Mercury Exhaust Riser Screw 43749

Mercury 43749 is a genuine OEM screw listed in Mercury catalog format as 10-43749. Dealer listings identify it by size as .375-16 x 5.750, and multiple listings describe it as an exhaust riser mounting screw for selected Mercury MerCruiser applications.

Key Features

• Genuine Mercury Marine / Quicksilver OEM hardware
• Part number 43749
• Mercury shorthand listing: 10-43749
• Size listed as 3/8″-16 x 5-3/4″ (.375-16 x 5.750)
• Commonly identified as an exhaust riser screw / mounting bolt.

Engine Compatibility
This screw appears across a wide range of MerCruiser applications in dealer where used listings, including selected 3.0L MPI, 350 MAG, 320 EFI GM 350 V-8, and 370 TRS GM 454 V-8 applications, among others. Because OEM hardware can be reused across many assemblies and serial breaks, fitment should always be confirmed by exact engine model and serial number before ordering.

Serial Number Fitment Notice
Please confirm compatibility in the Mercury Parts Catalog using your exact engine serial number before purchase. Mercurys official catalog is the safest way to verify the correct screw in the correct assembly diagram.

When This Part Needs Replacement
Replace this screw when the original hardware is corroded, stretched, damaged, stripped, or missing during exhaust-component service. Since this part is commonly tied to exhaust riser mounting, using the exact OEM replacement helps maintain proper clamp load and fit in a high-heat marine environment. This is a practical service inference based on the documented part type and application.

Installation Notes
Install only the exact Mercury screw specified for the assembly being serviced. Even when a fastener looks similar, thread, length, and application location matter, especially on exhaust components.

Alternate / Superseded Part Numbers

• 10-43749
• Common alternate formatting: 1043749
  No confirmed superseded Mercury part number was established from the sources reviewed.

Parts Desk Insight
Exhaust hardware is one of those small parts that is easy to underestimate. On MerCruiser exhaust assemblies, the correct length and thread matter because the fastener has to clamp properly while living in a hot, corrosive marine environment.

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