Sierra 18-4210 Prop Cone for Volvo Penta AQ200-290 Stern Drives, Replaces 854045-2, VOLVO 850785-7

The Sierra 18-4210 Prop Cone is a replacement propeller cone designed for Volvo Penta stern drive applications, including AQ200, 250, 270, 270T, 275, 280, 280T, 280PT, and 290 models. The prop cone fits over the propeller hub and shaft assembly, streamlining water flow behind the propeller to improve efficiency and reduce drag during operation. As a wear item that is exposed to constant water contact and occasional impact during propeller service, the prop cone should be inspected whenever the propeller is removed for maintenance or replacement.

This Sierra prop cone is built as a direct equivalent to the original Volvo Penta parts it replaces, so it installs using the same fit and mounting method as the OEM component. It is sold as a single unit and is intended for stern drive owners performing propeller service, replacing a damaged or corroded cone, or restoring lower unit components to original specification.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-4210
• Product Name: Prop Cone
• Weight: 0.36 pounds
• Unit Count: 1
• UPC: 030999317575

Fitment

• Volvo Penta AQ200
• Volvo Penta AQ250
• Volvo Penta AQ270
• Volvo Penta AQ270T
• Volvo Penta AQ275
• Volvo Penta AQ280
• Volvo Penta AQ280T
• Volvo Penta AQ280PT
• Volvo Penta AQ290

Replaces (OEM)

• VOLVO 850785-7
• 854045-2

Frequently Asked Questions

What is the Sierra 18-4210 prop cone used for? It is a propeller cone that mounts over the propeller hub on Volvo Penta stern drives, streamlining water flow behind the propeller and covering the shaft during operation.

Which Volvo Penta stern drives does the 18-4210 prop cone fit? The Sierra 18-4210 fits Volvo Penta AQ200, 250, 270, 270T, 275, 280, 280T, 280PT, and 290 stern drives.

Does the Sierra 18-4210 replace OEM Volvo Penta part numbers? Yes, the 18-4210 is a direct equivalent for Volvo Penta OEM numbers 850785-7 and 854045-2.

How much does the Sierra 18-4210 prop cone weigh? The Sierra 18-4210 prop cone weighs 0.36 pounds.

How many prop cones come in one order? One order includes a single Sierra 18-4210 prop cone, sold individually.

Is the Sierra 18-4210 a genuine Volvo Penta part or an aftermarket replacement? The 18-4210 is a Sierra-manufactured aftermarket part built to replace Volvo Penta OEM numbers 850785-7 and 854045-2, not a Volvo Penta branded part.

When should a boat owner replace the prop cone on a Volvo Penta stern drive? The prop cone should be checked and replaced if it is cracked, corroded, or missing whenever the propeller is removed for service on a compatible Volvo Penta stern drive.

Is installation of the 18-4210 prop cone straightforward for a DIY boat owner? Yes, since the Sierra 18-4210 is designed to mount using the same fit as the original Volvo Penta prop cone, it installs the same way during routine propeller service.

Is the Sierra 18-4210 covered by a warranty? The Sierra 18-4210 prop cone is covered under Sierra's manufacturer warranty against defects.

What is the UPC for the Sierra 18-4210 prop cone? The UPC for the Sierra 18-4210 prop cone is 030999317575.