Drill Bit / screw sizes

#1 03-15-2007, 11:39 PM

Will stare drilling holes for the boat hardware soon. Can anyone tell me where I can find a chart which shows what size drill bit to use for drilling fiberglass for each screw size. Have such a chart for wood. However, it is not applicable for drilling fiberglass.
Warner

#2 03-15-2007, 11:39 PM

Will stare drilling holes for the boat hardware soon. Can anyone tell me where I can find a chart which shows what size drill bit to use for drilling fiberglass for each screw size. Have such a chart for wood. However, it is not applicable for drilling fiberglass.
Warner

Airslot · #3 03-16-2007, 12:08 AM

Don't have a chart, but I know that you need a pilot hole slightly larger than what you'd use in wood.

Airslot · #4 03-16-2007, 12:08 AM

Don't have a chart, but I know that you need a pilot hole slightly larger than what you'd use in wood.

spareparts · #5 03-16-2007, 12:55 AM

i use an 1/8" pilot hole for everything, if the screw is too hard to go in, I "waller out" the hole a little more with the same bit. If its too loose with the 1/8, then you use that Marine Tex stuff

spareparts · #6 03-16-2007, 12:55 AM

i use an 1/8" pilot hole for everything, if the screw is too hard to go in, I "waller out" the hole a little more with the same bit. If its too loose with the 1/8, then you use that Marine Tex stuff

Stillrunning · #7 03-16-2007, 11:33 AM

I try and use a bit that is the size of the screw minus the threads. For example if you removed the threads off the screw the bit would be the same width as whould be left on the screw. If the hole is too small you stand a chance of spider cracks (I think thats what they call them). The main thing is to seal those things up real good.

Stillrunning · #8 03-16-2007, 11:33 AM

I try and use a bit that is the size of the screw minus the threads. For example if you removed the threads off the screw the bit would be the same width as whould be left on the screw. If the hole is too small you stand a chance of spider cracks (I think thats what they call them). The main thing is to seal those things up real good.

tsubaki · #9 03-16-2007, 01:41 PM

I do the same thing but if I'm real worried about the work or location I'll scoot a little 5200 in the holes and under the hardware.

tsubaki · #10 03-16-2007, 01:41 PM

I do the same thing but if I'm real worried about the work or location I'll scoot a little 5200 in the holes and under the hardware.