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My woodworking ivolves usually 2 thicknesess-16mm and 18-9mm

joining to boards of 16mm would require a pocket screw of 25mm
my question is if I could use the same screw for joining 2 boards of 18-19mm? or it would be to short?
 

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Just me, but I would use 1 1/4" (32mm) screws for 18-19mm (3/4") timber.
 
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I am with James. Try a 25mm screw in the pocket-hole side of an off-cut of the 19mm, to see how much thread on the un-tapered part of the screw shaft is available to engage with the mating part. The tapered part is unreliable.
 

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For connecting 18mm, use the inch and a quarter screws. Coarse thread for soft woods, fine threads for hardwood. For half inch or 12mm, the instructions say to use a one inch (25mm) screw. I only use the square drive heads. Phillips type sucks because the driver bit easily slips and hits your project.
 

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Just me, but I would use 1 1/4" (32mm) screws for 18-19mm (3/4") timber.
Oh No, I have mixed my metric and imperial....LOL

Just me, but I would use 32mm (1 1/4" ) screws for 18-19mm (3/4") timber
 
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