Originally Posted by 9D280
As DHD says, the "A x B" is "diameter x pitch" - the addition of the dash is down to numerical lingusitics.
I guess the 4 figure number is a part number, assuming the prop is of a ballpark same size as the other two.
I'm ok with the pitch/diameter markings.
It's the one with the 4 digit marking that had me stumped.
I'll try and figure out those instructions!