Screw length in a table top

Submitted by tonitacker t3_126wz4m in DIY

Hey guys, I'd like to add a cable duct under my new desk and I worry about the length of the screws.

Some reviews (on the German website) stated that the provided screws are too long and penetrate the top (they are sold directly with the table top)

The thickness of the maple table top is 25 mm (about 1").

How much clearance do I have to keep before the wood starts bulging on the top?

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Comments

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nevets429 t1_jebbw9f wrote

General rule for most surfaces in woodworking is not to exceed 2/3 the thickness. I’ve had some particle boards that anything more than half the thickness shows a dimple on the backside. I’d go slow and add a few washers if necessary.

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howard416 t1_jebd1l1 wrote

If you're very concerned, just stack a bunch of washers underneath the screw heads to effectively shorten the screws. Not the prettiest solution but fine for your application.

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essaitchthrowaway3 t1_jebent2 wrote

Make sure the hole is pre-drilled. I would not go into the wood more than 20 mm (3/4").

How thick is the cable duct that you want to install? If it is 2 or 3 mm thick, then I would buy 20 mm screw (which would mean it isn't going into the top more than 17-18 mm)

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tonitacker OP t1_jebgh1r wrote

It didn't arrived yet but according to the product picture I'd figure it's at least 3mm thick. I'm just gonna be careful.

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SirIsaacGnuton t1_jebml1t wrote

I'll cut a screw tip off with an angle grinder if the length is worrisome. And it's maple so a pilot hole is needed.

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Peopletowner t1_jebonee wrote

Just get some 1/2“ screws, that ducting doesn't need much. Pre-drill in solid hardwood.

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smashnmashbruh t1_jecq2s1 wrote

Why risk it, double sided tape on the channel

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carthous t1_jec13le wrote

Why not just screw right through the table and cut the top off with a hacksaw, sand smooth. Perfect!

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