number drill · nominal diameter

#37
drill bit size.

A #37 bit measures 0.1040 in across (2.642 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#37 · number

0.1040 in

2.642 mm

Designation#37number

Inch decimal0.1040nominal

Metric conversion2.642millimetres

Where this size sits from 0 to 1 inch

#37 · 2.642 mm on a zero to 25.4 millimetre scale. Neighbor marks: 2.6 mm, 2.7 mm.

0 25.4 mm

Show calibrated outline Open in Finder

Measured neighbors

What sits beside #37.

“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

2.6 mmmetric 0.1024 inΔ -0.042 mm 2.7 mmmetric 0.1063 inΔ +0.058 mm 7/64fractional 0.1094 inΔ +0.137 mm 2.5 mmmetric 0.0984 inΔ -0.142 mm

Same seriesNEAREST NOMINAL ROWS

#38number 2.578 mmΔ -0.063 mm #36number 2.705 mmΔ +0.063 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

#37drill bit size.

What sits beside #37.

ASME.

#37
drill bit size.