Attwood Snap-Lock 1.77-Inch Boat Seat Pedestals & Base

Attwood Swivl-Eze Snap-Lock is a 1.77-inch boat-seat pedestal system with a locking connection between the post and its mating components. Choosing the right part involves more than post height: you also need to identify the mounting system, whether the seat mount is included and the shape of the deck base.

How the Snap-Lock system is arranged

1. Seat mountA fixed post such as the 29130 needs the matching Snap-Lock seat mount. The adjustable 39004 and 39204 families include an integral seat mount.
2. Pedestal postThe 1.77-inch anodized-aluminum post provides the selected fixed or adjustable height. Snap-Lock posts use a locking clip to engage the appropriate base.
3. Deck socketThe base attaches to the boat deck. Attwood SP-69773 is a square stainless-steel plate; its mounting opening is not the same measurement as the outer plate.

Attwood Snap-Lock pedestal and base comparison

The fixed post is 13 inches tall. The adjustable pedestals offer a choice of 16–20 inches or 24–30 inches, depending on the exact manufacturer number. Attwood's catalog also lists both numbered and SP-prefixed packaging versions for certain models; check the individual product listing rather than assuming that the package contents are identical.

Manufacturer part Component Size or height Mount or installation detail
29130 Fixed post 13-inch fixed height Separate seat mount needed
SP-29130 Fixed post 13-inch fixed height Separate seat mount needed
39004 Adjustable pedestal 16–20-inch adjustment range Integral seat mount
SP-39004 Adjustable pedestal 16–20-inch adjustment range Integral seat mount
SP-39204 Adjustable Pro-Post 24–30-inch adjustment range Integral seat mount
SP-69773 Deck socket base 7 × 7-inch stainless plate 2¾-inch specified deck opening
Safety classification: Attwood lists the 29130, 39004 and 39204 pedestal families as Type B components: slow-speed seating, not for a helm or driver position and not for use above 5 mph. The SP-69773 base has its own AO component rating, but that rating does not upgrade the assembled seat system.

What to verify before ordering

  1. Confirm Snap-Lock: a 1.77-inch Snap-Lock pedestal is not automatically compatible with Attwood's ¾-inch Lock'N-Pin or 2⅜-inch 238 Series hardware.
  2. Choose height and configuration: the 29130 is a fixed post without an integral seat mount, while the 39004 and 39204 adjustable families include their specified seat mounts.
  3. Check the deck base: SP-69773 has a 7 × 7-inch plate and an Attwood-listed 2¾-inch deck opening. Verify fastener positions and current installation instructions before cutting or modifying the deck.
  4. Inspect locking hardware: make sure the post locking clip and base are in proper condition; do not assume a worn or differently branded component will lock correctly.
  5. Verify the complete seat assembly: part dimensions and ratings do not independently establish the safety of a mixed or incomplete installation.

Find the exact Attwood components

These product cards open the corresponding manufacturer numbers in the NewRVParts catalog. Orders ship from supplier warehouses; warehouse viewing or pickup is not available.

Other Attwood pedestal systems

If the post is a different size or uses a screw-in pin, compare the Lock'N-Pin ¾-inch post guide, Lock'N-Pin base guide or Attwood 238 Series seat mounting reference. These guides cover other systems, not confirmed substitutions for Snap-Lock parts.

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