Bill wrote:
I have a 1996 Mariner 50hp 4 stroke motor. The prop has the following
numbers 48 827312A10 10.5P I believe the last set of numbers (10.5) is
the pitch. Is there anyway to tell what the diameter is with these
numbers?

Thanks

As this is the OEM Mercury Black Max part number, it was originally a
10-1/2" pitch x 11-5/8" diameter. It may have been modified since then
if you are not familiar with it's history.

Rob