{"product_id":"pto-extender-adaptor-female-21-male-6-1-3-8-spline-for-70hp-engine","title":"PTO Extender Adaptor Female 21 Male 6 1 3 8 Spline for 70HP Engine","description":"\u003cstrong\u003eThis PTO Extender Adaptor is a driveline extension coupler that adapts female 1-3\/8\" 21-spline to male 1-3\/8\" 6-spline PTO connections, made for 70HP-rated engines and standard Category 1 PTO drivelines.\u003c\/strong\u003e\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe PTO Extender Adaptor lengthens the reach of your power take-off shaft while converting spline configurations. It is built for owners of compact tractors, utility vehicles, and stationary engines using 1-3\/8\" PTO drives who need to bridge male 6-spline stubs to female 21-spline implements. This PTO Extender Adaptor ensures a secure, balanced coupling up to 70 horsepower.\u003c\/p\u003e\u003ch3\u003eKey Features \u0026amp; Performance\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAdapts male 1-3\/8\" 6-spline PTO stub to female 1-3\/8\" 21-spline implement shaft\u003c\/li\u003e\n\u003cli\u003eExtends overall PTO driveline length for added clearance and easier hookup\u003c\/li\u003e\n\u003cli\u003eRated for engines up to 70 HP — handles demanding rotary cutter and tiller loads\u003c\/li\u003e\n\u003cli\u003ePrecision-machined splines provide snug, low-vibration power transfer\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel construction with corrosion-resistant finish for long life\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment \u0026amp; Compatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFits standard 1-3\/8\" 6-spline male PTO shafts (common on older tractors)\u003c\/li\u003e\n\u003cli\u003eAccepts 1-3\/8\" 21-spline female implement yokes (many modern attachments)\u003c\/li\u003e\n\u003cli\u003eDesigned for 70HP and under engines used in Category 1 PTO applications\u003c\/li\u003e\n\u003cli\u003eCompatible with tractors, gearboxes, and stationary power units using this spline standard\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCommon Uses\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eExtending PTO length on rotary mowers, finish mowers, and flail mowers\u003c\/li\u003e\n\u003cli\u003eAdapting 6-spline tractor PTO to 21-spline equipment like post hole diggers and tillers\u003c\/li\u003e\n\u003cli\u003eBridging short-coupled drivelines on backhoes, wood chippers, and generators\u003c\/li\u003e\n\u003cli\u003eConnecting stationary 70HP engines to PTO-driven pumps and compressors\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInput Connection:\u003c\/strong\u003e Female, 1-3\/8 inch diameter, 21-spline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput Connection:\u003c\/strong\u003e Male, 1-3\/8 inch diameter, 6-spline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Horsepower:\u003c\/strong\u003e 70 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePTO Series:\u003c\/strong\u003e 1-3\/8 inch standard (Category 1)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Can I use this adaptor to connect a 6-spline tractor to a 21-spline implement?\u003cstrong\u003e A:\u003c\/strong\u003e Yes, the adaptor’s female 21-spline side attaches to the implement yoke and its male 6-spline side slides onto your tractor PTO stub, provided both are 1-3\/8\" diameter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ:\u003c\/strong\u003e Will this work for implements that require a longer shaft?\u003cstrong\u003e A:\u003c\/strong\u003e Absolutely, it extends the driveline by the adaptor’s body length, helping prevent u-joint binding on short shafts while maintaining full 70HP capacity.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eProduct appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.\u003c\/em\u003e\u003c\/p\u003e","brand":"DURAFORCE","offers":[{"title":"Default Title","offer_id":53679675212049,"sku":"ZZ3A00661","price":87.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0250\/2446\/2929\/files\/57_fd703c5d-f5c0-4cd3-87c8-8e6dc397897a.jpg?v=1781652639","url":"https:\/\/www.duraforce.com\/products\/pto-extender-adaptor-female-21-male-6-1-3-8-spline-for-70hp-engine","provider":"DURAFORCE","version":"1.0","type":"link"}