Male DKO x Male O-Ring Elbow Adapter

At the heart of every high-performance agricultural machine or road implement, the integrity of the hydraulic system is non-negotiable. Any connection failure can lead to costly downtime, productivity losses, and safety risks.

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This is where Helesul DKO (Double Cone O-ring) hydraulic adapters stand out as the strategic choice for manufacturers and operators who demand uncompromising reliability, delivering a robust solution built on versatility, superior sealing, and global compatibility.

Technical Details
Applications
Dimensions Table (O-Ring)
Size Chart (DKO)

Technical Details

Applicable standards: DIN 2353 (L, S) / ISO 8434-1;
Outside diameters: 6 mm – 42 mm (metric tubes);
Maximum operating pressure: 420 bar (6,000 PSI);
Working temperature: -40°C to +120°C;
Body material: carbon steel;
Surface finish: trivalent zinc plating;
O-ring seal: NBR 90 Shore A;
Certification: ISO 9001.

Applications

Combine Harvesters and Agricultural Sprayers

In articulated boom circuits and hydraulic controls exposed to constant vibration and uneven terrain, DKO hydraulic adapters maintain stable sealing, mitigate soil contamination from oil, and reduce corrective interventions. The dual sealing withstands rapid cycles and field maneuver pressure spikes, preserving system efficiency.

Tractors and Soil Preparation Implements

In cylinders for reversible plows, leveling harrows, and subsoilers, the 24° profile with O-ring provides robust connections against impacts and cyclic loads, ensuring precise actuation responses. Torque repeatability minimizes loosening and sustains productivity during extended work shifts.

Dump Trucks and Road Trucks

During dump body and platform tilting, DKO connections support safe and continuous operation, maintaining full sealing throughout repetitive cycles. High torque resistance helps preserve assembly integrity after maintenance and periodic inspections in road fleets.

Mowers and Side Sweepers

Exposed to dust, debris, and temperature variations, articulated arm systems benefit from the resilient O-ring sealing and conical seat, reducing micro-leaks and maintaining stable pressure. This extends maintenance intervals and optimizes equipment availability.

Presses and Compactors

In machines with constant high pressure, dual sealing prevents progressive fluid losses that degrade force and speed. The result is more consistent cycles, lower oil consumption, and improved hourly output, especially in continuous industrial operations.

Dimensions Table (O-Ring)

	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

Size Chart (DKO)

Nominal Sizer	Tube [mm]		External Thread (d) [mm]	Internal Thread (D) [mm]
Nominal Sizer	Tube [mm]		External Thread (d) [mm]	Internal Thread (D) [mm]
	Light Series	Heavy Series
M12x1,5	6	-	12	10,4
M14x1,5	8	6	14	12,4
M16x1,5	10	8	16	14,4
M18x1,5	12	10	18	16,4
M20x1,5	-	12	20	18,4
M22x1,5	15	14	22	20,4
M24x1,5	-	16	24	22,4
M26x1,5	18	-	26	24,4
M30x2	22	20	30	27,8
M36x2	28	25	36	33,8
M42x2	-	30	42	39,8
M45x2	35	-	45	42,8
M52x2	45	38	52	49,8

FREQUENTLY ASKED QUESTIONS

Is DKO compatible with my current equipment?

In general, yes, thanks to the metric and UNF options and the use of adapters when necessary. Check the thread/port pair and the machine pattern.

What is the practical gain in the field?

Fewer microleaks, faster assembly and less rework, which translates into more available machines and lower fluid consumption throughout the life cycle.

What is the difference between DKO adapters and conventional JIC adapters?

DKO (Double Cone O-ring) adapters use a double O-ring sealing system, while traditional JICs have only one sealing cone. The DKO system reduces leaks by up to 98% and offers a useful life 3 times longer, with tolerance to multiple assembly and disassembly without loss of efficiency.

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.

In agricultural hydraulic circuits, sealing failures can bring a combine harvester to a halt in the middle of the harvest season, generating high maintenance costs. The dual O-ring sealing system helps eliminate leaks even under intense vibration and pressure spikes, reducing unplanned downtime and fluid losses by up to 95% when installed according to specifications.

The self-centering 24° cone speeds up assembly by up to 40% compared to conventional fittings, reduces rework, and improves torque repeatability.

Helesul DKO (Double Cone O-ring) hydraulic adapters are engineered for high-reliability sealing in high-pressure hydraulic systems, combining a self-centering 24° cone and O-ring for consistent performance in agricultural machinery and road applications.

With a robust construction, they reduce leaks, simplify assembly, and maximize equipment uptime even under vibration, demanding duty cycles, and harsh environments.

All Helesul hydraulic adapters are manufactured in compliance with ISO, SAE, and DIN standards, ensuring interchangeability, safety, and predictable field performance.

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