Smoother Extending And Retracting SMB
has better extending and retracting reliability with fewer performance troubles do to simultaneous wing bits support
| Type | Two Wing | Three Wing | Bit Gauge | Applicable Casing Pipe | Device O. D. D4. | Hammer Size | *1 | *2 | *3 | *4 | *5 | |||||
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| Extended D1 | Retracted | Max. O. D. D2. | Min. I. D. D3. | Nominal Size | ||||||||||||
| mm | in.m | mi | n. | mm | mm | in.m | m | in. | ||||||||
| 90 | a | 125 | 4.92 | 91 | 3.58 | 114.3 | 102.3 | 4" | 92 | 3" |  |
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| 115 | a | 152 | 5.98 | 114 | 4.49 | 141.3 | 126.6 | 5" | 115 | 4" | |
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| 140 | a | 185 | 7.28 | 140 | 5.51 | 165.2 | 153.2 | 6" | 141 | 5" | |
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| 165 | a | 215 | 8.46 | 166 | 6.54 | 190.7 | 178.7 | 7" | 167 | 6" | |
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| 187 | a | 237 | 9.33 | 186 | 7.32 | 216.3 | 202.3 | 8" | 187 | 6" | |
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| 215 | a | a | 272 | 10.71 | 217 | 8.54 | 254 | 241 | 9" | 218 | 8" | |
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| 240 | a | 290 | 11.42 | 232 | 9.13 | 273.1 | 254.5 | 10" | 240 | 8" | |
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| 280 | a | 340 | 13.39 | 281 | 11.06 | 318.5 | 301.7 | 12" | 283 | 10" | |
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| 315 | a | 373 | 14.69 | 314 | 12.36 | 355.6 | 336.6 | 14" | 316 | 12" | |
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| 365 | a | 425 | 16.73 | 363 | 14.29 | 406.4 | 387.4 | 16" | 365 | 12" | |
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| 410 | a | 478 | 18.82 | 412 | 16.22 | 457.2 | 435 | 18" | 414 | 15" | |
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| 460 | a | 530 | 20.87 | 461 | 18.15 | 508 | 482.6 | 20" | 463 | 15" 18" | |
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| 510 | a | 580 | 22.83 | 509 | 20.04 | 558.8 | 533.4 | 22" | 511 | 15" 18" | |
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| 560 | a | 630 | 24.8 | 559 | 22.01 | 609.6 | 584.2 | 24" | 561 | 18" | |
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| 600 | a | 685 | 26.97 | 600 | 23.62 | 660.4 | 631.8 | 26" | 603 | 20" | |
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