Automotive
Construction
Agriculture
Livestock
Planting
Spray
90º Male Elbow Adapter JIC x NPT
Any connection failure can lead to costly downtime, productivity losses, and safety risks. This is where Helesul DKO (Double Cone O-ring) hydraulic adapters stand out as the strategic choice for manufacturers and operators who demand reliability, delivering a robust solution built on versatility, superior sealing, and global compatibility.
- Technical Details
- Applications
- Size Table (JIC)
- Size Table (NPT)
- Standards Compliance: 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 (+40°F to +248°F)
- Body Material: Carbon steel Surface
- Finish:Trivalent zinc plating O-Ring
- Seal: NBR 90 Shore A
- Certification: ISO 9001
Harvesters and agricultural sprayers
In boom arm circuits and hydraulic control systems exposed to constant vibration and uneven terrain, DKO hydraulic adapters maintain a stable seal, mitigate soil contamination caused by oil leaks, and reduce corrective maintenance. The dual sealing system withstands rapid cycles and pressure spikes typical of field maneuvers, preserving overall system efficiency.
Tractors and soil preparation implements
In the cylinders of reversible plows, leveling harrows, and subsoilers, the 24° profile with O-ring provides a robust connection against impacts and cyclic loads, ensuring precise actuation response. Torque repeatability minimizes loosening and sustains productivity throughout long working shifts.
Dump trucks and highway trucks
During tipping operations of dump bodies and platforms, DKO fittings support safe, continuous performance by maintaining a complete seal throughout repetitive cycles. Their high torque resistance helps preserve assembly integrity after maintenance procedures and periodic fleet inspections.
Brush cutters and side sweepers
Exposed to dust, debris, and temperature fluctuations, articulated arm systems benefit from the resilient sealing performance of the O-ring and conical seat, reducing microleaks and maintaining stable pressure. This extends maintenance intervals and optimizes equipment availability.
Presses and compactors
In machines operating under continuously high pressure, dual sealing prevents progressive fluid loss that can compromise force and speed. The result is a more consistent cycle, lower oil consumption, and improved hourly output, especially in continuous industrial operations.
 |
Nominal Size |
External Thread (d) [mm] |
Internal Thread (D) [mm] |
|
7/16"-20 |
11,1 |
9,7 |
|
|
1/2"-20 |
12,7 |
11,3 |
|
|
9/16"-18 |
14,3 |
12,8 |
|
|
3/4"-16 |
19,1 |
17,3 |
|
|
7/8"-14 |
22,2 |
20,3 |
|
|
1.1/16"-12 |
27,0 |
24,7 |
|
|
1.3/16"-12 |
30,2 |
27,9 |
|
|
1.5/16"-12 |
33,3 |
31,0 |
|
|
1.5/8"-12 |
41,3 |
39,0 |
|
|
1.7/8"-12 |
47,6 |
45,3 |
|
|
2.1/2"-12 |
63,5 |
61,5 |
|
|
Nominal Size |
External Thread (d) [mm] |
Internal Thread (D) [mm] |
|
7/16"-20 |
11,1 |
9,7 |
|
|
1/2"-20 |
12,7 |
11,3 |
|
|
9/16"-18 |
14,3 |
12,8 |
|
|
3/4"-16 |
19,1 |
17,3 |
|
|
7/8"-14 |
22,2 |
20,3 |
|
|
1.1/16"-12 |
27,0 |
24,7 |
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.
A JIC hydraulic adapter is a standardized connection component that uses a 37° conical thread (according to ISO 6149). It connects hoses, cylinders and valves in hydraulic systems, ensuring metal-to-metal sealing without the use of rubber rings. Widely adopted in agricultural, road machinery and industrial equipment.
JIC uses a 37° conical thread and metal-to-metal seal, while standards such as SAE use cylindrical threads. JIC offers greater resistance to high pressures (up to 280 bar), lower risk of leaks under vibration and guaranteed international compatibility. Therefore, it is preferred in agricultural implements and equipment that operate in severe conditions.
No. There are three completely different thread standards (BSP 55°, JIC 37°, SAE 45°). Mixing standards results in unsafe connections, leaks and permanent damage to components. Always check the standard of your system before any replacement. Although conversion adapters exist, they can introduce restriction points into the flow.
NPTF has tighter tolerance and can seal without sealant in fuels. For hydraulics, NPT with PTFE tape offers better cost-benefit and ease of maintenance.
Use PTFE tape if the connection will be retightened periodically. Prefer anaerobic sealant for permanent sealing and greater vibration resistance.
The conical geometry causes the sides of the thread to compress against each other as it is tightened, creating a metallic barrier that is complemented with PTFE tape or anaerobic sealant.
DKO ADAPTERS
In agricultural hydraulic circuits, sealing failures can bring a combine harvester to a complete stop in the middle of harvest season, resulting in 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 with an O-ring for consistent performance in agricultural machinery and road applications. With a robust construction, they reduce leaks, simplify assembly, and maximize equipment availability — 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.
At the core of every high-performance agricultural machine or road-going implement, the integrity of the hydraulic system is non-negotiable.
