Abstract: A payout tube assembly for unwinding filamentary material from a wound coil of filamentary material contained in a container having a wall panel with a hole for mounting a push-on tube and locking collar on the container wall panel, wherein a hollow payout tube having an end portion extends through the hole, the end portion including a flange extending around the periphery of the tube and having a surface engaging the inner surface of the wall panel surrounding the hole, and further including at least three segmented locking protrusions extending around the periphery of the end portion and separated by spaces; a locking collar for engaging the outer wall of the wall panel and including at least three segmented locking teeth equally spaced substantially around an inner perimeter of the locking collar for engaging with the segmented locking protrusions with pressure exerted on the locking collar to cause the payout tube and the locking collar to be locked together by increased locking forces produced by the thr