Dongfang Pump won the title of three energy-saving products in Shanghai (Figure)
Taps and dies are tools used to create purpose screw threads, which is called threading. Many are cutting tools; others are forming tools. A tap is used to cut or form the female portion of the mating pair (e.g. a nut). A die is used to cut or form the male portion of the mating pair (e.g. a bolt). The process of cutting or forming threads using a tap is called tapping, whereas the process using a die is called threading. Drill And Tap Set,Hand Tap And Die,Cutting Tool Sets,Hand Tap Wrench Behappy Crafts (suzhou)Co.,Ltd , https://www.haoyuebehappy.com
Using an ordinary tap or die to clean threads generally removes some material, which results in looser, weaker threads. Because of this, machinists generally clean threads with special taps and dies-called chasers-made for that purpose.