... sensitive to the surface defect of flange clamping plane, and not binding the flange sealing surface, convenient to be ... inner &out ring PTFECeramic Available Sizes: ItemDIN (mm)ANSI B16.5 BS1560 (mm)Mss sp-44API 605TolerancesInner ring I.D ... .Gasket I.D.≤600≤24"≥26" & ≤34"±0.5>600 & ≤800>24" & ≤ 34"≥36" & ≤60"±0. ... -92,SH3407-96,HG20610-97,JB/T90-94,ANSI,API,JPI,JIS,DIS,etc.standards or clients ...