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-   -   Fastening to 1/8" steel (http://www.diychatroom.com/f19/fastening-1-8-steel-179041/)

Toller 05-07-2013 08:58 PM

Fastening to 1/8" steel
 
My dock has a perimeter of 1/8" thick steel rectangular tubes. There are 2x10 attached to it with what looks like the 22cal nails used for fastening to concrete. Are they also used to fasten to steel?

I was intending on attaching some large hooks on the 2x10s to hold a kayak, but they aren't particularly well attached. I don't think they are going to fall off, but won't support a kayak.

I want to drill through the 2x10 and attach something to the steel to attach the kayak hooks. Is there a screw or bolt I could use? (no, I don't have access to the inside of the tube) Since it will be a foot above the water, it would have to be rust resistant.

Thanks.

MTN REMODEL LLC 05-07-2013 09:18 PM

How about a SS bolt all the way thru the rectangular tubes??

jagans 05-07-2013 09:33 PM

Quote:

Originally Posted by MTN REMODEL LLC (Post 1174669)
How about a SS bolt all the way thru the rectangular tubes??

MTN Has got it, IMHO. Type 304 or 316 Stainless. 3/8 Minimum. Self locking nuts, SS fender washers.

coupe 05-07-2013 09:38 PM

try finding a longer, bigger version of these. http://www.bestmaterials.com/detail.aspx?ID=17171

Toller 05-08-2013 06:26 AM

A though bolt would certainly be strongest; but I am am only hanging 60 pound kayak, and there would be two hooks, each with three screws; so that might be overkill.

I originally rejected the tek screws because I couldn't find them in SS. (do they exist in SS?) and thought the zinc plated (not galvanized) would rust. The description says they are good for marine use, and I am free water. Will they rust?

oh'mike 05-08-2013 06:45 AM

Plated TEC screws are used on roofs and siding and hold up well---however,on a dock?
Consider drilling and tapping the columns for stainless steel screws---that will be the safest method that I can think of---Mike----

jagans 05-08-2013 08:56 AM

Quote:

Originally Posted by oh'mike (Post 1174865)
Plated TEC screws are used on roofs and siding and hold up well---however,on a dock?
Consider drilling and tapping the columns for stainless steel screws---that will be the safest method that I can think of---Mike----

No, the safest method is to drill all the way through and put a fender washer and a self locking nut on the other side, but apparently the advice of MTN, and myself has fallen on deaf ears.

1/8 inch thick steel is not going to give you enough thread, Mike. The TEK screws he wants to use are high carbon so they can cut. They, or the mild steel tube he wants to use will rust out in no time at all in a marine condition.

They may work for a while though. How tough are Kayaks? Can they take the weight of a PT 2 x 10 falling on them? If they can, no harm done I guess.

Toller 05-08-2013 01:35 PM

Quote:

Originally Posted by jagans (Post 1174957)
the mild steel tube he wants to use will rust out in no time at all in a marine condition.

Only reason I want to use the mild steel tube is that is how the deck was built 20 years ago. Seems silly to spend $25,000 to change it when it seems to be holding up.

jagans 05-08-2013 07:20 PM

Quote:

Originally Posted by Toller (Post 1175110)
Only reason I want to use the mild steel tube is that is how the deck was built 20 years ago. Seems silly to spend $25,000 to change it when it seems to be holding up.

We,(MTN and I, Him First) did not say to change the 1/8 inch tube. We just offered a good way to fasten to it, but do as you please, after all, its your boat. :thumbsup:

oh'mike 05-09-2013 06:31 AM

Just a thought---shackles----no drilling needed---might be a challenge finding ones that don't rust---

Toller 05-09-2013 10:29 PM

Quote:

Originally Posted by oh'mike (Post 1175643)
Just a thought---shackles----no drilling needed---might be a challenge finding ones that don't rust---

Okay, what is a shackle? I googled and the ones that go on chains aren't going to help.

I considered clamps, but decided that was crazy.

oh'mike 05-10-2013 03:28 AM

A shackle is a rod--bent in a C shape---with threaded ends----they are used to attach leaf springs on trucks---attach signs to columns--electrical boxes to posts in factories.

mj12 05-10-2013 05:56 AM

are we talking a lake, or right on the ocean. And no one is going to walk off with your kayak?

jagans 05-10-2013 07:34 AM

Quote:

Originally Posted by mj12 (Post 1176234)
are we talking a lake, or right on the ocean. And no one is going to walk off with your kayak?

Not everybody lives in Detroit. :laughing::laughing::laughing: Sorry, I couldn't resist

peakcelln 05-13-2013 02:40 PM

I just used #10 Teks for the same type tubing, only on my deck. Three #10s across 10" held 450lbs, So I think your 60lb Kayak will be safe. I'd use a 2 1/2" - 3" with a washer, you may have to go to a #12 for that length. I'm pretty sure they only come in Hex. Make sure you tease them in. If there's danger of water seep, I'd use a little waterproof bond and coat the screw top with Rustoleum after its in. Hope this helps.


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