B) spring steel has good elasticity, so it is easy to install, can be by means of two inner hook -shaped wrench mounted in any position , so that the inner ring of the internal tension to tighten the shaft. Elastic material processing tolerance h9 or h1l inner ring is relatively easy to achieve.

C) Such bearings durable and are subject to dirt , iron , water, and falling iron with water to form a weak acid has little effect . Thin-walled large diameter spiral ring for the rolling member left a relatively large space. These components can be scrolled through by pressing dirt and foreign matter to spiral circle spiral within the gap . This keeps the bearing surfaces in the rotation movement to keep clean.

D) The main advantage of the spiral bearing outer ring can be reused many times , which makes the temperature as soon as the impact due to the damage caused to be re- bending machining. In this case , bearing need to be adjusted . Structural design of this structure and not only the helical outer package bearing needs to be change , all remaining bearing member can be used again . Bearing is adjusted by 1 mm diameter to increase the amplitude of ways to carry out . For example : When the diameter increased from 105mm to 106mm , the screw outer diameter also need to increase lmm to install. This situation can be repeated to a diameter of up to 110mm . So that the bearing outer ring can be repeated 5 times processed . This can save a lot of costs , especially in all the other bearing member can be reused in the case 6 .