ISO (International Standards Organisation) Metric Fine Threads

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Angle of Thread = 60o Degrees
Diameter
mm		 Pitch
mm		 Root Diameter
Internal Threads		 Root Diameter
External Threads		 Tapping Drill Size
3 0.35 2.621 2.57 2.65 mm
(0.1043 inch)
4 0.5 3.459 3.387 3.5 mm
(0.1378 inch)
5 0.5 4.459 4.387 4.5 mm
(0.1772 inch)
6 0.75 5.188 5.08 5.2 mm
(0.2047 inch)
7 0.75 6.188 6.08 6.2 mm
(0.2441 inch)
8 1 6.917 6.773 7 mm
(0.2756 inch)
10 1.25 8.647 8.466 8.5 mm
(0.3346 inch)
12 1.25 10.647 10.466 10.8 mm
(0.4252 inch)
14 1.25 12.647 12.466 12.8 mm
(0.5039 inch)
16 1.5 14.376 14.16 14.5 mm
(0.5709 inch)
18 1.5 16.376 16.16 16.5 mm
(0.6496 inch)
20 1.5 18.376 18.16 18.5 mm
(0.7283 inch)
22 1.5 20.376 20.16 20.5 mm
(0.8071 inch)
24 2 21.835 21.546 22 mm
(0.8661 inch)
27 2 24.835 24.546 25 mm
(0.9843 inch)

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