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ORFS (O-ring face seal) has an O-ring recessed into the face of the male, this is designed to seal against the flat face of the ORFS female creating a leak free seal.

ORFS Thread ID

To identify a male thread, measure the outer diameter, as in the picture and compare with the tables below.
To identify a female thread, measure the internal diameter, as in the picture, and compare with the tables below.
Thread Id
Dimension given in the following tables are not exact measurements and are given as a means of comparing and identifying threads. All adaptors are made to engineering tolerances and there will be variations in dimensions because of this.
Dash SizeThread SizeThreads Per InchFemale Thread I.D (MM)Male Thread O.D (mm)O-Ring Size

ORFS – SAE J1454 – Pressure Ratings and Torque Values

DashsizeNom Tube OD Size mmNom Tube OD Size inWorking pressure – Straight fittingsTorqueWorking pressure – Adjustable fittingsTorque

DESIGN DETAILS AND SPECIFICATIONS SUBJECT TO CHANGE WITHOUT PRIOR NOTICE – Whilst every effort has been made to ensure the accuracy of the information supplied herein, Burnett & Hillman cannot be held responsible for any errors or omissions (E&OE). Working pressures quoted are taken from the relevant standard and are provided as a guide only.