High Moment Capacity
Robust bearing support carries heavy loads and sidewall forces alike, so the actuator — not an external structure — absorbs the moment loads your application generates.
The general-purpose workhorse
SRA Series hydraulic rotary actuators
Our broadest line of helical gear rotary actuators, covering the torque ranges most rotation applications call for.
Overview
Inside the SRA Series
The SRA Series is the core of the SungJi Hydraulics line: patented helical gear rotary actuators engineered to deliver more output torque and higher moment capacity than the competitor units they replace — from a package that is lighter and externally identical.
Because the outside dimensions match industry-standard envelopes, an SRA actuator is a true drop-in upgrade. The patented differences are all internal: precision-cut helical gearing, oil-immersed bearings that never need grease, and sealing built for dust, rain, and washdown.
Series Benefits
The SJH advantages, in every SRA unit
Long Service Life
Oil-immersed bearings, high-precision assembly, and sealing that keeps out dust and rain add up to actuators that keep working season after season, in the environments that wear competitors out.
No Grease Filling Required
Because the bearings run immersed in oil, they lubricate themselves. No grease points, no lube schedules, no missed maintenance — a real advantage for rental fleets and remote equipment.
Light and Compact
A space-efficient helical gear design with fewer components delivers the same — or more — torque from a lighter, smaller package, freeing up payload and simplifying your mounting envelope.
Free Over-Run Protection
Paired with a counterbalance valve, rotation stops the instant the maneuvering bar stops — no drift, no coasting, and no external brakes to buy, mount, or maintain.
Built-In Overload Protection
The counterbalance valve reacts instantly to external shocks, relieving pressure spikes before they reach your equipment — protecting the actuator, the attachment, and the carrier.
Specifications
SRA Series specifications
⚠ [SPECS TO BE INSERTED FROM CATALOG] — the table below is a
placeholder structure. Replace the rows in
src/data/products.ts with real catalog data.
| Model | Output Torque @ 3,000 psi | Max Moment Load | Standard Rotation | Weight |
|---|---|---|---|---|
| SRA-[SPEC] | [SPEC] | [SPEC] | [SPEC] | [SPEC] |
| SRA-[SPEC] | [SPEC] | [SPEC] | [SPEC] | [SPEC] |
| SRA-[SPEC] | [SPEC] | [SPEC] | [SPEC] | [SPEC] |
| SRA-[SPEC] | [SPEC] | [SPEC] | [SPEC] | [SPEC] |
Dimensions are for reference only. Certified prints supplied upon order.
Other Series
Also in the SJH line
Ready to spec the SRA Series?
Send us your torque and moment requirements and we'll confirm sizing, interchangeability with your current unit, and pricing — fast.