Sealing ring wire diameter .21*2.2/2.3*2.4/2.25*2.35 O-ring specifications wire diameter sealing parts round sealing ring wire diameter 15.6*2.15 19.8*2.37, GB National Standard ISO National Standard DIN German Standard SAME/ANSI American Standard JIS Japanese Standard IFI American Standard EN European Standard NF French Standard BS British Standard UNI Italian Standard GOST Russian Standard AS Australian Standard NZS New Zealand Standard KS Korean Standard CNS Taiwan Standard IS Indian Standard PN Polish Standard ASTM American Standard rubber ring sealing ring o-ring standard parts star ring and sealing gasket flat washer rectangular rubber ring