This standard specifies the dimensions of fixed flanges, loose flanges and caliper flanges used in low, medium and high vacuum equipment used in vacuum technology. It is suitable for connecting flanges of low, medium and high vacuum equipment. This dimension ensures interchangeability between fixed flanges, loose flanges and caliper flanges.
GB/T 6070-2007 Referenced Document
GB/T 17395-1998 Dimensions, shapes, masses and tolerances of seamless steel tubes