BenchReference

7 mm Drill

Decimal inches 0.2756″
Millimeters 7 mm
System Metric

Nearest equivalents in other systems

System Nearest drill Size Difference
Fractional inch 9/32″ 0.2813″ / 7.144 mm +0.144 mm (+0.0057″)
Number (wire gauge) #1 0.2280″ / 5.791 mm −1.209 mm (−0.0476″)
Letter J 0.2770″ / 7.036 mm +0.036 mm (+0.0014″)
−0.56 mm+0.56 mm7 mm6.8 mm−0.2 mm6.9 mm−0.1 mm7.1 mm+0.1 mm7.2 mm+0.2 mmJ+0.036 mm9/32″+0.144 mm← #1 −1.209 mmtick position = true diameter · metric neighbors above, equivalents below · window ±0.56 mm
Positive difference = cuts a slightly larger hole than 7 mm. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread Major diameter Pitch
M8 × 1 0.3150″ / 8 mm 1 mm

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
M6 × 1 loose

Neighboring metric sizes

Drill Decimal in mm vs 7 mm
6.8 mm 0.2677 6.8 −0.2 mm
6.9 mm 0.2717 6.9 −0.1 mm
7 mm 0.2756 7 —
7.1 mm 0.2795 7.1 +0.1 mm
7.2 mm 0.2835 7.2 +0.2 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 metric size is 7 mm. See all data sources.