PQ HQ NQ BQ Impregnated Diamantbohrkrone

Features ofChangtan Drill Impregnated Diamond Core Bits Many years of experience combined with recent improvements in technology and manufacturing concepts have resulted in greatly improved drilling performance of impregnated PQ HQ NQ BQ diamond core bits. High quality synthetic diamond powders are distributed in the depth of impregnated diamond core bit's matrix series. The matrix layer of the crown contains a uniform distribution of these crystals that are embedded in a powdered metal bond.The matrix of our impregnated diamond core bits is designed to expose new diamonds to the bits' cutting face as wear occurs. Fast penetration rate is maintained as a result of this action.Our impregnated diamond core bits are manufactured to give optimum penetration rates and bit life, which is required to keep the cost of diamond drilling to a minimum. Core Barrel Designation Core Bit Core Bit Reaming Shell Outside Set Diameter Inside Set Diameter Set Diameter Maximum Minimum Maximum Minimum Maximum Minimum Inches mm Inches mm Inches mm Inches mm Inches mm Inches mm NQ 2.97 75,44 2.96 75.19 1.88 47.75 1.87 47.5 2.985 75.82 2.975 75.57 HQ 3.77 95.76 3.755 95.38 2.505 63.63 2.495 63.38 3.79 96.27 3.775 95.89 PQ 4.815 122.3 4.795 121.8 3.35 85.09 3.34 84.84 4.835 120.81 4.82 122.43 BQ 2.35 59.69 2.34 59.44 1.438 36.52 1.428 36.27 2.365 60.07 2.355 59.82 AQ 1.88 47.75 1.87 47.5 1.067 27.1 1.057 26.85 1.895 48.13 1.885 47.88