8M0168885 Spanner Nut – Mercury 65-150 HP 4-Stroke

The 8M0168885 Spanner Nut (a.k.a. Retainer Bearing) is a genuine Mercury OEM part that secures the lower unit on Mercury 65 to 150 HP 4-stroke 4-cylinder outboard models. It replaces part numbers 8M0030785, 8M0141332, 53-8M0168885, and WSM 984‑106, ensuring direct fit and restoring factory tolerance.

Manufactured to exact OEM standards, this spanner nut provides resilient locking power and reliable gearcase alignment. Technicians often rely on it to maintain tight assembly under high RPM and vibration loads. Its precision design also delivers quiet operation and longevity.

Key Features:

• OEM quality – guarantees perfect fit and durable performance

• Cross-references – replaces 8M0030785, 8M0141332, 53-8M0168885, WSM 984‑106

• Compatibility – Mercury 65–150 HP 4-stroke 4-cylinder outboards

• Robust build – corrosion-resistant marine-grade alloy

• Secure locking – maintains lower-unit integrity under load

At Arizona Outboard Dismantlers, we specialize in genuine and aftermarket marine parts that keep you on the water. The 8M0168885 Spanner Nut delivers trusted OEM quality and durable operation for every boating adventure.