IADC Dull Grading Chart - KC Bit - KC Bit & Supply, LLC
N – Not able to grade 'X' indicates fixed cutter. 6. Gauge – Gauge measures the amount of gauge wear a drill bit has suffered. I- In Gauge 1 – 1/16' out of gauge 2 – 1/8' out of gauge 4 – 1/4' out of gauge. 7. Other Dull Characteristics – Any other dull grading characteristics should be noted here using the codes from #3. 8.
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