Steelwrist Launches SQ40: New Automatic Quick Coupler for Compact Excavators

Steelwrist has launched the SQ40, a new addition to its SQ automatic quick coupler range, designed for compact excavators. The SQ40 allows operators to quickly and safely change high-flow-powered work tools without leaving the cab, improving efficiency and reducing downtime.

Steelwrist launched its SQ automatic connection system for quick couplers and tiltrotators in 2017, introducing its solution for connecting hydraulics and electrical signals in a single movement. The SQ40 size was first introduced at Bauma 2025, marking the debut of SQ automatic connection technology for excavators in the 2–7 tonne range. At the show, the SQ40 was integrated into the quick coupler of the X07 tiltrotator and the XR7 rotor coupler.

“For the past two years, I have been running the SQ40 size on my own excavator and once you get used to not having to leave the cab when changing hydraulic-powered work tools, you never want to go back”

Said Stefan Stockhaus, Steelwrist CEO.

A critical criteria in the production of SQ40 was to ensure the flow required to power demanding hydraulic work tools. The SQ40 coupler is optimised to achieve a flow of 70 l/min thanks to a new and innovative coupling that provides 40 per cent more flow area compared to a standard 3/8” coupling.

With the SQ40 automatic machine coupler, Steelwrist also introduces the new H6 electrical connector that builds on the years of experience with the Open-S V14 electrical connector. Large contact surfaces and strong spring-loaded pins ensure reliable electrical transmission and high current capabilities. The H6 is a 6-pin electrical connector, fully integrated into the locking wedge of the SQ40. Its molded design ensures environmental sealing, providing reliable protection against dust, moisture, and harsh jobsite conditions. The contacts’ core is hardened Phosphor Bronze, which results in effective corrosion-resistant properties when exposed to harsh conditions, as well as a hardness similar to steel to ensure a long service life.

The SQ40 follows the symmetrical S40 standard, ensuring full compatibility with existing work tools. Its modular design simplifies hose routing and allows male couplings to be installed directly into the rear shaft of the attachment, making it easy to upgrade existing setups and adapt to a wide range of hydraulic tools.

Steelwrist Launches SQ40: New Automatic Quick Coupler for Compact Excavators published on The HeavyQuip Magazine.