{"product_id":"precision-brand-56504-mill-stock-key-stock-5-16x5-16x12-in","title":"Precision Brand 56504 Mill Stock Key Stock 5\/16x5\/16x12 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe PRECISION BRAND 56504 is a mill stock key stock bar cut to 0.3125 x 0.3125 x 12 inches, manufactured from low-carbon steel to ASTM A108 specifications. Each piece carries a Rockwell B80-90 hardness rating, making it suitable for standard power-transmission keyway applications. The plain finish is ready for installation as-received or can be cut to length on-site. This package includes six pieces, providing enough stock for multiple jobs or a single multi-key assembly. Machinists, millwrights, and maintenance technicians are the typical installers.\u003c\/p\u003e\n\u003cp\u003eMill stock key stock in this 5\/16-inch square profile is commonly used in light to medium industrial drive assemblies, including motors, gearboxes, pumps, fans, and conveyor shafts. The square cross-section mates with standard 5\/16-inch keyways on both the shaft and the hub, transmitting torque between rotating components. It is used across residential HVAC equipment, commercial pump sets, and general industrial machinery wherever a removable, replaceable torque-transfer connection is required.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLow-carbon steel construction to ASTM A108 for consistent mechanical properties\u003c\/li\u003e\n  \u003cli\u003eRockwell B80-90 hardness for reliable torque transmission in standard keyway applications\u003c\/li\u003e\n  \u003cli\u003e5\/16 x 5\/16 x 12-inch square mill stock profile fits standard keyways without additional machining in most cases\u003c\/li\u003e\n  \u003cli\u003ePlain finish — ready to cut, file, or install as-received\u003c\/li\u003e\n  \u003cli\u003eSix pieces per package, minimizing trips to supply for multi-key jobs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or service stock for any shaft and hub assembly with a standard 5\/16-inch square keyway, consistent with ASTM A108 low-carbon steel key stock specifications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eKey stock installation is typically performed by a millwright, maintenance technician, or experienced mechanic. Always de-energize and lock out the drive equipment per OSHA lockout\/tagout procedures before removing or installing key stock. Cut the stock to the required length using a cold saw, angle grinder with cutoff wheel, or bandsaw, and deburr all cut edges before fitting. Do not force an oversized key into a keyway, as this can damage the shaft or hub bore.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKey Stock Type\u003c\/strong\u003e: Mill Stock\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Low-Carbon Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Specification\u003c\/strong\u003e: ASTM A108\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 0.3125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeight\u003c\/strong\u003e: 0.3125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.3125 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 12 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish\u003c\/strong\u003e: Plain\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHardness\u003c\/strong\u003e: Rockwell B80-90\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Pieces\u003c\/strong\u003e: 6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1.99 pounds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31163208\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: PRECISION BRAND\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 56504\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"PRECISION BRAND","offers":[{"title":"Default Title","offer_id":51540043071794,"sku":"56504","price":38.78,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/c563927ad3d631985929c02dd95012fb_ef55b376-0439-402b-8507-135671439798.jpg?v=1785845829","url":"https:\/\/voomisupply.com\/products\/precision-brand-56504-mill-stock-key-stock-5-16x5-16x12-in","provider":"Voomi Supply","version":"1.0","type":"link"}