Timber to steel self drilling screws for fixing timber up to 12mm steel.
www.orbitalfasteners.co.uk
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dont use wood to wood screws, or standard roofing screws. You need the fine thread like a metric bolt to thread into the metal. A rough thread like a wood screw will just ring off when it hits the metal, unless it’s very thin.
Those bolts are available from Wurth got some to do a lowloader floor once........................................................................................
they have two wings that countersink the timber and then shear off ........................................................................................
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