External/internal unions have male threads on one end and female threads on the other, for connecting a standard zero dead volume fitting to an existing tube which already has an external nut made up on it. Standard material is 300 series stainless. Also available in Hastelloy C and gold-plated stainless versions.
Select the union with the bore that matches the ID of the tubing. If the IDs are different, choose the union with a bore which matches the smaller tube bore.
Bulkhead versions are designed to be mounted through an instrument panel or on a bracket. The fitting body is undercut so that it bites into the panel when the mounting nut is tightened, eliminating the need for a lock washer.
Note: Because 1/16" external fittings have very thin, easily distorted walls, they are not as durable as 1/16" internal fittings. We recommend this style of union when connecting to an installed external nut.
Make a selection below to view product numbers:
Standard external/internal unions
|Tubing OD||Bore||Product No.|
Bulkhead External/Internal Unions
The "Hole" heading in the table below refers to the size of the hole required for mounting the union through a bulkhead or panel.
|Tubing OD||Bore||Hole||Product No.|