{"product_id":"mercury-spitfire-x7-21p-48-8m0151364","title":"Mercury – SpitFire X7 4-Blade Stainless Steel Propeller | 12.8\" Diameter x 21\" Pitch | Right-Hand Rotation | 4-Blade | Stainless Steel | Polished Finish | 8M0151364","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury – SpitFire X7 4-Blade Stainless Steel Propeller | 12.8\" Diameter x 21\" Pitch | Right-Hand Rotation | 4-Blade | Stainless Steel | Polished Finish | 8M0151364\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eOverview\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhen you’re chasing open water speed and precision handling, few props make your boat feel as alive as the Mercury SpitFire X7 12.8x21 Right-Hand 4-Blade Stainless Steel Propeller (8M0151364). From the moment you throttle up, you can feel it crisp acceleration, confident grip, and a smooth transition from idle to plane. It’s fast, responsive, and tuned for boaters who want to feel every ounce of performance their outboard can deliver.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThis prop isn’t just about getting there first it’s about how it feels along the way. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe SpitFire X7 turns raw power into fluid motion, offering steady lift and tight cornering without the slip or drag that slows others down. If you love running clean lines and feeling that precise control under your fingertips, this prop delivers every time.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDiameter and Pitch:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e 12.8\" Diameter x 21\" Pitch\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eRotation:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Right-Hand Rotation\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eBlade Count:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e 4-Blade Design\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMaterial:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Mercury X7 Stainless Steel Alloy (\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e30% stronger and four times more durable than standard stainless\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFinish:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Polished Stainless Steel\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eHub System:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Requires a Mercury hub kit (sold separately)\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDesign Details:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Compact diameter and aggressive blade geometry designed for exceptional acceleration, grip, and top-end speed; includes Performance Vent System (PVS) for customizable hole shot tuning\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eEngine \u0026amp; Boat Compatibility.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWorks with Mercury and Mariner 40–60 HP Command Thrust Outboards (4.25-inch gearcase)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFits Mercury 75–125 HP TwoStroke and FourStroke Outboards\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eIdeal for midsize boats, performance runabouts, and fishing rigs where quick acceleration and high-speed stability matter\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan data-preserver-spaces=\"true\"\u003eSuitable for both freshwater and saltwater applications\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance Benefits.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe SpitFire X7 12.8x21 is all about turning power into precision. Its smaller diameter and four-blade configuration give it incredible bite, letting your boat leap onto plane with purpose and confidence. Once you’re up, you’ll notice how it holds speed effortlessly, tracking straight and true even in choppy water. \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003eThe aggressive blade design grips hard in turns, delivering predictable handling whether you’re cruising light or carrying a full load.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003eAt higher speeds, this prop keeps things smooth and steady—no chatter, no vibration—just clean, controlled movement through the water. Mercury’s X7 alloy brings both muscle and resilience, flexing less under torque and resisting damage where others would give in. And with the Performance Vent System (PVS), you get to fine-tune how your boat accelerates by adjusting venting for your exact setup. It’s like personalizing your throttle response for the way you run.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eWhy is this prop a strong choice vs. alternatives?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eMercury OEM Quality:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Designed, engineered, and tested by Mercury for optimal performance and perfect fit.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003ePerformance You Can Feel:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Quick acceleration, confident grip, and steady lift make it ideal for performance-minded boaters.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eDurability That Lasts:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e X7 stainless steel is 30% \u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003estronger and four times more durable than conventional stainless,\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e resisting flex and corrosion.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eTunable Acceleration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e The PVS system lets you tailor hole shot performance to your load and conditions.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eVersatile Application:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Perfect for midsize Mercury outboards across a wide range of boats, from sport rigs to fishing setups.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eFAQ Section\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ1: Which Mercury engines does the SpitFire X7 fit?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It fits Mercury and Mariner 40–60 HP Command Thrust outboards with the 4.25-inch gearcase, as well as Mercury 75–125 HP TwoStroke and FourStroke outboards.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ2: What makes this propeller different from other Mercury options?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e The SpitFire X7 uses an exclusive X7 stainless steel alloy and a four-blade design that combines aggressive acceleration with top-end stability, outperforming most stainless props in its class.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ3: How do I know if this pitch or size is right for my boat?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e If you’re looking to lower your engine RPMs slightly at wide-open throttle or maximize top-end control and lift, the 21-pitch SpitFire X7 is an excellent match. Always verify your engine’s recommended RPM range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ4: Can this prop be used in both saltwater and freshwater?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e Yes. The polished stainless finish and corrosion-resistant X7 alloy make it a dependable performer in any environment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan data-preserver-spaces=\"true\"\u003eQ5: What hub system does it use?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan data-preserver-spaces=\"true\"\u003e It requires a Mercury hub kit (sold separately) for secure installation, smooth shifting, and vibration-free performance.\u003c\/span\u003e\u003cspan data-preserver-spaces=\"true\"\u003e                \u003c\/span\u003e\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46939633189155,"sku":"48-8M0151364","price":661.12,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/SpitfireX7_Main_b047cebe-5d46-47a1-b1d8-b26c46349f57.jpg?v=1760631419","url":"https:\/\/partsvu.com\/en-au\/products\/mercury-spitfire-x7-21p-48-8m0151364","provider":"PartsVu","version":"1.0","type":"link"}