Tube End Reducers End Sizes Clarified

I have talked to a few customers this week who were having some trouble identifying the sizes of the ends for our Swagelok tube end reducers, so I thought I would write a post to clarify this information.

A general photo of the style of a tube end reducer that we sell is shown below.  The Red Arrow points to the "tube" side, and the Green Arrow to the "compression" side.

The table directly below lists our Swagelok tube end reducers.  The first dimension (left-side) is the outside diameter (OD) of the tube end (as shown by the Red Arrow above) and the second dimension (right-side) is the compression end (as shown by the Green Arrow above).  The compression end is listed as the size of the OD tubing it is designed to connect to.  For example, Restek 23179 has a ¹⁄₄’’ OD tube on one end, and the other side (compression end) will connect to ¹⁄₈’’ OD tubing.

The table below lists our Swagelok Tube End Reducers.

Catalog #	Size	Material	Vendor Cat. #	Units
23177	1⁄4’’ to 1⁄16’’	Stainless Steel	SS-100-R-4	2-pk.
22554	1⁄4’’ to 1⁄16’’	Siltek/Sulfinert Treated	SS-100-R-4	ea.
23129	1⁄4’’ to 1⁄8’’	Brass	B-200-R-4	5-pk.
23179	1⁄4’’ to 1⁄8’’	Stainless Steel	SS-200-R-4	2-pk.
22556	1⁄4’’ to 1⁄8’’	Siltek/Sulfinert Treated	SS-200-R-4	ea.
23126	1⁄8’’ to 1⁄16’’	Brass	B-100-R-2	5-pk.
23176	1⁄8’’ to 1⁄16’’	Stainless Steel	SS-100-R-2	2-pk.
22553	1⁄8’’ to 1⁄16’’	Siltek/Sulfinert Treated	SS-100-R-2	ea.
22588	1⁄8’’ to 1⁄16’’	Silcosteel-CR Treated	SS-100-R-2	ea.
23128	1⁄8’’ to 1⁄4’’	Brass	B-400-R-2	5-pk.
23178	1⁄8’’ to 1⁄4’’	Stainless Steel	SS-400-R-2	2-pk.
22555	1⁄8’’ to 1⁄4’’	Siltek/Sulfinert Treated	SS-400-R-2	ea.

I hope this helps clarify the end sizes of our tube end reducers.  If you still have questions, email technical service .  Thanks.