JIS B 2406-1991:JIS B 2407-1995:JIS B 2408-2005:JIS B 2401:2005
範囲
This Standard specifies the back-up rings that are intended for preventing extrusion of O-rings specified in JIS B 2401-1.
NOTE ：The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.
ISO 3601-4-2008 Fluid power systems-O-rings-Part 4:Anti-ex-trusion rings (back-up rings) (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.