Pilot Hole Lag/Coach screws

Joined
3 Jun 2014
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Location
Sheffield
Country
United Kingdom
Hi Guys,

Can you please tell me the diameter of the pilot hole for M10, M6 coach screws/bolts into Redwood (hardwood)

Thanks

Scott
 
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For bolts 1mm larger than thread dia , for screw 2mm smaller than thread dia.
 

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