Identify Attwood Jon Boat Seat Plates, Rails & Swivels

Found a loose seat mounting plate, clamp or rail assembly in an older Jon boat? Attwood's bench mounting and swivel hardware includes several parts with distinct functions. Use the original manufacturer number, the existing fastener locations and the supporting structure to identify the right replacement.

Identify Attwood Jon-boat seat mounting parts

Part number Component Identifying feature Confirm before ordering
SP-15100 Aluminum seat plate Plate only; rails not supplied Inspect the existing rail arrangement
SP-15900 Seat plate and bench rails Includes 15-inch rails Compare bench installation and rail length
15700-3 Clamp-on swivel 7½–18-inch clamp range, 0° tilt Measure the seat support and fastening arrangement
11602D1 Quick-disconnect mount For 6¼-inch swivels and plates Verify the matching plate and seat pattern
815000 Fore/aft slide 4½ inches travel; 1⅝ inches overall height Check travel clearance and deck installation
7062-3 Offset swivel 6-inch seat offset, Type B Check whether an offset is appropriate
17720 Flat steel swivel 6¼-inch swivel, 0° tilt Measure plate and fastening holes
17721 Tilted steel swivel 7-inch swivel, 3° tilt Compare height, plate and tilt

Start by separating the bench seat hardware from other fittings. SP-15100 is a plate only, while SP-15900 includes the plate and 15-inch rails. Attwood 15700-3 is a clamp-on swivel, not a sliding rail kit. Its specified adjustment range is 7½ to 18 inches.

Swivel identification: The 17720 is listed as a 6¼-inch steel swivel with 0° tilt, and 17721 as a 7-inch swivel with 3° tilt. The 11602D1 quick-disconnect mount is specified for 6¼-inch swivels and plates; matching the nominal size is a starting point, not proof that every plate and fastener pattern fits.

Check the old mounting arrangement

  1. Look for the original MPN. Keep every character and suffix when comparing replacement parts.
  2. Identify where the hardware attaches. A bench-mounted seat plate, a clamp, a deck-mounted slide and a pedestal swivel are different installation types.
  3. Measure what remains. Check the bench and mounting surface, original rail length, swivel plate, hole spacing and clearance for moving parts.
  4. Check the intended movement. An 815000 deck slide moves a seat fore and aft by 4½ inches, while the 7062-3 offsets the seat by 6 inches; neither is simply a replacement for the other.
  5. Verify the fasteners and seat support. Make sure corrosion or damage has not compromised the existing structure or locking hardware.
  6. Check installation restrictions. The 7062-3 is listed as a Type B component, not intended for a helm or driver position. Other hardware also needs a complete-assembly compatibility assessment before installation.
  7. Check each product listing. Confirm its condition, availability and actual included components, particularly when replacing incomplete equipment.

Match part numbers to product listings

These cards link to the corresponding UsedRVParts product records. The products shown here are catalogued as Brand New; their condition should not be inferred from the store name. Eligible local viewing and pickup in Kelowna are by appointment.

More seat hardware identification guides

For post-and-base seating rather than a bench mount, compare the Attwood Lock'N-Pin posts, Snap-Lock pedestal hardware or 238 Series pedestal kits.

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