Thread data

ORFS thread chart and dimensions

O ring face seal fitting. An O ring in the face compresses against a flat mating face, making it one of the most leak resistant connections under high pressure and vibration. Common on construction, forestry and agricultural equipment.

Standard: SAE J1453
Seals by: O ring on flat face
Used for: Leak free high pressure lines
Sizes: -4 to -24

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ORFS dimensions

The dimensions we machine to. Pressure values are nominal working ratings for steel at room temperature.

Size	Male	Female	Thread	Tube OD	Pitch dia	Minor dia, male	Minor dia, female	Male thread length	Tap drill	Face O ring	Rated to
-4	9/16-18 UNF-2A	9/16-18 UNF-2B	9/16-18 UNF	6.35 mm	13.37 mm	12.56 mm	12.76 mm	11.18 mm	1/2 (12.88 mm)	AS568-011	6,000 psi
-6	11/16-16 UN-2A	11/16-16 UN-2B	11/16-16 UN	9.52 mm	16.43 mm	15.51 mm	15.74 mm	12.70 mm	5/8 (15.88 mm)	AS568-012	6,000 psi
-8	13/16-16 UN-2A	13/16-16 UN-2B	13/16-16 UN	12.70 mm	19.61 mm	18.69 mm	18.92 mm	14.22 mm	3/4 (19.05 mm)	AS568-014	6,000 psi
-10	1-14 UNS-2A	1-14 UNS-2B	1-14 UNS	15.88 mm	24.22 mm	23.17 mm	23.44 mm	16.76 mm	59/64 (23.59 mm)	AS568-016	6,000 psi
-12	1 3/16-12 UN-2A	1 3/16-12 UN-2B	1 3/16-12 UN	19.05 mm	28.79 mm	27.57 mm	27.87 mm	17.78 mm	1 7/64 (28.05 mm)	AS568-018	6,000 psi
-16	1 7/16-12 UN-2A	1 7/16-12 UN-2B	1 7/16-12 UN	25.40 mm	35.14 mm	33.92 mm	34.22 mm	19.05 mm	1 23/64 (34.40 mm)	AS568-021	5,000 psi
-20	1 11/16-12 UN-2A	1 11/16-12 UN-2B	1 11/16-12 UN	31.75 mm	41.49 mm	40.27 mm	40.57 mm	19.81 mm	1 39/64 (40.75 mm)	AS568-025	4,000 psi
-24	2-12 UN-2A	2-12 UN-2B	2-12 UN	38.10 mm	49.43 mm	48.20 mm	48.51 mm	20.32 mm	1 59/64 (48.68 mm)	AS568-029	4,000 psi

Adapters with ORFS

NPT to ORFS adapters JIC to ORFS adapters ORB to ORFS adapters ORFS to BSPP adapters

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