Screw size is #10 machine screw, 24 TPI Coarse. There are two lengths available, 3/4" and 1/2". The 3/4" long screw is large enough to go through 2 thick technic liftarms and still screw in or fit a nut. The 5/8" long screw will go through one thick technic liftarm and one thin technic liftarm.  The 1/2" long screw is large enough for just 1 thick technic liftarm. Screws are set up for Allen Wrench or can also be hand tightened.

Also available are nuts for the screws and forceless aluminum pins that will hold 2 LEGO® Technic pieces together without force, which means the forceless pin creates a pivot point, but does not snap into the technic hole so it will not hold the two pieces together alone.

These are LEGO® Technic compatible and work with both traditional plastic LEGO® Technic and our custom-made milled aluminum pieces.

Click Here to view all of our Aluminum LEGO® Technic compatible parts!