Couplings – 55x series

Series 55x compressed air couplings

Series 55x quick couplings are produced in stainless and acid-proof steel 316. Ball cage and valve are made of POM.

  • Made of stainless and acid-proof steel 316
  • Ball cage and valve are made of POM
  • The optimized valve system minimizes turbulence and ensures optimal airflow
  • One hand connection and disconnection

All external threaded couplings can be delivered pretreated with teflon.

55x series stainless steel coupling

Find your stainless steel coupling

Serie 550
Stainless steel 316

Internal thread Indvendig gevindArt. nr.
1/4″ BSP550-002000
1/4″ NPT550-032000*
3/8″ BSP550-004000
3/8″ NPT550-034000*
1/2″ BSP550-005000
1/2″ NPT550-035000*
External thread Udvendig gevindArt. nr.
1/4″ BSPT550-012000
1/4″ NPT550-042000*
3/8″ BSPT550-014000
3/8″ NPT550-044000*
1/2″ BSPT550-015000
1/2″ NPT550-045000*
Hose connection SlangeanslutningArt. nr.
1/4″ (6 mm)550-022000
5/16″ (8 mm)550-023000
3/8″ (10 mm)550-024000
1/2″ (13 mm)550-025000

Standard: EURO
Flow diameter: 7.8 mm


Working pressure35 bar
Burst pressure150 bar
Temperature range-20 oC to +60 oC
Flow diameter7.8 mm


HousingStainless steel 316
Ball cagePOM
Retaining ringStainless and acid resistant steel 316
Balls Stainless and acid resistant steel 316
SealsNitrile rubber
SpringsStainless steel spring wire

Nipples with EURO profile

Internal thread Hardened steelStainless steel 316
1/4″ BSP520302540302
1/4″ NPT520332540332*
3/8″ BSP520304540304
3/8″ NPT520334540334*
1/2″ BSP520305540305
1/2″ NPT520335540335*
Eksternal thread Hardened steelStainless steel 316
1/4″ BSPT520312540312
1/4″ NPT520342540342*
3/8″ BSPT520314540314
3/8″ NPT520344540344*
1/2″ BSPT520315540315
1/2″ NPT520345540345*
Hose connection Hardened steelStainless steel 316
1/4″ (6 mm)520322540322
5/16″ (8 mm)520323540323
3/8″ (10 mm)520324540324
1/2″ (13 mm)520325540325
PUR Connection Hardened steel
ø5/ø8 mm520352
ø6.5/ø10 mm520354
ø8/ø12 mm520355
ø9.5/ø13.5 mm520356

25 years warranty

It does matter which blow gun you choose.

We provide a 25-year warranty on the valve system in all Air Boy® blow guns. They are tested to 28 million activations and it is still completely airtight.

Choose an Air Boy® blow gun. It is your guarantee of quality and reliable tools you can use day after day.