P6-4040 Aluminum Profile

The P6-4040 profile measures 40mm*40mm. While it shares the same dimensions as the P8-4040 profile from the 40 series, their structural designs are completely different: the P6-4040 has four internal M6 mounting holes, whereas the P8-4040 has only one M8 mounting hole; each surface of the P6-4040 profile has two 6.2mm T-slots, while each surface of the P8-4040 has only one 8.2mm T-slot.

Due to these structural differences, the P6-4040 profile is normally used in assembly with 20 series profiles  rather than 40 series.