{"product_id":"prop-nut-for-force-90-hp-outboards-replaces-mercury-11-52707-sierra-18-3700-brass-propeller-nut","title":"Sierra Prop Nut 18-3700, Brass, Replaces Mercury Marine 11-52707, Fits Force Outboard 120, 125 \u0026 150 HP","description":"\u003cp\u003eThe Sierra 18-3700 is a brass propeller nut engineered as a direct replacement for the original hardware on select Force outboard motors. It secures the propeller onto the propeller shaft, providing the clamping force needed to keep the prop seated correctly during operation. The nut is finished in white and machined from brass, a material chosen for its corrosion resistance in marine environments where saltwater and freshwater exposure quickly degrade lower-grade fasteners.\u003c\/p\u003e\u003cp\u003eThis part carries a 1\/2 inch thread with Unified National Coarse (UNC) threading, a right-hand, fully-threaded design, and a hexagonal head for use with a standard socket or wrench. It is built to the same specification as the original equipment nut it replaces, so no modification is required for installation. The 18-3700 is commonly stocked alongside the 18-3200 and 18-3701 for technicians servicing a range of Force outboard horsepower classes and model years.\u003c\/p\u003e\u003cp\u003eFitment covers Force outboard motors rated 120, 125, and 150 horsepower across the specific model years and drive\/model variants listed below. Always confirm your outboard's horsepower, year, and model letter against the fitment table before ordering to ensure correct fit.\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 18-3700\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 1\/2 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e Unified National Coarse (UNC)\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\u003eScrew Head Style:\u003c\/strong\u003e Hexagonal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 4 x 1 x 5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.13 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999236944\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eForce outboard, 120 HP, 1991, All models\u003c\/li\u003e\n\u003cli\u003eForce outboard, 120 HP, L-Drive, 1990, All models\u003c\/li\u003e\n\u003cli\u003eForce outboard, 120 HP, L-Drive, 1991, models B, D\u003c\/li\u003e\n\u003cli\u003eForce outboard, 125 HP, L-Drive, 1989, All models\u003c\/li\u003e\n\u003cli\u003eForce outboard, 150 HP, 1989, All models\u003c\/li\u003e\n\u003cli\u003eForce outboard, 150 HP, 1990, model A\u003c\/li\u003e\n\u003cli\u003eForce outboard, 150 HP, 1990, models B, C, D\u003c\/li\u003e\n\u003cli\u003eForce outboard, 150 HP, 1991, All models\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 11-52707\u003c\/li\u003e\n\u003cli\u003eMercury Marine 11-52707Q1\u003c\/li\u003e\n\u003cli\u003ePleasurecraft R017066\u003c\/li\u003e\n\u003cli\u003eChrysler Force F7000\u003c\/li\u003e\n\u003cli\u003eHonda 90301-ZW1-003\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3700 prop nut fit?\u003c\/strong\u003e The Sierra 18-3700 fits Force outboard motors rated 120, 125, and 150 horsepower, across the specific model years and model-letter variants listed in the fitment table, including L-Drive versions of the 120 HP and 125 HP models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3700 a direct OEM replacement?\u003c\/strong\u003e Yes, this brass prop nut is built to replace the original equipment nut on covered Force outboards without modification, matching the original thread size and fastening design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-3700 cross-reference?\u003c\/strong\u003e The 18-3700 replaces Mercury Marine 11-52707 and 11-52707Q1, Pleasurecraft R017066, Chrysler Force F7000, and Honda 90301-ZW1-003.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the prop nut made from?\u003c\/strong\u003e Brass, machined and finished in white, which resists corrosion in both saltwater and freshwater use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat thread size does the 18-3700 use?\u003c\/strong\u003e It has a 1\/2 inch Unified National Coarse (UNC) thread, right-hand, fully threaded, with a hexagonal head for a standard wrench or socket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3700 prop nut weigh?\u003c\/strong\u003e The Sierra 18-3700 weighs 0.13 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3700 fit my Force outboard if it's a different model letter?\u003c\/strong\u003e Fitment depends on the exact horsepower, year, and model letter of your Force outboard; the 18-3700 covers specific combinations such as 120 HP 1991 all models, 150 HP 1990 models B, C, D, and others listed in the fitment table, so confirm your motor's specs against that list.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-3700 and the 18-3200 or 18-3701?\u003c\/strong\u003e 18-3200, 18-3700, and 18-3701 are separate Sierra part numbers that are often listed together for the same Force outboard applications, but 18-3700 is a distinct part number and must be matched to your motor's specific fitment row rather than substituted automatically.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-3700?\u003c\/strong\u003e The order includes one Sierra 18-3700 brass propeller nut.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3700 genuine Sierra or aftermarket?\u003c\/strong\u003e The 18-3700 is a Sierra-brand part manufactured as a replacement for the original Force outboard hardware, sold under the Sierra part number 18-3700.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the 18-3700 prop nut?\u003c\/strong\u003e It has a white finish over the machined brass body.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988162064603,"sku":"SIE-18-3700","price":12.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3700_lg__88628.1558125534.500.750.jpg?v=1785188952","url":"https:\/\/www.goodvibesmarina.com\/products\/prop-nut-for-force-90-hp-outboards-replaces-mercury-11-52707-sierra-18-3700-brass-propeller-nut","provider":"Good Vibes Marina","version":"1.0","type":"link"}