{"product_id":"74039-marine-propeller-lock-for-mercury-mercruiser-omc-3-4-inch-16-thread-size","title":"74039 Marine Propeller Lock for Mercury MerCruiser OMC 3\/4 Inch 16 Thread Size","description":"\u003cstrong\u003eThis marine propeller lock set is a propeller lock set compatible with Mercury, MerCruiser, and OMC outdrives with 3\/4\"-16 thread size and matches Part# 74039.\u003c\/strong\u003e \u003ch2\u003eProduct Overview\u003c\/h2\u003e \u003cp\u003eThis marine propeller lock set replaces your standard propeller nut to deter theft and secure your propeller. It threads onto 3\/4\"-16 propeller shafts found on many Mercury, MerCruiser, and OMC sterndrives and outboards. Boaters needing a simple, keyed deterrent rely on this marine propeller lock set for peace of mind at the dock or on the trailer.\u003c\/p\u003e \u003ch3\u003eKey Features \u0026amp; Performance\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eKeyed locking design prevents unauthorized propeller removal\u003c\/li\u003e \u003cli\u003ePrecise 3\/4\"-16 thread pitch mates securely with factory shafts\u003c\/li\u003e \u003cli\u003eHardened stainless steel components resist corrosion in salt and fresh water\u003c\/li\u003e \u003cli\u003eDirect replacement for the standard propeller nut—no modifications needed\u003c\/li\u003e \u003cli\u003eSet includes lock nut, washer, and matching installation key\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eFitment \u0026amp; Compatibility\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eMercury and MerCruiser Alpha, Bravo, and outboard drives with 3\/4\"-16 propeller shaft threads\u003c\/li\u003e \u003cli\u003eOMC Cobra and select sterndrives with 3\/4\"-16 shaft thread diameter and pitch\u003c\/li\u003e \u003cli\u003eAny marine propeller shaft meeting the 3\/4\"-16 thread specification\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eCommon Uses\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eSecuring stainless steel or aluminum propellers on trailered boats\u003c\/li\u003e \u003cli\u003eReplacing a lost or damaged propeller lock nut and key\u003c\/li\u003e \u003cli\u003eWet-slipped boats exposed to opportunistic theft\u003c\/li\u003e \u003cli\u003ePre-season commissioning and propeller inspection\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eTechnical Specifications\u003c\/h3\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number(s):\u003c\/strong\u003e 74039\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 3\/4\"-16\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatible Brands:\u003c\/strong\u003e Mercury, MerCruiser, OMC\u003c\/li\u003e \u003c\/ul\u003e \u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Does this lock set come with a key?\u003cstrong\u003e A:\u003c\/strong\u003e Yes, it includes the unique key required to install and remove the locking nut.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will this fit my Mercury outboard?\u003cstrong\u003e A:\u003c\/strong\u003e If your propeller shaft has 3\/4\"-16 threads, this lock set threads on directly without adapters.\u003c\/p\u003e \u003cp\u003e\u003cem\u003eProduct appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.\u003c\/em\u003e\u003c\/p\u003e","brand":"DURAFORCE","offers":[{"title":"Default Title","offer_id":53679678390545,"sku":"ZZ3A00749","price":94.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0250\/2446\/2929\/files\/57_60ab92c1-2af8-4a5b-8353-8bb4473e359b.jpg?v=1781652745","url":"https:\/\/www.duraforce.com\/products\/74039-marine-propeller-lock-for-mercury-mercruiser-omc-3-4-inch-16-thread-size","provider":"DURAFORCE","version":"1.0","type":"link"}