FKSeries
Air Cooling Roller Bearing Bit
FK Series Tricone Bit Diameter from 7 7/8-12 1/4 inch,IADC Code from 412 to 732.| Bit Size | Bit type | |
| inch | mm | |
| 8 1/2 | 215.9 | FK522G,FK532G,FK542G,FK622G,FK632G.FK732G |
| 9 | 228.6 | FK522G,FK532G,F542G,FK622G,FK632G.FK732G |
| 9 7/8 | 250.8 | FK522G,FK532G,F542G,FK622G,FK632G.FK732G |
| 12 1/4 | 311.2 | FK522G,FK532G,F542G,FK622G,FK632G.FK732G |
| IADC | Recommendation | Applicable Formation | |
| WOB | RPM | ||
| 512 | 0.35～0.7 | 120～60 | Soft formations with low compressive strength and high drillability, such as mudstone, gypsum, salt, soft shale, soft limestone, etc. |
| 542 | 0.4～0.8 | 100～60 | Soft to medium formations with low compressive strength, such as medium soft shale, medium soft limestone, medium soft sandstone, medium formation with harder and abrasiver interbed, etc. |
| 612 | 0.5～0.9 | 100～60 | Medium hard formations with high compressive strength, such as hard shale, limestone, sandstone, dolomite, etc. |
| 732 | 0.6～1.1 | 90～50 | Medium to high abrasive hard formations, such as hard shale, hard limestone, sandstone, whinstone, flintstone, granite, quarts sandstone, hard dolomite, hard limestone, pyrite, etc. |
