Nitto Type Quick Couplings — The Workshop Standard You Probably Already Use
By RUICHEN PNEUMATIC | July 25, 2026
If you’ve used compressed air tools in Asia or Australia, you already know this coupling. It’s the Japanese standard. Push to connect, pull to release. That’s it.
Nitto style quick coupling socket — push-to-connect, single-action design.
Nitto in 30 Seconds
| What | Details |
|---|---|
| Connection | Push to connect, pull sleeve to release |
| Threads | BSPT / BSPP (not NPT!) |
| Common sizes | 1/4″ (7.5mm bore), 3/8″, 1/2″ |
| Max pressure | 15-20 bar |
| Materials | Hardened steel, brass, 304/316 stainless |
Where You’ll Find It
Garage swapping impact wrench for a blow gun. Factory line doing quick tool changes. Workshop with air sanders and nail guns. Construction site on portable compressors. Food plant with stainless for washdown. It’s everywhere.
Pick the Right Material
Steel (black oxide). Workhorse. Takes abuse. Most shops pick this.
Brass. Cheaper. Fine for light use. Gets loose if you connect/disconnect all day.
Stainless (304/316). Costs more but won’t rust. Food, pharma, marine.
Three Mistakes People Make
- Mixing profiles. Nitto plugs won’t fit American or European couplers. Pick one standard and stick to it.
- Wrong threads. Nitto uses BSP. Not NPT. They look almost the same but won’t seal. Thread angle is different (55 vs 60 degrees).
- Going too small. 1/4″ handles most tools. Need more airflow for sanders or spray guns? Step up to 3/8″ or 1/2″.
Need Nitto couplings? We’ve got steel, brass, and stainless. Check them at cnruichen.com/nitto-quick-coupling/