Mercury – Engine Mounting Screw – 10-8M2021918

The Mercury Quicksilver Engine Mounting Screw 10-8M2021918 is an OEM structural fastener used in select Mercury/MerCruiser engine mounting applications. This screw is commonly associated with MerCruiser sterndrive engine mounting diagrams, including 3.0L Alpha One style setups, where the correct fastener length and thread pattern are important for secure engine mounting.

Key Features

• Genuine Mercury/Quicksilver engine mounting screw
• Part number: 10-8M2021918
• Also referenced as 8M2021918
• Thread size: 7/16-14 coarse thread
• Length: 4-5/8″
• Listed dimensions: .437-14 x 4.625″
• Used in select engine mounting and bracket/cradle assemblies

Engine Compatibility

Used on select Mercury/MerCruiser sterndrive engine mounting applications, including MerCruiser 3.0L Alpha One configurations where this screw is shown in the engine mounting parts diagram.

Serial Number Fitment Notice

Verify fitment by engine serial number and mounting diagram before ordering. Engine mounting hardware can vary by engine package, mount style, bracket design, and production range.

When This Part Needs Replacement

Replace this mounting screw if it is bent, stretched, corroded, stripped, seized, missing, or damaged during engine mount or bracket service.

Installation Notes

Confirm thread size, length, and mounting location before installation. Inspect the mating threads, mount bracket, engine cradle, and surrounding hardware. Use Mercury service procedures for torque requirements and any approved thread treatment.

Alternate/Superseded Part Numbers

Replaces Mercury 10-32557 and 32557.

Parts Desk Insight

Engine mounting fasteners are not ideal to substitute by length alone. The thread, grade, coating, and exact mounting location all matter because this hardware supports alignment and absorbs engine vibration.

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