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  1. #1
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    Where to buy outboard mounting bolts- 316 Stainless and Brass Locknuts.

    Any good ideas on where to order sets for mounting my motors? I'll probably buy a quantity of 50 or 100 so I don't need to look around again, the local places are either insanely priced or they're not offering anything. Thanks.

  2. #2
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    McMaster Carr, Parker Merrick in Fort Lauderdale........
    "One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .

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  4. #3
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    And you want Silicon Bronze nuts, not brass
    "One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .

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  6. #4
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    Will hit Parker Merrick Thursday afternoon on the way to MIA. Thanks.

  7. #5
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    but dont use 316 for a V8 or racing anything offshore

  8. #6
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    Parker Merrick can't get them, said that none of their vendors make them. You'd think in south Florida, which I'm willing to go anywhere from Daytona to Miami- someone would have them in stock.

  9. #7
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    Quote Originally Posted by powerabout View Post
    but dont use 316 for a V8 or racing anything offshore
    304? Is the 316 too soft? I'm putting big 4 strokes on a 27 Magnum, and some 250XS Opti's on a 30' Flight Cat.

  10. #8
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    I assisted Chris Marsh in getting his stainless fastener business going, back in the early 90's. He lived on a boat to get started, so he could afford to jump start his little startup business. He's always been in Jupiter. Good guy. He's sorta close to you. Give him a shot. If he doesn't have it on the shelf, ask him if he can get them. www.MarshFasteners.com Preferably, you want 1/2-20 fine-thread 18-8 stainless hex bolts & brass NyLoc 1/2-20 nuts...and both regular stainless flat washers AND 1/2'' AN washers. We always pushed the bolts through from the back side of the outboard bracket, with double S.S. AN washers, with a bit of TefGel on the threads. Large S.S. flats on the inside. Never tighten the bolt. Only tighten the nut, with the help of an assistant. Turning the bolt ruins the caulking/sealant you also sealed the bolt hole with. Double bolting(two bolts at the upper end of the O/B bracket) isn't a bad idea, its up to you. Surprised Parker-Merrick didn't have what you needed, I bought all this stuff from them for decades. Mercury also sells 1/2"-20 stainless bolts & brass/silicone bronze Nyloc nuts/washers, don't forget...Hope this helps

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  12. #9
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    Quote Originally Posted by FUJIMO View Post
    I assisted Chris Marsh in getting his stainless fastener business going, back in the early 90's. He lived on a boat to get started, so he could afford to jump start his little startup business. He's always been in Jupiter. Good guy. He's sorta close to you. Give him a shot. If he doesn't have it on the shelf, ask him if he can get them. www.MarshFasteners.com Preferably, you want 1/2-20 fine-thread 18-8 stainless hex bolts & brass NyLoc 1/2-20 nuts...and both regular stainless flat washers AND 1/2'' AN washers. We always pushed the bolts through from the back side of the outboard bracket, with double S.S. AN washers, with a bit of TefGel on the threads. Large S.S. flats on the inside. Never tighten the bolt. Only tighten the nut, with the help of an assistant. Turning the bolt ruins the caulking/sealant you also sealed the bolt hole with. Double bolting(two bolts at the upper end of the O/B bracket) isn't a bad idea, its up to you. Surprised Parker-Merrick didn't have what you needed, I bought all this stuff from them for decades. Mercury also sells 1/2"-20 stainless bolts & brass/silicone bronze Nyloc nuts/washers, don't forget...Hope this helps
    Chris was a no-go on the brass lock nuts. Thanks and I really appreciate the help. I agree with what you're saying, but finding this stuff is a crazy task. The 1/2 20 fine threads are the proper set up. Finding them is a different story.

  13. #10
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    Quote Originally Posted by HeavyDuty View Post
    Chris was a no-go on the brass lock nuts. Thanks and I really appreciate the help. I agree with what you're saying, but finding this stuff is a crazy task. The 1/2 20 fine threads are the proper set up. Finding them is a different story.
    You will pay the most for them, but...Mercury has them. Can be ordered from any Mercury/MerCruiser dealer. If memory serves, they offer 6'' & 4" fine thread hexers, plus the brass nylocs, PLUS...the nicer thick s.s. flat washers.

  14. #11
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    Friends with any local center-console boat builders, that are always rigging large outboards? Ask them where they source them. If not...just pick one & cold call them. Ask for purchasing. Get creative...& tell them you have one of they're older boats that your restoring/repowering and how much you love this old boat, blah, blah, blah...You'd be surprised how helpful some of them can be, lol.
    Last edited by FUJIMO; 10-15-2015 at 12:31 PM.

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  16. #12
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    ebay has most everything in stainless steel 18-8, 316


    Click image for larger version. 

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  18. #13
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    Errol Lanier is using the silicon brass 1/2 20's with stainless bolts. I don't need anywhere near 6" and 4" bolts. I'm onto a source now for the silicon brass, but probably takes more than a couple days for replies etc. Thanks Fujimo!

  19. #14
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    Allison boats has them.
    Dave Hensley


    1986 XR2002 /12" Mariner and string steering
    1987 XB 2002 JACO record boat
    1989 XR2002/15" 260
    2004 XB-21/250 Pro XS Sport
    18' Pugh Hydro


    Several Mercury HiPo motors

    2012 200XS ROS ​
    1997 260 w/ blue SVS
    2005 280 SS
    2005 300 Drag drop on
    2003 280 20"
    2005 Drag Drop on For Sale
    2003 250 XS Sport
    2005 300X

  20. #15
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    McMaster-Carr has 18-8, 306, 304 etc and the silicon bronze nuts
    "One of the penalties for refusing to participate in politics is that you end up being governed by your inferiors". Plato .

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