RUS / ENG
Вид:
я
200.0 412X (7 ⅞" 412)
The bit is designed for drilling of soft abrasive rock formations, e.g. chalk. marl, dolomite, marls limestone and sandstone with aired out cement, volcanic tuff, medium and hard coal, aleurolite and apatite-nepheline ore, coarse-grained marble, quartzeous and micaceous shale, phosphorite and conglomerate of sedimentary rocks, overburden of coal seams, also found in shale mines.
Recommended drilling parameters for maximum efficiency of the bit: low and medium rotation speed (60-115 RPM) and axial load from 30 to 140 kN.
Rock strength range - from 2 000 to 6 000 PSI.
Download technical specifications
-->
Технические характеристики
Bit diameter, mm:
200.0
Bit diameter, inch:
7 ⅞
Bit designation, IADC:
412X
Connection thread, API:
4 ½" REG
Bearing type:
Air-cooled, on rolling bearings
Formation type:
For soft abrasive formations
Rotation speed. RPM:
115-60
Max. applicable load, kN:
30-140
Weight, kg:
32.8
Bearing/cooling type:
Roller – Ball – Roller / Air cooling
Blow-through type:
Side / center
Cutting structure:
Tungsten carbide inserts
-->