Sierra Anchor Screw Set 18-2303, Replaces 10-20518, for MerCruiser #1R, MR, Alpha, Alpha I, Gen II & Bravo Drives, Pack of 25

The Sierra Anchor Screw Set, part number 18-2303, is a package of 25 machine screws designed as anchor screws for MerCruiser I/O drive systems, covering the #1R, MR, Alpha, Alpha I, Gen II, and Bravo drive models. These fully threaded machine screws are used to secure components within the MerCruiser drive assembly and are supplied as a direct replacement for OEM part number 10-20518, letting you restore original fastening specifications during a drive service or rebuild.

Each screw set arrives sized at 0.39 x 0.39 x 0.39 inches per unit, with the full package of 25 screws weighing 0.17 pounds. Being fully threaded, the screws are ready to install without additional machining, making this set convenient to have on hand for routine MerCruiser drive maintenance, rebuilds, or when replacing lost or damaged anchor screws. Ordering the correct Sierra part number ensures fitment consistency across the covered MerCruiser drive lineup.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2303
• Product Name: Anchor Screw Set
• Package Quantity: 25 screws per package
• Fastener Type: Machine Screw
• Thread Coverage: Fully Threaded
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.17 pounds
• UPC: 808282101206

Fitment

• MerCruiser I/O drive systems: #1R, MR, Alpha, Alpha I, Gen II, and Bravo

Replaces (OEM)

• 10-20518

Frequently Asked Questions

What is the Sierra 18-2303 Anchor Screw Set used for? The Sierra 18-2303 Anchor Screw Set is a package of 25 machine screws used as anchor screws in MerCruiser I/O drive systems, covering the #1R, MR, Alpha, Alpha I, Gen II, and Bravo drive models.

Which MerCruiser drives does part number 18-2303 fit? Part number 18-2303 is designed for MerCruiser #1R, MR, Alpha, Alpha I, Gen II, and Bravo drive systems.

What OEM part number does the 18-2303 Anchor Screw Set replace? The Sierra 18-2303 Anchor Screw Set replaces OEM part number 10-20518.

How many screws come in the 18-2303 package? Each package of the Sierra 18-2303 Anchor Screw Set contains 25 screws.

What are the dimensions of each screw in the 18-2303 set? Each screw in the 18-2303 Anchor Screw Set measures 0.39 x 0.39 x 0.39 inches.

How much does the 18-2303 Anchor Screw Set weigh? The full package of the Sierra 18-2303 Anchor Screw Set weighs 0.17 pounds.

Are the screws in the 18-2303 set fully threaded? Yes, the screws in the Sierra 18-2303 Anchor Screw Set are fully threaded machine screws, ready to install without additional preparation.

Is the Sierra 18-2303 Anchor Screw Set genuine Sierra hardware? Yes, part number 18-2303 is a Sierra-manufactured Anchor Screw Set, sold as a direct replacement for the OEM screws used in the covered MerCruiser drive systems.

What fastener type is included in the 18-2303 set? The Sierra 18-2303 set includes machine screws, specifically anchor screws for MerCruiser drive applications.

Can the 18-2303 Anchor Screw Set be used for a MerCruiser drive rebuild? Yes, the 25-piece Sierra 18-2303 Anchor Screw Set is suited for MerCruiser drive maintenance and rebuild work on the #1R, MR, Alpha, Alpha I, Gen II, and Bravo models, since it replaces OEM part 10-20518.