{"product_id":"merc-38","title":"Mercury Quicksilver Hex Head Cap Screw 10-34353 | 3\/8\"-16 x 1\" OEM MerCruiser Fastener — Pack of 5","description":"\u003ch2\u003eMercury Quicksilver Hex Head Cap Screw 10-34353 — Pack of 5\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e 10-34353 (short ref: 34353)\u003cbr\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Mercury \/ Quicksilver\u003cbr\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Hex Head Cap Screw (OEM)\u003cbr\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 3\/8\"-16 UNC coarse thread\u003cbr\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 1.00\" (under head)\u003cbr\u003e\n\u003cstrong\u003eHead Style:\u003c\/strong\u003e Hex head\u003cbr\u003e\n\u003cstrong\u003eSystem:\u003c\/strong\u003e Engine hardware — bracket, pump, pulley, and accessory drive mounting\u003cbr\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e F1867, F2202 (earlier factory references — verify by diagram)\u003cbr\u003e\n\u003cstrong\u003eSold As:\u003c\/strong\u003e Pack of 5\u003cbr\u003e\n\u003cstrong\u003eApproximate Weight:\u003c\/strong\u003e 15 g per screw \/ ~75 g per pack\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch3\u003eWhat This Part Is\u003c\/h3\u003e\n\u003cp\u003eThe Mercury Quicksilver \u003cstrong\u003e10-34353\u003c\/strong\u003e is a genuine OEM hex head cap screw called out across a wide range of MerCruiser engine, bracket, pump, pulley, and accessory mounting locations. At 3\/8\"-16 coarse thread and 1.00\" in length, it is a precision-grade fastener specified for locations where a generic hardware-store substitute is not appropriate. Sold here as a pack of 5 — useful when the diagram calls for multiple at the same assembly location.\u003c\/p\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cp\u003eAlways confirm fitment by engine serial number and diagram position before ordering. This screw appears across many diagram locations — the diagram is the definitive reference for the correct length and grade at each specific position.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eMerCruiser MCM 120 \/ 140 \/ 2.5L \/ 3.0L inline-4 — bracket and accessory mounting locations per diagram\u003c\/li\u003e\n\u003cli\u003eMerCruiser 4.3L \/ 4.3LX \/ 4.3LH V6 — bracket and pump mounting locations per diagram\u003c\/li\u003e\n\u003cli\u003eMerCruiser 5.0L \/ 5.7L \/ 350 MAG \/ 350 MAG MPI small-block V8 — accessory and pulley mounting per diagram\u003c\/li\u003e\n\u003cli\u003eMerCruiser 330 HP \/ 340 MIE \/ 370 TRS \/ 400 TRS \/ 454 MAG MPI big-block — where diagram specifies\u003c\/li\u003e\n\u003cli\u003eMerCruiser D7.3L D-Tronic 300 diesel — where diagram specifies\u003c\/li\u003e\n\u003cli\u003eAlpha and Bravo engine package accessory mounting locations — where diagram specifies\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDiagram Positions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSeawater pump mounting — see \u003ca href=\"\/products\/8131442540580\"\u003eMercury MerCruiser Seawater Pump Kit 8M0139995\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eSeawater pump pulley mounting — see \u003ca href=\"\/products\/8131443621924\"\u003eMercury MerCruiser Seawater Pump Pulley 8M0150724\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eSerpentine belt and pulley assemblies — see \u003ca href=\"\/products\/8131443654692\"\u003eMercury MerCruiser Serpentine Belt \u0026amp; Pulley Kit 8M0150824\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eAlternator, power steering pump, and accessory drive bracket mounting\u003c\/li\u003e\n\u003cli\u003eEngine-mounted sensor and accessory brackets\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDimensions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e 3\/8\"-16 UNC coarse thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength:\u003c\/strong\u003e 1.00\" (under head)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Style:\u003c\/strong\u003e Hex head cap screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWrench Size:\u003c\/strong\u003e 9\/16\" hex\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOriginal screw is missing, seized, or corroded\u003c\/li\u003e\n\u003cli\u003eThreads are stripped, cross-threaded, or the screw no longer clamps securely\u003c\/li\u003e\n\u003cli\u003eHead is rounded or damaged and cannot be properly torqued\u003c\/li\u003e\n\u003cli\u003eIncorrect hardware was previously installed at this location\u003c\/li\u003e\n\u003cli\u003eAny time the assembly is disassembled and the screw shows wear or corrosion\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eVerify mounting hole threads are clean and undamaged before installation\u003c\/li\u003e\n\u003cli\u003eCompare the removed fastener to the replacement for thread pitch, length, and head style before installing\u003c\/li\u003e\n\u003cli\u003eTorque to the specification in the Mercury service manual for the exact assembly location — torque varies by location\u003c\/li\u003e\n\u003cli\u003eDo not substitute a longer screw in blind holes — it can bottom out before the component is properly clamped\u003c\/li\u003e\n\u003cli\u003eApply thread-locking compound only where specified by the Mercury service manual for this location\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePart Number Cross-Reference\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent OEM:\u003c\/strong\u003e 10-34353\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShort Reference:\u003c\/strong\u003e 34353\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupersedes:\u003c\/strong\u003e F1867, F2202\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can I use a standard hardware-store 3\/8\"-16 x 1\" bolt instead?\u003c\/strong\u003e\u003cbr\u003eA: Not recommended for OEM-specified locations. Mercury OEM fasteners are made to specific strength grades, coatings, and dimensional tolerances for marine engine environments. A generic bolt may look identical but differ in ways that matter for long-term reliability.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between 10-34353 and other 3\/8\"-16 MerCruiser screws?\u003c\/strong\u003e\u003cbr\u003eA: Length, coating, and strength grade. MerCruiser uses multiple 3\/8\"-16 screws in different lengths (3\/4\", 1\", 1-1\/4\", etc.) across the same engine. Always match by part number and diagram position, not just thread size.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What do the superseded numbers F1867 and F2202 mean?\u003c\/strong\u003e\u003cbr\u003eA: These are earlier Mercury factory reference numbers for the same fastener. If your older parts list shows either number, 10-34353 is the current OEM replacement. Verify against the current diagram for your engine serial number.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How many screws does my engine need?\u003c\/strong\u003e\u003cbr\u003eA: Quantity varies by engine model and the number of locations where this screw appears in the diagram. Check the parts diagram for your specific engine serial number before ordering. This pack of 5 covers most common multi-fastener assembly locations.\u003c\/p\u003e\n\n\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e The pack of 5 is the right choice when you have a Mercury parts diagram calling for 10-34353 at multiple locations in the same assembly — most commonly seawater pump service, pulley assembly work, and accessory bracket replacement on small-block and big-block MerCruiser engines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCommon issues:\u003c\/strong\u003e The most frequent mistake is ordering by thread size alone. MerCruiser uses similar 3\/8\"-16 screws in multiple lengths across the same engine — always match by part number and diagram position. A second common issue is underordering — check the diagram for your engine before ordering to confirm the full quantity needed at each location.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Parts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/8131402203172\"\u003eMercury Quicksilver Hex Head Cap Screw 10-34353 | 3\/8\"-16 x 1\" OEM MerCruiser Engine Fastener\u003c\/a\u003e (single)\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131442540580\"\u003eMercury MerCruiser Seawater Pump Kit 8M0139995\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131443621924\"\u003eMercury MerCruiser Seawater Pump Pulley 8M0150724\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131443654692\"\u003eMercury MerCruiser Serpentine Belt \u0026amp; Pulley Kit 8M0150824\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131443589156\"\u003eMercury MerCruiser Power Steering Pump Pulley 8M0150723\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/8131399057444\"\u003eMerCruiser Nut OEM 24652 — Pack of 5\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":51324679454756,"sku":"34353","price":3.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/f2a232f9-0974-4b84-89bd-3ae8acc0ccb7.png?v=1788660520","url":"https:\/\/marisolmarine.com\/products\/merc-38","provider":"Marisol Marine Company","version":"1.0","type":"link"}