LBS
82.0 g / 0.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.04 kg / 0.09 LBS
41.0 g / 0.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.21 kg / 0.45 LBS
205.0 g / 2.0 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 4x6 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.04 kg / 0.09 LBS
41.0 g / 0.4 N
|
| 1 mm |
|
0.10 kg / 0.23 LBS
102.5 g / 1.0 N
|
| 2 mm |
|
0.21 kg / 0.45 LBS
205.0 g / 2.0 N
|
| 3 mm |
|
0.31 kg / 0.68 LBS
307.5 g / 3.0 N
|
| 5 mm |
|
0.41 kg / 0.90 LBS
410.0 g / 4.0 N
|
| 10 mm |
|
0.41 kg / 0.90 LBS
410.0 g / 4.0 N
|
| 11 mm |
|
0.41 kg / 0.90 LBS
410.0 g / 4.0 N
|
| 12 mm |
|
0.41 kg / 0.90 LBS
410.0 g / 4.0 N
|
Table 5: Thermal resistance (stability) - thermal limit
MW 4x6 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.41 kg / 0.90 LBS
410.0 g / 4.0 N
|
OK |
| 40 °C | -2.2% |
0.40 kg / 0.88 LBS
401.0 g / 3.9 N
|
OK |
| 60 °C | -4.4% |
0.39 kg / 0.86 LBS
392.0 g / 3.8 N
|
OK |
| 80 °C | -6.6% |
0.38 kg / 0.84 LBS
382.9 g / 3.8 N
|
|
| 100 °C | -28.8% |
0.29 kg / 0.64 LBS
291.9 g / 2.9 N
|
Table 6: Two magnets (attraction) - field range
MW 4x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
2.65 kg / 5.85 LBS
6 085 Gs
|
0.40 kg / 0.88 LBS
398 g / 3.9 N
|
N/A |
| 1 mm |
1.51 kg / 3.34 LBS
8 844 Gs
|
0.23 kg / 0.50 LBS
227 g / 2.2 N
|
1.36 kg / 3.01 LBS
~0 Gs
|
| 2 mm |
0.79 kg / 1.74 LBS
6 377 Gs
|
0.12 kg / 0.26 LBS
118 g / 1.2 N
|
0.71 kg / 1.56 LBS
~0 Gs
|
| 3 mm |
0.40 kg / 0.88 LBS
4 541 Gs
|
0.06 kg / 0.13 LBS
60 g / 0.6 N
|
0.36 kg / 0.79 LBS
~0 Gs
|
| 5 mm |
0.11 kg / 0.24 LBS
2 388 Gs
|
0.02 kg / 0.04 LBS
17 g / 0.2 N
|
0.10 kg / 0.22 LBS
~0 Gs
|
| 10 mm |
0.01 kg / 0.02 LBS
687 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 LBS
145 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
14 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 LBS
8 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
5 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
4 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
3 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
2 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MW 4x6 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 1.5 cm |
| Car key | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MW 4x6 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
27.05 km/h
(7.51 m/s)
|
0.02 J | |
| 30 mm |
46.85 km/h
(13.01 m/s)
|
0.05 J | |
| 50 mm |
60.48 km/h
(16.80 m/s)
|
0.08 J | |
| 100 mm |
85.53 km/h
(23.76 m/s)
|
0.16 J |
Table 9: Coating parameters (durability)
MW 4x6 / 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 4x6 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 792 Mx | 7.9 µWb |
| Pc Coefficient | 1.09 | High (Stable) |
Table 11: Physics of underwater searching
MW 4x6 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.41 kg | Standard |
| Water (riverbed) |
0.47 kg
(+0.06 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical wall, the magnet retains just ~20% of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Heat tolerance
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.09
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.
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 |
Other products
Advantages and disadvantages of rare earth magnets.
Pros
- Their magnetic field remains stable, and after around 10 years it decreases only by ~1% (according to research),
- They do not lose their magnetic properties even under external field action,
- The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to look better,
- They are known for high magnetic induction at the operating surface, which increases their power,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Thanks to modularity in shaping and the capacity to customize to specific needs,
- Versatile presence in future technologies – they find application in HDD drives, electromotive mechanisms, medical equipment, and technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in miniature devices
Cons
- Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- They rust 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 shapes in magnets, we recommend using casing - magnetic holder.
- Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these devices can disrupt the diagnostic process medical when they are in the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Highest magnetic holding force – what affects it?
- using a sheet made of mild steel, serving as a circuit closing element
- whose thickness is min. 10 mm
- characterized by smoothness
- under conditions of ideal adhesion (surface-to-surface)
- under perpendicular application of breakaway force (90-degree angle)
- at conditions approx. 20°C
Lifting capacity in practice – influencing factors
- Distance (between the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
- Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
- Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
- Steel type – mild steel gives the best results. Higher carbon content lower magnetic permeability and lifting capacity.
- Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
- Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.
Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.
H&S for magnets
Heat sensitivity
Do not overheat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).
Pinching danger
Danger of trauma: The attraction force is so immense that it can result in blood blisters, crushing, and broken bones. Use thick gloves.
Dust explosion hazard
Mechanical processing of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Magnetic media
Intense magnetic fields can corrupt files on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.
Respect the power
Handle magnets with awareness. Their immense force can surprise even experienced users. Stay alert and respect their force.
Keep away from electronics
Remember: neodymium magnets produce a field that confuses precision electronics. Maintain a safe distance from your phone, tablet, and navigation systems.
Swallowing risk
Absolutely store magnets out of reach of children. Ingestion danger is high, and the effects of magnets clamping inside the body are very dangerous.
Material brittleness
Watch out for shards. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.
Pacemakers
Life threat: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.
Nickel coating and allergies
Nickel alert: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.
