when fully extended to 19 inches, how much top tube is still in the base tube? I want to make sure there won't be wobble.

Not sure how much tube is in the base without taking the cover off my boat. But my seats are not wobbly at all, very sturdy.

What screw dimensions do you recommend for attaching to 3/4” plywood flooring?

The seat mount is drilled for 5/16" bolts. I chose to drill them out and use 3/8" because I already had them in stock. Mine are Machine screws, Phillips oval head, Stainless steel 18-8, 3/8"-16 x 2-1/2".

ONHI Aluminum Adjustable Height Locking Boat Seat Pedestal 13-Inch to 19-Inch,Silver Polished

ONHI Aluminum Adjustable Height Locking Boat Seat Pedestal 13-Inch to 19-Inch,Silver Polished

Product ID: 650288356

Details

Brand
ONHI
Colour
Boat Seat
Material
Aluminium
Orientation
Drivers Side
Vehicle Service Type
Boat

📏13-19 inch adjustable height

🔄360° swivel rotation

🛡️Anodized aluminum corrosion-resistant

Description

⚓ Elevate your boating game with comfort and control!

ROCK SOLID STABILITY - 9" diameter base with precision mounting holes ensures maximum support and shock absorption.
BUILT TO BRAVE THE WAVES - Durable anodized aluminum with polished finish resists corrosion and withstands marine conditions.
SMOOTH 360 SWIVEL MOBILITY - Effortlessly rotate your seat to access every corner of your boat with a secure locking knob.
TAILORED COMFORT AT EVERY INCH - 7 lock-in height positions from 13" to 19" for perfect visibility and ergonomic support.
UNIVERSAL FIT PROFESSIONAL GRADE - Compatible with all seat brands and meets Class AD safety standards for peace of mind.

The ONHI Aluminum Adjustable Height Locking Boat Seat Pedestal offers a versatile 13"-19" height range with 7 secure positions, a 360° swivel for enhanced mobility, and a robust anodized aluminum build that resists corrosion. Its 9" diameter base provides stable support, fitting all seat brands and meeting Class AD safety standards, making it the ultimate upgrade for serious boaters seeking durability and ergonomic comfort.

Specifications

ASIN	B09MRW4HTQ
Auto Part Orientation	Drivers Side
Brand	ONHI
Brand Name	ONHI
Colour	Boat Seat Pedestal
Compatible with Vehicle Type	Boat
Country of Origin	USA
Customer Reviews	4.8 out of 5 stars 71 Reviews
Fit Type	Universal Fit
Item Weight	7 Pounds
Manufacturer	ONHI
Material	Aluminium
Material Type	Aluminium
Orientation	Drivers Side
Seat Width	19.0
UPC	793811441802
Vehicle Service Type	Boat

Reviews

K**S

best seller

funciona maravillosamente , recomendó a todos

17.02.2026

M**.

Quality made

1.12.2025

C**R

Great

6.12.2025

L**N

Very Durable

1.11.2025

U**N

It's ok

25.05.2025

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