Specifications
1.best quality for 3"~26"2.high quality, best price
ver all IADC
Recommended drilling parameters of tri-cone rock bits
Rock formation | Bit type | Bit size | Drilling weight | Rotary speed | ||
mm | inch | kN/mm | r/min | |||
Very soft | Soft Marl, Clays, Sands, Salts etc. | 1 | 187.3~346.1 | 7 3/8~13 5/8 | 441~735 | 120~50 |
soft | Clays, Soft Shale, Marl, Sands, Salts etc. | 2 | 95.2~174.6 | 3 3/4-6 7/8 | 245-490 | 100-50 |
187.3~346.1 | 7 3/8-13 5/8 | 490-784 | 90-40 | |||
Medium soft | Shale, Marl, Sandstone, Soft Limestone etc. | 3 | 95.2~174.6 | 3 3/4-6 7/8 | 245-490 | 80-40 |
187.3~311.1 | 7 3/8- 12 1/4 | 490-784 | 80-40 | |||
medium | Hard Shale, Limestone, Medium/Hard Sandstone etc. | 4 | 95.2~174.6 | 3 3/4-6 7/8 | 294-539 | 80-60 |
187.3~241.3 | 7 3/8-9 1/2 | 539-833 | 60-40 | |||
medium hard | Hard Dolomite, Limestone, Hard Sandy, Rock etc. | 5 | 95.2~174.6 | 3 3/4-6 7/8 | 294-539 | 80-60 |
187.3~241.3 | 7 3/8-9 1/2 | 539-833 | 60-40 | |||
hard | Sandy, Shale, Quartzite, Hard Dolomite, Hard Sandstone etc. | 6 | 95.~-174.6 | 3 3/4-6 7/8 | 294-539 | 80-40 |
187.3-215.9 | 7 3/8-8 1/2 | 580-882 | 60-40 | |||
Very hard | Quartzite, Chert, Basalt Granites, Pyrites etc. | 7 | 95.2-174.6 | 3 3/4-6 7/8 | 294-539 | 80-40 |
Bearing type:sealed bearing and non-sealed bearing
metal sealed journal bearing
rubber sealed journal bearing
cutting structure:The back cone and the teeth all surface is are hardfaced strengthening, improved steel tooth shape and welding materials,showing teeth higher
Application formation:Soft with low compressive strength and high drillability, such as shale, clay, salt bed and etc
