8 1/2 Inch 216mm Concave Coreless Pdc Bit With 5blades

Diamond compact (PDC) coreless bit refers to a bit with diamond compact as cuttingedge, which has the advantages of high strength, high wear resistance and impactresistance. The main categories are: composite bit for geological exploration, which ismainly used for geological exploration and is suitable for soft to medium hard rocklayers; Coalfield drilling adopts composite bit, which is mainly used for coal seam drillingand excavation in coal mines. Generally speaking, the rock stratum in coalfield isrelatively soft, and composite bit is widely used, such as anchor bit and three-wing bit;Composite bit for oil exploration is mainly used in oil and gas field drilling. Composite bitfor oil field has the highest cost and the highest quality requirement among all compositebits, and has different quality requirements and standards at home and abroad.

Product features: concave coreless bit

 suitable for a wide range of formations, drlling speed, price concessions, cost-effective.

APPLICABLE STRATA: According to 12 grades, 1 to 7 grades soft to medium hard strata use (see the following strataclassification table), example: Soil Layer, loose rock layer, weathering layer, shale, medium hard limestone, marble, etc.

Common Specification: Outside diameter 46/55/60/65/75/91/113/133/153/171/200/220/250/280/300/325mm etc.(outside diameter 28/30/32/43)

Common Thread: 42/50/60/73/76/89, all kinds of thread can be customized