Acme Screw (STM)

These self-locking, compact solar tracking jacks are designed to precisely position loads at speeds up to 3.75 inches per minute.

STM - Machine Screw Jacks
Part Number Typical Dynamic Load Capacity* Typical Static Load Capacity*
STM-2 4,000 lb. 4,000 lb.
STM-5 10,000 lb. 10,000 lb.
STM-15 30,000 lb. 30,000 lb.
STM-30 60,000 lb. 60,000 lb.

 

* Actual load capacities may vary depending on desired life and travel speed requirements.

Solar Tracking Jack Diagram - Acme

 

Machine Screw Solar Tracking Jack (STM) Dimensions (in inches)
ModelABCDEFGHJKLMNPQRSTU
STM-2 8.250 3.250 8.5 1.0 1.75 0.75 1.31 2.69 3.69 2.06 0.625 0.188 Sq x 1.0 Lg 1.88 5.5 1.250 5/16-18 5.000 0.75 1.00
STM-5 10.250 4.000 9.5 1.0 1.75 0.75 1.31 2.69 4.12 2.06 0.625 0.188 Sq x 1.0 Lg 3.00 6.0 1.250 5/16-18 5.000 1.00 1.50
STM-15 11.750 4.625 10.5 1.0 2.00 0.75 1.31 2.69 5.31 2.13 1.000 0.250 Sq x 1.25 Lg 3.75 6.5 1.375 5/16-18 5.875 1.50 1.75
STM-30 20.000 9.000 14.5 2.0 3.00 1.50 2.00 4.00 8.00 3.13 1.000 0.250 Sq x 1.25 Lg 6.00 8.0 1.750 3/8-16 8.000 2.00 2.25

  • Aluminum housing
  • Alloy screw
  • Customer to provide trunnion pins. They should be made of steel with hardness greater than 30 HRC, yield strength greater than 110 KSI, and supported within 1/16 inch of the actuator housing.
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