number drill · nominal diameter

#7
drill bit size.

A #7 bit measures 0.2010 in across (5.105 mm).

The inch decimal is the published nominal designation; millimetres are a conversion.

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#7 · number

0.2010 in

5.105 mm

Designation#7number

Inch decimal0.2010nominal

Metric conversion5.105millimetres

Where this size sits from 0 to 1 inch

#7 · 5.105 mm on a zero to 25.4 millimetre scale. Neighbor marks: 5.1 mm, #8.

0 25.4 mm

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Measured neighbors

What sits beside #7.

“Nearest” means nominal diameter only. It does not make a neighboring size acceptable for a tolerance, tapping, reaming, or fastener application.

Other naming systemsABSOLUTE DIAMETER DELTA

5.1 mmmetric 0.2008 inΔ -0.005 mm 13/64fractional 0.2031 inΔ +0.054 mm 5.2 mmmetric 0.2047 inΔ +0.095 mm 5 mmmetric 0.1969 inΔ -0.105 mm

Same seriesNEAREST NOMINAL ROWS

#8number 5.055 mmΔ -0.051 mm #6number 5.182 mmΔ +0.076 mm

Source record

ASME.

The standard text is paywalled. Number and letter series are cross-checked against public manufacturer charts; exact standard edition/page verification remains a release gate.

Open source record

#7drill bit size.

What sits beside #7.

ASME.

#7
drill bit size.