Tap Metric Conversion Tables

Millimeter Size to Inches Select a metric size
Size Millimeter	Size Inches	Basic Tap Blank Size
M1 M1.5 M1.6 M1.8 M2 M2.2 M2.3 M2.5 M2.6 M3 M3.15 M3.5 M4 M4.5 M5 M5.5 M6 M6.3 M7 M8 M9 M10 M11 M12 M12.5 M13 M14 M15 M16 M17 M18 M19 M20 M22 M23 M24 M25 M26 M27 M28 M30 M32 M33 M34 M36 M38 M39 M40 M42 M44 M45 M46 M48 M50 M52	.03937	0

Millimeter Pitch to Threads Per Inch Select a metric pitch
Pitch in Millimeters	Pitch in Inches	Threads Per Inch	Basic Thread Height
0.35 0.4 0.45 0.5 0.6 0.7 0.75 0.8 0.9 1 1.25 1.5 1.75 2 2.5 3 3.5 4 4.5 5 6	.01378	72.57	.00895