Основные типы резьб по API — ГОСТ
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| Отечественная | Фирменная 7API | Номерная 7API |
| З-65 | - | NC-23 |
| З-66 | 2 3/8 Reg | - |
| З-73 | 2 3/8 IF | NC-26 |
| З-86 | - | NC-31 |
| З-88 | 3 1/2 Reg | - |
| З-95 | - | NC-35 |
| З-101 | 3 1/2 FH | - |
| З-102 | 3 1/2 IF | NC-38 |
| З-108 | 4 FH | NC-40 |
| З-117 | 4 1/2 Reg | - |
| З-121 | 4 1/2 FH | - |
| З-122 | 4 IF | NC-46 |
| З-133 | 4 1/2 IF | NC-50 |
| З-140 | 5 1/2 Reg | - |
| З-147 | 5 1/2 FH | - |
| З-149 | - | NC-56 |
| З-152 | 6 5/8 Reg | - |
| З-163 | NC-61 | |
| З-171 | 6 5/8 FH | - |
| З-177 | 7 5/8 Reg | - |
| З-185 | NC-70 | |
| З-201 | 8 5/8 Reg | - |
| З-203 | NC-77 |