Bicycle Screw Thread DIN 79012

Different threads emerged from developments in bicycle production, many of them are from the late 19th or early 20th century, partly from the US or Great Britain, which is the reason why inch dimensions are still in use until today.
The flank angle is 60°.

Thread Size
mm
Major
Diameter
mm
Tapping
Drill Size
mm
TPI
 
Pitch
mm
Fg 2 2.096 1.613 56 0.454
Fg 2.3 2.299 1.816 56 0.454
Fg 2.6 2.604 2.121 56 0.454
Fg 6.35 6.350 5.310 26 0.977
Fg 7.9 7.938 6.898 26 0.977
Fg 9.5 9.525 8.485 26 0.977
Fg 14.3 14.288 12.934 20 1.270
Fg 25.4 25.400 24.272 24 1.058
Fg 32.8 32.766 31.638 24 1.058
Fg 34.8 34.798 33.670 24 1.058