Advice on M10 Coach Screws for Concrete Spur use - are these any good?

[cliffa]

Hi,
I've 11 three hole 100mm 1200mm concrete repair spurs to fit in my own garden (won't need to go to the gym for a bit!).
As ever over thinking the job. I've had the spurs and post mix delivered but didn't like the cost of the coach screws so left those.
I like the idea of SS Screws but unless someone knows a good cheap source (sub £1 each) I'll have to go with BZP or galvanised.
What are peoples thoughts on these from screw fix - https://www.screwfix.com/p/turbocoa...illing-coach-screws-m10-x-160mm-50-pack/5510g
Even though they are flanged think I'm best with washers too? If those ones are OK I'll go with them unless someone knows of better / low cost option. Thanks.

 

[JohnD]

I recommend bolts, not screws, with a large washer on each side.

I am in a coastal area so I use stainless. 6mm will do as the minimum.

Long stainless bolts are fairly expensive, but you can get stainless studding much cheaper. There are ebay vendors who will cut to length.

You need to use an anti-seize lube as stainless can cold-weld.

If not using stainless, 8mm BZP studding is quite cheap. In my garden, it rusts through and breaks. This is very inconvenient.

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[cliffa]

Hi, @JohnD, sorry I mixed and matched bolts and screws. I've edited now to only use screws which is the option I want to go with. Sorry for confussion.

 

[JohnD]

I found 200mm lengths M6 at £21.55 for ten.

There might be a better deal somewhere

I think 150mm would be too short

You can tighten the nut if they become loose

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