Automotive
Construction
Agriculture
Livestock
Planting
Spray
Male JIC x Female NPT Adapter
If your goal is to maximize fleet efficiency, reduce downtime, and ensure fast component replacement, rely on Helesul quality.
Discover how our adapters can make a difference in the field and on the road.
- Technical Details
- Applications
- Measurement Chart (JIC)
- Measurement Chart (NPT)
- Standards met: ISO 6149 and SAE J514;
- Maximum operating pressure: 420 bar (6,000 PSI);
- Operating temperature: -20°C to +100°C;
- Body material: carbon steel;
- Surface finish: trivalent zinc plating;
- Certification: ISO 9001.
Agricultural implements
- Sprayer boom cylinders — precise opening and closing.
- Hydraulic control connections in harvesters — multiple simultaneous operations without pressure loss.
- Power steering systems in tractors — fast and stable response.
Road equipment
- Dump body tipping systems — withstand pressure spikes when lifting heavy loads.
- Side mowers and sweepers — consistent hydraulic flow for extended working hours.
- Hydraulic brakes — enhanced safety with reliable sealing.
 |
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.
JIC (Joint Industry Council) hydraulic adapters are essential components in fluid power transmission systems, ensuring secure and stable connections between hoses, cylinders, and valves. Widely used in agricultural machinery and road equipment, these adapters offer international standardization, simplifying maintenance and parts replacement. Their reliability and operational efficiency have made them the preferred choice of implement manufacturers and operators worldwide.
All Helesul hydraulic adapters are manufactured in compliance with ISO, SAE, and DIN standards, ensuring interchangeability, safety, and predictable performance in the field.
