MW 8x10 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010504
GTIN/EAN: 5906301814993
Diameter Ø
8 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
3.77 g
Magnetization Direction
↑ axial
Load capacity
1.84 kg / 18.00 N
Magnetic Induction
574.74 mT / 5747 Gs
Coating
[NiCuNi] Nickel
1.501 ZŁ with VAT / pcs + price for transport
1.220 ZŁ net + 23% VAT / pcs
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Technical - MW 8x10 / N38 - cylindrical magnet
Specification / characteristics - MW 8x10 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010504 |
| GTIN/EAN | 5906301814993 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 3.77 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.84 kg / 18.00 N |
| Magnetic Induction ~ ? | 574.74 mT / 5747 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 analysis of the product - data
The following data are the result of a engineering simulation. Values rely on models for the material Nd2Fe14B. Actual performance might slightly differ. Please consider these data as a supplementary guide for designers.
Table 1: Static force (pull vs distance) - power drop
MW 8x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5742 Gs
574.2 mT
|
1.84 kg / 4.06 pounds
1840.0 g / 18.1 N
|
low risk |
| 1 mm |
4323 Gs
432.3 mT
|
1.04 kg / 2.30 pounds
1043.0 g / 10.2 N
|
low risk |
| 2 mm |
3109 Gs
310.9 mT
|
0.54 kg / 1.19 pounds
539.5 g / 5.3 N
|
low risk |
| 3 mm |
2206 Gs
220.6 mT
|
0.27 kg / 0.60 pounds
271.6 g / 2.7 N
|
low risk |
| 5 mm |
1149 Gs
114.9 mT
|
0.07 kg / 0.16 pounds
73.7 g / 0.7 N
|
low risk |
| 10 mm |
323 Gs
32.3 mT
|
0.01 kg / 0.01 pounds
5.8 g / 0.1 N
|
low risk |
| 15 mm |
131 Gs
13.1 mT
|
0.00 kg / 0.00 pounds
1.0 g / 0.0 N
|
low risk |
| 20 mm |
66 Gs
6.6 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
low risk |
| 30 mm |
24 Gs
2.4 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 50 mm |
6 Gs
0.6 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Vertical load (wall)
MW 8x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.37 kg / 0.81 pounds
368.0 g / 3.6 N
|
| 1 mm | Stal (~0.2) |
0.21 kg / 0.46 pounds
208.0 g / 2.0 N
|
| 2 mm | Stal (~0.2) |
0.11 kg / 0.24 pounds
108.0 g / 1.1 N
|
| 3 mm | Stal (~0.2) |
0.05 kg / 0.12 pounds
54.0 g / 0.5 N
|
| 5 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
14.0 g / 0.1 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MW 8x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.55 kg / 1.22 pounds
552.0 g / 5.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.37 kg / 0.81 pounds
368.0 g / 3.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.18 kg / 0.41 pounds
184.0 g / 1.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.92 kg / 2.03 pounds
920.0 g / 9.0 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MW 8x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.18 kg / 0.41 pounds
184.0 g / 1.8 N
|
| 1 mm |
|
0.46 kg / 1.01 pounds
460.0 g / 4.5 N
|
| 2 mm |
|
0.92 kg / 2.03 pounds
920.0 g / 9.0 N
|
| 3 mm |
|
1.38 kg / 3.04 pounds
1380.0 g / 13.5 N
|
| 5 mm |
|
1.84 kg / 4.06 pounds
1840.0 g / 18.1 N
|
| 10 mm |
|
1.84 kg / 4.06 pounds
1840.0 g / 18.1 N
|
| 11 mm |
|
1.84 kg / 4.06 pounds
1840.0 g / 18.1 N
|
| 12 mm |
|
1.84 kg / 4.06 pounds
1840.0 g / 18.1 N
|
Table 5: Working in heat (stability) - thermal limit
MW 8x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.84 kg / 4.06 pounds
1840.0 g / 18.1 N
|
OK |
| 40 °C | -2.2% |
1.80 kg / 3.97 pounds
1799.5 g / 17.7 N
|
OK |
| 60 °C | -4.4% |
1.76 kg / 3.88 pounds
1759.0 g / 17.3 N
|
OK |
| 80 °C | -6.6% |
1.72 kg / 3.79 pounds
1718.6 g / 16.9 N
|
|
| 100 °C | -28.8% |
1.31 kg / 2.89 pounds
1310.1 g / 12.9 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MW 8x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
10.22 kg / 22.52 pounds
6 064 Gs
|
1.53 kg / 3.38 pounds
1532 g / 15.0 N
|
N/A |
| 1 mm |
7.82 kg / 17.25 pounds
10 050 Gs
|
1.17 kg / 2.59 pounds
1174 g / 11.5 N
|
7.04 kg / 15.52 pounds
~0 Gs
|
| 2 mm |
5.79 kg / 12.77 pounds
8 646 Gs
|
0.87 kg / 1.92 pounds
869 g / 8.5 N
|
5.21 kg / 11.49 pounds
~0 Gs
|
| 3 mm |
4.19 kg / 9.25 pounds
7 358 Gs
|
0.63 kg / 1.39 pounds
629 g / 6.2 N
|
3.77 kg / 8.32 pounds
~0 Gs
|
| 5 mm |
2.13 kg / 4.69 pounds
5 238 Gs
|
0.32 kg / 0.70 pounds
319 g / 3.1 N
|
1.91 kg / 4.22 pounds
~0 Gs
|
| 10 mm |
0.41 kg / 0.90 pounds
2 299 Gs
|
0.06 kg / 0.14 pounds
61 g / 0.6 N
|
0.37 kg / 0.81 pounds
~0 Gs
|
| 20 mm |
0.03 kg / 0.07 pounds
646 Gs
|
0.00 kg / 0.01 pounds
5 g / 0.0 N
|
0.03 kg / 0.06 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
76 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
47 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
31 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
22 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
16 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
12 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MW 8x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 3.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.5 cm |
| Car key | 50 Gs (5.0 mT) | 2.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Collisions (kinetic energy) - warning
MW 8x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.32 km/h
(6.20 m/s)
|
0.07 J | |
| 30 mm |
38.59 km/h
(10.72 m/s)
|
0.22 J | |
| 50 mm |
49.82 km/h
(13.84 m/s)
|
0.36 J | |
| 100 mm |
70.46 km/h
(19.57 m/s)
|
0.72 J |
Table 9: Coating parameters (durability)
MW 8x10 / 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 8x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 3 040 Mx | 30.4 µWb |
| Pc Coefficient | 1.00 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MW 8x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.84 kg | Standard |
| Water (riverbed) |
2.11 kg
(+0.27 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) drastically limits 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) = 1.00
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Pros and cons of rare earth magnets.
Strengths
- Their magnetic field remains stable, and after around 10 years it decreases only by ~1% (theoretically),
- They possess excellent resistance to weakening of magnetic properties due to external magnetic sources,
- Thanks to the reflective finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
- They show high magnetic induction at the operating surface, which increases their power,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of custom forming as well as optimizing to concrete conditions,
- Versatile presence in modern technologies – they are used in computer drives, drive modules, medical devices, and multitasking production systems.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Disadvantages
- To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Limited ability of making threads in the magnet and complex forms - recommended is cover - magnet mounting.
- Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these devices are able to disrupt the diagnostic process medical when they are in the body.
- Due to expensive raw materials, their price exceeds standard values,
Holding force characteristics
Magnetic strength at its maximum – what contributes to it?
- with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
- whose thickness is min. 10 mm
- characterized by smoothness
- without any insulating layer between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- at standard ambient temperature
What influences lifting capacity in practice
- Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Load vector – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Steel grade – ideal substrate is pure iron steel. Hardened steels may attract less.
- Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
- Thermal factor – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate decreases the holding force.
Warnings
Material brittleness
Neodymium magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets will cause them cracking into small pieces.
Mechanical processing
Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.
Allergy Warning
Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, cease working with magnets and use protective gear.
Crushing risk
Danger of trauma: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.
Demagnetization risk
Control the heat. Heating the magnet to high heat will destroy its magnetic structure and strength.
GPS and phone interference
Navigation devices and smartphones are highly susceptible to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.
Handling rules
Use magnets with awareness. Their immense force can surprise even experienced users. Plan your moves and do not underestimate their power.
Magnetic media
Data protection: Strong magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).
Health Danger
Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.
Danger to the youngest
Always keep magnets out of reach of children. Choking hazard is high, and the effects of magnets clamping inside the body are life-threatening.
