Steel Crimp 1 Wire Braid Reduced Bore Fitting, 9/16-18 Female JIC 37 deg Flare Swivel, -06 Hose, Straight

This fitting is designed to withstand minimum working temperatures as low as -40 degrees, so it should be suitable for colder environments where hydraulic fluid is being used.

Reduced bore means the internal flow path is narrower than a full-bore fitting of the same hose size. On this one, end size 1 comes in at 0.5625 inches and end size 2 at 0.375 inches, so yes, there is a size step-down built into the fitting itself. If your system needs unrestricted full-bore flow through a -06 line, this particular fitting would not be the right pick. For applications where a slight restriction is acceptable, it works fine and crimps onto -06 hose just like a standard fitting would.

For crimping convenience, this reduced bore steel fitting is engineered to crimp onto a -06 hose and it is specifically noted as no mandrel required.