16 mm-thick steel: self-drilling screw vs. self-tapping screw

The EJOT SUPER SAPHIR self-drilling screw JT3-18-5.5xL can penetrate 16 mm-thick steel with breathtaking speed. It drills a hole and cuts a thread turn into the steel plate in only one work step.

You can see the necessary time for a dog-point screw without drill point in direct comparison. Here, the screw hole has to be drilled with a twist drill at first, then the dog-point screw is inserted and cuts through the steel board.

The test screw was the EJOT self-tapping screw JZ3-6.3xL.

Challenge: JT3-18 vs. JZ3-6.3