New ISO 16028 Flat Face Hydraulic Quick Coupling, No-Spill 1/2" for 350 Bar Systems
When hydraulic equipment is working under high pressure, a Quick Coupling needs to do more than simply connect two hydraulic lines. It should be easy to handle, keep leakage under control and provide a reliable connection during repeated use.
That is why Flat Face Quick Coupling designs are becoming a practical choice for mobile and industrial hydraulic equipment. Honglun’s FF Series is anISO 16028 quick coupling designed with a flat-face valve structure to reduce fluid loss and air inclusion during connection and disconnection.
Why Choose a Flat Face Quick Coupling?
Traditional Hydraulic Couplings can leave a small amount of oil on the coupling surface after disconnection. For equipment that is frequently serviced or operates in demanding environments, this can become an unnecessary problem.
The FF Series uses a flat-face design that helps keep spillage to a minimum. The result is a cleaner connection point and less hydraulic fluid loss during routine maintenance.
Technical Note: The 1/2 inch model, FF-04, has a nominal size of 1/2", a flow rate of up to 45 L/min and a listed working pressure of 25 MPa (250 bar). Different sizes are available for different flow and pressure requirements.
| Series | DN (inch) | ISO size | Flow (l/min) | Working Pressure (Mpa) | Spillage (ml) |
|---|---|---|---|---|---|
| FF-02 | 1/4" | 6,3 | 12 | 30 | 0.008 |
| FF-03 | 3/8" | 10 | 23 | 25 | 0.01 |
| FF-04 | 1/2" | 12,5 | 45 | 25 | 0.012 |
| FF-06 | 3/4" | 16 | 74 | 25 | 0.017 |
| FF-08 | 1" | 20 | 100 | 25 | 0.02 |
| FF-10 | 1-1/4" | 25 | 189 | 25 | 0.03 |
ISO 16028 Design for Hydraulic Equipment
This ISO 16028 quick coupling is designed around the dimensions and performance requirements for flush-face hydraulic quick-action couplings. ISO 16028:2023 covers interface dimensions and performance requirements, with pressure ratings depending on coupling size.
For buyers looking for a no spill hydraulic coupling, the flat valve structure is one of the main advantages. It also makes the coupling suitable for equipment where clean hydraulic connections and quick maintenance are important.
For high-pressure projects, including applications described by buyers as hydraulic coupling 350 bar systems, the actual coupling size, working pressure and safety requirements should always be checked before selection. The correct model should be matched to the working conditions rather than selected by pressure alone.
Built for Different Hydraulic Applications

Honglun FF Series couplings are made from carbon steel and can be supplied with different surface finishes and seal options, including NBR, EPDM and FKM. The series is used across construction equipment, agriculture, industrial machinery, forestry, vehicles and other hydraulic applications.
Looking for a 1/2 Inch Hydraulic Quick Coupling?
Hejian Honglun Hydraulic Parts Co., Ltd. has been manufacturing hydraulic quick couplings since 2010. Our products cover ISO 7241-1 Series A/B, ISO 5675 and ISO 16028 standards, with interchangeable options for a range of international coupling systems. We supply customers in more than 30 countries and regions.
If you are sourcing 1/2 inch hydraulic quick coupling, flat face couplings or need help selecting a suitable model for a high-pressure hydraulic system, contact our team for specifications, pricing and OEM/ODM support.
Email: sales@hlfluid.com
Tel / WhatsApp: +86 151 2874 0096
Website: https://www.hlfluid.com/









