Galvanized Strongback for 20" Single-Bolt Flush Manhole (Model #SB540-SB20)

Galvanized Strongback for 20" Single-Bolt Flush Manhole (Model #SB540-SB20)

The Model #SB540-SB20 is a heavy-duty, structural galvanized steel strongback replacement bar engineered specifically for traditional 20" single-bolt flush manholes. Designed to slide completely beneath the deck plating cutout, this rugged clamping beam features a reinforced center threaded hub that handles the massive linear tension required to seal heavy-duty tank hatches and watertight boundaries.

Key Features

  • Hot-Dip Galvanized Corrosion Protection: Thick zinc-coated finish provides ultimate defense against abrasive bilge water, chemical tanks, and heavy saltwater scaling.
  • Reinforced Mid-Span Geometry: Specially thickened center cross-section engineered to resist vertical deflection and bending moments across a 20" span under heavy hydrostatic loads.
  • Precision Machined Central Thread: Clean-cut internal threads allow for smooth, effortless engagement and rapid tightening of the single central lockdown bolt.