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Pilot Hole Size For Lag Screws In Soft Wood

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DumOleBob

05-15-2003 09:08:16




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What's the right size pilot hole for 1/4", 3/8 & 1/2" lag screws in soft wood? I'm sure there is a site out there that gives it but all I've found is highgly tech or medical. Just need it for plain old wood.

Thanks




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Dick Kline

05-16-2003 09:17:02




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 Re: Pilot Hole Size For Lag Screws In Soft Wood in reply to DumOleBob, 05-15-2003 09:08:16  
I like to use a little soap on the threads to lube things up. Just rub it over some ivory or use some liquid soap.



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evielboweviel

05-17-2003 10:11:44




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 Re: Re: Pilot Hole Size For Lag Screws In Soft Wood in reply to Dick Kline, 05-16-2003 09:17:02  
watch out for soap will make screws rust and can cause problems if piece is finished and displayed. consider using beeswax instead in fancy work



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wdTom

05-15-2003 17:50:34




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 Re: Pilot Hole Size For Lag Screws In Soft Wood in reply to DumOleBob, 05-15-2003 09:08:16  
Agree with what eviel said, but will add basically the right size pilot is one that allows you to screw in the lagscrew without twisting it off, but still provides a good hold on the screw, it can vary with kind of wood, amount of moisture in the wood, length of screw, how close to the end of the wood-don't want the lagscrew to split out the piece of wood. You need to develope a feel for it, remembering it is easier to drill it out larger than to drill it smaller once it is too big.

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DumOleBob

05-15-2003 22:38:51




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 Re: Re: Pilot Hole Size For Lag Screws In Soft Wood in reply to wdTom, 05-15-2003 17:50:34  
Yup - Your "Without Twisting It Off" advice is exactly what I'm looking for. Is it that I'm gettin' stronger or the lags are gettin' weaker? Sure don't take much to twist 'em off.....

Good advice guys - Thanks!



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evielboweviel

05-15-2003 09:53:16




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 Re: Pilot Hole Size For Lag Screws In Soft Wood in reply to DumOleBob, 05-15-2003 09:08:16  
I would use a drill bit slightly smaller than the center of the threaded part, smaller if pine larger if oak. also use a full size bit for the shank of the lag screw only. for 1/4 inch lag screw use a 1/4 or 9/32 drill for shank and a 1/8 bit for threaded section in pine, 5/32 in oak or 50+ year old yellow pine. This is based on 1/4 lag scews I have on hand right now.



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