Southern Precision Spring manufactures heavy-duty truck and trailer springs engineered for demanding commercial fleet and OEM applications. We specialize in precision-manufactured semi-truck fifth-wheel springs, trailer landing gear springs, air hose tether springs, and heavy-duty truck mirror springs. Our commercial-grade springs are built for durability, safety compliance, and long-term performance in over-the-road trucking, freight transport, and industrial trailer operations.
With a focus on high-strength materials, consistent load performance, and reliable spring manufacturing standards, Southern Precision Spring delivers dependable replacement and OEM truck springs designed to withstand extreme road conditions and continuous fleet use.
Fifth-Wheel Springs
Fifth-wheel is the mechanism where the trailer actually connects to back of the truck.
The fifth-wheel coupling is the mechanical connection between the tractor and trailer that allows articulation (turning and pivoting).
Spring Function(s) Around the Fifth-Wheel:
-
Tension/Return Springs: Used in fifth-wheel locking mechanisms or release triggers to ensure components return to the correct position after engagement/disengagement.
-
Operating Springs: Help maintain preload on locking jaws/triggers so the kingpin engages securely.
-
Springs are not typically the large load-bearing suspension type here but small mechanical control springs in the latch/locking assembly.
Example Use Cases:
-
Main spring in a fifth-wheel trigger assembly
-
Torsion springs on latch mechanisms
-
Replacement/maintenance springs for hitch hardware
Tether Springs
Tether springs in trucking/trailer contexts are usually small extension springs or linkage springs used to:
-
Maintain tension on cables, latches, or safety devices
-
Ensure return motion of levers, pins, or latches
-
Prevent slack that could cause premature wear or unintended movement
Examples on Tractor-Trailer Systems:
-
Tensioning on landing gear pull pins (spring-loaded) for secure locking/release.
-
Tethering safety cables or pins that must return to a defined position after actuation.
-
Applications on door latches, ramps, or cargo control hardware where controlled tension is critical.
SPS’s custom extension springs are ideal for these precise tension/return requirements because they can be designed to specific load curves, cycle lifetimes, and environmental protections.
Landing Gear Springs
Landing gear (jack legs) supports the trailer when it’s not hitched to the tractor. It must be manually or mechanically raised and lowered.
Spring Roles:
-
Return/Tension Springs: Assist in pull pin mechanisms or gearbox shifters so pins engage/disengage easily.
-
Assist Springs: On some designs, springs help counterbalance the gear weight to make cranking easier (especially on heavy trailers).
-
Hinge or Linkage Springs: Aid in crank handle return or locking detents during extended operations.
Benefits of Properly Designed Landing Gear Springs:
-
Reduces operator effort
-
Improves reliability in repeated use
-
Minimizes corrosion and binding under load
Fast Path to Your Ideal Spring
Action-focused steps to move forward:
-
Outline required load, travel, environment, and space
-
Submit a quote request through www.spspring.com
-
Review design options with SPS engineering
-
Test prototypes and finalize production specs
-
Streamline supply and long-term production with SPS