On Fri, 02 Mar 07, 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?

My guess.... the 10.5P is definitely the pitch. And the 10 after the A
represents the diameter, although it could mean anything from 10.0 to
10.99 (i.e. 10.25 or 10.50 or 10 5/8).

And I agree with Shorwave, the two best ways to find the diameter are
"measure it" (if odd # blades, measure radius then double it) or ask a
dealer (although I disagree on the order of "bestness) ;-)

Rick