ISO (International Standards Organisation) Metric Special Pitches 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
1.7 0.35 1.321 1.27 1.35 mm
(0.0531 inch)
2 0.45 1.513 1.448 1.55 mm
(0.0610 inch)
2.3 0.4 1.867 1.809 1.9 mm
(0.0748 inch)
2.6 0.45 2.113 2.048 2.15 mm
(0.0846 inch)
3 0.6 2.35 2.264 2.4 mm
(0.0945 inch)
4 0.75 3.188 3.08 3.2 mm
(0.1260 inch)
5 0.9 4.026 3.896 4.1 mm
(0.1614 inch)
5.5 0.9 4.526 4.396 4.6 mm
(0.1811 inch)
8 0.75 7.188 7.08 7.2 mm
(0.2835 inch)
9 1 7.917 7.773 8 mm
(0.3150 inch)
10 0.75 9.188 9.08 8.8 mm
(0.3465 inch)
10 1 8.917 8.773 9 mm
(0.3543 inch)
12 1 10.917 10.773 11 mm
(0.4331 inch)
12 1.5 10.376 10.16 10.5 mm
(0.4134 inch)
14 1.5 12.376 12.16 12.5 mm
(0.4921 inch
16 1 14.917 14.773 15 mm
(0.5906 inch)
20 1 18.917 18.773 19 mm
(0.7480 inch)
20 2 17.835 17.546 18 mm
(0.7087 inch)
24 1 22.917 22.773 23 mm
(0.9055 inch)
24 1.5 22.376 22.16 22.5 mm
(0.8858 inch)
25 1.5 22.376 23.16 23.5 mm
(0.9252 inch)
32 1.5 30.376 30.16 30.5 mm
(1.2007 inch)

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