[C320-list] Set Screws for Cutlass Bearing

[Kaare Wold]

Mr. Heyman's suggestion to stick with similar materials is correct to try to 
match the set screw metal with the strut metal.  It is difficult to 
determine the exact analysis of the bronze as it comprises of a broad family 
of alloys.  Silicon bronze is a low grade bronze and easy to cast, but  has 
low mechanical properties..  Manganese bronze is much tougher and is 
commonly used for marine applications.  I agree that I would attempt to 
match the screw material to the strut.  The trick is to find bronze screws.
Kaare Wold
Sheet Music #945


----- Original Message ----- 
From: "Bruce Heyman" <bruceheyman at cox.net>
To: <C320-List at Catalina320.com>
Sent: Tuesday, April 23, 2013 11:18 PM
Subject: Re: [C320-list] Set Screws for Cutlass Bearing


>I thought the struts are bronze so I would have thought the set screws 
>would be bronze as well.  Below the water line it is usually manganese 
>bronze as opposed to silicon bronze.
>
> It should be pretty hard to strip the threads of a stainless steel set 
> screw in manganese bronze because the stainless is so much harder.  When 
> replacing the set screw I would recommend that you do not go with 
> dissimilar metals if you can avoid it.
>
> Bruce Heyman
> (949) 289-8400
>
> Bruce Hunter <swampcreek42 at yahoo.com> wrote:
>
>>Take the good one and go to Ace Hardware, they have a board that has 
>>different threaded bushings that will tell you the size and thread and if 
>>it's metric or SAE. If you stripped out the set screw thats no problem but 
>>if you stripped out the strut you might have to drill and tap it out to 
>>the next size up. I'm not sure what material the set screw is but I would 
>>bet that it is stainless steel and thats what I would replace it with.
>>
>>Bruce
>>Nauti Time #719
>>
>>From: Tim <chillinonahd at yahoo.com>
>>To: "C320-List at Catalina320.com" <C320-List at Catalina320.com>
>>Sent: Tuesday, April 23, 2013 7:56 PM
>>Subject: [C320-list] Set Screws for Cutlass Bearing
>>
>>
>>Hi All -
>>
>>Does anyone know the size of these little guys and if they are stainless 
>>steel or not? Stripped one during removal and need to replace. I called 
>>Catalina Direct but without knowing the size they could not help me.
>>
>>Thx !
>>
>>Tim
>>Calypso
>>#603
>