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Re: Welp, just sold my last boat for sale................

By: micro in 6TH POPE | Recommend this post (0)
Sun, 25 Oct 20 11:55 AM | 27 view(s)
Boardmark this board | 6th Edition Pope Board 		Msg. 07739 of 60014
(This msg. is a reply to 07729 by Zimbler0)
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ZIm
Just a reminder but I AM a coatings expert as well as a mechanical engineer. I formulate coatings and recommend types and chemistries that work best for particular applications that yuou find in everyday things, such as Windows, doors, garage doors,screws and nuts, (ever hear of Hillman fastener?)automobiles, firepits, grills, etc...

Yep. Not kidding. I also have designed a lot of things in my life found in the military and specified the materials used for those applications and approved by the particular branch's counter parts.

I helped design one of the very first robots used at general motors.

I should have showed you a pic of some 18-8 stainles that was rusted I have been in mnetals my entire life and yes, 18-8 is better but the aluminum would still be a better choice. The strength for SHEAR line breakage is not the issue.. It is vertical and basically a simple hold down.. Because of that, shear line forces are minimal.

That is why I think the aluminum is a SAFER choice in the long run for appearance as well as the function would be acceptable as well.

I don't know about a bad rap. There are plenty of good uses for stainless fasteners where they are the preferred choice and one reason is strength.

Anyway, if it is my boat, and it isn't, I would use some good quality aluminum in that salt water environment.

I am going to agree to disagree with your view and you certianly are entitled to disagree with me. In either event, it is no skin off Nemo's boat as he is the owner and can do anything he pleases with it.. and will.

Interesting perspectives. Good information...

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The above is a reply to the following message:
Re: Welp, just sold my last boat for sale................
By: Zimbler0 in 6TH POPE
Sun, 25 Oct 20 4:21 AM 		Msg. 07729 of 60014

>>>
I have heard that even stainless steel screws will rust.

http://joneakes.com/jons-fixit-database/1483-I-have-heard-that-even-stainless-steel-screws-will-rust

There are interesting stories about most fasteners.

The standard galvanised nails should not be used with Cedar because the tannic acid in cedar will react with the galvanisation. Just as Aluminium nails should not be used with pressure treated wood.

Many new coatings exist that work even better, and are often colour matched to our wood, like green and brown screws. All of these things are coatings put over a regular steel screw.

Stainless steel is by definition a steel (actually a ferrous alloy) that has at least 12% Chromium content. Right, Chrome, like the old bumpers that were Chrome coated. Here they are putting this material mixed right into the steel. Too much chrome and it becomes brittle, too little and it can rust. In fact there are many different formulations of "stainless steel", each designed to work with particular problems, not just water rust.

The standard screw and nail construction stainless steel are called the 300 series, or 18-8 (which means about 18% chromium and 8 % nickel). These are the ones that will not rust. Others which are actually stronger, will be lest resistant to rusting. So part of the "bad rap" on stainless steel is that less expensive but stronger fasteners are being sold for a purpose where they are not appropriate.

For our decking and fencing, we want screws that are labelled 304 or 18-8 (the same screw, just two systems of labelling) or maybe even more corrosion resistance with a 316, but stay away from the 400 series. Some manufacturers do put these identifications on the label as you can see in the photo, while many do not yet. If all the Stainless Steel screws available at your store have no ratings, insist that the store staff check the catalogues to see that what you are buying is in the 300 series or is identified as 18-8. Then they won't rust and stain the fence.

>>>

Interesting subject Boss.

Zim.

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