17 Feb 2014 I need to put some m10 coach screws into an lvl, is there a specified size I I usually pre-drill to the size of the shank between the 'blades' of the screw. I think the guide is you need to go "through" 3 laminations, check tho'I need to fix some 12mm diam coach screws into wood. Normal pilot Initial thought are that I could use an 8.5mm pilot h*** .. don't want to . If you mark your drill bits with masking tape as depth guides you . Only go up to M10 though. --

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Also what size pilot for a 3/8" coach screw? Any advice on . part of the shank say on an M10 screw would I drill the pilot to a full 10mm? . I'm basing my plans on the guide from Curt's site and trying to keep it a little less OTT: Drill the pilot h*** 2mm smaller than the size Coach Screw used. been made to ensure all measurements are accurate, they should only be used as a guide Note the depth as well, the pilot h*** depth for coach screws should be But any guide that gives just a single size for each screw gauge is not Perhaps the question you should be asking/googling is more like: what is the correct size h*** to tap an m10 thread? (even though it sounds Do M12 coach screws need a pilot h***: I've got a few (!) to put into treated timber (softwood) and I dont Can you not use an M10 or M8 ? 31 Jan 2018 Recommended Pilot Holes Sizes – Inch Screws. Material M10 x 1.50. Steel . . 9.10. 9.17 Recommended Pilot H*** Sizes in Steel Nut Members – Inch Sizes (in). Applica .. Example: The chart shows that for a M4 x 0.7 screw in a material Available Thread sizes, 6mm, 8mm, 10mm, 12mm, M6, M8 and M10 Timber: All coach screws require a pilot h***, using a general purpose drill bit such as a