Stop wasting money on aftermarket parts that fail. Invest in genuine Mercury Marine quality once – this TAB WASHER-SHEAVE SHAFT NUT outlasts cheap alternatives by years.

Factory-built to exact Mercury Marine specifications, this component ensures reliable operation across all engine RPM ranges. Part number 61004 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.

Factory parts exist for a reason — they work. Part 61004 undergoes rigorous Mercury Marine quality testing that aftermarket manufacturers skip. The result? Reliable performance season after season.

Compatible Mercury Marine Engines

FITS: 30-402HP MARINER, MERCURY

• Fits MARINER, MERCURY 30-402HP engines
• Compatible HP: 30HP, 35HP, 40HP, 200HP, 402HP
• Covers 24 serial number ranges
• Configurations: Jet Drive, Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

30HP Models

• 30HP JET (Mariner): 0C159200-0G589999
• 30HP JET (Mercury): 0C159200-0G589999

35HP Models

• 35HP OUTBOARD (Mercury): 6445653-0B110788

40HP Models

• 40HP OUTBOARD (Mariner)
• 40HP OUTBOARD (Mercury)

200HP Models

• 200HP OUTBOARD (Mercury): 3537531-4709592, 7012358-7098522, 8006265-8045198, 9016254-9157229

402HP Models

• 402HP OUTBOARD (Mercury): 3336258-4117709, 3339688-9076838, 3340783-7047607

Looking for your Mercury engine serial number? Our helpful guide shows you exactly where serial numbers are located on different engines.

Verification & Support

Questions about part 61004? Use our parts finder tool to verify fitment yourself. Prefer to talk to an expert? Use the contact buttons at the bottom of this page to reach our team by text, call, or email

Family-owned and operated since 1985. Best prices guaranteed – free shipping on orders over $100.