UMS 20x8.6x4.5x7 / N38 - conical magnetic holder
conical magnetic holder
Catalog no 220327
GTIN: 5906301814177
Diameter Ø
20 mm [±1 mm]
cone dimension Ø
8.6x4.5 mm [±1 mm]
Height
7 mm [±1 mm]
Weight
12 g
Magnetization Direction
↑ axial
Load capacity
6 kg / 58.84 N
Coating
[NiCuNi] Nickel
6.46 ZŁ with VAT / pcs + price for transport
5.25 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?Looking for a better price?
Contact us by phone
+48 888 99 98 98
or contact us via
contact form
the contact form page.
Lifting power and form of neodymium magnets can be checked with our
our magnetic calculator.
Orders placed before 14:00 will be shipped the same business day.
UMS 20x8.6x4.5x7 / N38 - conical magnetic holder
Specification / characteristics UMS 20x8.6x4.5x7 / N38 - conical magnetic holder
| properties | values |
|---|---|
| Cat. no. | 220327 |
| GTIN | 5906301814177 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 20 mm [±1 mm] |
| cone dimension Ø | 8.6x4.5 mm [±1 mm] |
| Height | 7 mm [±1 mm] |
| Weight | 12 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 6 kg / 58.84 N |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±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 |
Other proposals
Strengths as well as weaknesses of NdFeB magnets.
Besides their remarkable magnetic power, neodymium magnets offer the following advantages:
- They do not lose strength, even during approximately 10 years – the decrease in strength is only ~1% (according to tests),
- They have excellent resistance to magnetism drop when exposed to external magnetic sources,
- In other words, due to the metallic layer of gold, the element gains visual value,
- The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
- In view of the option of flexible molding and customization to individualized requirements, neodymium magnets can be modeled in a wide range of geometric configurations, which expands the range of possible applications,
- Fundamental importance in electronics industry – they are utilized in magnetic memories, electric motors, medical equipment, as well as complex engineering applications.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Disadvantages of NdFeB magnets:
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
- Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
- We suggest cover - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
- Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Detachment force of the magnet in optimal conditions – what it depends on?
The load parameter shown represents the limit force, measured under ideal test conditions, specifically:
- with the contact of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- possessing a massiveness of min. 10 mm to avoid saturation
- with a plane cleaned and smooth
- with zero gap (no coatings)
- under perpendicular force direction (90-degree angle)
- at room temperature
Practical aspects of lifting capacity – factors
Bear in mind that the working load will differ subject to the following factors, in order of importance:
- Clearance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
- Direction of force – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
- Material composition – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
- Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
- Temperature influence – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.
* Lifting capacity was measured using a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.
Precautions when working with neodymium magnets
Magnetic interference
Navigation devices and mobile phones are highly sensitive to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.
Safe distance
Equipment safety: Strong magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).
Pacemakers
People with a pacemaker should keep an safe separation from magnets. The magnetism can stop the functioning of the life-saving device.
Swallowing risk
These products are not suitable for play. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates immediate surgery.
Handling guide
Exercise caution. Neodymium magnets act from a long distance and snap with huge force, often faster than you can react.
Fragile material
Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. We recommend safety glasses.
Serious injuries
Big blocks can crush fingers instantly. Never place your hand between two attracting surfaces.
Demagnetization risk
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.
Warning for allergy sufferers
Studies show that nickel (standard magnet coating) is a common allergen. If you have an allergy, avoid touching magnets with bare hands and select coated magnets.
Fire warning
Fire hazard: Rare earth powder is explosive. Do not process magnets in home conditions as this risks ignition.
Warning!
Details about hazards in the article: Safety of working with magnets.
