Marine U-Joint Bellows Mercury 86840A05 86840A3 8M0062406 Sierra 18-2756

Marine U-Joint Bellows for Mercury

This marine u-joint bellows is a replacement part for Mercury outboard and sterndrive applications, designed to protect the u-joint and coupler from water and debris, and directly replaces OEM numbers 86840A05, 86840A3, 8M0062406, and Sierra 18-2756.

Overview

The marine u-joint bellows for Mercury is an essential component that seals the u-joint assembly on Mercury sterndrive units, keeping water, sand, and other contaminants out while allowing full steering articulation. It is engineered to match the original dimensions and material properties, ensuring a reliable seal and long service life for boaters who need consistent performance.

Built For Performance

• Flexible bellows design accommodates steering movement without binding
• Water-resistant construction protects internal u-joint components
• Replaces OEM part numbers 86840A05, 86840A3, 8M0062406, and Sierra 18-2756
• Direct bolt-on installation for a secure fit

Specs At A Glance

Good To Know

Q: Is this a genuine Mercury part? A: No, this is an aftermarket replacement part designed to fit Mercury applications, not a genuine Mercury product.

Q: How do I know this bellows will fit my outdrive? A: Confirm your drive's serial number and existing bellows part number matches the OEM cross-references listed before ordering.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.