{"product_id":"sierra-18-3773-prop-nut-for-yamaha-6-20-hp-outboards-replaces-oem-90171-10m01","title":"Sierra 18-3773 Prop Nut - Replaces 90171-16011-00, 95307-16900-00 - Fits Yamaha 20-30 hp (1980 \u0026 Up)","description":"\u003cp\u003eThe Sierra 18-3773 Prop Nut is a replacement propeller nut engineered for Yamaha outboard motors. It secures the propeller onto the propeller shaft, keeping it correctly seated and preventing it from working loose under load. This prop nut is built as a direct replacement for the Yamaha OEM parts it corresponds to, so it installs using the same fit and thread engagement as the original hardware it is replacing.\u003c\/p\u003e\u003cp\u003eThis part is designated for Yamaha outboards in the 20-30 hp range, covering motors from 1980 and up. Because prop nuts are a wear item that can loosen or corrode over time from constant water exposure and vibration, keeping a correct-fit replacement on hand or in your spares kit helps avoid losing a propeller on the water. The 18-3773 ships as a single prop nut, ready to thread onto the propeller shaft during a routine propeller swap or hardware replacement.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3773\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Prop Nut\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 90171-16011-00, 95307-16900-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Yamaha 20-30 hp (1980 \u0026amp; Up)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1 pound\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282312107\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions (L x W x H):\u003c\/strong\u003e 8 x 6 x 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 prop nut per pack\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eYamaha 20-30 hp outboards (1980 \u0026amp; Up)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e90171-16011-00\u003c\/li\u003e\n\u003cli\u003e95307-16900-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3773 prop nut fit?\u003c\/strong\u003e The Sierra 18-3773 prop nut fits Yamaha outboard motors in the 20-30 hp range, covering models from 1980 and up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM Yamaha part numbers does the 18-3773 replace?\u003c\/strong\u003e It replaces Yamaha part numbers 90171-16011-00 and 95307-16900-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3773 prop nut weigh?\u003c\/strong\u003e The Sierra 18-3773 prop nut weighs 1 pound.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3773 a genuine Yamaha part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-brand aftermarket replacement made to match the fit of Yamaha part numbers 90171-16011-00 and 95307-16900-00, not a Yamaha-branded OEM part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many prop nuts come in one package?\u003c\/strong\u003e The 18-3773 is supplied as a single prop nut per pack.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3773 prop nut?\u003c\/strong\u003e The UPC listed for the Sierra 18-3773 prop nut is 808282312107.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this prop nut work on a 25 hp Yamaha outboard from 1985?\u003c\/strong\u003e Yes, the 18-3773 covers the Yamaha 20-30 hp range for motors from 1980 and up, which includes a 1985 25 hp model.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the shipped dimensions of the 18-3773 prop nut?\u003c\/strong\u003e The item dimensions listed for the Sierra 18-3773 prop nut are 8 x 6 x 4 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need any special tools to install the 18-3773 prop nut?\u003c\/strong\u003e Installation involves threading the prop nut onto the propeller shaft in place of the original Yamaha nut, the same way the OEM 90171-16011-00 or 95307-16900-00 nut installs; no special part-specific tooling is called out for the 18-3773 beyond standard prop-removal tools.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3773 the same part as Sierra 18-3709?\u003c\/strong\u003e No, the 18-3773 and 18-3709 are different Sierra prop nut part numbers with different OEM cross-references and different Yamaha fitment, so they are not interchangeable.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988165505243,"sku":"SIE-18-3773","price":4.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3773__73858.1558184988.500.750.jpg?v=1785188705","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3773-prop-nut-for-yamaha-6-20-hp-outboards-replaces-oem-90171-10m01","provider":"Good Vibes Marina","version":"1.0","type":"link"}