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Screws - Coarse vs Fine Threads

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Forum topic by rance posted 06-08-2012 06:30 AM 5223 views 0 times favorited 19 replies Add to Favorites Watch
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rance

4132 posts in 1810 days


06-08-2012 06:30 AM

Topic tags/keywords: screws coarse thread fine thread

I ran across two boxes of 1-1/4” screws the other day. One is coarse and one is fine thread. I realize that coarse are intended more for soft woods and fine are intended for harder woods. I don’t really like stocking both though so I figured that the coarse ones would win out. With hardwoods I pre-drill anyways so I might just have to drill an ever so slightly larger holes for the coarse thread screws. Any reason I might not want to do this? Just a ponderance.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--


19 replies so far

View kizerpea's profile

kizerpea

746 posts in 1017 days


#1 posted 06-08-2012 11:54 AM

yeah….if the wood is to hard POP goes the head!

-- IF YOUR NOT MAKING DUST...YOU ARE COLLECTING IT! SOUTH CAROLINA.

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Jim Jakosh

11415 posts in 1755 days


#2 posted 06-08-2012 12:21 PM

They both have a purpose- especially when using a Kreg fixture where you cannot pre-drill. The fine ones are needed for the hardwoods. When I pre-drill, I use the same drill size for what every wood, the coarser thread cuts the soft wood easier so no bigger hole is needed. The thing is that the OD is the same for both in the same size – say a #8- so the hole should be the same.
My 2 cents worth…...............Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View dhazelton's profile

dhazelton

1182 posts in 946 days


#3 posted 06-08-2012 01:19 PM

Drywall screws? Fine thread is meant for steel studs.

View rance's profile

rance

4132 posts in 1810 days


#4 posted 06-08-2012 01:43 PM

Yeah, I think they are drywall screws. I just don’t like stocking both. I’m thinking that I can use coarse for both.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View tyskkvinna's profile

tyskkvinna

1308 posts in 1636 days


#5 posted 06-08-2012 02:53 PM

Honestly I use coarse across the board. If the wood is particularly hard I just go really gentle and sometimes back up and go back down.

-- Lis - Michigan - http://www.missmooseart.com - https://www.etsy.com/people/lisbokt

View waho6o9's profile

waho6o9

4905 posts in 1227 days


#6 posted 06-08-2012 03:01 PM

GRKs totally rock, move up a notch and rock on.

View andy_P's profile

andy_P

218 posts in 1858 days


#7 posted 06-08-2012 03:13 PM

I think what you have to consider is that the threads are taking a good enough bite in the wood surrounding the hole you drill so that it holds. If you are using glue along with the screws, I think this becomes less of a factor. Send me the ones you decide not to use…...LOL.

that’s my cent and a half, rance.

-- Wood is a gift from God/Nature that maintains its beauty forever via the hand of a woodworker.

View fussy's profile

fussy

980 posts in 1700 days


#8 posted 06-09-2012 01:04 AM

Rance,

I wood use whatever I had. Seems that is usually coarse thread. If I’m leery of using coarse in hardwood, I wax the threads with beeswax and go slowly; back out and go again if it seems to bind.

Steve

-- Steve in KY. 44 years so far with my lovely bride. Think I'll keep her.

View HamS's profile

HamS

1168 posts in 1039 days


#9 posted 06-09-2012 01:09 AM

I was just going to say wax the screws first in hardwood but Fussy beat me to it. I have a cake of beeswak the size of a tuna can on my bench and one in my tool box just for that. I use the wax a lot on hardwood. It usually is not needed in softwood and sheetgoods.

-- My mother named me Hamilton, I have been trying to earn my nickname ever since.

View oluf's profile

oluf

256 posts in 1689 days


#10 posted 06-09-2012 01:30 AM

I find beeswax a little hard for using on screws so I buy a wax toilet boal gasket. They are good for about 1000 screws or until you step on it. But than you don’t have to sweep the shop any more. The sawdust will all be on your shoe.

-- Nils, So. Central MI. Wood is honest.Take the effort to understand what it has to tell you before you try to change it.

View rance's profile

rance

4132 posts in 1810 days


#11 posted 06-09-2012 02:25 AM

Good input from all. I think I’ll just use these fine threads where I can until they are all gone. Those are the ones I didn’t buy myself. Any new ones I buy will be coarse(like Lis uses).

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View Roger's profile

Roger

14536 posts in 1454 days


#12 posted 06-09-2012 02:42 AM

I use a wax ring from a toilet…. A new one of coarse. I keep a wax ring in an old cookie can, and when I do any screwin, I’ll dip me screw in the wax ring, and go to town

-- Roger from KY. Work/Play/Travel Safe. Kentuk55@bellsouth.net

View gfadvm's profile

gfadvm

10845 posts in 1340 days


#13 posted 06-09-2012 02:56 AM

Rance, It ruins my whole day when I twist the head off of a screw and it happened too often with those black screws in hardwood so I took the cure. Now they are used only in pine or plywood. Just sayin.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

View rockindavan's profile

rockindavan

283 posts in 1286 days


#14 posted 06-09-2012 06:38 AM

Fine threads are nice particularly when using pocket holes (however rare the occasion is), especially when you have to take the joint apart a couple of times. I recently screwed a face frame on to a cabinet and had to take it on and off 2-3 times. Coarse threads have a better chance of stripping out.

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rance

4132 posts in 1810 days


#15 posted 06-09-2012 12:26 PM

Good point Andy. rockin, I’v had just the opposite, the fine seem to strip out more often. Several factors could affect this.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

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