Attwood Marine Lock'N-Pin Seat Pedestal Base, For 3/4 in Posts, 7 x 7 in, ABYC Type B

Overview

The Attwood Marine Lock'N-Pin is a range of 7-inch x 7-inch boat seat pedestal bases for 3/4-inch pin seating systems. These bases provide the deck connection point for compatible Lock'N-Pin posts and seat mounts, giving boat owners a practical replacement or installation option for fishing seats, helm seats, and passenger seating where a removable pedestal setup is used.

The square base format uses a 2.75-inch deck mounting hole on the 7-inch x 7-inch configurations, which is an important fit check before cutting or replacing an existing base. Threaded and non-threaded versions are available, along with several material and finish options for different deck locations and corrosion exposure.

Key features

• 7-inch x 7-inch square base format for Lock'N-Pin seat pedestal installations using 3/4-inch pin posts.
• Lock'N-Pin retention helps keep the seat mount, post, and base from separating unintentionally while the boat is moving.
• 2.75-inch required deck cutout on the 7-inch x 7-inch base format helps confirm fit before drilling.
• Available in threaded and non-threaded configurations to match different 3/4-inch pedestal post styles.
• Material and finish options across the range include zinc plated steel, acetal, bronze, stainless steel, all-stainless steel, and clear-coated aluminum.
• ABYC Code B classification is used on matching Lock'N-Pin 7-inch x 7-inch base configurations for appropriate marine seating applications.

Variants

This Lock'N-Pin base range varies by threading style and material or finish. The available configurations include non-threaded, threaded, unfinished, and offset-hole versions, with material options that cover zinc plated steel, acetal, bronze, stainless steel, all-stainless steel, and aluminum with a clear coat.

The shared fit point across the range is the 3/4-inch Lock'N-Pin pedestal system and the 7-inch x 7-inch base size shown for this product family. For a clean replacement, match the selected variant to the existing post style, deck cutout, hardware pattern, and the level of corrosion exposure at the mounting location.

Installation and fit

Before installation, confirm that the deck has enough structure below the mounting area to support the seat load and the movement that comes from turning, leaning, and running in chop. The base should be mounted to a sound surface with suitable marine fasteners, and the 2.75-inch cutout should be checked against any wiring, fuel lines, flotation, or backing material below the deck.

For replacement work, the most important checks are the 3/4-inch post diameter, the threaded or non-threaded post style, and the depth available below the deck. Threaded and non-threaded bases can differ in how the pedestal engages the bushing, so matching the old base style keeps the seat system working as intended.

Materials and use on board

The range gives installers several material choices for different boat layouts. Stainless steel and all-stainless versions make sense in exposed cockpits, fishing decks, and other wet areas where washdowns and spray are common. Zinc plated steel, bronze, acetal, and clear-coated aluminum variants give additional options for matching the original hardware or the boat builder's seating setup.

This base family is a good match for boat owners replacing a worn pedestal base, refitting deck seating, or standardizing removable seats across fishing and utility positions. It is especially useful when the boat already uses the Attwood Lock'N-Pin 3/4-inch seating system and the goal is to keep the existing posts and seat mounts compatible.