BenchReference

29/64″ Drill Bit

Decimal inches 0.4531″
Millimeters 11.509 mm
System Fractional inch

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 11.5 mm 0.4528″ / 11.5 mm −0.009 mm (−0.0004″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −5.718 mm (−0.2251″)
Letter Z 0.4130″ / 10.49 mm −1.019 mm (−0.0401″)
−0.921 mm+0.921 mm29/64″27/64″−0.794 mm7/16″−0.397 mm15/32″+0.397 mm31/64″+0.794 mm11.5 mm−0.009 mm← #1 −5.718 mm← Z −1.019 mmtick position = true diameter · fractional neighbors above, equivalents below · window ±0.92 mm
Positive difference = cuts a slightly larger hole than 29/64″. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
1/2″-20 UNF 0.5000″ / 12.7 mm 20 TPI

The standard chart recommendation (≈75% thread engagement). Application-specific factors — material, hole depth, tap type — can justify a different drill.

Clearance drill for

Thread Fit
7/16″-14 UNC close
7/16″-20 UNF close

Neighboring fractional sizes

Drill Decimal in mm vs 29/64″
27/64″ 0.4219 10.716 −0.794 mm
7/16″ 0.4375 11.112 −0.397 mm
29/64″ 0.4531 11.509 —
15/32″ 0.4688 11.906 +0.397 mm
31/64″ 0.4844 12.303 +0.794 mm
Data provenance. ASME B94.11M, Twist Drills (standard drill size series) (ASME). Machinery’s Handbook — tap drill charts (Industrial Press). Millimeter and inch values are converted with the exact definition 1 in = 25.4 mm; the canonical dimension for this fractional size is 0.4531″. See all data sources.