elbow Stainless Steel : ASTM A403 WP 304/ 304L/ 304H/ 316/ 316L/ 317/ 317L/ 321/ 310/ 347/ 904L/ etc. Carbon Steel : ASTM A23 elbowSpecification:Size:DN6~DN100; NPS1/8"~4" PN: 2000lb, 3000Lb, 6000LbOD:22~152mmWT: Sch80 Sch160 XXS Center to Bottom: 21~114mmLength of Thread: NPT: 6.5~27.5mm; Rc: 6.5~33mm STD: ANSI B16.11, BSP3799, etc. threaded elbow