A needle roller bearing is a special type of roller bearing which uses long, thin cylindrical rollers resembling needles. Ordinary Roller Bearings' rollers are only slightly longer than their diameter, but needle bearings typically have rollers that are at least four times longer than their diameter.Like all bearings, they are used to reduce the friction of a rotating surface. Needle Roller Bearings,Steel Needle Roller Bearing,Double Row Needle Roller Bearing,High Precision Needle Roller Bearings Ningbo Ritbearing Imp & Exp Co.,Ltd. , https://www.nbbearing.de
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Submerged rescue air lift bag products are used world-wide for raising sunken objects, vessel salvage, marine structure stabilization, underwater equipment transport, pipeline and equipment towing, and standby emergency buoyancy.
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All submerged rescue air lift bags are manufactured comply with IMCA D016 Guidlines.
 
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FAQ
1. Q: How long is the warranty period?
  A: The warranty period is 12 months or 18 months from the shipping date.
2. Q: Do you provide rent service, contract service?
  A: We have many water bags and air lift bags ready for rent service for clients all over the world.
    We have ability to design and can contract the load testing project, with our own water bags and  workers.
3. Q: What is the production standard and safety factor?
  A: All underwater air lift bags are manufactured in compliance with IMCA D016, safety factor is  5:1.
    All crane load test water bags are manufactured in compliance with LEEA051, safety factor is 6:1.
4. Q: Do you have stock?
  A: We have many normal size underwater air lift bags and load test water bags in stock. Ready for shipment.
5. Q: What kind of certificate do you provide?
  A: Our load test water bags are Type Certificated by TUV NEL. We can provice ABS, BV, LR third party certificate.
     Provide the certificate for masterlink, shackles, lifting belts and other accessories.
If you have any other questions, please feel free to contact us.
Compared to Ball Bearings and ordinary roller bearings, needle bearings have a greater surface area in contact with the races, so they can support a greater load. They are also thinner, so they require less clearance between the axle and the surrounding structure.
Needle bearings are heavily used in automobile components such as rocker arm pivots, pumps, compressors, and transmissions. The drive shaft of a rear-wheel drive vehicle typically has at least eight needle bearings (four in each U joint) and often more if it is particularly long, or operates on steep slopes.
Submerged Rescue & Flotation Air Lift Bags
Model NO.: Air lift bag
Lift Bag UV: Resistance
Lift Bag Weld: RF
Safety Factor: 6:1
Production Standard: Imca D 016
Lift Bag Valve: Auto Pressure Relief Valves
Lift Bag Capacity: 25kg-50000kg
OEM: Accept
Trademark: DOOWIN, DOOFLEX
Transport Package: Polywood Box for Shipping
Specification: OBP
Origin: Qingdao, Shandong
Submerged rescue air lift bag include the open bottom parachute type air lift bags, totally enclosed type air lift bags, pillow type air lift bags, inflatable buoyancy bags, pipeline buoyancy system.