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Number Drill Size Chart

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Also note that to correct for a broad feeler gauge or a loose fitting drill bit. Values for fractional size wire gauge size letter size metric size and decimal inch size drills.

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Number drill bit gauge sizes range from size 80 the smallest to size 1 the largest followed by letter gauge size a the smallest to size z the largest.

Number drill size chart. The fractions used are always in their simplest form ie. Fraction of an inch inch mm fraction of an inch inch mm fraction of an inch. Please send corrections and comments to.

Eng form last updated on. When using a drill bit for a feeler gauge please remember that many drill bits are actually undersize at the shank end of the drill bit so please use the above bit sizes with a grain of salt. Measurement drill bits come in 164 inch increments.

Drill bit size chart to 14 inch diameter. This chart shows the diameters of number gauge drills size 80 the smallest to size 1 the largest. The drill size chart contains tools up to 15 inches in diameter but larger tools are also commonly used.

The drill size chart below gives fractional sizes and their metric conversions up to 1 inch. The wire gauge and letter systems refer to tool diameters that increase as the wire gauge decreases from 107 to 1 and then continues from a to z. Although the asme b9411m twist drill standard for example lists sizes as small as size 97 sizes smaller than 80 are rarely encountered in practice.

Fractional sizes are measured in inches while metric sizes are measured in millimeters. Reduced as far as possible so 264 becomes 132 for instance. Number size drills diameter in inches.

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Drill Bit Number Chart
Drill Bit Number Chart
Try our mini drill bits. The acronym
Drill Bit Number Size Chart
Drill Bit Number Size Chart
Drill bits also called twist drills are
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