Springfield Mainstay Heavy-Duty 2-7/8" Air-Ride Pedestal Package, 14"–19.75", with Trac-Lock™ Swivel (1250300)

Heavy-Duty 2-7/8" Air-Ride Pedestal Package with Locking Swivel – 14" to 19.75"

The Springfield Mainstay Heavy-Duty Pedestal Package steps up to a 2-7/8" diameter post for applications that demand more strength and stability than a standard 2-3/8" system can provide. The rigid keyed aluminum post prevents rotation and delivers a rock-solid connection between the base and seat, while air-powered height adjustment lets you raise or lower the seat from 14" to 19.75" with minimal effort. The package includes the pedestal, a 9" round base, and a Trac-Lock™ locking swivel — everything needed for a complete installation. Backed by a 5-year warranty.

What's Included

• 2-7/8" air-ride pedestal with rigid keyed aluminum post
• 9" round base
• Trac-Lock™ locking swivel seat mount

Key Features

• 2-7/8" post diameter — heavy-duty construction for larger seats and demanding applications
• Rigid keyed aluminum post — prevents post rotation for a solid, stable connection
• Air-powered height adjustment — smooth raise and lower from 14" to 19.75"
• Trac-Lock™ locking swivel — 360° rotation with locking in any position
• 9" round base included — complete package, ready to install
• 5-year warranty

Compare Heavy-Duty 2-7/8" Mainstay Configurations

• Springfield Mainstay Heavy-Duty 2-7/8" Package, 14.5"–20" – with Slide & Swivel (1250301) – adds fore-aft sliding adjustment

Compare with 2-3/8" Mainstay Packages

• Springfield Mainstay Regular Package, 14"–20" – 2-3/8" with Locking Swivel
• Springfield Mainstay Regular Package, 14"–20" – 2-3/8" with Slide & Swivel
• Springfield Mainstay Low-Profile Package, 12-1/2"–15-1/2" – with Trac-Lock™ Swivel

Related Components

• Springfield Trac-Lock™ Locking Swivel – Plug-In & 2-7/8" Series
• Springfield 2-7/8" Series Trac-Lock Swivel – Non-Locking

Parts Desk Insights

Best Use Case: This is the right package for customers with heavier seats, larger boats, or high-vibration applications where a standard 2-3/8" pedestal isn’t sufficient. The 2-7/8" post diameter and keyed construction make it noticeably more rigid than the standard Mainstay series — a strong selling point for customers who have experienced wobble or flex with lighter pedestals. The 5-year warranty is a meaningful differentiator to mention at the point of sale. The key decision between this and the 1250301 Slide & Swivel version is whether the customer needs fore-aft seat positioning — if not, this swivel-only package is the right choice at a lower price point. If the customer’s application is within the standard 2-3/8" weight and size range, the 2-3/8" Regular Mainstay Package is a more economical option.