Attwood 278AO3AM-1 278 Series Pro Mount Boat Seat Base, 0 Degree Tilt, ABYC AO

The Attwood 278AO3AM-1 is a 278 Series Pro Mount seat base designed to support popular oversized helm seats with a heavy-duty cast construction. Built as a rigid, fixed mount with a 0 degree tilt, it provides a stable, non-sliding platform between a boat's seat pedestal and the seat itself. A wider seat interface spreads load across the mounting surface, adding pedestal robustness for larger and heavier helm seats that place greater stress on the mount. Attwood classifies this mount under ABYC Code AO. This Pro Mount version is the fixed-tilt counterpart to Attwood's 278 AirGlide Slider mounts, which add fore-and-aft sliding adjustment; the 278AO3AM-1 instead delivers a solid, non-moving base for boaters who prioritize stability over adjustability. It corresponds to OEM part number 763499, making it a straightforward replacement when that reference number is called for. The mount measures 14.65 x 8.74 x 5.16 inches and weighs 3.3333 pounds. It is sold under UPC 022697278296 and is categorized as a seat pedestal mount, intended for boaters upgrading or replacing worn seat bases who need the added strength of a heavy-duty casting beneath an oversized helm seat.

Specifications

• Brand: Attwood
• Manufacturer Part Number: 278AO3AM-1
• Mount Type: Pro Mount (fixed, non-sliding)
• Tilt Angle: 0 Degree
• ABYC Code: AO
• Weight: 3.3333 pounds
• Product Dimensions: 14.65 x 8.74 x 5.16 inches
• UPC: 022697278296
• Category: Seat Pedestal Mount
• OEM Cross Reference: 763499

Fitment

Universal seat pedestal mount; no engine, make, or model-specific fitment is specified.

Replaces (OEM)

• 763499

Frequently Asked Questions

What is the Attwood 278AO3AM-1 used for? The 278AO3AM-1 is a 278 Series Pro Mount seat base that mounts between a boat's seat pedestal and helm seat, giving oversized helm seats a rigid, heavy-duty support point.

Does the 278AO3AM-1 tilt or slide? No. The 278AO3AM-1 Pro Mount is a fixed base with a 0 degree tilt angle and does not slide fore or aft; Attwood's separate AirGlide Slider mounts (such as the 278AOZAM-1) add that sliding adjustment.

What OEM part number does the Attwood 278AO3AM-1 replace? The Attwood 278AO3AM-1 corresponds to OEM part number 763499.

How much does the 278AO3AM-1 seat mount weigh? The Attwood 278AO3AM-1 weighs 3.3333 pounds.

What are the dimensions of the Attwood 278AO3AM-1? The 278AO3AM-1 measures 14.65 x 8.74 x 5.16 inches.

What is the ABYC code for the 278AO3AM-1? Attwood classifies the 278AO3AM-1 under ABYC Code AO.

Is the 278AO3AM-1 rated for oversized helm seats? Yes, the 278AO3AM-1's heavy-duty casting and wider seat interface are built to support popular oversized helm seats.

What material is the Attwood 278AO3AM-1 made from? The 278AO3AM-1 features a heavy-duty cast construction; Attwood's published data does not specify the exact casting material.

What is the UPC for the Attwood 278AO3AM-1? The Attwood 278AO3AM-1 is sold under UPC 022697278296.

How is the 278AO3AM-1 different from the 278 AirGlide Slider mounts? The 278AO3AM-1 is the fixed Pro Mount version with a 0 degree tilt, while Attwood's 278 AirGlide Slider mounts (278AOZAM-1 and 278AOZAGS-1) add fore-and-aft sliding motion instead of a fixed base.

Does the 278AO3AM-1 include mounting hardware in the box? Attwood's published specifications for the 278AO3AM-1 do not list included hardware or accessories.