{"product_id":"starrett-57033-o1-tool-steel-flat-stock-5-8x1-1-4x18-in","title":"Starrett 57033 O1 Tool Steel Flat Stock 5\/8x1-1\/4x18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 57033 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 0.625 inches thick, 1.25 inches wide, and 18 inches long. Thickness and width tolerances run +0.0100 to +0.0150 inches, and length tolerance is +0.2500 inches. Edge squareness is held to 0.003 inches per inch across all edges. At 3.99 pounds, this bar is sized for bench-scale tool and fixture work. Machinists, tool and die makers, and industrial maintenance technicians are the primary users of this material.\u003c\/p\u003e\u003cp\u003eO1 tool steel flat stock is used when a readily machinable steel is needed that can be oil-hardened to high hardness after rough machining. Typical applications include punches, dies, gauges, bushings, fixture components, and small cutting tools. The 18-inch length suits common bench and mill operations without requiring additional cut-down before use. This stock is suited for shop environments where close-tolerance ground stock simplifies final fitting and layout work.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel for reliable heat-treat response\u003c\/li\u003e\n\u003cli\u003eThickness: 0.625 inches with +0.0100 to +0.0150 inch tolerance\u003c\/li\u003e\n\u003cli\u003eWidth: 1.25 inches with +0.0100 to +0.0150 inch tolerance\u003c\/li\u003e\n\u003cli\u003eLength: 18 inches with +0.2500 inch tolerance\u003c\/li\u003e\n\u003cli\u003eEdge squareness held to 0.003 inches per inch on all edges\u003c\/li\u003e\n\u003cli\u003eReady for layout, machining, and subsequent oil-hardening heat treatment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard O1 oil-hardening tool steel flat stock bar suitable for general toolmaking, die making, and precision fixture fabrication where AISI Type O1 material is specified.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eMachining and heat treatment of tool steel flat stock is typically performed by machinists or tool and die makers using conventional milling, grinding, and turning equipment. Always rough machine to near-final dimensions before oil-hardening heat treatment, as post-hardening grinding is required to reach final tolerances. Follow the material supplier heat-treat guidelines for O1 steel; improper quench technique can cause warping or cracking. Wear appropriate PPE when machining or handling heat-treated steel.\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: 0.625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 1.25 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: +0.0100 to +0.0150 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth Tolerance\u003c\/strong\u003e: +0.0100 to +0.0150 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Tolerance\u003c\/strong\u003e: +0.2500 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Squareness\u003c\/strong\u003e: 0.003 inches per inch, all edges\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3.99 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: 57033\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51540842676530,"sku":"57033","price":178.52,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_781e34ff-d6cd-407b-94f6-aec5627d0a00.jpg?v=1785864762","url":"https:\/\/voomisupply.com\/products\/starrett-57033-o1-tool-steel-flat-stock-5-8x1-1-4x18-in","provider":"Voomi Supply","version":"1.0","type":"link"}