| Standard |
API |
| Place of Origin |
China (Mainland) |
| Secondary Or Not |
Non-secondary |
Operative Standards: API Spec 7API Spec RP7GDrill Collar Specifications: Thread TypeOD / DID / dLength /L mmmminMminNC26-3588.93 1/231.81 1/29150NC35-47120.74 3/450.829150NC46-62(4IF)158.86 1/471.42 13/169150 or 9450NC46-65(4IF)165.16 1/257.22 1/49150 or 9450NC50-70(41/2IF)177.8771.42 13/169150 or 9450NC56-80 65/8REG203.2871.42 13/169150 or 9450NC61-90 75/8REG228.6971.42 13/169150 or 9450