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Old 05-07-2013, 09:58 PM   #1
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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.

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Old 05-07-2013, 10:18 PM   #2
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Fastening to 1/8" steel


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

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Old 05-07-2013, 10:33 PM   #3
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Fastening to 1/8" steel


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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.
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Old 05-07-2013, 10:38 PM   #4
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Fastening to 1/8" steel


try finding a longer, bigger version of these. http://www.bestmaterials.com/detail.aspx?ID=17171
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Old 05-08-2013, 07:26 AM   #5
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Fastening to 1/8" steel


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?
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Old 05-08-2013, 07:45 AM   #6
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Fastening to 1/8" steel


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----
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Old 05-08-2013, 09:56 AM   #7
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Fastening to 1/8" steel


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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.
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Old 05-08-2013, 02:35 PM   #8
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Fastening to 1/8" steel


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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.
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Old 05-08-2013, 08:20 PM   #9
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Fastening to 1/8" steel


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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.
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Old 05-09-2013, 07:31 AM   #10
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Fastening to 1/8" steel


Just a thought---shackles----no drilling needed---might be a challenge finding ones that don't rust---
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Old 05-09-2013, 11:29 PM   #11
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Fastening to 1/8" steel


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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.
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Old 05-10-2013, 04:28 AM   #12
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Fastening to 1/8" steel


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.
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Old 05-10-2013, 06:56 AM   #13
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Fastening to 1/8" steel


are we talking a lake, or right on the ocean. And no one is going to walk off with your kayak?
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Old 05-10-2013, 08:34 AM   #14
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Fastening to 1/8" steel


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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. Sorry, I couldn't resist
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Old 05-13-2013, 03:40 PM   #15
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Fastening to 1/8" steel


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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