Sport master prop nut kit.

**Cpines** · 11-28-2016, 10:17 AM

I've got a new sportmaster on a 300 xs. I have been testing props and the nut for the prop shaft is not as firm any longer. I went looking for the prop nut and washers on line and can't seem to find them readily available. Anyone know of an in stock source or a locally sourced substitute?

**Dave Strong** · 11-28-2016, 12:31 PM

Part number is 12-840383A 2, any Merc dealer if not in stock should only be a day or so away. Fullers Marine will have in stock.

Dave

**Cpines** · 11-28-2016, 12:51 PM

Originally Posted by Dave Strong

Part number is 12-840383A 2, any Merc dealer if not in stock should only be a day or so away. Fullers Marine will have in stock.

Dave

Thanks for the info. I found it on Ebay for $37 with that part number. Ordered, one stroke, Done! Thanks again.

**phillnjack** · 11-28-2016, 06:07 PM

can I ask exactly what do you mean by "the nut for the prop shaft is not as firm any longer" ?
do you mean its a locking nut and that the nylon is not gripping ? or is it a metal nut and you've rounded it off /
seems a strange thing to say that its not firm .

**Cpines** · 11-28-2016, 10:13 PM

Originally Posted by phillnjack

can I ask exactly what do you mean by "the nut for the prop shaft is not as firm any longer" ?
do you mean its a locking nut and that the nylon is not gripping ? or is it a metal nut and you've rounded it off /
seems a strange thing to say that its not firm .

It is a nylon locking nut and the nylon has gone soft and no longer gripping firmly.

**wetsetmarine** · 11-29-2016, 05:30 PM

I bought a bag of 25 on ebay for $15.00 shipped. I'll look up the link
http://www.ebay.com/itm/3-4-16-Nylon...item4888f7f9ad

**phillnjack** · 11-30-2016, 02:56 PM

ok now I understand about the not so firm bit.
plenty of better quality lock nuts around than mercury sell, even the normal nyloc are better.
I still think the old castle nuts cant be beat, a good nut would be a nyloc with a castellated top would be the best.

**Davidlake** · 11-30-2016, 05:24 PM

Originally Posted by wetsetmarine

I bought a bag of 25 on ebay for $15.00 shipped. I'll look up the link
http://www.ebay.com/itm/3-4-16-Nylon...item4888f7f9ad

I would be careful using stainless steel nuts on stainless steel prop shaft. Likely to gall one or both, possibly ruining the shaft. That is why the Mercury nut is brass.

**wetsetmarine** · 11-30-2016, 06:37 PM

These are brass...and identical to Mercury! Thanks..I would never go stainless because of galling!

**catfish123** · 12-01-2016, 07:52 AM

Originally Posted by wetsetmarine

These are brass...and identical to Mercury! Thanks..I would never go stainless because of galling!

Here is the response I got about these nuts from the seller................................."They are a gold type of zinc plate on steel." They ARE NOT brass.