MW 8x8 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010106
GTIN/EAN: 5906301811053
Diameter Ø
8 mm [±0,1 mm]
Height
8 mm [±0,1 mm]
Weight
3.02 g
Magnetization Direction
↑ axial
Load capacity
2.03 kg / 19.92 N
Magnetic Induction
553.67 mT / 5537 Gs
Coating
[NiCuNi] Nickel
1.341 ZŁ with VAT / pcs + price for transport
1.090 ZŁ net + 23% VAT / pcs
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Physical properties - MW 8x8 / N38 - cylindrical magnet
Specification / characteristics - MW 8x8 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010106 |
| GTIN/EAN | 5906301811053 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 8 mm [±0,1 mm] |
| Weight | 3.02 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.03 kg / 19.92 N |
| Magnetic Induction ~ ? | 553.67 mT / 5537 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 analysis of the assembly - report
The following information constitute the outcome of a engineering calculation. Values rely on models for the material Nd2Fe14B. Actual performance may differ from theoretical values. Treat these data as a preliminary roadmap when designing systems.
Table 1: Static force (pull vs gap) - characteristics
MW 8x8 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5531 Gs
553.1 mT
|
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
warning |
| 1 mm |
4162 Gs
416.2 mT
|
1.15 kg / 2.53 lbs
1149.3 g / 11.3 N
|
low risk |
| 2 mm |
2984 Gs
298.4 mT
|
0.59 kg / 1.30 lbs
590.7 g / 5.8 N
|
low risk |
| 3 mm |
2107 Gs
210.7 mT
|
0.29 kg / 0.65 lbs
294.5 g / 2.9 N
|
low risk |
| 5 mm |
1084 Gs
108.4 mT
|
0.08 kg / 0.17 lbs
78.0 g / 0.8 N
|
low risk |
| 10 mm |
296 Gs
29.6 mT
|
0.01 kg / 0.01 lbs
5.8 g / 0.1 N
|
low risk |
| 15 mm |
118 Gs
11.8 mT
|
0.00 kg / 0.00 lbs
0.9 g / 0.0 N
|
low risk |
| 20 mm |
58 Gs
5.8 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
low risk |
| 30 mm |
20 Gs
2.0 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
Table 2: Shear load (vertical surface)
MW 8x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.41 kg / 0.90 lbs
406.0 g / 4.0 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
|
| 2 mm | Stal (~0.2) |
0.12 kg / 0.26 lbs
118.0 g / 1.2 N
|
| 3 mm | Stal (~0.2) |
0.06 kg / 0.13 lbs
58.0 g / 0.6 N
|
| 5 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
16.0 g / 0.2 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 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: Wall mounting (shearing) - vertical pull
MW 8x8 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.61 kg / 1.34 lbs
609.0 g / 6.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.41 kg / 0.90 lbs
406.0 g / 4.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.20 kg / 0.45 lbs
203.0 g / 2.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.02 kg / 2.24 lbs
1015.0 g / 10.0 N
|
Table 4: Material efficiency (substrate influence) - power losses
MW 8x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.20 kg / 0.45 lbs
203.0 g / 2.0 N
|
| 1 mm |
|
0.51 kg / 1.12 lbs
507.5 g / 5.0 N
|
| 2 mm |
|
1.02 kg / 2.24 lbs
1015.0 g / 10.0 N
|
| 3 mm |
|
1.52 kg / 3.36 lbs
1522.5 g / 14.9 N
|
| 5 mm |
|
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
| 10 mm |
|
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
| 11 mm |
|
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
| 12 mm |
|
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
Table 5: Working in heat (stability) - resistance threshold
MW 8x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.03 kg / 4.48 lbs
2030.0 g / 19.9 N
|
OK |
| 40 °C | -2.2% |
1.99 kg / 4.38 lbs
1985.3 g / 19.5 N
|
OK |
| 60 °C | -4.4% |
1.94 kg / 4.28 lbs
1940.7 g / 19.0 N
|
OK |
| 80 °C | -6.6% |
1.90 kg / 4.18 lbs
1896.0 g / 18.6 N
|
|
| 100 °C | -28.8% |
1.45 kg / 3.19 lbs
1445.4 g / 14.2 N
|
Table 6: Two magnets (repulsion) - forces in the system
MW 8x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
9.48 kg / 20.90 lbs
6 000 Gs
|
1.42 kg / 3.14 lbs
1422 g / 14.0 N
|
N/A |
| 1 mm |
7.26 kg / 16.01 lbs
9 682 Gs
|
1.09 kg / 2.40 lbs
1089 g / 10.7 N
|
6.54 kg / 14.41 lbs
~0 Gs
|
| 2 mm |
5.37 kg / 11.83 lbs
8 324 Gs
|
0.81 kg / 1.78 lbs
805 g / 7.9 N
|
4.83 kg / 10.65 lbs
~0 Gs
|
| 3 mm |
3.88 kg / 8.55 lbs
7 074 Gs
|
0.58 kg / 1.28 lbs
582 g / 5.7 N
|
3.49 kg / 7.69 lbs
~0 Gs
|
| 5 mm |
1.95 kg / 4.30 lbs
5 016 Gs
|
0.29 kg / 0.64 lbs
292 g / 2.9 N
|
1.75 kg / 3.87 lbs
~0 Gs
|
| 10 mm |
0.36 kg / 0.80 lbs
2 169 Gs
|
0.05 kg / 0.12 lbs
55 g / 0.5 N
|
0.33 kg / 0.72 lbs
~0 Gs
|
| 20 mm |
0.03 kg / 0.06 lbs
592 Gs
|
0.00 kg / 0.01 lbs
4 g / 0.0 N
|
0.02 kg / 0.05 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
66 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
41 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
27 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
19 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
14 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
10 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) - precautionary measures
MW 8x8 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 3.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.5 cm |
| Remote | 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: Dynamics (cracking risk) - warning
MW 8x8 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
26.19 km/h
(7.28 m/s)
|
0.08 J | |
| 30 mm |
45.29 km/h
(12.58 m/s)
|
0.24 J | |
| 50 mm |
58.47 km/h
(16.24 m/s)
|
0.40 J | |
| 100 mm |
82.68 km/h
(22.97 m/s)
|
0.80 J |
Table 9: Anti-corrosion coating durability
MW 8x8 / 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 (Flux)
MW 8x8 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 868 Mx | 28.7 µWb |
| Pc Coefficient | 0.89 | High (Stable) |
Table 11: Submerged application
MW 8x8 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.03 kg | Standard |
| Water (riverbed) |
2.32 kg
(+0.29 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical surface, the magnet retains only a fraction of its max power.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) severely weakens 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) = 0.89
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.
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 |
View also offers
Pros and cons of rare earth magnets.
Advantages
- They do not lose magnetism, even during nearly 10 years – the reduction in strength is only ~1% (based on measurements),
- They retain their magnetic properties even under strong external field,
- By covering with a shiny coating of silver, the element presents an modern look,
- Neodymium magnets achieve maximum magnetic induction on a small surface, which allows for strong attraction,
- Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of custom machining and adapting to concrete requirements,
- Key role in electronics industry – they are used in hard drives, electric drive systems, medical devices, also industrial machines.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Disadvantages
- At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- 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.
- We recommend a housing - magnetic holder, due to difficulties in producing nuts inside the magnet and complicated forms.
- Health risk related to microscopic parts of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts of these products are able to disrupt the diagnostic process medical in case of swallowing.
- Due to expensive raw materials, their price is higher than average,
Pull force analysis
Magnetic strength at its maximum – what it depends on?
- using a base made of low-carbon steel, functioning as a magnetic yoke
- possessing a thickness of minimum 10 mm to avoid saturation
- characterized by smoothness
- under conditions of gap-free contact (metal-to-metal)
- under axial application of breakaway force (90-degree angle)
- in stable room temperature
Magnet lifting force in use – key factors
- Distance – the presence of any layer (rust, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
- Material type – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
- Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
- Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.
Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a slight gap between the magnet and the plate decreases the load capacity.
Safe handling of neodymium magnets
Warning for heart patients
Individuals with a pacemaker must maintain an safe separation from magnets. The magnetism can disrupt the functioning of the implant.
Risk of cracking
Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Powerful field
Use magnets with awareness. Their huge power can surprise even experienced users. Stay alert and do not underestimate their force.
Product not for children
Absolutely store magnets out of reach of children. Ingestion danger is significant, and the effects of magnets connecting inside the body are fatal.
Hand protection
Large magnets can break fingers instantly. Under no circumstances put your hand between two strong magnets.
Allergy Warning
Medical facts indicate that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or opt for versions in plastic housing.
Permanent damage
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.
Magnetic interference
A powerful magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Keep magnets close to a device to prevent damaging the sensors.
Dust is flammable
Dust produced during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.
Electronic devices
Avoid bringing magnets close to a purse, computer, or screen. The magnetism can destroy these devices and erase data from cards.
