Metric Screws
From: https://rollestonshed.wordpress.com/books/screw-diameter-chart/

• Gauge To MM Conversion
• Gauge Sizes
• Common Diameter/Pitch
• Another Common Diameter/Pitch
• Metric Thread Sizes
• Non Metric UNC UNF UNEF With Their MM Sizes
• Metric Tap and Drill Sizes
• Metric Coarse Diameter/Pitch
• Diam/Pitch metric Fine Thread
• Metric Thread Sizes

Screw Diameter Chart


Gauge to Millimetre Conversion Chart
Self Tapping


Screw Gauge
(g)
Size
(mm)
2
2.2
3
2.5
4
2.9
5
3.2
6
3.5
7
3.8
8
4.2
9
4.5
10
4.8
12
5.5




Guage Sizes




Non metric screw chart for, 
UNC, UNF, UNEF, with their mm sizes




Metric-tap-and-drill-sizes

Tap
Metric Drill
US Drill
3mm x 0.5 
2.5mm 
–
4mm x 0.7 
3.4mm 
–
5mm x 0.8 
4.3mm 
–
6mm x 1.0 
5.2mm 
–
7mm x 1.0 
6.1mm 
15/64″
8mm x 1.25 
6.9mm 
17/64″
8mm x 1.0 
7.1mm 
–
10mm x 1.5 
8.7mm 
–
10mm x 1.25 
8.9mm 
11/32″
10mm x 1.0 
9.1mm 
–
12mm x 1.75 
10.5mm 
–
12mm x 1.5 
10.7mm 
27/64″
14mm x 2.0 
12.2mm 
–
14mm x 1.5 
12.7mm 
–
16mm x 2.0 
14.2mm 
35/64″
16mm x 1.5 
14.7mm 
–

Drill sizes are for 75% depth of thread.



Table 1 Diameter/Pitch of Commonly Used 
Metric Coarse Threads




Table 2 Diameter/Pitch of Commonly Used 
Metric Fine Threads




Table 3 Metric Thread Sizes Chart