High Purity Bulkhead Union are manufactured with industry standard SS 316L material due to its high corrision and oxidation resistant properties Bulkhead unions in other Materials such as VAR AODVAR VODVAR or VIMVAR and various alloys are available

Bulkhead Union


Ordering Number

Face Seal



Hex Flat


Tube ID

  inch inch inch inch inch
BHU-2-1.530 1/8 7/16 0.090 1.530 0.905
BHU-4-1.820 1/4 3/4 0.180 1.820 0.990
BHU-4-2.230 1/4 3/4 0.180 2.230 1.300
BHU-8-2.140 1/2 11/16 0.400 2.140 1.110
BHU-8-2.570 1/2 11/16 0.400 2.570 1.480


Truelok standard Face Seal & Mini Weld Fittings are manufactured with SS316L, which is the industry preferred material for high purity fittings due to its corrision and oxidation resistant properties. Other Materials such as VAR, AOD/VAR, VOD/VAR or VIM/VAR and various alloys are available per customer request for their specific applications.

Truelok Face Seal & Mini Weld Fittings are offered in Electropolished Finish as well. Just add E at the end of your part number for Electropolished finish.

Surface Finish:
Ra value of our standard finish is between 15 Ra and 10 Ra. Ra value of our Electropolished finish is between 10 Ra and 5 Ra.