-Straight-Thread O-Ring Fittings are the ones you thread into place, then tighten a nut on the fitting against an 0-ring built into the fitting. FYI, to ‘test’ an old, used straight-thread o ...

This article was updated Jan. 17, 2023. It was originally published Oct. 21, 2004. Using the correct thread is critical for proper mating and replacing hydraulic fittings. First and foremost, it ...

SAE Transactions, Vol. 107, Section 2: JOURNAL OF COMMERCIAL VEHICLES (1998), pp. 177-181 (5 pages) SAE J1453 O-ring Face Seal (ORFS) Fittings have emerged as the premier fittings to eliminate fluid ...