{"product_id":"starrett-53979-o1-tool-steel-flat-stock-3-32x3-4x18-in","title":"Starrett 53979 O1 Tool Steel Flat Stock 3\/32x3\/4x18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 53979 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 3\/32 inches thick, 3\/4 inches wide, and 18 inches long, with a thickness tolerance of plus or minus 0.001 inches. O1 tool steel is valued for its consistent hardening response in oil-quench heat treatment and its ability to hold a sharp, durable edge after hardening. This bar is supplied in the annealed condition, ready for machining and subsequent heat treatment by tool and die makers, machinists, and metalworking professionals.\u003c\/p\u003e\u003cp\u003eThis flat stock is suited for fabricating punches, dies, cutting tools, gauges, and other precision tooling components. The 18-inch length provides workable stock for a range of tool blanks and shop-made fixtures. The close thickness tolerance of plus or minus 0.001 inches reduces the amount of finish grinding required before use, making it a practical choice for both production toolmaking and one-off tool fabrication in machine shops and tool rooms.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel for reliable, repeatable heat treatment response\u003c\/li\u003e\n\u003cli\u003eThickness tolerance of plus or minus 0.001 inches for precision stock removal planning\u003c\/li\u003e\n\u003cli\u003eWidth tolerance of 0.000 to minus 0.005 inches for consistent width control\u003c\/li\u003e\n\u003cli\u003eLength tolerance of plus 0.250 inches ensures full usable length\u003c\/li\u003e\n\u003cli\u003eEdge squareness of 0.003 inches per inch across all edges\u003c\/li\u003e\n\u003cli\u003eSupplied in annealed condition, ready for machining prior to hardening\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolmaking, die making, and precision machining applications requiring close-tolerance flat stock.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eMachining and heat treatment of O1 tool steel should be performed by qualified machinists or tool and die makers familiar with tool steel handling procedures. Always use appropriate cutting fluids during machining to preserve edge life and dimensional accuracy. Heat treatment, including hardening and tempering, must follow established thermal cycling procedures for O1 tool steel and should be performed with calibrated equipment. Handle annealed stock carefully to avoid surface nicks or burrs that may affect finished tool dimensions.\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: 3\/32 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 3\/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: 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: 0.36 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\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: 53979\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51539175178546,"sku":"53979","price":40.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_a234b182-ad7b-42d0-8953-76809493cd51.jpg?v=1785835952","url":"https:\/\/voomisupply.com\/products\/starrett-53979-o1-tool-steel-flat-stock-3-32x3-4x18-in","provider":"Voomi Supply","version":"1.0","type":"link"}