T-H Marine Supplies, LLC is one of the most respected names in the marine industry, manufacturing a wide range of performance-enhancing boating accessories that are proudly made in the United States. Established in 1975 in Huntsville, Alabama, the company has grown into a trusted Tier 1 supplier for virtually every major boat manufacturer in the country while also serving aftermarket distributors, marine retailers, and direct-to-consumer customers nationwide.

With an expansive catalog of thousands of products, T-H Marine’s offerings include livewell systems, outboard motor mounts, jack plates, boat rigging components, LED lighting, trolling motor accessories, deck hardware, hatches, and their signature HOT FOOT throttle system. These components are used by professional anglers, tournament fishing teams, and recreational boaters alike — all relying on the brand’s reputation for durability, precision engineering, and on-the-water performance.

T-H Marine is more than a parts supplier — it is a company built by boaters, for boaters. With a culture rooted in American values, the company is driven by real-world feedback from fishing professionals, engineers, and end-users to continuously develop products that improve the marine experience. They maintain strong internal R&D, quick-turn innovation cycles, and a hands-on approach to quality control that reflects the pride of American craftsmanship.

Over the decades, the company has expanded its operations through strategic acquisitions and product line growth, while never straying from its core mission: delivering superior marine solutions that are built to perform and built to last — right here in the USA. As of 2025, T-H Marine is celebrating 50 years of innovation, job creation, and industry leadership, reinforcing its legacy as an iconic American marine brand committed to excellence on and off the water.



Protect your boat’s backbone with a purpose-built lower transom support plate. Designed to fit the standard 10-inch lower outboard bolt pattern, it spreads the clamping force of your engine across a wider area so your transom isn’t taking the punishment alone.

Whether you’re repowering, running a high‑thrust kicker, or pushing long runs in rough water, this plate helps prevent bolt bite and stress cracking by distributing loads evenly. It’s a smart upgrade for older hulls and a cheap insurance policy for new builds alike.

Built from 3/8-inch, high‑quality cast aluminum, it delivers the rigidity you want without unnecessary weight and stands up to corrosion in fresh or salt water. The smooth, universal profile installs cleanly behind your lower engine mounting bolts using standard hardware.

Trusted by serious anglers, guides, and weekend boaters, it’s a small part that makes a big difference in long-term hull integrity and resale value. Made in the USA with domestic and imported materials, it reflects the pride and know‑how of American marine manufacturing while helping you spend more time on the water and less time in the shop.

Lower Transom Support Plate for Outboard Motor Mounts

Reinforce your transom where it matters most. This lower-mount support plate uses 3/8-inch cast aluminum and a standard 10-inch bolt pattern to spread engine load, reduce stress cracks, and stop bolts from biting into the transom.

Lower Transom Support Plate for Outboard Motor Mounts

$17.76

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