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8 1/2" YHA627 is part of Core Barrel Roller Bit,The single roller bit is used as an accessory, which is installed on the barrel drill alternately. It is mainly used in the pile foundation construction of municipal bridges and buildings, and is mostly used in coastal areas.
| Type | Cutting Structure | ||||
| Insert row | Insert Shape | No of insert | Diameter | Exposed height | |
| 8 1/2" YHA627 | Outer | Conical | 14 | 14 | 7.6 |
| Inner | Conical | 33 | 14 | 10 | |
| Top | Conical | 5 | 14 | 10 | |
| Type | Hardness/Mpa | Formation |
| 8 1/2" YHA627 | 50～120 | Medium and slightly weathered granite, basalt, quartz porphyry, tuff, conglomerate, etc. Medium and high hard compressive strength formations, strong formation homogeneity, high/medium and low abrasive formations. |
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