{"product_id":"merc-481","title":"Mercury MerCruiser Quicksilver — 5\/16-18 × 1-1\/4 in. Screw — 74824","description":"\u003ch2\u003eMercury MerCruiser Quicksilver 5\/16-18 × 1-1\/4 in. Screw 74824\u003c\/h2\u003e\n\u003cp\u003eMercury MerCruiser Quicksilver 74824 is a genuine OEM 5\/16-18 × 1.250 in. screw used in multiple Mercury Marine engine assemblies. Documented locations include alternator braces, cylinder-block and crankcase assemblies, cooling-system components, and thermostat or reservoir assemblies.\u003c\/p\u003e\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSelect Mercury and Mariner outboards\u003c\/li\u003e\n\u003cli\u003eSelect Mercury V6 outboard cylinder-block and crankcase assemblies\u003c\/li\u003e\n\u003cli\u003eMercury 240 EFI M2 Jet Drive cylinder-block applications\u003c\/li\u003e\n\u003cli\u003eMerCruiser 470 and 3.7L cooling-system and thermostat-reservoir assemblies\u003c\/li\u003e\n\u003cli\u003eSelect MerCruiser alternator-brace assemblies\u003c\/li\u003e\n\u003cli\u003eAdditional Mercury and MerCruiser assemblies whose OEM diagram specifies 74824\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFitment notice:\u003c\/strong\u003e This is a multi-application fastener. Confirm the engine or drive serial number, OEM diagram position, required quantity, and associated washers, spacers, or locking hardware before ordering.\u003c\/p\u003e\n\u003ch3\u003ePart Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent part number:\u003c\/strong\u003e 74824\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMercury reference:\u003c\/strong\u003e 10-74824\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury MerCruiser Quicksilver\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e Engine assembly screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 5\/16-18 UNC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread diameter:\u003c\/strong\u003e 0.3125 in. or 5\/16 in.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 1.250 in. or 31.75 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 745061076617\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold as:\u003c\/strong\u003e One screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEarlier reference:\u003c\/strong\u003e 53016 in select MerCruiser 470 cooling-system applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine OEM fastener\u003c\/li\u003e\n\u003cli\u003eUsed across multiple outboard and MerCruiser engine assemblies\u003c\/li\u003e\n\u003cli\u003eDiagram-specific hardware for alternator, crankcase, cooling, and thermostat applications\u003c\/li\u003e\n\u003cli\u003eSold individually for service replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace This Screw\u003c\/h3\u003e\n\u003cp\u003eReplace the screw if its threads are damaged, stretched, or stripped; the head is rounded; significant corrosion is present; the original fastener was lost; or the service procedure specifies new hardware. Do not reuse a screw that can no longer be tightened correctly.\u003c\/p\u003e\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eConfirm that 74824 is specified for the exact diagram position. Use the associated OEM washer, lock washer, or spacer where shown. Tightening torque, locking compound, and reuse limits should follow the service procedure for the particular engine assembly rather than being inferred from screw size alone.\u003c\/p\u003e\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eIs this screw limited to one engine family?\u003c\/strong\u003e\u003cbr\u003eNo. It appears in several unrelated Mercury and MerCruiser engine assemblies.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo the dimensions alone confirm fitment?\u003c\/strong\u003e\u003cbr\u003eNo. Match part number 74824 to the serial-specific diagram and exact assembly position.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre washers or spacers included?\u003c\/strong\u003e\u003cbr\u003eThis listing is for one screw. Check the OEM diagram for any separate washer, lock washer, or spacer required at the installation point.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e Replacing a missing or damaged fastener when the exact engine diagram specifies Mercury part 74824.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMost common mistake:\u003c\/strong\u003e Ordering by 5\/16-18 × 1-1\/4 in. dimensions alone and overlooking diagram-specific washers, spacers, quantity, or tightening requirements.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment guidance:\u003c\/strong\u003e Confirm the engine serial number, diagram position, quantity, and associated hardware before installation, especially on alternator-brace and cylinder-block applications.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563870617636,"sku":"74824","price":2.66,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/images_c8b8a04d-5f7c-4286-a349-cdaa26e43dea.png?v=1790106347","url":"https:\/\/marisolmarine.com\/products\/merc-481","provider":"Marisol Marine Company","version":"1.0","type":"link"}