{"product_id":"prop-nut-kit-for-mercury-mariner-outboards-replaces-11-69578a1-sierra-18-3702-prop-nut-tab-washer","title":"Sierra Prop Nut Kit 18-3702, Replaces Mercury 11-69578A1, for Mercury\/Mariner Outboard Motors","description":"\u003cp\u003eThe Sierra 18-3702 Prop Nut Kit is a replacement hardware kit for Mercury and Mariner outboard motors, designed to secure the propeller onto the propeller shaft. The kit is built from alloy steel with a machined finish and uses a hexagonal, external-hex drive style with a coarse, right-hand M14 metric thread, giving it a commercial grade rating suited to marine propeller hardware. Each component measures 0.39 x 0.39 x 0.39 inches and the complete kit weighs 0.12 pounds.\u003c\/p\u003e\u003cp\u003eThe kit contains the two pieces needed to reinstall a propeller correctly: a tab washer (Sierra 18-3204) and a prop nut (Sierra 18-3704). These components replace the original Mercury tab washer and prop nut, so boaters can restore the propeller mounting hardware to factory function without sourcing individual dealer parts separately. Because the nut and washer are matched to the correct thread size and profile, the kit helps prevent under- or over-torquing that can occur when mismatched hardware is used.\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 18-3702\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFastener Type:\u003c\/strong\u003e Hex\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e M14\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e Iso Metric\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Class:\u003c\/strong\u003e Coarse\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Style:\u003c\/strong\u003e Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive Style:\u003c\/strong\u003e External Hex\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eScrew Head Style:\u003c\/strong\u003e Hexagonal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade Rating:\u003c\/strong\u003e Commercial\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Pieces:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999256201\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Tab Washer (Sierra 18-3204), Prop Nut (Sierra 18-3704)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits Mercury and Mariner outboard motors.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 11-69578A1\u003c\/li\u003e\n\u003cli\u003eMercury Marine 11-69578T1\u003c\/li\u003e\n\u003cli\u003eMercury Marine 11-69578Q1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3702 Prop Nut Kit include?\u003c\/strong\u003e The kit includes a tab washer (Sierra 18-3204) and a prop nut (Sierra 18-3704), the two pieces needed to secure a propeller onto the shaft of a Mercury or Mariner outboard motor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Mercury part numbers does the 18-3702 kit replace?\u003c\/strong\u003e Sierra 18-3702 replaces Mercury 11-69578A1, 11-69578T1, and 11-69578Q1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3702 an OEM part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra aftermarket replacement kit engineered to replace the original Mercury 11-69578A1, 11-69578T1, and 11-69578Q1 prop nut hardware.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat outboard motors is this prop nut kit for?\u003c\/strong\u003e This kit is made for Mercury and Mariner outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-3702 prop nut kit made from?\u003c\/strong\u003e Both the prop nut and tab washer are made from alloy steel with a machined finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat thread size does the Sierra 18-3702 prop nut use?\u003c\/strong\u003e The prop nut uses an M14 thread with a coarse, right-hand, ISO metric thread type.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3702 Prop Nut Kit weigh?\u003c\/strong\u003e The complete kit weighs 0.12 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the components in kit 18-3702?\u003c\/strong\u003e Each component in the Sierra 18-3702 kit measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many pieces come in the Sierra 18-3702 kit?\u003c\/strong\u003e The Sierra 18-3702 Prop Nut Kit contains 4 pieces total.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the prop nut have a hex drive?\u003c\/strong\u003e Yes, the Sierra 18-3702 prop nut uses a hexagonal head with an external hex drive style.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3702 Prop Nut Kit?\u003c\/strong\u003e The UPC for the Sierra 18-3702 Prop Nut Kit is 030999256201.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy replace both the tab washer and prop nut together?\u003c\/strong\u003e Because the Sierra 18-3702 kit pairs the tab washer (18-3204) and prop nut (18-3704) together, boaters get matched replacement hardware sized correctly to the original Mercury 11-69578 series parts rather than sourcing each piece separately.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988162228443,"sku":"SIE-18-3702","price":12.6,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3702_lg__21458.1558125680.500.750.jpg?v=1785189019","url":"https:\/\/www.goodvibesmarina.com\/products\/prop-nut-kit-for-mercury-mariner-outboards-replaces-11-69578a1-sierra-18-3702-prop-nut-tab-washer","provider":"Good Vibes Marina","version":"1.0","type":"link"}