Pilot Hole Drill Sizes in Fiberglass

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   Do any of you gents have a chart showing the proper size drill bits for pilot holes in fiberglass for screws sizes #6 #8 #10 and #12.
Thanks.  JQ

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Jonny Quest Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2840	Post Options Post Reply Quote Jonny Quest Report Post Thanks(0) Quote Reply Topic: Pilot Hole Drill Sizes in Fiberglass Posted: May-24-2022 at 12:14am
	Do any of you gents have a chart showing the proper size drill bits for pilot holes in fiberglass for screws sizes #6 #8 #10 and #12. Thanks. JQ
	Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum

63 Skier Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: October-06-2006 Location: Concord, NH Status: Offline Points: 4231	Post Options Post Reply Quote 63 Skier Report Post Thanks(0) Quote Reply Posted: May-24-2022 at 11:48am
	Sorry I don't have a chart. Being honest, I hold bits up to the screws and guess, erring on the small bit size. Then I drill a hole in waste material to check. I know I should care about the correct size but this seems to work.
	'63 American Skier - '98 Sport Nautique

pjsmoreno Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: April-25-2016 Location: Liberty, Mo Status: Offline Points: 157	Post Options Post Reply Quote pjsmoreno Report Post Thanks(0) Quote Reply Posted: May-24-2022 at 2:51pm
	I do the same as to hold the drill bit up to the screw and make sure only the threads are visible. Fiberglass does not have much forgiveness when you under size the hole and put a screw in. Too much of a turn will twist off the screw head. Even if its stainless steel.

Jonny Quest Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2840	Post Options Post Reply Quote Jonny Quest Report Post Thanks(0) Quote Reply Posted: May-24-2022 at 3:34pm
	I used my tried-and-true pilot hole guide for wood, but it’s tough going. I’m afraid to snap a SS screw… JQ
	Current 2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum

Pilot Hole Drill Sizes in Fiberglass

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