Metric hydraulic hose fittings connect a hose assembly to metric ports, tube fittings and adapters. Correct selection requires the thread size, pitch, sealing geometry, hose specification and fitting series—not simply a measurement in millimeters.
Ruihua's listed product range includes metric male and female connections, 24-degree cone designs, O-ring options, straight and angled hose ends, metric adapters, plugs and related ferrules. Final compatibility should be confirmed using the mating-port specification and product drawing.
Common Metric Hydraulic Connection Features
Metric 24-Degree Cone
A 24-degree cone is widely used in metric hydraulic tube and hose connections. Depending on the design, sealing may involve a metal cone, cutting-ring assembly or an O-ring arrangement. The male and female components must share the intended geometry and series.
Light and Heavy Series
Metric 24-degree connections are commonly described as light or heavy series. The series affects the combination of tube outside diameter, thread size and intended application. Do not select a fitting from the thread size alone; confirm the tube or hose connection and drawing.
Metric O-Ring Connections
Some metric fittings use an O-ring to provide the primary seal. Confirm the O-ring location, groove, mating face and material compatibility before assembly.
Straight, 45-Degree and 90-Degree Hose Ends
Fitting orientation affects hose routing, bend radius and installation clearance. Select the angle before measuring hose length, and allow for the insertion depth and orientation required by the assembly procedure.
Metric Hose Fitting Selection Checklist
Required informationWhy it matters
Male or female connectionDetermines the mating component
Thread outside or inside diameterNarrows the nominal thread size
Metric pitchSeparates visually similar threads
24-degree cone, O-ring or other sealConfirms where the connection seals
Light or heavy seriesPrevents tube and thread mismatch
Hose type and sizeDetermines the compatible stem and ferrule
Straight, 45-degree or 90-degree formControls routing and installation
Working pressure and mediaSupports application review
Material and surface finishSupports environmental and compatibility requirements
Metric Product Configurations Represented on the Site
Metric female 24-degree cone hose fittings
Metric male 24-degree adapters
Metric 24-degree light- and heavy-series connections
Metric O-ring adapters and plugs
Straight and 90-degree metric connections
Metric-to-BSP and metric-to-other-system adapters
Hose ferrules for compatible hydraulic hose constructions
Product names alone are not sufficient for final selection. Use the individual product drawing to confirm dimensions and standards.
Installation and Verification Considerations
Keep threads and sealing surfaces clean and protected from damage.
Lubrication and tightening requirements depend on the connection and manufacturer procedure.
Do not use thread sealant on a connection that seals at a cone or O-ring unless the assembly specification explicitly requires it elsewhere.
Support the hose to prevent twisting and excessive side load.
Verify the assembled system using the appropriate inspection and test procedure before service.
Frequently Asked Questions
How do I know whether a metric fitting is light or heavy series?
Use the tube size, thread size and product drawing together. The thread measurement alone may not identify the series.
Are all metric hydraulic fittings 24-degree cone fittings?
No. Metric describes the thread measurement system, while the fitting may use different sealing arrangements. Confirm the sealing face.
Can a metric fitting be adapted to BSP or another thread?
Yes, purpose-designed adapters can connect different systems. Both ends and both sealing methods must be specified.
What should I send for a replacement fitting?
Send the complete part marking, photos, thread diameter, pitch, sealing-face details, hose specification and overall configuration.
Need help matching a metric hose fitting? Send the hose specification, thread measurements, sealing-face photos, tube size and required orientation. Ruihua can review the information against available product drawings and provide a suitable reference for confirmation.
Related Hydraulic Fitting Guides
