Our Bowden Push Tube Connector (PTC) fittings are spring loaded, keeping your tube in place whether you use C-clips or not.
Thread Pitch: 0.9
Straight Through allows the tube to pass through, choosing no the tube will stop in the PTC connector
NPT stands for National Pipe Thread and is an American standard thread.
01 threading is 1/8 inch diameter, very similar to M10, but with a taper. These ones do not allow the tube to pass all the way through.