What are the sizes of collimation screws on Current-production Celestron optical tubes?

When you need to replace your collimation screws, please use the below for a refence of which screws to use:

 

Schmidt-Cassegrain Optical Tubes:

Optical Size Thread Specifications Length
C5 M3 x 0.5 10mm
C6 M3 x 0.5 10mm
C8 M3 x 0.5 8mm
C9.25 M3 x 0.5 10mm
C11 M3 x 0.5 12mm
C14 N/A N/A

 

 

EdgeHD Optical Tubes:

Optical Size Thread Specifications Length
8" M3 x 0.5 12mm
9.25" M3 x 0.5 10mm
11" M3 x 0.5 12mm
14" M3 x 0.5 18mm