LF-型吊鉗
LF型吊鉗是石油鉆井作業中用于鉆井起下鉆時擰緊或卸開鉆桿、鉆桿接箍、接頭、套管或套管接箍的工具。可通過更換扣合器鉗，變換各扣合臺肩來改變扣合尺寸。根據不同的扣合尺寸確定扭矩等級。
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技術參數
| 扣合鉗號 No.of Latch Lug jaw | 扣合臺肩 Latch step | 扣合管徑范圍 Size Range(mm(in)) | 額定扭矩 Rated TorquekN·m | |
| in | mm | |||
| 1# | 1 | 2.3/8-2.7/8 | 60.32-73 | 22 |
| 2 | 2.7/8-3.1/2 | 73-88.9 | ||
| 2# | 1 | 3.1/2-4.1/4 | 88.9-107.95 | |
| 2 | 4.1/4-5 | 107.95-127 | ||
| 3# | 1 | 4.3/4-5.1/2 | 120.65-139.7 | |
| 2 | 5.1/2-6.1/4 | 120.65-139.7 | ||
| 4# | 1 | 5.3/4-6.3/8 | 146.05-161.93 | |
| 2 | 6.3/8-7 | 161.93-177.8 | ||
