scope:

This Standard specifies the dimensions of fixed or rotatable bolted knife-edge flanges used in vacuum systems for pressures ranging from atmospheric to as low as 10^-11 Pa.

NOTE 1 Knife-edge flanges were originally developed as ConFlat® flanges by the American company, Varian, Inc.

NOTE 2 ConFlat® is the trademark of a product supplied by Varian, Inc. This information is given for the convenience of users of the corresponding International Standard and this Standard, and does not constitute an endorsement by JIS of the product named.

NOTE 3 Prior to the establishment of this Standard, the Vacuum Society of Japan (now The Japan Society of Vacuum and Surface Science) standard JVIS 003-1982 was traditionally used as the standard for knife-edge flanges [10].

NOTE 4 The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 3669 : 2020 Vacuum technology - Dimensions of knife-edge flanges (MOD)

In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/IEC Guide 21-1.