{"product_id":"crankshaft-sleeve-adapter-5-8-to-3-4-inch-pulley-bore-reducer-bushing","title":"5\/8\" to 3\/4\" Crankshaft Sleeve Adapter Pulley Bore Reducer","description":"\u003ch2\u003eCrankshaft Sleeve Adapter – 5\/8\" to 3\/4\" Pulley Bore Reducer Bushing with Keystock\u003c\/h2\u003e\n\n\u003cp\u003eUpgrade your motor or pulley setup with this precision-made \u003cstrong\u003eCrankshaft Sleeve Adapter\u003c\/strong\u003e. Engineered to adapt a crankshaft from a \u003cstrong\u003e5\/8-inch diameter to a 3\/4-inch diameter\u003c\/strong\u003e, this steel bushing sleeve allows you to fit pulleys with larger bores onto smaller shafts — no machining required. Includes a \u003cstrong\u003e3\/16-inch keystock\u003c\/strong\u003e for secure, torque-resistant fitment.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're swapping pulleys for a different belt configuration, adjusting drive speed ratios, or repurposing motors with mismatched shaft diameters, this compact adapter delivers a reliable, tight fit every time.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConverts 5\/8\" shaft to 3\/4\" bore\u003c\/strong\u003e — instantly compatible with larger-bore pulleys and sheaves\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncludes 3\/16\" keystock\u003c\/strong\u003e — ensures positive, non-slip engagement between shaft and pulley\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSolid steel construction\u003c\/strong\u003e — durable, corrosion-resistant, and built for repeated use\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFits standard sheave and pulley applications\u003c\/strong\u003e — ideal for motors, lawnmowers, compressors, and more\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo machining needed\u003c\/strong\u003e — drop-in fit for fast, straightforward installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInner Diameter (ID):\u003c\/strong\u003e 5\/8 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOuter Diameter (OD):\u003c\/strong\u003e 3\/4 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKeystock Size:\u003c\/strong\u003e 3\/16 inch (included)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Steel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat This Adapter Does\u003c\/h3\u003e\n\u003cp\u003eThis shaft sleeve bushing serves two primary functions:\u003c\/p\u003e\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShaft Adaptation:\u003c\/strong\u003e Allows motors with a 5\/8\" shaft to accept pulleys or sheaves bored for a 3\/4\" shaft.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrive Customization:\u003c\/strong\u003e Makes it easy to swap pulleys for different belt sizes or speed ratios without replacing the motor itself.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSmall engine and motor shaft upgrades\u003c\/li\u003e\n  \u003cli\u003eBelt-driven equipment such as lawnmowers, compressors, and fans\u003c\/li\u003e\n  \u003cli\u003eDIY mechanical and workshop projects\u003c\/li\u003e\n  \u003cli\u003eAgricultural and industrial drive systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on safe tool and hardware use in mechanical applications, visit the OSHA Mechanical Safety Resources.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does the 5\/8\" to 3\/4\" crankshaft sleeve adapter do?\u003c\/h4\u003e\n\u003cp\u003eA: This crankshaft sleeve adapter allows you to fit a pulley or sheave with a 3\/4-inch bore onto a motor or engine shaft that measures 5\/8 inch in diameter. It includes a 3\/16-inch keystock to lock the pulley securely in place and prevent slipping during operation.\u003c\/p\u003e\n\u003ch4\u003eQ: What material is this pulley bore reducer bushing made from?\u003c\/h4\u003e\n\u003cp\u003eA: The bushing is constructed from solid steel, providing excellent strength and durability for both light-duty and demanding mechanical drive applications.\u003c\/p\u003e\n\u003ch4\u003eQ: Is keystock included with this shaft sleeve adapter?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — a 3\/16-inch keystock is included with the adapter, so you have everything you need for a secure, torque-resistant installation right out of the box.\u003c\/p\u003e\n\u003ch4\u003eQ: What types of equipment is this bushing compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This bore reducer bushing is compatible with any belt-driven equipment using standard sheave and pulley assemblies, including lawnmowers, air compressors, fans, small engines, and various workshop machinery where a 5\/8\" shaft and 3\/4\" bore combination is required.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the 5\/8\\\" to 3\/4\\\" crankshaft sleeve adapter do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This crankshaft sleeve adapter allows you to fit a pulley or sheave with a 3\/4-inch bore onto a motor or engine shaft that measures 5\/8 inch in diameter. 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