{"product_id":"sierra-18-8404-1-marine-starter-bolt-3-8-16-x-1-11-16-in-replaces-delco-13037-mercruiser-10-8083434-mercruiser-stern-drive-starters","title":"Sierra 18-8404-1 Starter Bolt, 3\/8-16 x 1-11\/16 Inch, Replaces Mercruiser 10-8053434","description":"\u003cp\u003eThe Sierra 18-8404-1 is a marine-grade starter bolt sized 3\/8 inch-16 UNC and 1 11\/16 inches (42.9 mm) in length, built to secure a stern drive starter to the engine block. It is machined from low carbon steel with a Grade 2 hardness rating, fully threaded along its entire length with a right-hand UNC thread and a Class 1A thread fit, and finished with a hex head for standard wrench or socket installation. This bolt is designed to be interchangeable with Mercruiser Stern Drive hardware numbered 10-8053434, making it a straightforward replacement when the original starter mounting bolt is corroded, stripped, or missing. Its 0.38 inch outside diameter and 3\/8-16 thread size match common stern drive starter mounting points, and the fully threaded shank provides consistent clamping force across the full bolt length. Sold as a single bolt, it is intended for buyers who need to replace one or more starter mounting bolts individually rather than purchasing a complete hardware kit. The low carbon steel construction and machined finish are built to hold up to the vibration, heat, and moisture exposure typical of a marine engine compartment.\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 18-8404-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Starter Bolt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 1 11\/16 inches (42.9 mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 3\/8 inch -16\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Class:\u003c\/strong\u003e 1A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Style:\u003c\/strong\u003e Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Coverage:\u003c\/strong\u003e Fully Threaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Style:\u003c\/strong\u003e Hex\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Low Carbon Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrade:\u003c\/strong\u003e Grade 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiameter:\u003c\/strong\u003e 0.38 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFastener Type:\u003c\/strong\u003e Hexagon Bolt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282202125\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eThis is a universal-fit starter bolt sized to fit standard 3\/8-16 starter mounting points; it is not restricted to a single engine or drive model.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eDesigned to be interchangeable with Mercruiser Stern Drive 10-8053434.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat size is the Sierra 18-8404-1 starter bolt?\u003c\/strong\u003e It is a 3\/8 inch-16 UNC bolt measuring 1 11\/16 inches (42.9 mm) long, with a 0.38 inch outside diameter, making the Sierra 18-8404-1 sized for standard stern drive starter mounting points.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-8404-1 fully threaded?\u003c\/strong\u003e Yes, the Sierra 18-8404-1 starter bolt is fully threaded along its entire 1 11\/16 inch length, so the full shank engages the mounting threads for consistent clamping force.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is this starter bolt made from?\u003c\/strong\u003e The Sierra 18-8404-1 is machined from low carbon steel with a Grade 2 hardness rating and a machined finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this bolt fit any stern drive engine?\u003c\/strong\u003e The Sierra 18-8404-1 is a universal-fit bolt sized to 3\/8-16, so it is not limited to one specific engine or drive model as long as the mounting hole matches that thread size and length.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-8404-1 the same as Mercruiser part 10-8053434?\u003c\/strong\u003e The Sierra 18-8404-1 is designed to be interchangeable with Mercruiser Stern Drive hardware number 10-8053434, so it can be used as a direct replacement for that bolt.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this come with a nut or washer?\u003c\/strong\u003e No, the Sierra 18-8404-1 is sold as a single hex head bolt only; no nut or washer is included.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat thread class and direction does the 18-8404-1 use?\u003c\/strong\u003e It has a right-hand UNC thread with a Class 1A thread fit, standard for marine starter mounting hardware.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many bolts come in an order?\u003c\/strong\u003e Each Sierra 18-8404-1 order includes one starter bolt; if two are needed for a starter, order two units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the weight of the 18-8404-1 bolt?\u003c\/strong\u003e The Sierra 18-8404-1 weighs 0.1 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-8404-1 is a genuine Sierra part, identified by Sierra part number 18-8404-1 and UPC 808282202125.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat head style does this bolt have for installation?\u003c\/strong\u003e The Sierra 18-8404-1 has a hex head, so it installs with a standard wrench or socket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this bolt be used for other marine hardware applications, not just starters?\u003c\/strong\u003e The Sierra 18-8404-1 is marketed as a starter bolt, but because it is a standard 3\/8-16 hex bolt of low carbon steel, it can be used anywhere that thread size and length are required.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988433776859,"sku":"SIE-18-8404-1","price":5.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-8404-1__71475.1722509787.500.750.jpg?v=1785189014","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-8404-1-marine-starter-bolt-3-8-16-x-1-11-16-in-replaces-delco-13037-mercruiser-10-8083434-mercruiser-stern-drive-starters","provider":"Good Vibes Marina","version":"1.0","type":"link"}