MW 8x20 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010475
GTIN: 5906301811138
Diameter Ø
8 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
7.54 g
Magnetization Direction
→ diametrical
Load capacity
3.9 kg / 38.27 N
Magnetic Induction
607.01 mT
Coating
[NiCuNi] Nickel
4.60 ZŁ with VAT / pcs + price for transport
3.74 ZŁ net + 23% VAT / pcs
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MW 8x20 / N38 - cylindrical magnet
Specification / characteristics MW 8x20 / N38 - cylindrical magnet
| properties | values |
|---|---|
| Cat. no. | 010475 |
| GTIN | 5906301811138 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 8 mm [±0,1 mm] |
| Height | 20 mm [±0,1 mm] |
| Weight | 7.54 g |
| Magnetization Direction | → diametrical |
| Load capacity ~ ? | 3.9 kg / 38.27 N |
| Magnetic Induction ~ ? | 607.01 mT |
| 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 | T |
| 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 106 | °C-1 |
| Thermal expansion perpendicular (⊥) to orientation (M) | -(1-3) x 10-6 | °C-1 |
| Young's modulus | 1.7 x 104 | kg/mm² |
Detailed Physics Simulation
Values presented are based on mathematical calculations for NdFeB material. Actual conditions may vary.
MW 8x20 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
6064 Gs
606.4 mT
|
0.87 kg / 873.9 g
8.6 N
|
Low Risk |
| 1 mm |
4587 Gs
458.7 mT
|
0.50 kg / 500.0 g
4.9 N
|
Low Risk |
| 2 mm |
3327 Gs
332.7 mT
|
0.26 kg / 263.1 g
2.6 N
|
Low Risk |
| 5 mm |
1281 Gs
128.1 mT
|
0.04 kg / 39.0 g
0.4 N
|
Low Risk |
| 10 mm |
389 Gs
38.9 mT
|
0.00 kg / 3.6 g
0.0 N
|
Low Risk |
| 15 mm |
169 Gs
16.9 mT
|
0.00 kg / 0.7 g
0.0 N
|
Low Risk |
| 20 mm |
90 Gs
9.0 mT
|
0.00 kg / 0.2 g
0.0 N
|
Low Risk |
| 30 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.0 g
0.0 N
|
Low Risk |
| 50 mm |
10 Gs
1.0 mT
|
0.00 kg / 0.0 g
0.0 N
|
Low Risk |
MW 8x20 / N38
| Surface Type | Friction Coeff. | Max Load (kg) |
|---|---|---|
| Raw Steel | µ = 0.3 |
0.26 kg / 262.2 g
2.6 N
|
| Painted Steel (Standard) | µ = 0.2 |
0.17 kg / 174.8 g
1.7 N
|
| Greasy/Slippery Steel | µ = 0.1 |
0.09 kg / 87.4 g
0.9 N
|
| Magnet with Anti-slip Rubber | µ = 0.5 |
0.44 kg / 437.0 g
4.3 N
|
MW 8x20 / N38
| Steel Thickness (mm) | % Efficiency | Real Pull Force (kg) |
|---|---|---|
| 0.5 mm |
|
0.09 kg / 87.4 g
0.9 N
|
| 1 mm |
|
0.22 kg / 218.5 g
2.1 N
|
| 2 mm |
|
0.44 kg / 437.0 g
4.3 N
|
| 5 mm |
|
0.87 kg / 873.9 g
8.6 N
|
| 10 mm |
|
0.87 kg / 873.9 g
8.6 N
|
MW 8x20 / N38
| Ambient Temp. (°C) | Power Loss | Remaining Pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.87 kg / 873.9 g
8.6 N
|
OK |
| 40 °C | -2.2% |
0.85 kg / 854.7 g
8.4 N
|
OK |
| 60 °C | -4.4% |
0.84 kg / 835.5 g
8.2 N
|
OK |
| 80 °C | -6.6% |
0.82 kg / 816.3 g
8.0 N
|
|
| 100 °C | -28.8% |
0.62 kg / 622.2 g
6.1 N
|
MW 8x20 / N38
| Air Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
1.31 kg / 1305.0 g
12.8 N
|
N/A |
| 2 mm |
0.39 kg / 390.0 g
3.8 N
|
0.36 kg / 364.0 g
3.6 N
|
| 5 mm |
0.06 kg / 60.0 g
0.6 N
|
0.06 kg / 56.0 g
0.5 N
|
| 10 mm |
0.00 kg / 0.0 g
0.0 N
|
0.00 kg / 0.0 g
0.0 N
|
| 20 mm |
0.00 kg / 0.0 g
0.0 N
|
0.00 kg / 0.0 g
0.0 N
|
| 50 mm |
0.00 kg / 0.0 g
0.0 N
|
0.00 kg / 0.0 g
0.0 N
|
MW 8x20 / N38
| Object / Device | Limit (Gauss) / mT | Safe Distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.5 cm |
| Hearing Aid / Implant | 10 Gs (1.0 mT) | 5.0 cm |
| Mechanical Watch | 20 Gs (2.0 mT) | 4.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.0 cm |
| Car Key | 50 Gs (5.0 mT) | 3.0 cm |
| Credit Card | 400 Gs (40.0 mT) | 1.0 cm |
| Hard Drive (HDD) | 600 Gs (60.0 mT) | 1.0 cm |
MW 8x20 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted Effect |
|---|---|---|---|
| 10 mm |
10.89 km/h
(3.02 m/s)
|
0.03 J | |
| 30 mm |
18.81 km/h
(5.22 m/s)
|
0.10 J | |
| 50 mm |
24.28 km/h
(6.74 m/s)
|
0.17 J | |
| 100 mm |
34.34 km/h
(9.54 m/s)
|
0.34 J |
MW 8x20 / N38
| Technical Parameter | Value / Description |
|---|---|
| Rodzaj powłoki | Standard |
| Struktura warstw | - |
| Grubość warstwy | - |
| Test mgły solnej (SST) (?) | - |
| Zalecane środowisko | - |
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Advantages as well as disadvantages of rare earth magnets.
Besides their stability, neodymium magnets are valued for these benefits:
- Their power is durable, and after around 10 years it decreases only by ~1% (according to research),
- Magnets effectively protect themselves against demagnetization caused by external fields,
- The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to present itself better,
- Neodymium magnets generate maximum magnetic induction on a contact point, which increases force concentration,
- 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...
- Thanks to modularity in constructing and the ability to modify to complex applications,
- Significant place in modern industrial fields – they find application in mass storage devices, electric motors, medical equipment, as well as complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Disadvantages of neodymium magnets:
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
- 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.
- 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, in case of application outdoors
- Due to limitations in producing nuts and complicated forms in magnets, we recommend using casing - magnetic holder.
- Potential hazard to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that tiny parts of these devices can complicate diagnosis medical after entering the body.
- Due to neodymium price, their price is higher than average,
Best holding force of the magnet in ideal parameters – what it depends on?
Information about lifting capacity is the result of a measurement for the most favorable conditions, taking into account:
- with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
- possessing a massiveness of at least 10 mm to avoid saturation
- characterized by lack of roughness
- without any insulating layer between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- at temperature approx. 20 degrees Celsius
Lifting capacity in real conditions – factors
In real-world applications, the real power is determined by a number of factors, ranked from most significant:
- Gap (betwixt the magnet and the metal), since even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, rust or dirt).
- Load vector – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
- Base massiveness – too thin plate does not accept the full field, causing part of the flux to be lost to the other side.
- Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
- Surface finish – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Temperature – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.
* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate reduces the holding force.
Safety rules for work with NdFeB magnets
Maximum temperature
Keep cool. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).
Serious injuries
Protect your hands. Two large magnets will snap together immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!
Fire risk
Dust created during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.
Beware of splinters
NdFeB magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets leads to them cracking into small pieces.
Danger to the youngest
NdFeB magnets are not intended for children. Swallowing multiple magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and necessitates urgent medical intervention.
Keep away from electronics
Note: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.
Conscious usage
Use magnets with awareness. Their immense force can shock even experienced users. Plan your moves and respect their power.
Life threat
Warning for patients: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to work with the magnets.
Data carriers
Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, hearing aids, timepieces).
Nickel coating and allergies
Nickel alert: The nickel-copper-nickel coating contains nickel. If redness occurs, immediately stop handling magnets and wear gloves.
Safety First!
Want to know more? Read our article: Why are neodymium magnets dangerous?
