MB began in 1956 to produce, on his own drawings, the S series screw-on quick-release couplings: this is very popular in Italy but it
is also well known abroad. Now MB is the only producer in the world of the all sizes. Mechanical strength and the impossibility of
an accidental release of the male from the female make very safe the use of these screw-on couplings: they are very suitable in
heavy hydraulic applications either for adverse environment conditions or for high work pressures. Fields of application: industry,
iron industry, oil plant, earth moving machinery and similar service vehicles.
Interchangeability: according to MB internal standard
Shut-off system: poppet valve
Latching system: screw-on
Connection: screwing-on the male’s sleeve
Disconnection: screwing-off the male’s sleeve
Connectability: allowed under residual pressure
Disconnection under pressure: allowed under residual pressure
Threads: BSP – NPTF
Sizes: 1/4" , 3/8”, 1/2”, 3/4”, 1”, 1 ¼”, 1 ½”, 2”,
2.1/2”, 3”
Materials: Female in carbon steel
Sleeve and male in high grade
carbon steel
Steel hardened valve
Surface treatment:
zinc plating and Cr III passivation
Springs in C72 steel
Seals: standard NBR, on request VITON
Antiextrusion rings: PTFE
Working Temperatures: NBR -20°C +100°C
VITON -15°C +140°C
For temperature exceeding this values, the quick-release couplings will be
supplied with all components in steel.
