BenchReference

11/16″ Drill Bit

Decimal inches 0.6875″
Millimeters 17.462 mm
System Fractional inch
In 64ths 44/64″

Nearest equivalents in other systems

System Nearest drill Size Difference
Metric 17.5 mm 0.6890″ / 17.5 mm +0.038 mm (+0.0015″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −11.671 mm (−0.4595″)
Letter Z 0.4130″ / 10.49 mm −6.972 mm (−0.2745″)
−1.397 mm+1.397 mm11/16″21/32″−0.794 mm43/64″−0.397 mm45/64″+0.397 mm23/32″+0.794 mm17.5 mm+0.038 mm← #1 −11.671 mm← Z −6.972 mmtick position = true diameter · fractional neighbors above, equivalents below · window ±1.4 mm
Positive difference = cuts a slightly larger hole than 11/16″. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
3/4″-16 UNF 0.7500″ / 19.05 mm 16 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
5/8″-11 UNC normal
5/8″-18 UNF normal

Neighboring fractional sizes

Drill Decimal in mm vs 11/16″
21/32″ 0.6563 16.669 −0.794 mm
43/64″ 0.6719 17.066 −0.397 mm
11/16″ 0.6875 17.462 —
45/64″ 0.7031 17.859 +0.397 mm
23/32″ 0.7188 18.256 +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 0.6875″. See all data sources.