{"product_id":"merc-549","title":"Mercury MerCruiser — 7\/16-20 x 1-1\/2 in. Flange Screw — 805159","description":"\u003ch2\u003eMercury MerCruiser Flange Screw 805159 | 7\/16-20 × 1-1\/2 in.\u003c\/h2\u003e\n\u003cp\u003eThe Mercury MerCruiser \u003cstrong\u003e805159\u003c\/strong\u003e is a genuine OEM 7\/16-20 × 1.500 in. flange-mounting screw used in select MerCruiser transmission and driveline assemblies. Mercury parts diagrams show it securing 5-inch transmission flange assemblies, including Hurth and Borg Warner transmission installations.\u003c\/p\u003e\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHurth 630 \/ 800 transmissions\u003c\/li\u003e\n\u003cli\u003eBorg Warner 5000 transmissions\u003c\/li\u003e\n\u003cli\u003e5-inch transmission flange configurations\u003c\/li\u003e\n\u003cli\u003e350 MAG MPI MIE\u003c\/li\u003e\n\u003cli\u003e5.7L MPI MIE\u003c\/li\u003e\n\u003cli\u003e6.2L MX MPI Horizon\u003c\/li\u003e\n\u003cli\u003e8.2L inboard\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eConfirm your engine serial number, transmission model, and flange diameter before ordering. MerCruiser diagrams use different screws for 4-inch and 5-inch flanges; 805159 is specifically shown with the 5-inch flange configuration.\u003c\/p\u003e\n\u003ch3\u003ePart Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePart number: 805159\u003c\/li\u003e\n\u003cli\u003eFull service number: 10-805159\u003c\/li\u003e\n\u003cli\u003eBrand: Mercury Marine\u003c\/li\u003e\n\u003cli\u003eOfficial product type: Transmission flange screw\u003c\/li\u003e\n\u003cli\u003eThread: 7\/16-20\u003c\/li\u003e\n\u003cli\u003eLength: 1.500 in. \/ 38.1 mm\u003c\/li\u003e\n\u003cli\u003eSystem: Transmission \/ driveline\u003c\/li\u003e\n\u003cli\u003eTypical quantity: 4 per flange assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e32993 — 7\/16 in. lock washer, used with this screw\u003c\/li\u003e\n\u003cli\u003e79476A-series — 5-inch flange assemblies\u003c\/li\u003e\n\u003cli\u003e68101 — Screw used with applicable 4-inch flange instead\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen This Part Needs Replacement\u003c\/h3\u003e\n\u003cp\u003eReplace the screw if the threads or head are damaged, corrosion is significant, or it cannot be tightened correctly. Inspect all flange fasteners whenever the transmission coupling is serviced.\u003c\/p\u003e\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eInstall with the correct flange, lock washer, and related hardware shown in the Mercury diagram. Applicable assemblies use lock washer 32993 with 805159. Tighten according to the MerCruiser service specification for the specific transmission and flange assembly.\u003c\/p\u003e\n\u003ch3\u003eAlternate\/Superseded Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e805159 — current OEM part number\u003c\/li\u003e\n\u003cli\u003e10-805159 — full Mercury service number\u003c\/li\u003e\n\u003cli\u003e52498 \/ 10-52498 — superseded by 805159\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow many screws does a flange assembly need?\u003c\/strong\u003e Diagrams typically call for 4 per flange assembly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit a 4-inch flange?\u003c\/strong\u003e No. If you are working on a 4-inch flange configuration, MerCruiser specifies a different screw (68101); 805159 is for the 5-inch flange.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e This screw is the right fastener when servicing a MerCruiser transmission coupling that uses a 5-inch flange, such as applicable Hurth or Borg Warner installations.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon mistake:\u003c\/strong\u003e The most common mistake is selecting a fastener by length alone. MerCruiser uses a different screw for 4-inch flanges, so matching the flange diameter and OEM number is more reliable than matching thread length.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSizing and fitment:\u003c\/strong\u003e If you are unsure whether your transmission uses a 4-inch or 5-inch flange, confirm against your engine serial number and parts diagram before ordering, and replace lock washer 32993 alongside this screw.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563872911396,"sku":"805159","price":7.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/58baa91d-d67d-48ac-bf64-6103fd691d98.png?v=1790277085","url":"https:\/\/marisolmarine.com\/products\/merc-549","provider":"Marisol Marine Company","version":"1.0","type":"link"}