SungJi Hydraulics builds patented helical gear rotary actuators that
outperform the units they replace — and bolt into the exact same
envelope. Manufactured in South Korea. Engineered, sized, and supported
right here in North America.
Every SJH hydraulic rotary actuator shares the same patented helical
gear architecture — and the same six advantages over conventional
rotator designs.
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.
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.
Drop-In Interchangeable
Same envelope. Better actuator.
SJH actuators are externally interchangeable with the competitor
units you're running today — identical outside dimensions, identical
mounting. The differences are all internal, and all patented:
precision helical gearing that delivers more torque, bearing support
that carries higher moment loads, and a lighter package with fewer
components.
No mount redesign. No new prints. Just a stronger, lighter actuator
in the same footprint — protected by U.S. and international patents.
Korean manufacturing precision, North American support
SungJi Hydraulics has built helical gear hydraulic rotary actuators
for decades, with a 60-person manufacturing team in South Korea
producing every unit to exacting quality standards. SungJi
Hydraulics N.A. — a six-person sales and technical team based in
Cranberry Township, Pennsylvania — brings that product to the US
and Canada with application engineering, sizing support, and fast
answers.
Our mission is simple: products that exceed industry quality
standards, delivered on time and priced right, backed by
engineering support that lowers your total cost of ownership.
N.A. sales & technical specialists covering the US and Canada
8
industries served, from agriculture to military
4
actuator series, all patented, all interchangeable
What Customers Say
Trusted by the people who spec rotation
“We switched from our previous supplier because the SJH units drop into the same envelope but handle noticeably higher moment loads. Two years in on our grapple line and zero warranty returns.”
— Engineering Manager, forestry equipment OEM, British Columbia
“The oil-immersed bearing design means our customers never have to grease these rotators. For rental fleets, that alone sells the product.”
— Product Manager, material handling attachments distributor, Texas
“Their North American team turned around application sizing for a marine crane project in under 48 hours. That kind of engineering support is rare at this price point.”
Send us your application details and our North American engineering team will size the right series, confirm interchangeability with your current unit, and quote it — fast.
