Internal unions - bulkhead

Bulkhead unions differ from standard unions in that bulkhead unions 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. An O-ring can be installed between the body and the panel to allow operation in purged environments. Typically the mounting nut goes inside the instrument, so that the long threaded portion will be out of sight.

Standard material is 300 series stainless or PEEK. Also available in Hastelloy C, gold-plated stainless, and titanium. Read about properties of metals and polymers.

Stainless - hex

PEEK - fingertight

PEEK - hex