Search results
This chart shows the diameters of number gauge drills size 80 (the smallest) to size 1 (the largest).
They are commonly used to drill lathe centres and spotting drills, i.e.marking holes to guide twist drilling. The drill size chart below contains all commonly used centre drill bit sizes.
The drill size chart provides a list of standard size drill bits in several measurement systems, including fractional, metric, wire gauge number, and letter. The decimal equivalents of the diameters are shown in both English and Metric units.
Fractional sizes are measured in inches, while metric sizes are measured in millimeters. The drill size chart contains twist drill data for up to 1.0 inches in diameter. For typical mechanical tolerances that are achievable see: Drilling Tolerances Capabilities Chart. ANSI Size Drill Bit Chart.
9 wrz 2018 · The drill size chart below contains imperial and metric drill bit diameter measurements for all number and letter gauges.
Number : Fraction : Decimal : Metric size : Size: Size: inches: mm: 1: 0.228: 5.80: 2: 0.221: 5.60: 3: 0.213: 5.40: 4: 0.209: 5.30: 5: 0.206: 5.20: 6: 0.204: 5.20: 7: ...
Number and letter sizes of drills - with decimal equivalents* *Sizes starting with No. 80 and going up to 1 inch. This table is useful for quickly determining the nearest drill size for any decimal, for root diameters, body drills, etc.
