Metric
Metric One-Touch Fittings Specification Overview
Metric one-touch fittings refer to push-in fittings used with pneumatic tubing in metric sizes.
Tube size is typically indicated by “Ø + number” to show the tubing outside diameter, with the unit in millimeters.
For example, Ø6 indicates tubing with a 6 mm outside diameter.
Metric one-touch fittings are based on mm tube sizes, while inch one-touch fittings are based on inch tube sizes.
Even when the dimensions appear similar, metric tubing should not be used with inch fittings, and inch tubing should not be used with metric fittings.
Some sizes may still be inserted, but differences in outside diameter may affect gripping force, sealing performance, or assembly and removal.
To understand how metric, inch, G thread, speed controller series, and other one-touch fitting categories are organized, please refer to:
→ One-Touch Fittings Overview｜Classification and Selection Criteria
Metric One-Touch Fittings Specification and Type Selection
Metric one-touch fittings are selected according to tube size, thread type, connection-end type, fitting shape, and compatible tubing.
The tube connection end should be confirmed according to the metric tube outside diameter.
If the fitting has a threaded end, the thread specification of the equipment, valve, or pneumatic component port should also be confirmed.
| Selection Criteria | Details |
|---|---|
| Tube size (mm) | Common sizes include Ø4, Ø6, Ø8, Ø10, Ø12, Ø14, and Ø16 |
| Thread |
For fittings with threaded ends, select according to the equipment, valve, or pneumatic component port. Common options include M5, M6, PT 1/8, PT 1/4, PT 3/8, and PT 1/2 |
| Connection-end type | Tube-to-tube, tube-to-thread, bulkhead connection, reducer connection, or manifold type |
| Fitting shape | Straight, elbow, tee, Y fitting, cross union, swivel, bulkhead, manifold, plug, and reducer types |
| Compatible tubing | Metric PU tubing, nylon tubing, and other pneumatic tubing with compatible metric O.D. |
Further Reading
→ Inch One-Touch Fittings｜Inch Tube Size Specification Overview
→ G Thread One-Touch Fittings｜Thread Selection for Equipment Ports
