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Sierra 18-6011 Zinc Trim Tab Anode for Mercury Mercruiser and Honda Outboards

Manufacturer

Sierra

<p>For nearly six decades, Sierra has established itself as one of the marine industry's most trusted names in aftermarket engine and drive parts. Founded as a specialized marine parts manufacturer, Sierra has grown into a comprehensive supplier of replacement components, instrumentation, and accessories for both recreational and commercial boating applications. Operating from their 300,000-square-foot distribution center in Litchfield, Illinois, Sierra serves boat owners and marine technicians worldwide with an extensive catalog of parts engineered specifically for the harsh saltwater environment.</p><h3>Marine Engine Excellence</h3><p>Sierra's reputation was built on delivering precision-engineered internal engine components and drive system parts that meet or exceed OEM specifications. Their <a href="/7570-sierra-engine-gasket-set-5404">engine gasket sets</a> provide critical sealing solutions for inboard and outboard motors, while their <a href="/7570-sierra-engine-complete-assembly-15341">engine complete assemblies</a> offer comprehensive replacement options for major overhauls. Each component undergoes rigorous testing to ensure reliability in demanding marine conditions, from corrosion resistance to temperature cycling performance.</p><h3>Instrumentation and Monitoring Systems</h3><p>Accurate instrumentation is essential for boat operators to monitor engine health and prevent costly breakdowns on the water. Sierra's comprehensive line of <a href="/7570-sierra-gauges-200483">gauges</a> includes everything from fuel pressure and temperature indicators to voltmeters and trim gauges, all designed with marine-grade materials that withstand vibration, moisture, and UV exposure. Their <a href="/7570-sierra-tachometer-gauge-1488">tachometer gauges</a> deliver precise RPM readings critical for optimizing engine performance and fuel efficiency. Supporting these instruments, Sierra's <a href="/7570-sierra-gauge-resistor-47908">gauge resistors</a> ensure proper signal conditioning and accurate readings across various sensor types and engine configurations.</p><h3>Expanded Product Portfolio</h3><p>In 2022, Sierra significantly broadened its scope beyond traditional marine engine parts to encompass a wider range of boating accessories and even outdoor power equipment components. This strategic expansion brought established marine brands like Shields and Moeller under the Sierra umbrella, creating a one-stop resource for marine maintenance and replacement parts. The company now offers fuel systems, electrical components, battery charging solutions, and NMEA electronics alongside their traditional engine parts lineup.</p><h3>Quality Backed by Industry-Leading Warranties</h3><p>What sets Sierra apart in the crowded aftermarket marine parts market is their commitment to standing behind every component they manufacture. Their warranty coverage extends beyond simple part replacement—it includes shop labor, haul-out fees, towing charges, and related incidental costs should a warrantied part fail. This comprehensive protection reflects the company's confidence in their manufacturing processes and quality control standards. For boat owners facing repairs far from shore or mechanics working on customer vessels, this peace of mind is invaluable. Whether you're maintaining an outboard motor, rebuilding an inboard engine, or upgrading your boat's instrumentation, Sierra's decades of marine industry experience and commitment to quality make them a reliable choice for keeping your vessel running at peak performance.</p>

Part Number

118-6011
06/21/2036 1:18 PM
Sale Price

$14.70

2 left at this price

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Usually delivered within 2 days

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Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-6011 is a zinc trim tab anode designed to protect your marine engine from galvanic corrosion in saltwater environments. This sacrificial anode directs corrosion away from critical components like shafts, propellers, rudders, and drive parts, preserving expensive engine components while the anode corrodes instead.

Key Features:

  • Zinc alloy construction specifically formulated for saltwater use
  • Bolt-on attachment style for secure installation
  • Meets or exceeds OEM specifications for quality and performance
  • Direct replacement for multiple OEM part numbers

Applications:

  • Fits most Mercury/Mariner outboards 35 HP and above
  • Compatible with all Mercruiser engines (except Bravo models)
  • Fits Honda extension cases BF25, BF30, BF35, BF40, BF50 (1997-up)
  • Mercruiser R/MR/Alpha One sterndrives (1983-1990 and prior drives)

Replaces OEM Part Numbers: Mercury/Mariner 31640, 31640A1, 31640A2, 31640A4, 31640B4, 72436A1, 97-31640Q4, Honda 41107-ZW1-003ZA, Mercruiser 316404

Important Note: This zinc anode is designed for saltwater applications only. For freshwater use, consider aluminum or magnesium anodes. Always inspect anode condition regularly and replace when significantly corroded to maintain proper engine protection.

If my order is delivered and is correct part all is good

Great experience... fast shipping

I found the engine mounts I needed but THM did not carry the transmission mounts I needed from the same manufacturer. I had to go directly to the manufacturer website (Innovative) to find them. THM had the best price on the engine mounts though.

The Livewell Pump arrived and worked great! Thank you.

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Only one that had the special banks twin ram gaskets I was looking for. Quick delivery. Will definitely use again.

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