UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread
magnetic holder rubber internal thread
Catalog no 160306
GTIN: 5906301813644
Diameter Ø
34 mm [±1 mm]
Height
8 mm [±1 mm]
Weight
22 g
Load capacity
7.70 kg / 75.51 N
9.84 ZŁ with VAT / pcs + price for transport
8.00 ZŁ net + 23% VAT / pcs
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UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread
Specification / characteristics UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread
| properties | values |
|---|---|
| Cat. no. | 160306 |
| GTIN | 5906301813644 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| Diameter Ø | 34 mm [±1 mm] |
| Height | 8 mm [±1 mm] |
| Weight | 22 g |
| Load capacity ~ ? | 7.70 kg / 75.51 N |
| 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 deals
Advantages and disadvantages of neodymium magnets.
Besides their exceptional field intensity, neodymium magnets offer the following advantages:
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
- They are extremely resistant to demagnetization induced by presence of other magnetic fields,
- A magnet with a shiny nickel surface looks better,
- Neodymium magnets generate maximum magnetic induction on a small surface, which allows for strong attraction,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Possibility of exact shaping and modifying to individual requirements,
- Key role in modern technologies – they serve a role in mass storage devices, brushless drives, precision medical tools, also technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in small systems
Disadvantages of neodymium magnets:
- They are fragile upon too strong 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 strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- We suggest casing - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
- Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these devices can be problematic in diagnostics medical in case of swallowing.
- With large orders the cost of neodymium magnets is a challenge,
Detachment force of the magnet in optimal conditions – what contributes to it?
The load parameter shown concerns the peak performance, measured under laboratory conditions, specifically:
- on a block made of mild steel, perfectly concentrating the magnetic flux
- possessing a thickness of min. 10 mm to avoid saturation
- characterized by smoothness
- without any air gap between the magnet and steel
- during pulling in a direction perpendicular to the mounting surface
- in neutral thermal conditions
Determinants of lifting force in real conditions
Holding efficiency impacted by specific conditions, such as (from most important):
- Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
- Angle of force application – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually several times lower (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 type – the best choice is high-permeability steel. Hardened steels may attract less.
- Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
- Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
* Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.
Safety rules for work with NdFeB magnets
Do not overheat magnets
Avoid heat. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).
Metal Allergy
Studies show that nickel (standard magnet coating) is a strong allergen. If you have an allergy, prevent direct skin contact or choose encased magnets.
Keep away from computers
Do not bring magnets near a wallet, laptop, or TV. The magnetism can destroy these devices and wipe information from cards.
Magnet fragility
Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.
Keep away from children
NdFeB magnets are not toys. Eating a few magnets may result in them attracting across intestines, which constitutes a direct threat to life and requires immediate surgery.
Medical implants
Warning for patients: Strong magnetic fields disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.
Pinching danger
Large magnets can smash fingers instantly. Do not put your hand between two attracting surfaces.
Fire warning
Fire hazard: Neodymium dust is explosive. Do not process magnets without safety gear as this risks ignition.
Handling rules
Before use, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.
GPS Danger
GPS units and smartphones are highly susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.
Caution!
Details about risks in the article: Magnet Safety Guide.
