m12 x 180 galvanized coach bolts

[adders21]

Hi All,

I'm about to start building a deck. I have managed to source galvanized m12 thru bolts for hanging my ledger board but cannot find any m12 x 180 galvanized coach bolts for hanging the joists on the posts. Are zinc bolts ok?

I'm also having trouble getting hold of the correct joist hangers for 150 x 47 joist. I wanted Simpson strong tie LUP230/47 as they seem the only ones with the correct size. Do you know where I can get them? Or suggest an alternative? I might end up skew screwing.

I live in Derby.

Thank you for reading
Ian

 

[Stivino]

I would imagine that Zinc bolts and Galvanised bolts are one and the same.

 

[adders21]

I am referring to 'hot dipped galvanized' like these thru/through bolts


http://shop.grfasteners.com/epages/...oducts/G841M580180/SubProducts/G841M580180.10

 

[holmslaw]

Instead of coach bolts, why not use threaded rod with nuts and penny washers. I reckon it would be a lot cheaper.

 

[merlin50]

http://www.toolstation.com/shop/Scr...ts/Coach+Bolt+Nut+M12+x+180/d90/sd1670/p13731

 

[adders21]

Thank you for your replies.

The bolts at Toolstation I presume are zinc plated and not hot dipped.

Do I not need hot dipped galvanized to use in pressure treated timber outdoors?

 

[merlin50]

its only garden decking not boat decking

 

[adders21]

Hi Merlin / All,

I have read that the chemicals in pressure treated wood will corrode zinc plated bolts and that hot dipped galvanised should be used as these have a thicker coating of zinc. I was hopping to get some advice as to which type of bolt I should be using.

 

[Stivino]

I think this subject has been discussed on the forum before. I'll do a wee searsh and see if I can find it.

 

[adders21]

Hi Stivino,

I've searched but can't find anything. Hope you have better luck.
Thank you for replying

 

[pantsmachine]

Go for the cheapest of the 2. Your deck will rot out from under your feet before an M12 treated bolt corrodes through! I'm assuming your deck will last 20 years you know.....

If you are worried grease the bolts when fitting.