Integral steel pipe flanges with tongue and groove face for PN4.0MPa(40 bar)
join tongue and groove, in carpentry.
They made joints in stone keeping the lintels in place horizontally using a tongue and groove joint and subsequently fixing the upright and lintel with a ball and socket joint or mortice and tenon.
Steel pipe blank flanges with tongue and groove face for PN 15.0MPa (150 bar)
Hubbed slip-on-welding steel pipe flanges with tongue and groove face for PN 5.0MPa (50 bar)
