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What type of screws would be most appropriate?

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Forum topic by finns posted 12-04-2020 01:46 AM 368 views 0 times favorited 5 replies Add to Favorites Watch
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finns

171 posts in 4092 days


12-04-2020 01:46 AM

My project calls for hairpin legs attached to 3/4 appleply plywood. A simple desk top design 18” x 3’. I’m concerned a #8 or a #10 wood screw would easily loosen up regardless of the quality of the plywood. I was planning to secure the legs directly to the 3/4 ply as each leg assembly is welded to a flat bracket that has three holes for mounting.

My question being as straight forward as this seems; what is the best solution for screws?


5 replies so far

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Scap

150 posts in 903 days


#1 posted 12-04-2020 01:58 AM

Threaded inserts might be a good option for you.

View AndyJ1s's profile

AndyJ1s

485 posts in 731 days


#2 posted 12-04-2020 02:14 AM

The biggest diameter screws that will fit through the holes in the leg brackets.

If the holes in the brackets are countersunk (conical) then you need flat head wood screws, for which the length is measured from top of head to tip of screw. 3/4” length might work, depending on the thickness of the plywood (actual measured, not nominal thickness), and the thickness of the bracket (assuming the bracket is countersunk such that the screw head will be flush with the bracket).

If the holes in the brackets are not countersunk, then use round head wood screws, for which which the length is measured from the bottom of the head to the tip of the screw. 3/4” length will work, or maybe more length will (better), depending on the thickness of the leg bracket.

-- Andy - Arlington TX

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Madmark2

2096 posts in 1564 days


#3 posted 12-04-2020 02:27 AM

Glue a 4×4 or so block where the legs go. You can then use longer screws. Be sure to pilot.

-- The hump with the stump and the pump!

View Rich's profile

Rich

6398 posts in 1565 days


#4 posted 12-04-2020 03:40 AM


My project calls for hairpin legs attached to 3/4 appleply plywood. A simple desk top design 18” x 3 . I m concerned a #8 or a #10 wood screw would easily loosen up regardless of the quality of the plywood. I was planning to secure the legs directly to the 3/4 ply as each leg assembly is welded to a flat bracket that has three holes for mounting.

My question being as straight forward as this seems; what is the best solution for screws?

- finns

They’ll hold fine. Three screws per leg is going to be rock solid. Go with the largest screw that will fit through the holes in the leg plates.

When you drill the pilot holes, check online for the correct bit size for soft wood. That’ll give you the best bite in that ply. There are countless sites with charts for that.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

View SMP's profile

SMP

3203 posts in 881 days


#5 posted 12-04-2020 04:45 AM

Yeah I usually take the legs/brackets and a scrap of the wood into the hardware store and see what the biggest I can get in the hole and also to make sure I get the right depth and if I need to go up in length and add a washer etc.

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