{"product_id":"thrust-washer-for-mercury-75-125-hp-outboards-replaces-13191a1-sierra-18-4221","title":"Sierra Thrust Washer 18-4221 - Replaces Mercury 13191A1, 75282A1 - Fits 4 \u0026 6 Inline 75-150 HP Outboards","description":"\u003cp\u003eThe Sierra 18-4221 is a flat thrust washer engineered as a direct replacement for Mercury Marine outboard applications. Thrust washers sit against the propeller hub to take up axial load from the prop shaft, protecting the gearcase and propeller from wear during operation. This washer is built to Mercury 4 \u0026amp; 6 Inline 75-150 HP specifications and carries a machined finish for a precise, consistent fit against the hub and shaft.\u003c\/p\u003e\u003cp\u003eConstructed with a flat washer profile, the 18-4221 measures 0.39 inches and is finished in white for easy visual identification during service. It is designed to install in place of the original Mercury thrust washer without modification, restoring correct hub spacing and thrust bearing surface on applicable outboards. Every Sierra part is backed by Sierra's customer satisfaction warranty, giving installers confidence in fit and durability for routine prop maintenance or full lower unit rebuilds.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-4221\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWasher Type:\u003c\/strong\u003e Flat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal Type:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.23 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999317681\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 13191A1, 75282A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury 4 \u0026amp; 6 Inline - 75-150 HP\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 13191A1\u003c\/li\u003e\n\u003cli\u003eMercury Marine 75282A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-4221 thrust washer fit?\u003c\/strong\u003e The 18-4221 fits Mercury 4 \u0026amp; 6 Inline 75-150 HP outboard applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-4221 a direct replacement for Mercury 13191A1?\u003c\/strong\u003e Yes, part number 18-4221 is a direct cross-reference for Mercury Marine 13191A1 and 75282A1, installing the same way as the original thrust washer.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat size is this thrust washer?\u003c\/strong\u003e The 18-4221 thrust washer measures 0.39 inches, with overall dimensions of 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-4221 made from?\u003c\/strong\u003e This thrust washer is listed with a rubber material composition and a machined finish for a consistent fit against the prop hub.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-4221 thrust washer weigh?\u003c\/strong\u003e It weighs 0.23 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-4221 thrust washer?\u003c\/strong\u003e It is finished in white, part number 18-4221.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this an OEM or aftermarket part?\u003c\/strong\u003e The 18-4221 is a Sierra-manufactured aftermarket part built to replace Mercury Marine 13191A1 and 75282A1 with equivalent form and function.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between a flat thrust washer and other washer types?\u003c\/strong\u003e The 18-4221 is a flat washer type, designed to sit flush against the propeller hub and shaft to absorb axial thrust load, unlike beveled or cupped washer designs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-4221?\u003c\/strong\u003e Ordering the 18-4221 includes one Sierra thrust washer, part number 18-4221.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-4221 come with a warranty?\u003c\/strong\u003e Yes, the 18-4221 thrust washer is covered under Sierra's customer satisfaction warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988171436251,"sku":"SIE-18-4221","price":29.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-4221_lg__73068.1558126629.500.750.jpg?v=1785188562","url":"https:\/\/www.goodvibesmarina.com\/products\/thrust-washer-for-mercury-75-125-hp-outboards-replaces-13191a1-sierra-18-4221","provider":"Good Vibes Marina","version":"1.0","type":"link"}