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$5.19
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The Sierra 18-3719 is a high-quality pinion nut designed for marine lower unit drive shaft applications. This component features 5/8"-18 thread size and requires a 1 1/16" wrench for installation, making it a critical fastening component for drive shaft assemblies in sterndrive and outboard motor lower gear housings.
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This pinion nut is commonly used in MerCruiser MR, Alpha One, and Alpha One Gen II lower gear housing assemblies, as well as OMC Sterndrive and Cobra applications. Each Sierra product meets or exceeds the original equipment part it replaces, ensuring reliable performance and durability in demanding marine conditions.
Smooth transition with a great price. Install went perfectly!
Andrew H
It was a good experience
Tony K
Very easy shopping experience for the parts I need
M Heritage
Quick and easy. Conversation with rep was easy and quick as well.
Gary T
none
Victor F
Amazing! I scoured the internet for a few days for a hard to find battery. I found it here for a few hundred dollars less & I received it the next day! I was blown away! I will use THMotorsports as a resource from here on! Thank you!
Brandon
fast shipping, easy to place an order.....
M.B.
It was fast and easy
Brenda N
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