Inspection Standard: ASTM A580  /A555
Inspection Items: dimension, chemical composition, mechanical property(tensile strength, yield strength and elongation etc.)

 

Inspection Standard: ASTM A312
Inspection Items: dimension(outside diameter, wall thickness, length), chemical composition, mechanical property(tensile strength, yield strength and elongation etc.)

 

Inspection Standard of the Screens’ Slot size  DIN4935

 

Inspection standard: DIN4935， ISO17824-2009， SYT5182-2008 etc.
Inspection items: dimension(outside diameter,slot size， length）， appearance and packing etc. 

 

 

Inspection Standard: LTC, STC, BTC, NPT, BSPT, etc.
Inspection items: pitch, tooth height, taper, thread length etc.