Trucks & Trailers - Best way to screw into galvanized steel - or how to attach crossmember pads

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sandiegosteve
01-20-2010, 03:16 PM
My new boats gives the front cross member a bump when I am loading back onto the trailer.

I've got a crossmember pad that fits on just right. Not I need to attach it.

There are 4 spots to drill it on. What is the best way to screw into steel with relatively small #8/#10 stainless screws?

I assume I need a pilot hole, or should I try to thru-bolt it? I don't think this will work well with the length and small bolt size.


It is basically one of these: http://shop.easternmarine.com/index.cfm?fuseaction=catalog.prodInfo&productID=5425&categoryID=201


bradv
01-20-2010, 04:41 PM
A screw should be able to hold that. You will definately need to drill it out first. Then if you want to use tef gel to go on the screw. that will help (a little) with corrosion from dissimilar metals.

Marlin009
01-20-2010, 04:46 PM
You should use a u-bolt or something if you can. I believe if you drill into the galvanized steel, it will rust. I think the holes in galv trailers are there before they're dipped.


rwidman
01-20-2010, 05:45 PM
A screw should be able to hold that. You will definately need to drill it out first. Then if you want to use tef gel to go on the screw. that will help (a little) with corrosion from dissimilar metals.

If the manufacturer had installed it, they would have used screws.

You may be able to use sheet metal screws, but I think I would drill and tap the trailer for machine screws (the metal should be pretty thick, a little too thick for sheet metal screws).

If you're worried about corrosion, spray cold galvanizing paint on the area after you drill and tap the holes. After it's dry, install the pads using a good sealant on the screw threads.

C Dave
01-25-2010, 03:25 AM
Never-seeze in the hole and on the threads

clamdog1
01-25-2010, 12:59 PM
Why don't you just move the brackets that support the boat in to raise raise the bow. Then you don't need to drill etc.

boat-tox
01-25-2010, 07:31 PM
I had one of those on a trailer, my boat never came in contact with it. Looking at the trailer adjustment would be your best bet. That pad is made for an occasional bump and looked like it would tear off easily too.



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