How it connects
Mating inflator chuck slips or threads onto outer stem threads and depresses the central spring-loaded pin to open airflow; a threaded or press-on cap seals against contamination.
Male and female halves
Male valve stem accepts female tire inflator chucks, pressure gauges, and female threaded dust caps.
Usually connects to
- tire inflator chuck
- air compressor chuck
- tire pressure gauge
- threaded dust cap
Common sizes
- Standard Schrader: 0.305 in - 32 TPI (8V1 thread, nominal 8 mm OD); large bore version is 0.482 in - 26 TPI (12V1).
Where it is used
pneumatic caster wheelsautomotive tiresbicycle tubesmotorcyclesair compressors and HVAC service ports
Variations
- TR-413 / TR-414 rubber snap-in stems
- metal clamp-in stems
- large-bore Schrader valve
How to recognise it
Cylindrical metal stem (often rubber-jacketed) with external threads, an internal spring-loaded pin flush or slightly recessed at the tip, and usually covered with a plastic or metal dust cap.
Often confused with
| Confused with | How to tell them apart |
|---|---|
| Presta valve | Presta valves are narrower (6 mm), lack an internal spring-loaded pin core, and have an external locking knurled nut on top of the valve stem. |
| Dunlop (Woods) valve | Dunlop valves have a wider base collar nut retaining an internal valve plug core rather than an internal screw-in Schrader core. |
Also called
Schrader valveAmerican valveAV valvetire valve stem
Good to know
Pneumatic casters, hand trucks, wheelbarrows, and utility wheels almost universally standardize on the standard automotive Schrader valve (8V1 / ISO 4570).
Related connections
Design with real parts
Crafti checks which parts connect, right in your browser.