{"product_id":"starrett-54240-o1-tool-steel-flat-stock-1-5x1-5x18-in","title":"Starrett 54240 O1 Tool Steel Flat Stock 1.5x1.5x18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 54240 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Made from AISI Type O1 tool steel, it measures 1-1\/2 inches thick by 1-1\/2 inches wide by 18 inches long and weighs approximately 11.48 pounds. The O1 grade offers excellent machinability in the annealed state and responds well to oil-quench hardening, making it a reliable choice for punches, dies, gauges, and similar tooling components. Thickness tolerance is held to plus or minus 0.001 inches, and edge squareness is maintained at 0.003 inches per inch across all edges.\u003c\/p\u003e\u003cp\u003eThis flat stock is suited for job shops, tool-and-die operations, and maintenance machining environments where close-tolerance blanks are needed without extensive pre-machining. The 18-inch length provides a practical starting blank for a wide range of tooling projects. Machinists and tool-and-die makers typically saw, mill, or grind this stock to final dimensions before hardening. The oil-hardening designation means this grade is quenched in oil rather than water, which reduces the risk of distortion and cracking during heat treatment compared to water-hardening grades.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel for consistent hardenability and dimensional stability after quench\u003c\/li\u003e\n\u003cli\u003eThickness tolerance of plus or minus 0.001 inches for precise blank sizing\u003c\/li\u003e\n\u003cli\u003eWidth tolerance of 0.000 to minus 0.005 inches\u003c\/li\u003e\n\u003cli\u003eLength tolerance of plus 0.250 inches\u003c\/li\u003e\n\u003cli\u003eEdge squareness held to 0.003 inches per inch on all edges\u003c\/li\u003e\n\u003cli\u003eReady-to-machine annealed condition allows standard HSS or carbide tooling\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard AISI Type O1 oil-hardening tool steel flat stock suitable for general toolmaking, die making, and precision fixture fabrication where O1 grade material is specified.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eMachining and heat treatment of tool steel should be performed by qualified machinists or tool-and-die professionals familiar with O1 grade handling. Always follow proper heat treatment procedures per the material specification, including pre-heat, austenitizing, and oil-quench sequences appropriate for O1 steel. Use appropriate personal protective equipment when cutting, grinding, or heat treating this material. Consult applicable shop safety standards and material data sheets before processing.\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: 1-1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 1-1\/2 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: 0.000 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\u003eSquareness\u003c\/strong\u003e: 0.003 inches per inch on all edges\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 11.48 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: 54240\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51541388362034,"sku":"54240","price":477.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_f89b3d6b-ae5d-473a-8146-2d9338bfe506.jpg?v=1785874493","url":"https:\/\/voomisupply.com\/products\/starrett-54240-o1-tool-steel-flat-stock-1-5x1-5x18-in","provider":"Voomi Supply","version":"1.0","type":"link"}