{"product_id":"browning-1128297-finished-bore-sprocket-18t-1-2in-pitch","title":"Browning 1128297 Finished Bore Sprocket 18T 1\/2in Pitch","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe BROWNING 1128297 is a finished bore roller chain sprocket designed for use with No. 40 roller chain in power transmission applications. Machined from steel, this sprocket features 18 teeth, a 1\/2 inch chain pitch, and a finished bore diameter of 3\/4 inch. The outside diameter measures 3.14 inches and the hub diameter is 2.391 inches. It ships ready to mount to a shaft without additional machining, making it a straightforward replacement or new-install component for conveyor drives, HVAC equipment drives, pump drives, and similar light-to-medium duty mechanical systems. The part weighs 1.14 pounds.\u003c\/p\u003e\n\u003cp\u003eThis sprocket is suited for residential and commercial mechanical systems where No. 40 roller chain drives are used. Common applications include blower and fan drives, pump drive assemblies, conveyor systems, and other equipment requiring a compact, finished bore sprocket. Because the bore is already finish-machined to 3\/4 inch, installation is direct onto a matching shaft without additional lathe work. HVAC technicians, millwrights, and mechanical contractors encounter this type of sprocket in equipment room and rooftop unit drive train assemblies.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eFinished bore eliminates additional machining — installs directly onto a 3\/4 inch shaft\u003c\/li\u003e\n  \u003cli\u003e18-tooth configuration for No. 40 roller chain with 1\/2 inch pitch\u003c\/li\u003e\n  \u003cli\u003eSteel construction for durability in mechanical drive applications\u003c\/li\u003e\n  \u003cli\u003e3.14 inch outside diameter and 2.391 inch hub diameter\u003c\/li\u003e\n  \u003cli\u003eLightweight at 1.14 pounds for easier handling during installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-install finished bore sprocket for mechanical drive assemblies using No. 40 roller chain with 1\/2 inch pitch and a 3\/4 inch drive shaft.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is typically performed by a licensed mechanic, millwright, or qualified HVAC technician. De-energize and lock out the drive system before removing or installing any sprocket. Verify shaft diameter matches the 3\/4 inch finished bore before mounting, and confirm proper chain alignment and tension after installation per the equipment manufacturer guidelines. Consult applicable ANSI and OSHA standards for mechanical drive safety requirements.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Teeth\u003c\/strong\u003e: 18\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChain Pitch\u003c\/strong\u003e: 1\/2 inch (0.5000 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChain Trade Size\u003c\/strong\u003e: 40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBore Diameter\u003c\/strong\u003e: 3\/4 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutside Diameter\u003c\/strong\u003e: 3.14 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHub Diameter\u003c\/strong\u003e: 2.391 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.14 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSprocket Type\u003c\/strong\u003e: Finished Bore\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: BROWNING\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 1128297\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BROWNING","offers":[{"title":"Default Title","offer_id":51541400912178,"sku":"1128297","price":73.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/b96840038bc5d253a12390ae34087a6c.jpg?v=1785874899","url":"https:\/\/voomisupply.com\/products\/browning-1128297-finished-bore-sprocket-18t-1-2in-pitch","provider":"Voomi Supply","version":"1.0","type":"link"}