Don’t miss another weekend. This genuine Mercury Marine **COUPLING** ships fast and installs easily – get back on the water where you belong.

Factory-built to exact Mercury Marine specifications, this component ensures reliable operation across all engine RPM ranges. Part number 18643A7 is manufactured to exact Mercury Marine factory specifications for precision installation and optimal performance. Constructed from premium marine-grade materials designed to withstand harsh saltwater and freshwater environments.

Don’t risk your Mercury engine with untested aftermarket copies. OEM part 18643A7 is manufactured to Mercury Marine’s exact specifications, ensuring compatibility and performance that inferior alternatives simply can’t match.

FITS: 5-350HP MERCRUISER

• Fits MERCRUISER 5-350HP engines
• Compatible HP: 5HP, 200HP, 230HP, 260HP, 350HP
• Covers 8 serial number ranges
• Configurations: Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

5HP Models

• 5HP OUTBOARD (Mercruiser): 0B774445-0F600999, 0B773740-0F600999, 0B525982-0F600999

200HP Models

• 200HP OUTBOARD (Mercruiser): 0B525982-0B774444

230HP Models

• 230HP OUTBOARD (Mercruiser): 0B525982-0B773739

260HP Models

• 260HP OUTBOARD (Mercruiser): 0B525982-0B773739, 0B525982-0B773304

350HP Models

• 350HP OUTBOARD (Mercruiser): 0B525982-0F600999

Not sure where to find your engine’s serial number? View our serial number location guide to quickly locate it on your Mercury engine.

Not sure if part 18643A7 fits your engine? Try our parts finder tool – it’s quick and easy. Need expert help? Contact us using the buttons at the bottom of this page – text, call, or email, whatever works best for you.

40+ years of marine expertise. Low prices on factory parts with free shipping on orders over $100 (restrictions apply).