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
- Coating
- [NiCuNi] Nickel
1.341 zł with VAT / pcs + price for transport
1.090 zł net + 23% VAT / pcs
bulk discounts:
Need more?Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Technical of the product - 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 |
Technical simulation of the product - report
Presented values represent the result of a physical simulation. Values are based on models for the material Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Use these calculations as a reference point when designing systems.
Table 1: Static force (force vs gap) - power drop
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 pounds
2030.0 g / 19.9 N
|
medium risk |
| 1 mm |
4162 Gs
416.2 mT
|
1.15 kg / 2.53 pounds
1149.3 g / 11.3 N
|
safe |
| 2 mm |
2984 Gs
298.4 mT
|
0.59 kg / 1.30 pounds
590.7 g / 5.8 N
|
safe |
| 3 mm |
2107 Gs
210.7 mT
|
0.29 kg / 0.65 pounds
294.5 g / 2.9 N
|
safe |
| 5 mm |
1084 Gs
108.4 mT
|
0.08 kg / 0.17 pounds
78.0 g / 0.8 N
|
safe |
| 10 mm |
296 Gs
29.6 mT
|
0.01 kg / 0.01 pounds
5.8 g / 0.1 N
|
safe |
| 15 mm |
118 Gs
11.8 mT
|
0.00 kg / 0.00 pounds
0.9 g / 0.0 N
|
safe |
| 20 mm |
58 Gs
5.8 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
safe |
| 30 mm |
20 Gs
2.0 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
| 50 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
safe |
Table 2: Vertical force (wall)
MW 8x8 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.41 kg / 0.90 pounds
406.0 g / 4.0 N
|
| 1 mm | Stal (~0.2) |
0.23 kg / 0.51 pounds
230.0 g / 2.3 N
|
| 2 mm | Stal (~0.2) |
0.12 kg / 0.26 pounds
118.0 g / 1.2 N
|
| 3 mm | Stal (~0.2) |
0.06 kg / 0.13 pounds
58.0 g / 0.6 N
|
| 5 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
16.0 g / 0.2 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 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 pounds
609.0 g / 6.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.41 kg / 0.90 pounds
406.0 g / 4.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.20 kg / 0.45 pounds
203.0 g / 2.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.02 kg / 2.24 pounds
1015.0 g / 10.0 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MW 8x8 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.20 kg / 0.45 pounds
203.0 g / 2.0 N
|
| 1 mm |
|
0.51 kg / 1.12 pounds
507.5 g / 5.0 N
|
| 2 mm |
|
1.02 kg / 2.24 pounds
1015.0 g / 10.0 N
|
| 3 mm |
|
1.52 kg / 3.36 pounds
1522.5 g / 14.9 N
|
| 5 mm |
|
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
|
| 10 mm |
|
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
|
| 11 mm |
|
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
|
| 12 mm |
|
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
|
Table 5: Thermal resistance (stability) - thermal limit
MW 8x8 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.03 kg / 4.48 pounds
2030.0 g / 19.9 N
|
OK |
| 40 °C | -2.2% |
1.99 kg / 4.38 pounds
1985.3 g / 19.5 N
|
OK |
| 60 °C | -4.4% |
1.94 kg / 4.28 pounds
1940.7 g / 19.0 N
|
OK |
| 80 °C | -6.6% |
1.90 kg / 4.18 pounds
1896.0 g / 18.6 N
|
|
| 100 °C | -28.8% |
1.45 kg / 3.19 pounds
1445.4 g / 14.2 N
|
Table 6: Two magnets (repulsion) - field range
MW 8x8 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
9.48 kg / 20.90 pounds
6 000 Gs
|
1.42 kg / 3.14 pounds
1422 g / 14.0 N
|
N/A |
| 1 mm |
7.26 kg / 16.01 pounds
9 682 Gs
|
1.09 kg / 2.40 pounds
1089 g / 10.7 N
|
6.54 kg / 14.41 pounds
~0 Gs
|
| 2 mm |
5.37 kg / 11.83 pounds
8 324 Gs
|
0.81 kg / 1.78 pounds
805 g / 7.9 N
|
4.83 kg / 10.65 pounds
~0 Gs
|
| 3 mm |
3.88 kg / 8.55 pounds
7 074 Gs
|
0.58 kg / 1.28 pounds
582 g / 5.7 N
|
3.49 kg / 7.69 pounds
~0 Gs
|
| 5 mm |
1.95 kg / 4.30 pounds
5 016 Gs
|
0.29 kg / 0.64 pounds
292 g / 2.9 N
|
1.75 kg / 3.87 pounds
~0 Gs
|
| 10 mm |
0.36 kg / 0.80 pounds
2 169 Gs
|
0.05 kg / 0.12 pounds
55 g / 0.5 N
|
0.33 kg / 0.72 pounds
~0 Gs
|
| 20 mm |
0.03 kg / 0.06 pounds
592 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.02 kg / 0.05 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
66 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
41 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
27 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
19 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
14 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
10 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (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 |
| 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: Impact energy (kinetic energy) - warning
MW 8x8 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
16.64 km/h
(4.62 m/s)
|
0.03 J | |
| 30 mm |
16.68 km/h
(4.63 m/s)
|
0.03 J | |
| 50 mm |
16.68 km/h
(4.63 m/s)
|
0.03 J | |
| 100 mm |
16.68 km/h
(4.63 m/s)
|
0.03 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: Electrical data (Pc)
MW 8x8 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 868 Mx | 28.7 µWb |
| Pc Coefficient | 0.89 | High (Stable) |
Table 11: Physics of underwater searching
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
*Caution: On a vertical surface, the magnet retains just approx. 20-30% of its max power.
2. Plate thickness effect
*Thin steel (e.g. computer case) drastically weakens the holding force.
3. Heat tolerance
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.89
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Advantages as well as disadvantages of rare earth magnets.
Strengths
- They do not lose strength, even during around 10 years – the decrease in strength is only ~1% (based on measurements),
- Neodymium magnets are characterized by remarkably resistant to demagnetization caused by external interference,
- Thanks to the shiny finish, the surface of nickel, gold-plated, or silver-plated gives an elegant appearance,
- They show high magnetic induction at the operating surface, which increases their power,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of precise forming as well as adapting to individual conditions,
- Universal use in innovative solutions – they serve a role in magnetic memories, electric drive systems, precision medical tools, as well as modern systems.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices
Cons
- To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- Limited possibility of making nuts in the magnet and complex shapes - preferred is casing - magnetic holder.
- Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Highest magnetic holding force – what it depends on?
- using a base made of low-carbon steel, functioning as a ideal flux conductor
- possessing a thickness of min. 10 mm to avoid saturation
- with a surface perfectly flat
- without the slightest air gap between the magnet and steel
- under axial force vector (90-degree angle)
- at ambient temperature room level
Key elements affecting lifting force
- Clearance – existence of foreign body (paint, dirt, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
- Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
- Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
- Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the load capacity.
Precautions when working with neodymium magnets
Adults only
Product intended for adults. Tiny parts can be swallowed, leading to serious injuries. Keep out of reach of children and animals.
Health Danger
Health Alert: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Threat to navigation
GPS units and mobile phones are extremely susceptible to magnetic fields. Direct contact with a strong magnet can decalibrate the sensors in your phone.
Crushing force
Big blocks can crush fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.
Beware of splinters
Beware of splinters. Magnets can fracture upon violent connection, ejecting shards into the air. We recommend safety glasses.
Do not overheat magnets
Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.
Do not drill into magnets
Powder created during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Avoid contact if allergic
Certain individuals suffer from a sensitization to Ni, which is the common plating for NdFeB magnets. Prolonged contact may cause skin redness. It is best to wear safety gloves.
Threat to electronics
Do not bring magnets close to a purse, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.
Conscious usage
Use magnets with awareness. Their powerful strength can shock even experienced users. Plan your moves and do not underestimate their power.
