Combination

Combination (SS-RS) Helical Cast Transition
The transition section adapts type Square Shaft (SS) helical lead sections to type Round.

Shaft (RS) extensions. The type RS-SS combination transition is used mainly in compression applications in areas where soft/loose soils are located above hard/ dense soils. The type RS material is less susceptible to buckling, provides greater lateral capacity, and greater moment capacity, than type SS material.

A square shaft lead will allow better penetration of the helices into hard/dense material than round shaft (RS). SS reduces the occurrence of “spin-out” (loss of thrust of helices).

Bulletin 01-1104: Combination (SS-RS) Helical Cast Transition

Key Benefits

  • Tapered design allows for smoother transition
  • Reduced installing time (no tool change)
  • Transition matches torque and compression capacity of respective shafts
  • Standard hardware with SS extensions
  • Faster lead time and availability of SS
  • Meet project specifications with RS & SS
  • Spin-Out prevention
  • Inventory turnover by using existing SS Leads
  • Major cost savings over old SS to RS Transition
Key Benefits Tapered design allows for smoother transition Reduced installing time (no tool change) Transition matches torque and compression capacity of respective shafts Standard hardware with SS extensions Faster lead time and availability of SS Meet project specifications with RS & SS Spin-Out prevention Inventory turnover by using existing SS Leads Major cost savings over old SS to RS Transition The design should be prepared by a Registered Professional Engineer.

 

The design should be prepared by a Registered Professional Engineer.