Categories: HDD Series, Roller Cones(Thirds)
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| Application | Hard formations with high compressive strength, such as sandstone, hard shale, dolomite, hard gypsum, chert, granite, etc. | ||
1>Cone-diameter of 8 1/2″ tricone bits is 133 mm;
2>Steel raw materials 15CrNiMo for the arm and 15MnNi4Mo for the cone;
3>The metal-face sealed bearing make the working life is extremely long which supports to finish drilling at one time.
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