oil drill pipe joints Gauge Series API SPEC7-2-0068
1) digital connector series: NC16 --- NC77
2) within the flat connector series: 23/8IF---65/8IF
3) formal joint series: 11/2REG-85/8REG
4) intersecting eye connector series: 27/8FH-65/8 FH
5) intersecting eye connector series: 27/8FH-65/8 FH
6) H90 Series: 31 / H90-85/8H90
7) SLH90 Series: 23/8 SLH90-31/2SLH90
8) OH SW Series: 27/8OH SW-41/2 OH SW
9) OH LW series: 4OH LW
10) PAC series: 23/8PAC-31/2 PAC
11) SH series: 27/8SH-4SH
12) WO series: 23/8WO-31/2 WO
13) XH Series: 27/8XH-31/2 XH
14) GOST Series: Z161 - Z189