Name:carbon steel coupling/socket Material:carbon steel Size:1/8"--4" Thread standard:BSP,DIN ,NPT,BSPT Specifications:1. Material:carbon ... steel2. Size: 1/8"-4"3. Standard: ANSI, ASTM, DIN, BS, JIS4. Thread:DIN,BSP ... .Lily JingCANGZHOU SHENGXIONG STAINLESS STEEL PRODUCTS CO.,LTD. carbon steel socket/coupling