#29 Drill Bit

Decimal inches 0.1360″

Millimeters 3.454 mm

System Number (wire gauge)

Nearest equivalents in other systems

System	Nearest drill	Size	Difference
Metric	3.5 mm	0.1378″ / 3.5 mm	+0.046 mm (+0.0018″)
Fractional inch	9/64″	0.1406″ / 3.572 mm	+0.117 mm (+0.0046″)
Letter	A	0.2340″ / 5.944 mm	+2.489 mm (+0.0980″)

Positive difference = cuts a slightly larger hole than #29. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread	Major diameter	Pitch
#8-32 UNC	0.1640″ / 4.166 mm	32 TPI
#8-36 UNF	0.1640″ / 4.166 mm	36 TPI

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

Neighboring number sizes

Drill	Decimal in	mm	vs #29
#31	0.1200	3.048	−0.406 mm
#30	0.1285	3.264	−0.191 mm
#29	0.1360	3.454	—
#28	0.1405	3.569	+0.114 mm
#27	0.1440	3.658	+0.203 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 number size is 0.1360″. See all data sources.