O-Ring, the cutting edge is a "O" shape, which is the most common, classic, economical and useful sealing type in both dynamic and static application.

To understand a basic idea of O-Ring,it is essential you should know:

• The O-Ring dimension formula is very simple, OD = ID + 2*CS
  
• The popular O-Ring standards are formulated by its location and country
  
• The O-Ring tolerance has its limitation, when the size is out of tolerance; it means failure will cause leakage.
  
• O-Rings are made of elastomers which are with resilience or memory sufficient to return to its original shape after a major or minor distortion

How an O-Ring behave its sealing function: