Bronze Tumble Bolt for 2-Dog & 4-Dog Raised Bolt Hatches (Model #DB-TMBL-BRZ)

Bronze Tumble Bolt for 2-Dog & 4-Dog Raised Bolt Hatches (Model #DB-TMBL-BRZ)

The Model #DB-TMBL-BRZ is a heavy-duty, marine-grade replacement bronze tumble bolt (swing bolt) assembly engineered specifically for perimeter securement on 2-dog and 4-dog raised commercial hatches. Machined from premium, corrosion-resistant cast bronze, this pivoting fastener swings smoothly into the notched cover plate slots to deliver immediate high-torque perimeter clamping force. The natural low-friction properties of the bronze material ensure rapid manual operation and prevent thread seizure on working decks subjected to constant seawater spray and harsh weather conditions.

Key Features

  • Non-Galling Material Pairing: High-tensile bronze composition inherently prevents thread binding and mechanical galling when paired with heavy steel or stainless steel hatch nuts.
  • Corrosion-Resistant Performance: Exceptional resistance to saltwater oxidation, pitting, and crevice corrosion without requiring protective painted coatings or galvanization.
  • Pivoting Swing Design: Precision-engineered eyelet base allows for swift, unbinding mechanical movement to dramatically speed up tank entry and closure times.

Other Applications:

  • Watertight Commercial Doors: Many quick-acting or individually dogged interior and exterior marine doors use these exact 5/8" tumble bolts along the door frame perimeter to clamp the door blade shut.
  • Heavy Deck Storage Lockers: Large, weatherproof steel boxes welded onto work decks (used for storing heavy rigging gear, anchors, or safety equipment) utilize tumble bolts to hold the heavy lids secure in high seas.
  • Machinery Guard Covers & Equipment Shrouds: Heavy-duty industrial enclosures in the engine room or on winch machinery flats use tumble bolts so mechanics can quickly swing the safety guards open for servicing without misplacing loose bolts.
  • Large Sea Chests & Filter Strainers: While smaller ones use the 1/2" size, massive raw-water sea strainers and filtration chest lids use these heavy 5/8" bronze or stainless bolts to maintain tight seals under high vacuum pressure.