尺寸 英寸 6 6 1/2 7 7/8 8 1/2 9 1/2 9 5/8 9 7/8 mm 152.4 165.1 200.0 215.9 241.3 244.5 250.8 镶齿牙轮钻头 型号(IADC) 钢齿牙轮钻头 517, 537,617, 637 517, 537 517,527,547,617,627,637 437,447,517,537,617,627,637 437,517,537,547,617 437,517, 537,547,617 437,517, 537,547,617 437,517, 537,547,617,627,637 517,537,617,627,637 417,517, 537,547,617,637 417,517, 537,547,617,637 126.127.216.217. 316.346.347 126.127.216.217. 316.346.347 126.127.216.217. 316.346.347 126.127.216.217. 316.346.347 126.127.216.217. 316.346.347 126.127.216.217. 316.346.347 126.127.216.217. 316.346.347 126.127.216.217. 316.346.347 126.127.216.217. 316.346.347 126.127.216.217. 316.346.347 126.127.216.217. 316.346.347 12 1/4 311.1 17 1/2 444.5 24 26 609 660