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External/internal unions

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. Read about properties of metals.

Sizes available: 1/32", 1/16", 1/8"

Product numbers

Select a type of union to jump to product numbers:

Standard
Bulkhead

Further reference

About unions
Internal unions
Standard
Bulkhead
External unions
Standard
Bulkhead
1/32" ultra low mass external unions
Microvolume unions
Nanovolume unions
External/internal unions
Reducing unions
Unions with 1/4-28 fittings

Standard external/internal unions

Tubing OD	Bore	Product No.
1/32"	0.25 mm	EZU.5
1/32"	0.50 mm	EZU.5L
1/16"	0.25 mm	EZU1C
	0.50 mm	EZU1M
	0.75 mm	EZU1
	1/16"	EZU1T
1/8"	1.0 mm	EZU2
	2.0 mm	EZU2L
	1/8"	EZU2T

Bulkhead external/internal unions

Tubing OD	Bore	Bulkhead panel hole diameter	Product No.
1/16"	0.25 mm	5/16"	EZBU1C
	0.50 mm	5/16"	EZBU1M
	0.75 mm	5/16"	EZBU1
	1/16"	5/16"	EZBU1T
1/8"	1.0 mm	7/16"	EZBU2
	2.0 mm	7/16"	EZBU2L
	1/8"	7/16"	EZBU2T