North America's Most Popular Subterranean Parking System


Harding Steel’s unique CARPARX ST-3 subterranean parking system allows two conventional vehicles to be parked in secure, below-grade parking locations while allowing a third vehicle to be parked on the surface space above the machine. The ST3 features a large, single-acting scissors lift assembly powered by four hydraulic RAM cylinders.

The ST-3 requires a below grade pit structure that is built to Harding Steel's specifications. Adequate pit depth and ceiling clearance is necessary for these systems.

All ST-3 systems are built to order and custom configured to each project.


  • Commercial grade design and materials

  • Single, high-capacity scissors architecture for unsurpassed stability and reliability

  • Four high-capacity hydraulic cylinders

  • Lower level platforms can move vehicles weighing up to 6000 pounds.

  • Upper level platform creates a protective steel plate over the opening in the garage floor that will also support a vehicle weighing up to 6000 pound capacity per platform.

  • Suitable for indoor or outdoor installation (with select outdoor modifications)

  • Integrated 220V high-flow hydraulic power pack and controls

  • Oversize all diamond-plate steel platforms

  • Quality epoxy paint finish throughout

  • Optional front railing


  • Platforms are free of all trip hazards, pit gaps, or protruding columns

  • Steel maintenance locks

  • Key-operated control switches for security and safety

  • Hydraulic velocity fuses on all cylinders

  • Automatic shut-off if operator releases the key-switch

  • Optional sensor and interlock kits available

  • Transport systems must be properly enclosed and/or gated for safe operation.


Harding Steel provides complete design support for architects, builders, and construction professionals on all aspects of pit construction and facility design for all VTS systems. Harding Steel also provides complete delivery, installation, and commissioning services throughout North America.



contact us today to see how we can create a solution for your project.