Bicentric bits for drilling with simultaneous reaming of well shaft

Dimension acc. to new nomenclature Drift diameter, mm Diameter of reaming, mm Max. diameter of near-bit tool, mm Code IADC Coupling thread Dimension acc. to old nomenclature GOST 28487-90 API 7 85/92/76 Â 513 85 92 76 S333 Ç-66 23/8 Reg BIT4-85/92 ÌÑ 114,3/132/95 Â 413 114,3 132 95 S333 Ç-76 27/8 Reg BIT4-114,3/132 ÌÑ 114,3/146/80 Â 508 114,3 146 80 S343 Ç-66 23/8 Reg BIT4-114,3/146 ÌÑ 120,6/126/106 Â 213 120,6 126 106 S333 Ç-76 27/8 Reg BIT4-120,6/126 ÌÑ 120,6/132/106 Â 413 120,6 132 106 S333 Ç-76 27/8 Reg BIT4-120,6/132 ÌÑ 120,6/141/95 Â 513 120,6 141 95 S333 Ç-76 27/8 Reg BIT4-120,6/141 ÌÑ 120,6/142,8/95 Â 413 120,6 142,8 95 S333 Ç-76 27/8 Reg BIT4-120,6/142,8 ÌÑ 152,4/175/127 Â 813 152,4 175 127 S333 Ç-88 31/2 Reg BIT4-152,4/175 ÌÑ

• 120,6/126/106 B 213 H
• 114,2/132/95 B 413 H
• 120,6/141/95 B 513 H