{"product_id":"starrett-54209-o1-tool-steel-flat-stock-7-8x4x18-in","title":"Starrett 54209 O1 Tool Steel Flat Stock 7\/8x4x18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 54209 is an O1 oil-hardening tool steel flat stock bar used in tool and die making, jig and fixture fabrication, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 7\/8 inch thick, 4 inches wide, and 18 inches long, with a weight of 17.85 pounds. The O1 grade offers good machinability in the annealed state and responds well to oil-quench hardening, making it a common choice for punches, dies, gauges, and cutting tools. Tight dimensional tolerances are held throughout, supporting precision layout and stock removal work.\u003c\/p\u003e\u003cp\u003eThis flat stock is suited for tool rooms, maintenance shops, and production environments where O1 tool steel is specified. Typical applications include blanks for custom cutting tools, die sections, forming blocks, and wear plates. The 7\/8 inch thickness provides substantial cross-section for heavy stock removal or for parts that require through-hardening with minimal distortion. Machinists, tool and die makers, and metalworking tradespeople working to close tolerances will find the controlled dimensions on this bar ready for layout and machining directly from the shelf.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel for good machinability and predictable heat treat response\u003c\/li\u003e\n\u003cli\u003eThickness held to plus or minus 0.001 inches for precise stock allowances\u003c\/li\u003e\n\u003cli\u003eWidth tolerance of minus 0 to minus 0.005 inches ensures the bar fits within nominal width\u003c\/li\u003e\n\u003cli\u003eLength tolerance of plus 0.250 inches provides extra material for squaring ends\u003c\/li\u003e\n\u003cli\u003eEdge squareness held to 0.003 inches per inch across all edges\u003c\/li\u003e\n\u003cli\u003e17.85-pound bar weight suitable for substantial tooling blanks\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard AISI O1 oil-hardening tool steel flat stock suitable for general tool room and precision machining applications requiring this alloy grade.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eCutting, grinding, and machining of tool steel flat stock should be performed by qualified machinists or tool and die makers using appropriate cutting tools rated for tool steel. Always follow proper heat treatment procedures per the applicable material specification when hardening O1 steel, including correct quench media and temperature controls. Use personal protective equipment including eye protection and gloves when sawing or grinding. Ensure workholding is secure and stable before beginning any machining operation.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Tool Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial Specification\u003c\/strong\u003e: AISI Type O1 Oil Hardening\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 7\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness Tolerance\u003c\/strong\u003e: plus or minus 0.001 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth Tolerance\u003c\/strong\u003e: minus 0 to minus 0.005 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Tolerance\u003c\/strong\u003e: plus 0.250 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Squareness\u003c\/strong\u003e: 0.003 inches per inch on all edges\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 17.85 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 31231200\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: STARRETT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 54209\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51540784251186,"sku":"54209","price":623.68,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_2e3faf72-8bd1-4801-9c1f-9f59a9f5577b.jpg?v=1785863928","url":"https:\/\/voomisupply.com\/products\/starrett-54209-o1-tool-steel-flat-stock-7-8x4x18-in","provider":"Voomi Supply","version":"1.0","type":"link"}