Stop wasting money on aftermarket parts that fail. Invest in genuine Mercury Marine quality once – this SCREW, (.437-20 x 1.75) (Bravo)(Alpha – Closed Cooling) outlasts cheap alternatives by years.

Designed and manufactured to Mercury Marine OEM standards, this component ensures reliable operation across all engine RPM ranges. Part number 56393 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.

Cut-rate alternatives might look similar, but they’re not engineered to Mercury’s exacting standards. Part 56393 delivers consistent performance because it’s built right — the same way Mercury does it at the factory.

Compatible Mercury Marine Engines

FITS: 350-357HP MERCRUISER

• Fits MERCRUISER 350-357HP engines
• Compatible HP: 350HP, 357HP
• Covers 24 serial number ranges
• Configurations: Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

350HP Models

• 350HP MAG MPI (Mercruiser): 0M300000-0M599999, 0M600000-0W059999, 0W060000-0W309999, 0W310000-0W649999, 0W650000-1A299999, 1A300000-1A611927, 1A611928-1A623184
• 350HP MPI ALPHA (Mercruiser)
• 350HP OUTBOARD (Mercruiser): 0L331599-0M299999, 0M300000-0M599999, 0M600000-0W059999, 0W060000-0W309999, 0W310000-0W649999, 0W650000-1A299999, 1A300000-1A611927, 1A611928-1A623184, 1A300000-1A611927, 1A611928-1A623184

357HP Models

• 357HP OUTBOARD (Mercruiser)
• 357HP STROKER (Mercruiser)

Need help finding your serial number? Check our serial number location guide for step-by-step instructions on locating it on your Mercury engine.

Verification & Support

Double-check compatibility for part 56393 using our parts finder tool. Still need assistance? No worries – contact us via the buttons at the bottom of this page (text, call, or email)

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