T-H Marine Z-Lock™ 4" Set Back Manual Single Adjust Jack Plate

The T-H Marine Z-Lock™ 4" Set Back Manual Single Adjust Jack Plate delivers the structural integrity and anti-slip design that serious boaters demand when raising or trimming their outboard engine. Built from aircraft-grade aluminum, this manual jack plate features the proprietary Z-Lock™ design—matching slotted extrusions that lock side plates firmly in place, eliminating the side slippage that can occur under heavy use or variable sea conditions. The 4-inch setback positioning optimizes weight distribution for boats requiring balanced hull trim without excessive stern leverage.

Manual single-adjust operation keeps this system simple and reliable—no electric motors to corrode in salt air, no electronic components to fail. The precise engineering of the Z-Lock mechanism ensures repeatable positioning and prevents the gradual vertical drift that plagues cheaper jack plates during long offshore runs. Aircraft-grade aluminum resists corrosion far better than standard materials, critical for saltwater environments where galvanic attack and oxidation degrade equipment quickly. At 26.6 lbs, the integrated design balances durability with manageable weight for installation and removal.

This jack plate suits both weekend anglers targeting coastal structure and serious offshore fishermen navigating variable sea states. Dual-fuel rigs, heavy transom-mounted electronics, and high-horsepower outboards all benefit from a stable, non-slip trim platform. The Z-Lock design addresses the real-world problem of plate creep—the incremental downward movement that throws off engine angle and burns extra fuel. Boaters who have upgraded to modern locking jack plates report noticeably tighter steering response and more predictable trim behavior than older pin-lock or friction-only designs.