Male DKO x Male O-Ring Adapter
This is where Helesul DKO hydraulic adapters (Double Cone O-ring) stand out as the strategic choice for manufacturers and operators who demand unwavering reliability, delivering a robust solution built on versatility, superior sealing, and global compatibility.
- Technical Details
- Applications
- Size Chart (O-Ring)
- Size Chart (DKO)
- Standards complied with: DIN 2353 (L, S) / ISO 8434-1;
- External diameters: 6 mm – 42 mm (metric tubes);
- Maximum operating pressure: 420 bar (6,000 PSI);
- Operating temperature: -40°C to +120°C;
- Body material: carbon steel;
- Surface finish: trivalent zinc plating;
- O-ring: NBR 90 Shore A;
- Certification: ISO 9001.
Agricultural Harvesters and Sprayers
In articulated boom circuits and hydraulic controls exposed to constant vibration and uneven terrain, DKO hydraulic adapters maintain a stable seal, mitigate soil contamination from oil spills, and reduce corrective maintenance. The dual-seal design withstands the rapid cycles and pressure peaks typical of field maneuvers, preserving overall system efficiency.
Tractors and Tillage Implements
In cylinders of reversible plows, leveling harrows, and subsoilers, the 24° profile with an O-ring delivers a robust connection against impacts and cyclic loads, ensuring precise actuation responses. Torque repeatability minimizes loosening and sustains productivity during extended work shifts.
Dump Trucks and Highway Vehicles
For the tipping of dump bodies and platforms, DKO connections contribute to a safe and continuous operation, maintaining a total seal throughout repetitive cycles. High torque resistance helps preserve assembly integrity following periodic maintenance and inspections in highway fleets.
Brush Cutters and Side Sweepers
Exposed to dust, debris, and thermal variations, articulated arm systems benefit from the resilient sealing of the O-ring and conical seat, reducing micro-leaks and keeping pressure stable. This extends maintenance intervals and optimizes equipment availability.
Presses and Compactors
In machines handling constant high pressure, the dual seal prevents progressive fluid loss that degrades both force and speed. The result is a more consistent cycle, lower oil consumption, and better hourly yield, especially in continuous industrial operations.
|
|
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 |
![]() |
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 |
|
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.
Fewer microleaks, faster assembly and less rework, which translates into more available machines and lower fluid consumption throughout the life cycle.
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.
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.
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 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 loss 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 hydraulic adapters (Double Cone O-ring) 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, intensive 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.


