O-ring face seal type fitting, it also known as ORFS fittings, which has an o-ring in the face of the fitting to help make a better seal. ORFS adapter fittings use a straight thread and have a machined groove in the face of the male fitting to accept an O-ring (of either Buna- N or FKM Viton material), which are designed to eliminate leaks in high pressure hydraulic systems.

O-ring face seal fittings can eliminate leaks in hydraulic systems at operating pressures as high as 6,000 PSI. They are designed specifically for applications where elastomeric seals are acceptable to overcome leakage and variations in assembly procedures. The fittings can be easily connected to a range of tubing grades by silver brazing. In addition, ORFS fittings can be disassembled and reassembled in the field to facilitate replacement of the O-ring or the entire assembly.

QC Hydraulics is manufacturer and supplying high quality SS ORFS hydraulic fittings over 10 years. They are compatible with ORFS adapters from most manufacturers including Parker, Superlok, Eaton Aeroquip, Gates, and Goodyear Hydraulics.

ORFS Hydraulic Adapters available thread configurations:

  • ORFS hydraulic fittings
  • ORFS JIC Adapters
  • ORFS Braze Fittings
  • ORFS Plug
  • ORFS Nut
  • ORFS Sleeve
  • ORFS Cap
  • ORFS Elbow
  • ORFS Tee

Size Range:



Stainless Steel(SS 304, SS 316, SS 316L, SS 316Ti)

ORFS Hydraulic Tube Fitting, Pressure Ratings

Pressure Ratings For ORFS Male Tube Stud, Female Swivels and Straight Thread Stud End(Inch)
Nominal Pipe Size Threads Size (Notes 1&2) Working Pressue(Mpa)
Nom SAE Dash Size Nom Inch Tube O.D SAE J1453 ORFS Tube End SAE J1926/2/ISO 11926 O-ring Port Thread Size ORFS Tube End, Union and Bulkhead Non-Adjustable Stud Adjustable Stud
-4 1/4 9/16-18 UNF 7/16-20 UNF 41.3 63 40
-6 3/8 11/16-16 UNF 9/16-18 UNF 41.3 63 40
-8 1/2 13/16-16 UNF 3/4-16 UNF 41.3 63 40
-10 5/8 1-14 UNF 7/8-14 UNF 41.3 63 40
-12 3/4 1 3/16-12 UNF 1 1/16-12 UNF 41.3 40 40
-16 1 1 7/16-12 UNF 1 5/16-12 UNF 34.5 40 31.5
-20 1 1/4  1 11/16-12 UNF  1 5/8-12 UNF 27.5  25 25
-24 1 1/2 2-12 UNF 1 7/8-12 UNF 20.7 25 20
  1. Threads per SAE J475 Class 2A ext. Class 2B int.(Ref. ISO-263/ISO-R725)
  2. Unified class 2B threads apply to swivel nuts and with minor diameter modified to class 3B limits for locknuts.
  3. Mpa ratings for J1926/2/ISO 11926-2 stud ends are rationalized values as published in those standards.

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