圈上海文大华 Thread Form Coarse series:Screw thread is bigger than the fine thread. >Most common >Recommended for ordinary applications >Especially where repeated insertions and removals of the screw are required,or >Where screw is threaded into softer material D- 圈上泽夫道大学 Thread Form ▣Fine threads >More resistant to loosening from vibrations than coarse threads >Because of their smaller lead angle >Used in applications that are subject to vibration. Used in automobiles aircraft Extra fine series threads >Used where wall thickness is limited >Their short threads are an advantage. 1616  Coarse series: Screw thread is bigger than the fine thread.  Most common Recommended for ordinary applications Especially where repeated insertions and removals of the screw are required, or Where screw is threaded into softer material Thread Form  Fine threads  More resistant to loosening from vibrations than coarse threads Because of their smaller lead angle Used in applications that are subject to vibration. = Used in automobiles = aircraft  Extra fine series threads Used where wall thickness is limited Their short threads are an advantage. Thread Form