Thanks for all your replies. I measured it and it's very close to 12".
And yes it is for a pontoon boat.





On Sat, 03 Mar 2007 15:22:22 GMT, Short Wave Sportfishing
wrote:

On Sat, 03 Mar 2007 09:10:36 -0500, trainfan1
wrote:

trainfan1 wrote:

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

Oh, & I hope this is on a pontoon or barge - it's a pretty low pitch for
a 50hp MercMariner.

That's a good point.