Pup joints are essential components in industrial pipeline connections, typically used to help adjust the length of the pipe string and compatible with various sizes and connection types. Based on the connection type, pup joints can be classified into threaded and flanged types, with threaded pup joints further divided into double-male thread, single-male thread, and flat-end thread types. Additionally, pup joints can be categorized by their function into tubing pup joints and casing pup joints, widely utilized in oil, natural gas, and other industrial pipeline connections. Baowi Steel offers various sizes of tubing pup joints, both flat-end and externally thickened, with steel grades including J, N, and L to meet different operational requirements.