{"title":"50mm Kart Axles","description":"\u003cp\u003e50mm axles are hollow rear axle tubes used in many sprint karts; diameter, wall thickness, and material hardness change how much the chassis can twist under load. This collection covers 50mm soft through hard axles plus matching two-peg and three-peg axle keys.\u003c\/p\u003e","products":[{"product_id":"ak003-swift-two-peg-axle-key-ak003","title":"Swift AK003 Two-Peg Axle Key - 50mm OTK Axles - All Classes","description":"\u003cp\u003eLocking your rear hubs securely to a 50mm OTK axle is non-negotiable for any high-performance racing kart, and the Swift AK003 Two-Peg Key delivers the exact 34mm peg spacing required for outboard positions. When your go kart motor delivers peak torque out of a tight hairpin, standard single-peg keys can shear or allow the hub to rotate, instantly killing your drive and ruining your momentum. The AK003 utilizes a dual-peg design with a precise 7.4mm peg diameter to anchor the wheel hub firmly to the axle keyway. This mechanical lock ensures that 100% of your engine's power transfers directly to the track surface without any parasitic loss through the driveline.\u003c\/p\u003e\u003ch2\u003ePrecision Engineering for OTK Drivelines\u003c\/h2\u003e\u003cp\u003eWhether you are tuning your rear track width to adjust chassis flex or rapidly swapping out kart wheels and tires for changing weather conditions, maintaining a rigid, slop-free connection at the outboard hub is absolutely critical. The Swift AK003 is precision-machined from high-grade steel to fit AXT050 series axles flawlessly, dropping into the keyway with zero binding. This exact tolerance prevents the destructive micro-movements that lead to axle scoring, hub fatigue, and eventual component failure. Just as a rigid motor mount is essential for securing your powerplant and maintaining chain alignment, this two-peg key secures your rotational mass. It is a vital safeguard against the mid-race mechanical failures that cost drivers podium finishes. Keep in mind that while the AK003 is perfect for outboard hubs, the AK004 three-peg key is required for inboard brake hubs or high-torque four-cycle drive sprockets.\u003c\/p\u003e\u003ch2\u003eSwift AK003 Technical Specifications\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExact OTK Fitment:\u003c\/strong\u003e Designed specifically for 50mm OTK axles (AXT050 series) and compatible aftermarket 50mm racing shafts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Peg Security:\u003c\/strong\u003e Features two robust 7.4mm pegs spaced at exactly 34mm center-to-center for a zero-slip outboard hub lock.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Torque Transfer:\u003c\/strong\u003e Eliminates rotational play under heavy load, easily handling the aggressive power delivery of modern racing engines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Steel Construction:\u003c\/strong\u003e Machined from hardened steel to resist shearing, crushing, and deformation during aggressive curbing or high-grip scenarios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutboard Hub Specific:\u003c\/strong\u003e Optimized strictly for outboard wheel hubs to maintain track width consistency (use AK004 for inboard\/drive hubs).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick-Swap Ready:\u003c\/strong\u003e Precision manufacturing tolerances allow for fast, binding-free axle and hub adjustments in the hot pits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Component Protection:\u003c\/strong\u003e Prevents hub slipping that can permanently score, gall, or ruin expensive 50mm chromoly racing axles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why do I need a two-peg key instead of a standard single-peg key?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Standard single-peg keys can shear or allow the hub to rotate under high torque, especially when exiting tight corners. The Swift AK003 dual-peg design provides a mechanical lock that prevents rotational play, ensuring 100% of your engine's power is transferred to the track.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the AK003 compatible with all kart axles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No, this key is specifically engineered for 50mm OTK (AXT050 series) axles. It is designed for outboard wheel hubs. It will not fit 40mm axles or inboard brake hubs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: When should I use the AK004 instead of the AK003?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should use the AK004 three-peg key for inboard brake hubs or high-torque four-cycle drive sprockets. The AK003 is strictly optimized for outboard wheel hubs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this key help prevent damage to my axle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes. By eliminating the micro-movements and rotational play that occur with inferior keys, the AK003 prevents the hub from scoring, galling, or damaging the surface of your expensive 50mm chromoly axle.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I know if my hub is properly secured?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The AK003 should drop into the keyway with zero binding. Once installed, the hub should have no rotational play. If you feel movement, check for debris in the keyway or signs of wear on the hub or axle.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ak004-swift-three-peg-axle-key-ak004\"\u003eSwift AK004 Three-Peg Key for Versatile Axle Applications\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/swift-three-peg-key-for-40mm-axles-ak004\"\u003eSwift AK004 Three-Peg Key for 40mm and 50mm Axles\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Swift","offers":[{"title":"Default Title","offer_id":52565321089342,"sku":"AK003","price":7.56,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/50mmaxles-ak003-swift-two-peg-axle-key-ak003.jpg?v=1763116206"},{"product_id":"axt050n-50mm-medium-axle-axt050n","title":"AXT050N 50mm Medium Axle for OTK Balanced Performance","description":"\u003cp\u003eMedium equilibrium for 50mm needs: The AXT050N axle, at 1030mm, slots perfectly into OTK chassis for harmonious handling.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eKey setup: Three AK003 plus one AK004 for inboard four-cycle; all AK003 for outboard (sold separately).\u003c\/li\u003e\n\u003cli\u003eMedium flex offers control without extremes, suiting mixed track profiles.\u003c\/li\u003e\n\u003cli\u003eDirect OTK fit ensures seamless power routing in drive-line systems.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eAt 1030mm, it optimizes rear spacing for balanced weight, aiding neutral steering in varied turns. This prevents over- or understeer, letting you hold apexes longer for speed edges.\u003c\/p\u003e\u003cp\u003eThe SKU AXT050N enhances axles category with versatility, easy to stock for multi-kart teams. Its build withstands session after session, minimizing disruptions.\u003c\/p\u003e\u003cp\u003eInboard keying secures against torque twists, crucial for geared applications. Drivers feel enhanced feedback, refining techniques for precise racing.\u003c\/p\u003e\u003cp\u003ePair with hubs for custom stiffness, organizing setups for specific events. This medium axle bridges comfort and performance, accelerating your path to wins.\u003c\/p\u003e\u003cp\u003eDurability in corrosive environments keeps it reliable, streamlining maintenance routines effectively.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary benefit of the AXT050N Medium Axle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The AXT050N provides a balanced \"medium\" flex, which is ideal for mixed track conditions. It helps prevent oversteer and understeer, allowing for more neutral handling and better apex control compared to soft or hard axle alternatives.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this axle compatible with all OTK chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, this is a direct-fit 50mm axle designed specifically for OTK chassis. Its 1030mm length is engineered to optimize rear spacing and power delivery within the OTK drive-line system.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How should I configure the keys for this axle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e For inboard four-cycle setups, use three AK003 keys and one AK004 key. For outboard setups, use all AK003 keys. Please note that keys are sold separately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does the medium flex affect my driving feedback?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The medium stiffness offers a compromise between comfort and performance. It provides enough feedback to help you refine your driving technique while remaining rigid enough to handle the torque demands of competitive racing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does this axle require special maintenance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The AXT050N is built for durability in racing environments. To maintain performance, keep the axle clean and inspect it regularly for signs of wear or bending after heavy impacts or long race sessions.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/axt050u-50mm-soft-axle-axt050u\"\u003e50mm Soft Axle AXT050U for OTK Chassis Flexibility\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OTK","offers":[{"title":"Default Title","offer_id":52565368242494,"sku":"AXT050N","price":232.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/50mmaxles-axt050n-50mm-medium-axle-axt050n.jpg?v=1763116219"},{"product_id":"axt050u-50mm-soft-axle-axt050u","title":"50mm Soft Axle AXT050U for OTK Chassis Flexibility","description":"\u003cul\u003e\n\u003cli\u003eSoft compliance in a 50mm package: AXT050U serves as a plug-and-play OTK chassis replacement.\u003c\/li\u003e\n\u003cli\u003eKeying options: Three AK003 and one AK004 for four-cycle inboards; four AK003 for outboards (keys separate).\u003c\/li\u003e\n\u003cli\u003eAbsorbs impacts to preserve tire contact, vital for maintaining pace over imperfections.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eDirect OTK compatibility means no mods needed, slipping into your setup for immediate flex benefits. On bumpy ovals, it smooths jolts, allowing sustained throttle for edge over stiff competitors.\u003c\/p\u003e\u003cp\u003eThis axle's softness aids in weight transfer, optimizing launches from corners with forgiving dynamics. The SKU AXT050U bolsters 50mm axles lineup, promoting organized spares for quick fixes.\u003c\/p\u003e\u003cp\u003eFor inboard applications, the mixed keys ensure secure inboard hub lock, preventing spin in variable loads. It's engineered for endurance, reducing fatigue in long heats.\u003c\/p\u003e\u003cp\u003eRacers leverage its adaptability for wet or dirt tracks, where flex prevents skids. Integrate with suspension, and handling refines, helping you navigate packs smarter.\u003c\/p\u003e\u003cp\u003eOrganizationally, standard lengths simplify storage, keeping your trailer tidy. This soft axle empowers versatile racing, turning challenges into opportunities for faster times.\u003c\/p\u003e\u003cp\u003ePrecision in key specs guarantees fit, making it a reliable choice for pros tuning for specific feels.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the AXT050U axle compatible with all OTK chassis?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the AXT050U is designed as a direct, plug-and-play replacement for standard 50mm OTK chassis setups, requiring no modifications for installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: When should I choose a soft axle over a medium or hard axle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e A soft axle is ideal for bumpy tracks, wet conditions, or dirt surfaces. Its increased flexibility helps the chassis absorb impacts, maintain tire contact, and improve weight transfer, which prevents skidding and helps you maintain speed through corners.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I configure the keyways for this axle?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e For four-cycle inboard applications, use three AK003 keys and one AK004 key. For outboard applications, use four AK003 keys. Please note that keys are sold separately.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Does the softness of this axle affect my cornering speed?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, by allowing for more chassis flex, this axle optimizes weight transfer during corner entry and exit. This provides more forgiving handling dynamics, allowing you to stay on the throttle longer compared to stiffer axle options.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/axt050n-50mm-medium-axle-axt050n\"\u003eAXT050N 50mm Medium Axle for OTK Balanced Performance\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OTK","offers":[{"title":"Default Title","offer_id":52565368504638,"sku":"AXT050U","price":232.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/50mmaxles-axt050u-50mm-soft-axle-axt050u.jpg?v=1763116220"},{"product_id":"ak004-swift-three-peg-axle-key-ak004","title":"Swift AK004 Three-Peg Key for Versatile Axle Applications","description":"\u003cul\u003e\n\u003cli\u003eThree-peg reliability: AK004 from Swift fits 40mm AXS040 series and 50mm inboards.\u003c\/li\u003e\n\u003cli\u003eBoosts grip in high-stress spots, ensuring hubs stay put during power surges.\u003c\/li\u003e\n\u003cli\u003eCross-compatible for efficient spares in axle keys category.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis key fortifies connections, directly aiding smoother power delivery for quicker laps. The SKU AK004 simplifies repairs, keeping your setup organized and race-focused.\u003c\/p\u003e\u003cp\u003eIdeal for mixed axle sizes, it prevents wear from loose fits, extending component life. Racers value its role in maintaining competitive edges consistently.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the primary advantage of the three-peg design over a standard key?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The three-peg design provides increased surface area and stability, which helps prevent hub slippage during high-torque power surges. This ensures your rear hubs remain securely locked to the axle, providing more consistent power delivery.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the AK004 compatible with both 40mm and 50mm axles?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the Swift AK004 is designed for versatile applications, fitting 40mm AXS040 series axles as well as standard 50mm inboard setups, making it a highly useful spare to keep in your karting toolbox.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How does an axle key affect my kart's handling?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e A secure axle key prevents \"play\" or movement between the hub and the axle. By eliminating this movement, you ensure that power transfer is direct and immediate, which helps maintain predictable handling and can contribute to faster, more consistent lap times.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: When should I replace my axle keys?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e You should inspect your axle keys regularly for signs of deformation, rounding, or wear. If you notice any \"slop\" or movement when the hub is tightened, the key should be replaced immediately to prevent damage to the axle keyway and the hub itself.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/swift-40mm-soft-axle-axs040s\"\u003eSwift 40mm Soft Axle - Black Oxide 1040mm x 3.0mm - Universal Karting\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/swift-40mm-hard-axle-axs040h\"\u003eSwift 40mm Hard Axle for Precision and Power Transfer\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/swift-40mm-medium-axle-axs040m\"\u003eSwift 40mm Medium Axle 1040mm for Versatile Kart Handling\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/swift-three-peg-key-for-40mm-axles-ak004\"\u003eSwift AK004 Three-Peg Key for 40mm and 50mm Axles\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/ak003-swift-two-peg-axle-key-ak003\"\u003eSwift AK003 Two-Peg Axle Key - 50mm OTK Axles - All Classes\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Swift","offers":[{"title":"Default Title","offer_id":52566805676350,"sku":"AK004","price":9.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/50mmaxles-ak004-swift-three-peg-axle-key-ak004.jpg?v=1763116666"},{"product_id":"axt050h-50mm-hard-axle-otk-replacement","title":"50mm Hard Axle AXT050H - OTK Chassis Direct Replacement","description":"\u003cp\u003eEquip your go-kart with the robust AXT050H 50mm Hard Axle, engineered as a direct replacement for OTK chassis systems. This precision axle delivers the strength and rigidity needed for demanding track conditions, ensuring smooth power transfer and consistent handling.\u003c\/p\u003e\u003cp\u003eDesigned for versatility, it supports both inboard and outboard applications. For four-cycle engines or other inboard setups, pair it with three AK003 keys and one AK004 key. Outboard configurations require four AK003 keys. Note that all keys are sold separately, allowing you to customize based on your specific build.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e50mm diameter for optimal stiffness\u003c\/li\u003e\n\u003cli\u003eHard construction withstands high-torque racing\u003c\/li\u003e\n\u003cli\u003eSeamless fit as OTK direct replacement\u003c\/li\u003e\n\u003cli\u003eCompatible with four-cycle and inboard\/outboard kart drivetrains\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eWhether you're maintaining a club racer or prepping for regional events, this axle provides the reliability pit crews trust. Its straightforward installation minimizes downtime, getting you back on track faster. Built to endure the rigors of competitive karting, it maintains alignment under load for superior lap times.\u003c\/p\u003e\u003cp\u003eIdeal for builders seeking OTK-compatible components without compromise. Order yours to enhance driveline performance today.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat chassis does this axle fit?\u003c\/strong\u003e\u003cbr\u003eIt's a direct replacement for OTK chassis.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat keys are needed for installation?\u003c\/strong\u003e\u003cbr\u003eUse three AK003 and one AK004 for four-cycle or inboard apps; four AK003 for outboard. Keys sold separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this suitable for four-cycle engines?\u003c\/strong\u003e\u003cbr\u003eYes, specifically mentioned for four-cycle inboard applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat's the diameter?\u003c\/strong\u003e\u003cbr\u003e50mm hard axle.\u003c\/p\u003e","brand":"Swift Karting","offers":[{"title":"Default Title","offer_id":53244075049278,"sku":"AXT050H","price":211.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/AXT050H_50mm_Hard_Axle.jpg?v=1774893773"},{"product_id":"50mm-ultra-soft-axle","title":"50mm Ultra Soft Axle for OTK Chassis","description":"\u003cp\u003eA kart axle is the solid bar that spins your rear wheels and carries the sprocket driven by the chain. This 50mm ultra soft version from SMKart flexes just the right amount under cornering loads so the tires stay planted longer, giving beginners more confidence and experts another tuning tool for quicker lap times.\u003c\/p\u003e\u003cp\u003eMade from high-grade steel in a silver finish, the axle is a direct replacement for OTK chassis. It transfers engine power smoothly while its ultra soft stiffness lets the rear end work with the track instead of fighting it. Four-cycle or inboard brake setups use three AK003 and one AK004 inboard fasteners plus four AK003 outboard; keys are sold separately.\u003c\/p\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStiffness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUltra Soft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInboard Fasteners\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3x AK003 + 1x AK004\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutboard Fasteners\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4x AK003\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKeys\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSold separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003eRacers pick this axle when they want controlled flex to improve grip on technical corners without sacrificing straight-line stability. Whether you are dialing in your first OTK rental kart or chasing tenths in a national series, the SMKart 50mm ultra soft axle delivers predictable handling you can trust.\u003c\/p\u003e\u003cdiv class=\"faq-q\"\u003e\u003cstrong\u003eWill this 50mm ultra soft axle fit my OTK kart chassis?\u003c\/strong\u003e\u003c\/div\u003e\u003cdiv class=\"faq-a\"\u003eYes, it is a direct replacement designed specifically for OTK chassis. Confirm your current axle diameter is 50mm before ordering.\u003c\/div\u003e\u003cdiv class=\"faq-q\"\u003e\u003cstrong\u003eWhat fasteners and keys do I need to install this ultra soft kart axle?\u003c\/strong\u003e\u003c\/div\u003e\u003cdiv class=\"faq-a\"\u003eInboard brake or four-cycle setups require 3x AK003 plus 1x AK004; outboard brake applications use 4x AK003. All keys are sold separately.\u003c\/div\u003e\u003cdiv class=\"faq-q\"\u003e\u003cstrong\u003eDoes this axle come with a warranty?\u003c\/strong\u003e\u003c\/div\u003e\u003cdiv class=\"faq-a\"\u003eYes, it carries the standard SMKart warranty against manufacturing defects. Proper installation and regular inspection for wear are required to maintain coverage.\u003c\/div\u003e\n\n\u003cdiv style=\"margin:28px 0;font-family:inherit;\"\u003e\n  \u003cdetails style=\"border:1px solid #d0e4f0;border-radius:8px;overflow:hidden;\"\u003e\n    \u003csummary style=\"cursor:pointer;padding:12px 18px;background:#eef6fc;font-weight:700;font-size:1.02em;list-style:none;display:flex;align-items:center;gap:10px;\"\u003e\n      \u003cspan style=\"font-size:1.1em;color:#1a6090;\"\u003e▸\u003c\/span\u003e\n      \u003cspan style=\"color:#1a6090;\"\u003eProduct Highlights\u003c\/span\u003e\n    \u003c\/summary\u003e\n    \u003cul style=\"margin:0;padding:10px 18px 14px 18px;list-style:none;background:#fff;\"\u003e\n\u003cli style=\"padding:7px 0;border-bottom:1px solid #eef2f6;display:flex;gap:10px;align-items:flex-start;\"\u003e\n\u003cspan style=\"color:#2a8a4a;font-weight:bold;flex-shrink:0;\"\u003e✓\u003c\/span\u003e\u003cspan\u003eSolid steel bar connects the rear wheels and carries the drive sprocket.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:7px 0;border-bottom:1px solid #eef2f6;display:flex;gap:10px;align-items:flex-start;\"\u003e\n\u003cspan style=\"color:#2a8a4a;font-weight:bold;flex-shrink:0;\"\u003e✓\u003c\/span\u003e\u003cspan\u003e50 mm diameter axle is designed specifically for OTK chassis.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:7px 0;border-bottom:1px solid #eef2f6;display:flex;gap:10px;align-items:flex-start;\"\u003e\n\u003cspan style=\"color:#2a8a4a;font-weight:bold;flex-shrink:0;\"\u003e✓\u003c\/span\u003e\u003cspan\u003eUltra soft stiffness rating allows controlled flex for improved corner grip.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:7px 0;border-bottom:1px solid #eef2f6;display:flex;gap:10px;align-items:flex-start;\"\u003e\n\u003cspan style=\"color:#2a8a4a;font-weight:bold;flex-shrink:0;\"\u003e✓\u003c\/span\u003e\u003cspan\u003eSilver steel finish with machined keyways for sprocket and brake rotor location.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:7px 0;border-bottom:1px solid #eef2f6;display:flex;gap:10px;align-items:flex-start;\"\u003e\n\u003cspan style=\"color:#2a8a4a;font-weight:bold;flex-shrink:0;\"\u003e✓\u003c\/span\u003e\u003cspan\u003eInboard brake or four-cycle setups require three AK003 and one AK004 fasteners.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:7px 0;border-bottom:1px solid #eef2f6;display:flex;gap:10px;align-items:flex-start;\"\u003e\n\u003cspan style=\"color:#2a8a4a;font-weight:bold;flex-shrink:0;\"\u003e✓\u003c\/span\u003e\u003cspan\u003eOutboard brake setups use four AK003 fasteners.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:7px 0;border-bottom:1px solid #eef2f6;display:flex;gap:10px;align-items:flex-start;\"\u003e\n\u003cspan style=\"color:#2a8a4a;font-weight:bold;flex-shrink:0;\"\u003e✓\u003c\/span\u003e\u003cspan\u003eKeys for sprocket and brake mounting are sold separately.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:7px 0;border-bottom:1px solid #eef2f6;display:flex;gap:10px;align-items:flex-start;\"\u003e\n\u003cspan style=\"color:#2a8a4a;font-weight:bold;flex-shrink:0;\"\u003e✓\u003c\/span\u003e\u003cspan\u003eDirect replacement axle for standard OTK kart chassis.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli style=\"padding:7px 0;border-bottom:1px solid #eef2f6;display:flex;gap:10px;align-items:flex-start;\"\u003e\n\u003cspan style=\"color:#2a8a4a;font-weight:bold;flex-shrink:0;\"\u003e✓\u003c\/span\u003e\u003cspan\u003eTransfers engine power to the rear wheels while tuning rear grip.\u003c\/span\u003e\n\u003c\/li\u003e\n    \u003c\/ul\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e","brand":"SMKart","offers":[{"title":"Default Title","offer_id":53415121158462,"sku":"AXT050E","price":199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/files\/smkart-50mm-ultra-soft-axle-angle.jpg?v=1777628727"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0962\/4721\/8494\/collections\/50mmaxles-axt050u-50mm-soft-axle-axt050u.jpg?v=1788978529","url":"https:\/\/swiftkarting.com\/collections\/50mm-kart-rear-axles-and-axle-keys.oembed","provider":"Swift Karting","version":"1.0","type":"link"}