number drill · nominal diameter

#47
drill bit size.

A #47 bit measures 0.0785 in across (1.994 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#47 · number

0.0785 in

1.994 mm

Designation#47number

Inch decimal0.0785nominal

Metric conversion1.994millimetres

Where this size sits from 0 to 1 inch

#47 · 1.994 mm on a zero to 25.4 millimetre scale. Neighbor marks: 2 mm, 5/64.

0 25.4 mm

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Where this bit is specified

What #47 is for.

#47 is the cutting-tap drill for the thread below— usually the reason this size gets looked up. Engagement is calculated from the basic 60° profile; open a thread for its published row, evidence, and limits.

Cutting-tap rows naming #47 CUT TAPS ONLY · CALCULATED ENGAGEMENT

#3-48 UNC UNC · rule-of-thumb row 75.7% calculated thread engagement

Measured neighbors

What sits beside #47.

“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

2 mmmetric 0.0787 inΔ +0.006 mm 5/64fractional 0.0781 inΔ -0.010 mm 1.9 mmmetric 0.0748 inΔ -0.094 mm 2.1 mmmetric 0.0827 inΔ +0.106 mm

Same seriesNEAREST NOMINAL ROWS

#46number 2.057 mmΔ +0.063 mm #48number 1.930 mmΔ -0.064 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

#47drill bit size.

What #47 is for.

What sits beside #47.

ASME.

#47
drill bit size.