1. Our liners can be used in various drilling operation conditions.
2. The bi-metal outer surface is made of premium carbon steel, the inner sleeve is made of wear-resistant high chrome cast iron and the surface hardness reaches HRC62.
3. The sleeve is manufactured to the bore tolerances specified by API to provide longer life by reducing gaps between the liner bore and piston. After the shell and sleeve are assembled, the I.D. of the liner is honed to a perfect circle and polished to a mirror finish. the dimension of the inner hole is precious and service life is up to 800 hours