number drill · nominal diameter

#29
drill bit size.

A #29 bit measures 0.1360 in across (3.454 mm).

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

Diameter conversion cross-checked

Calibrated relative diameter · 1 in reference

#29 · number

0.1360 in

3.454 mm

Designation#29number

Inch decimal0.1360nominal

Metric conversion3.454millimetres

Where this size sits from 0 to 1 inch

#29 · 3.454 mm on a zero to 25.4 millimetre scale. Neighbor marks: 3.5 mm, 3.4 mm.

0 25.4 mm

Show calibrated outline Open in Finder

Measured neighbors

What sits beside #29.

“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

3.5 mmmetric 0.1378 inΔ +0.046 mm 3.4 mmmetric 0.1339 inΔ -0.054 mm 9/64fractional 0.1406 inΔ +0.117 mm 3.6 mmmetric 0.1417 inΔ +0.146 mm 3.3 mmmetric 0.1299 inΔ -0.154 mm

Same seriesNEAREST NOMINAL ROWS

#28number 3.569 mmΔ +0.114 mm #30number 3.264 mmΔ -0.191 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

#29drill bit size.

What sits beside #29.

ASME.

#29
drill bit size.