{"product_id":"q-p-spindle-assembly-for-50-mower-deck-direct-fit-replacement-with-bolt-5-8-18-thread","title":"q\u0026p Spindle Assembly for 50\" Mower Deck — Direct-Fit Replacement with Bolt, 5\/8\"-18 Thread","description":"\u003cp\u003e\u003cstrong\u003eThe q\u0026amp;p Spindle Assembly w\/Bolt is a direct-fit replacement spindle that restores blade mounting and rotation on 50\" deck MTD and compatible zero-turn mowers.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf a worn or damaged deck spindle is causing vibration, poor cut quality, or preventing blades from threading on properly, this q\u0026amp;p assembly provides the core rotating hub and bolt needed to get the deck back into service. Engineered to replace several OEM part numbers, the unit includes the spindle housing and mounting bolt and is designed for models that use a 50\" mowing deck, so you can swap it in without extensive modifications.\u003c\/p\u003e\n\n\u003ch3\u003eWhich machines and OEM parts does this replace?\u003c\/h3\u003e\n\u003cp\u003eThis spindle assembly is manufactured to match the form, fit and function of multiple original-equipment parts from MTD and related brands. It fits a range of 50\" deck-equipped residential and commercial lawn tractors and zero-turn models, making it a versatile spare for common maintenance tasks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReplaces OEM numbers: MTD 918-06980, 618-06980, 285-707 and equivalent references.\u003c\/li\u003e\n  \u003cli\u003eCompatible models include RZT-L50, LX50, S50, S50KH, XT1-GT50, XT1-ST54 and ZT-L50 with a 50\" deck.\u003c\/li\u003e\n  \u003cli\u003eDesigned for MTD model frames with parts lists 14A7A3ZQ099 and 17ARCBDQ099.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key dimensions and thread specifications?\u003c\/h3\u003e\n\u003cp\u003eUnderstanding the spindle’s dimensions ensures you order the correct replacement and that the blade and pulley align properly. This q\u0026amp;p unit provides the size and thread pitch commonly used on 50\" decks so the pulley, blade and mounting holes line up with factory locations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOverall spindle height: 6.8 inches for proper belt and blade clearance.\u003c\/li\u003e\n  \u003cli\u003eMain bolt thread: 5\/8\"-18 UNF, matching factory blade bolts and hardware.\u003c\/li\u003e\n  \u003cli\u003ePulley outer diameter (OD): 5.0 inches to maintain belt alignment and tension.\u003c\/li\u003e\n  \u003cli\u003eMounting holes are tapped for easier installation and accurate torqueing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow difficult is the installation and what tools are needed?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for anyone comfortable with deck service — you’ll remove the deck, take off the old spindle, and bolt in the replacement. Because the mounting holes are tapped and the bolt thread matches common OEM fasteners, reassembly is quicker and requires only basic hand tools.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTypical tools: socket set, torque wrench, breaker bar, wood block to secure blade during removal.\u003c\/li\u003e\n  \u003cli\u003eNo special machining or modification is required—the unit is a direct-replacement design.\u003c\/li\u003e\n  \u003cli\u003eFollow mower manufacturer torque specs for spindle bolts and use thread-lock where recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The q\u0026amp;p Spindle Assembly w\/Bolt is intended for homeowners, groundskeepers and small-tractor owners who need a reliable replacement part for 50\" deck mowing systems. It’s a good match if you own one of the listed MTD-compatible models and want a cost-effective, OEM-equivalent spindle that simplifies repairs and helps restore proper blade operation and deck performance.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this spindle fit XT1-GT50 and XT1-ST54 models?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It fits XT1-GT50 and XT1-ST54 models equipped with a 50\" deck listed in the compatible model range.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What bolt thread size does the assembly use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The included bolt uses a 5\/8\"-18 UNF thread, matching common OEM blade fasteners.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"q\u0026p","offers":[{"title":"Default Title","offer_id":56832273023316,"sku":"B07RZQD2YT","price":75.43,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/qp-spindle-assembly-front-view_d2399af6-4019-4f95-9720-568b15bf2ba4.jpg?v=1787026045","url":"https:\/\/gardenluxe.co.uk\/products\/q-p-spindle-assembly-for-50-mower-deck-direct-fit-replacement-with-bolt-5-8-18-thread","provider":"Gardenluxe Uk","version":"1.0","type":"link"}