{"product_id":"3mirrors-engine-shaft-sleeve-adapter-1-000-to-1-125-stainless-ss304-1-5-extension-1-4-key","title":"3mirrors Engine Shaft Sleeve Adapter 1.000\" to 1.125\" Stainless SS304 — 1.5\" Extension, 1\/4\" Key","description":"\u003cp\u003e\u003cstrong\u003e3mirrors Engine Pulley Crank Shaft Sleeve Adapter converts a 1.000\" crankshaft to 1.125\" and extends the shaft 1.5\" to accept larger pulleys or gearboxes.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen you need to fit a larger pulley, gearbox input, or transfer case to an existing gas engine crank without replacing the motor, this stainless-steel sleeve adapter provides a simple, robust solution. CNC-machined from SS304 for corrosion resistance and precision fit, the adapter set includes grade 12.9 fasteners and a washer so you can install it on most 1\" crankshafts using the 1\/4\" keyway.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this adapter change pulley size or gear ratio?\u003c\/h3\u003e\n\u003cp\u003eBy increasing the crankshaft diameter from 1.000\" to 1.125\", the adapter lets you mount pulleys and gears designed for the larger diameter. That change alters pulley circumference and belt path, enabling different speeds or mechanical advantages without swapping the engine.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConverts 1.000\" shaft to 1.125\" shaft diameter\u003c\/li\u003e\n  \u003cli\u003eExtends shaft length by 1.5\" for clearance or multi-pulley setups\u003c\/li\u003e\n  \u003cli\u003eUses existing 1\/4\" keyway to transmit torque reliably\u003c\/li\u003e\n  \u003cli\u003eSaves cost versus buying a new motor or special pulley\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this fit my gas engine crankshaft and pulley setup?\u003c\/h3\u003e\n\u003cp\u003eThe sleeve is made for standard 1.000\" engine cranks with a 1\/4\" keyway. It is intended for common small gas engines where pulleys or gearbox inputs expect a 1.125\" shaft. Check your crank diameter and key size before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIntended for 1\" crankshafts with 1\/4\" keyway\u003c\/li\u003e\n  \u003cli\u003eIdeal where pulley or gearbox bores are 1.125\"\u003c\/li\u003e\n  \u003cli\u003eIncludes two high-strength bolts (3\/8-24 and 7\/16-20) plus washer\u003c\/li\u003e\n  \u003cli\u003eVerify bolt engagement depth and key clearance on your engine\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes SS304 and CNC machining important for this adapter?\u003c\/h3\u003e\n\u003cp\u003eSS304 stainless steel offers corrosion resistance and strength for outdoor and workshop environments; CNC machining ensures concentricity and tight tolerances for smooth pulley runout. Those qualities reduce belt wear and vibration compared with rough or plated alternatives.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSS304 resists rust and holds finish over time\u003c\/li\u003e\n  \u003cli\u003eCNC machining achieves precise inner and outer diameters\u003c\/li\u003e\n  \u003cli\u003eAccurate fit reduces eccentricity and vibration on rotating parts\u003c\/li\u003e\n  \u003cli\u003eRecommended for applications where alignment and longevity matter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow is the adapter secured and what hardware is included?\u003c\/h3\u003e\n\u003cp\u003eThe adapter set ships with two high-grade fasteners and a washer so you can clamp it to the crank and retain pulleys safely. Both bolts are 12.9 grade for high tensile strength; use appropriate thread engagement and torque settings for your engine.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eComes with one 3\/8-24 bolt and one 7\/16-20 bolt\u003c\/li\u003e\n  \u003cli\u003eIncludes a washer sized for the smaller bolt to ensure even seating\u003c\/li\u003e\n  \u003cli\u003e12.9-grade hardware provides high clamping reliability\u003c\/li\u003e\n  \u003cli\u003eFollow engine manufacturer torque specs to avoid over-tightening\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: this 3mirrors shaft sleeve adapter is built for mechanics, hobbyists, and small-engine technicians who want to adapt existing gas engines to larger pulleys or gearboxes without replacing the motor. It suits lawn, garden, and light industrial applications where a precise, rust-resistant shaft increase and modest extension are required. If you need to change pulley diameter, add clearance for accessories, or maintain existing belt-driven systems while upgrading driven components, this adapter provides a cost-effective, durable option.\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: Can this sleeve fit any 1\" crankshaft?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It fits standard 1.000\" cranks with a 1\/4\" keyway; verify your crank and key dimensions before purchase.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the kit include bolts and hardware?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — one 3\/8-24 bolt, one 7\/16-20 bolt, and a washer are included; all hardware is grade 12.9.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"3mirrors","offers":[{"title":"Default Title","offer_id":56833159463252,"sku":"B08NWSBNFG","price":46.92,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/3mirrors-front-view-adapter.jpg?v=1787038379","url":"https:\/\/gardenluxe.co.uk\/products\/3mirrors-engine-shaft-sleeve-adapter-1-000-to-1-125-stainless-ss304-1-5-extension-1-4-key","provider":"Gardenluxe Uk","version":"1.0","type":"link"}