ISO 8434-4 ORFS fittings are made of carbon steel shall meet or exceed without leakage the requirements from a vacuum of 6,5 kPa (0,065 bar) absolute pressure to the working pressures given in Table 1 when used at temperatures between −40 °C and +120 °C with petroleum-based hydraulic fluids
Working pressures for SAE J1453 O-ring face seal connectors
Maximum working pressure Tube outside diameter a Connectors with non adjustable stud ends Connectors with adjustable stud ends mm in Thread b MPa (bar) MPa (bar)
6 1/4 M12 × 1,5 63 (630) 40 (400)
8 5/16 M14 × 1,5 63 (630) 40 (400)
10 3/8 M16 × 1,5 63 (630) 40 (400)
12 1/2 M18 × 1,5 63 (630) 40 (400)
16 5/8 M22 × 1,5 40 (400) 40 (400)
20 3/4 M27 × 2 40 (400) 40 (400)
22 7/8 M30 × 2 40 (400) 35 (350)
25 1 M33 × 2 40 (400) 35 (350)
30 1 ¼ M42 × 2 25 (250) 25 (250)
38 1 ½ M48 × 2 25 (250) 20 (200)
NOTE These pressures were established using connectors made of low carbon steel and tested according to Clause 15.
a Metric tubing shall be preferred.
b Port in accordance with ISO 6149-1; stud end in accordance with ISO 6149-2.
c This size will be included in the revisions of ISO 6149-1 and ISO 6149-2.
