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Small HP Outboard clamp, what is it made of?

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  • Small HP Outboard clamp, what is it made of?

    I have both OMC and Yamaha 9.9 HP 2 cycl outboard engines mounted on aluminum fishing boats. Give I have been told never to use any steel hardware on an aluminum boat (not any pressure treated lumber either) I wonder what the clamp on such engines is made of. I know the clamps look to have steel threads, but maybe the clamp ends are aluminum, and if so the clamp thread must be stainless steel if it is to live with aluminum ends/clamp-faces.

    Then there is the question of the large contact area of the clamp that pushes up against the rear of the transom, is the whole clamp stainless, or is it some hardened aluminum. I recall it is possible to make aluminum strong enough to be the block of an automobile engine - so I suppose there is a form of aluminum strong enough to carry the load of an outboard engine.

    I think I have seen engines as large as 150 HP hung on a transom without the use of a transom jack to mount the engine on.

  • #2
    Re: Small HP Outboard clamp, what is it made of?

    The screw attachment clamps are normally SS with an aluminum handle. SS is fine for an Aluminum boat and be sure to seal all boats through the aluminum with a sealant such as 5200
    This is a great link to boat specifications http://boatspecs.iboats.com/
    Please, shop iboats first!!


    • #3
      Re: Small HP Outboard clamp, what is it made of?

      A handful of anodes won't hurt things either...
      The world takes on a whole new perspective when viewed from 100’ below.
      1972 Bertram ‘Bahia Mar’ 20
      2006 Mercruiser 4.3MPI (0W617679) w/Alpha One Gen II (0W829301)
      (Original - 1972 '165' In-line 6. Previous - 1994 4.3LX)


      • #4
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        Re: Small HP Outboard clamp, what is it made of?

        Most OMCs I've seen have aluminum clamp brackets, aluminum thumbscrews, and aluminum handles. Only thing steel (stainless or otherwise) was the clamp pad itself, and the bolt or clip that held it in place.