Adapter MALE ORFS X MALE UNF STRAIGHT

Helesul ORFS hydraulic adapters (O-Ring Face Seal) were engineered to eliminate leaks and ensure maximum reliability in high-pressure circuits. Thanks to the O-ring sealing system, they deliver consistent performance even under pulsation, vibration, and severe thermal variations.

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Ideal for tractors, harvesters, dump trucks, and road platforms, Helesul ORFS adapters ensure maximum equipment availability and uninterrupted operation without unexpected downtime.

Technical Details
Applications
Size Chart (ORFS)
Size Chart (UNF)

Technical Details

Standards met: ISO 8434-3;
Maximum operating pressure: 420 bar (6,000 PSI);
Working temperature: -30°C to +120°C;
Body material: carbon steel;
Surface finish: trivalent zinc plating;
O-ring: NBR 90 Shore A;
Certification: ISO 9001.

Applications

From sprayers to elevating platforms, ORFS adapters guarantee a leak-free seal where JIC 37° or BSP fittings fail:

Sprayer booms – prevent agrochemical contamination.
Harvester cylinders – withstand cyclic pressure spikes.
Dump bodies – eliminate oil leaks and enhance safety.
Side-mounted mowers – withstand intense vibration.
Vehicle lift platforms – preserve system integrity during load lifting.

Size Chart (ORFS)

Nominal Size	External Thread (d) [mm]	Internal Thread (D) [mm]
9/16"	14,3	12,8
11/16"	17,5	15,9
13/16"	20,6	19,0
1"	25,4	23,8
1.3/16"	30,2	27,9
1.7/16"	36,5	34,2
1.11/16"	42,9	40,5
2"	50,8	48,41

Size Chart (UNF)

	Nominal Size	Bore (D) [mm]
	5/16"-24	7,9
	3/8"-24	9,5
	7/16"-24	11,1
	1/2"-20	12,7
	9/16"-18	14,3
	3/4"-16	19,0
	7/8"-14	22,2
	1.1/16"-12	27,0
	1.3/16"-12	30,2
	1.5/16"-12	33,4
	1.5/8"-12	41,3

FREQUENTLY ASKED QUESTIONS

Are ORFS adapters compatible with other standards?

It is possible to interconnect ORFS to JIC, BSP or metrics using specific adapters. We recommend checking the pressure, thread and sealing profile of each transition to maintain tightness and safety.

Do I need to retighten the connections after some time of use?

Under normal conditions, no. The O-ring compensates for microsettlements. Use a torque wrench when assembling and follow the torque table by gauge. Frequent retightening may damage the O-ring.

PTFE tape or liquid sealant?

Use PTFE tape if the connection will be retightened periodically. Prefer anaerobic sealant for permanent sealing and greater vibration resistance.

ORFS (O-Ring Face Seal) hydraulic adapters are the ultimate solution to prevent leaks in circuits up to 420 bar, even under intense pulsation, constant vibration, and severe thermal variations. Engineered for tractors, harvesters, dump trucks, and road platforms, they deliver superior reliability and drastically reduce machine downtime.

The elastomeric flat-face sealing eliminates micro-leaks without requiring the metal-to-metal deformation typical of 37° flare connections. This results in:

Up to 30% lower assembly torque, preventing overtightening.

Retightening becoming virtually unnecessary, maintaining stable operating pressure.

Extended service life thanks to simple O-ring replacement.

All Helesul hydraulic adapters are manufactured according to ISO, SAE, and DIN standards, ensuring interchangeability, safety, and predictable field performance.

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