... supplier in China 5.CHNSEA 1.corrosive resistance2.API certified Lens Gaskets 3.used in oilfield equipment4.specialised supplier in ... China5.CHNSEADescription: gasket shape octagonal, oval ,lens, serrated standards API 6A,HG20633-97,HG20612-97,ISO9001:2000 ... 304,Gr.630(A264-17.4Ph) F5,F51,317L,904L 7.hardness:below 160HB Max Temperature10#/08#/ carbon steel/D: 450soft ...