#37 Drill Bit

Decimal inches 0.1040″

Millimeters 2.642 mm

System Number (wire gauge)

Nearest equivalents in other systems

System	Nearest drill	Size	Difference
Metric	2.6 mm	0.1024″ / 2.6 mm	−0.042 mm (−0.0016″)
Fractional inch	7/64″	0.1094″ / 2.778 mm	+0.137 mm (+0.0054″)
Letter	A	0.2340″ / 5.944 mm	+3.302 mm (+0.1300″)

Positive difference = cuts a slightly larger hole than #37. Sizes beyond the window are listed with arrows — they are not close substitutes.

Tap drill for

Thread	Major diameter	Pitch
#5-44 UNF	0.1250″ / 3.175 mm	44 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
#1-64 UNC	loose
#1-72 UNF	loose

Neighboring number sizes

Drill	Decimal in	mm	vs #37
#39	0.0995	2.527	−0.114 mm
#38	0.1015	2.578	−0.063 mm
#37	0.1040	2.642	—
#36	0.1065	2.705	+0.063 mm
#35	0.1100	2.794	+0.152 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 0.1040″. See all data sources.