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I would go for coach screws, with a large diameter countersunk hole cut with a forstner bit just large enough so the head sits flush or just below the surface.
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When I put mine in I used metal rods (similar to barrier fencing pins) cut down and then drilled the holes out on each sleeper.
They're working absolutely perfect for raised beds and retaining walls. I can get pictures later if you wish.
stevo_com
ffm
spenceey
@mespilus
@ffm @hamrack
This conversation came uo at West Beers last night,
but lets open it up to the hivemind
Securing large timbers, maybe 'rail sleepers' for raised beds.
https://www.orbitalfasteners.co.uk/en/search/q/Spax
or
https://www.orbitalfasteners.co.uk/en/categories/timco-in-dex-heavy-duty-timber-screws
versus say
https://www.orbitalfasteners.co.uk/en/categories/stainless-steel-hexagon-bolts-a2-din-931-fasteners
or
https://www.orbitalfasteners.co.uk/en/categories/stainless-steel-hexagon-head-coach-screw-a2
so screws that cut their own bores,
vs,
guide holes, washers and nylock nuts
Other large dimension timbers are available
other suppliers of fixings are available.
Edit; Item 2 added at suggestion of @ffm