Springfield 1640401 Spring-Lock Offset Extension Post, 13 Inch, 5 Inch Offset, 1-3/4 Inch Diameter

The Springfield 1640401 Spring-Lock Offset Extension Post is a 13 inch post built to add a full 5 inch offset to a boat seat, moving the seating position away from the mount for better legroom, sightlines, or console clearance. It is constructed with a hefty 1-3/4 inch diameter shaft and finished in silver, giving it a substantial, marine-grade feel that stands up to regular use aboard a boat.

This post is designed to work as part of the Spring-Lock Series: it installs with any Spring-Lock Non-Locking Seat Mount and any Non-Locking Spring-Lock Base, both sold separately. The offset design lets boat owners reposition a seat without changing the base or mount hardware already installed on the deck. Overall footprint is 7 inches by 7 inches, and the post weighs 1.8 pounds.

Specifications

• Brand: Springfield
• Manufacturer Part Number: 1640401
• Product Name: Spring-Lock Offset Extension Post
• Post Length: 13 inches
• Offset: 5 inches
• Diameter: 1-3/4 inches
• Overall Dimensions: 7 inches x 7 inches
• Weight: 1.8 pounds
• Material: Stainless Steel
• Color: Silver
• Compatible Mounts: Spring-Lock Non-Locking Seat Mounts (sold separately)
• Compatible Base: Non-Locking Spring-Lock Base (sold separately)
• UPC: 038132915008

Fitment

Universal fit with any Spring-Lock Non-Locking Seat Mount and any Non-Locking Spring-Lock Base. Mount and base are sold separately.

Frequently Asked Questions

What is the offset on the Springfield 1640401 post? The Springfield 1640401 Spring-Lock Offset Extension Post provides a full 5 inch offset, shifting the seat position away from the mounting point.

How long is the 1640401 offset post? It measures 13 inches, with a hefty 1-3/4 inch diameter shaft.

Does the 1640401 include a seat mount or base? No. The Springfield 1640401 post is used with a Spring-Lock Non-Locking Seat Mount and a Non-Locking Spring-Lock Base, both of which are sold separately.

What is the 1640401 post made of? The Springfield 1640401 Spring-Lock Offset Extension Post is built from stainless steel for durability in a marine environment.

What color is the Springfield 1640401 post? It has a silver finish.

How much does the Springfield 1640401 post weigh? It weighs 1.8 pounds.

Will this post work with a locking Spring-Lock base? No. The Springfield 1640401 is designed for use with Non-Locking Spring-Lock seat mounts and bases, not locking versions.

What are the overall dimensions of the 1640401? The Springfield 1640401 Spring-Lock Offset Extension Post has overall dimensions of 7 inches by 7 inches.

Why would I use an offset extension post instead of a standard post? An offset post like the Springfield 1640401 repositions the seat 5 inches away from the mounting base, which is useful for improving legroom, console clearance, or driving position without relocating the mount hardware.

Is the Springfield 1640401 a genuine Springfield part? Yes, the 1640401 is a genuine Springfield Spring-Lock Series offset extension post.