#5 is a M30x3.50.
Lot of Misc Metric Hand Tap NOS M20 X 1.5 M20 X 2.5
EVIL ENERGY 6AN Male Flare to M20 x 1.5mm Metric 6an M20*1.5, Black
A1 M20 X 1.5 20MM LEFT HAND x 1.4" Hex Rethread Die 447-20150 CS LH Metric
M20 x 2.50 LEFT HAND Plug Hand Tap Alfa HTLM81143 20MM x 2.5 HSS 4Flut LH Metric
M20 X 2.5 20MM Plug Hand Tap Morse MT3838015 HSS USA D7 Metric RH 4 Flute
M20 X 1.5 Taper Hand Tap 20MM Morse MT3838165 Starter RH 4 Flute D6 USA Metric
