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Roschen Global
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7 1/2inch IADC216
ROSCHEN
ROS-ST-191
Product Description
Milled Steel Teeth Tricone Bits 7 1/2inch IADC216
Product description:
Mill tooth tricone bits are used in soft rock formations. The protruding teeth are widely spaced to prevent getting clogged with material as they cut through the surface material. Tungsten carbide insert (TCI) tricone bits are used for medium and hard rock formations. These bits are designed with smaller teeth, which are more closely arranged together. Drill speeds are higher when the rock face is harder and TCI can withstand the heat generated from these conditions. Mud is pumped down the drill string and out through the tricone bit to keep the bit clean from cuttings and to move these cuttings back to the surface.
Tricone Bits with Steel Milled Teeth 7 1/2inch IADC216
Code No. | ROS-ST-191 |
Diameter | 7 1/2'' / 191mm |
Pin Type Dimensions | 4 1/2'' API |
Teeth Type | Steel milled |
IADC No | 216 |
Open Bearing Steel Tooth Tricone Bit
ROSCHEN experience over the last three decades has led to many improvements on this classic bit including our current design, which utilizes field-proven technologies, quality materials, and superior machining and heat treating processes. The result is a precision, high-value bit that produces consistent, lowest-cost-per-foot-drilled results.
Steel milled teeth Tricone drill Bits or Roller Cone 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 |
Features:
1. Silver plated journal bearings
2. Silver plated thrust and nose washers
3. Pressure compensating grease reservoir
4. Premium synthetic rock bit lubricant optimized for tolerances
5. Specifically designed tungsten carbide insert package
6. Back ream inserts included
7. Compact spacing of inserts provide increased durability for the toughest formations
8. Premium Hard facing Tungsten Carbide provides a tough long lasting coating on Tooth Bits
