Manual Tongs for Well Drilling and Servicing
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The manual tongs for well drilling and servicing are also called well servicing tongs or well drilling tongs. They are intended to load or unload drilling tools and casings during workover or oil drilling operation, and they could be adjusted to fit for different pipes and casings by replacing latch lug jaws and handling shoulders.
Standard of Manual Tongs
1. API Spec 7K: Specification for Drilling and Well Servicing Equipment
2. SY/T 5035: National Standard for Petroleum and Gas Industry: Elevator Links, Elevators and Tongs
| Model | No. of latch lug jaw | Gripping range | Max. torque (kN·m) | |
| inch | mm | |||
| 3a | 23/8-41/2 | 60.3-114.3 | 35 | |
| 3b | 41/2-61/2 | 114.3-165.1 | ||
| 3c | 61/2-85/8 | 165.1-219.1 | ||
| 3d | 95/8-103/4 | 244.5-273.1 | ||
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