API 6D

API is the abbreviation of American Petroleum Institute. The organization is based on the characteristics of the industry and its own needs within the industry. In 1924, API specification was formulated to guide the production of related products in petroleum industry. As the API standard formulated by the API organization has been expanding in the world due to its advanced nature, versatility, security and the worldwide influence of the American petroleum industry, the API specification has been widely adopted in the world.