{"product_id":"starrett-56980-o1-tool-steel-flat-stock-1-4x3x18-in","title":"Starrett 56980 O1 Tool Steel Flat Stock 1\/4x3x18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 56980 is a precision-ground O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who need a reliable blank for custom tooling, fixtures, gauges, and cutting tools. Measuring 0.25 inches thick, 3 inches wide, and 18 inches long, this bar conforms to AISI Type O1 material specification. Thickness and width tolerances are held to +0.0100 to +0.0150 inches, and edge squareness is maintained at 0.003 inches per inch. O1 tool steel offers good machinability in the annealed state and responds predictably to oil-quench hardening, making it a standard choice for shop-made tooling blanks.\u003c\/p\u003e\u003cp\u003eO1 flat stock in this size is commonly used in toolroom and job-shop environments for fabricating punches, dies, form tools, drill bushings, and precision fixtures. The 18-inch length provides enough stock to yield multiple smaller blanks or one longer tool component without additional splicing. This bar ships in the soft-annealed condition, ready to machine, then heat treat to the required hardness. Typical users include tool and die shops, maintenance machinists, and prototype fabricators who need over-the-counter tool steel without custom mill lead times.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel — predictable hardening response with minimal distortion during oil quench\u003c\/li\u003e\n\u003cli\u003eThickness and width tolerances of +0.0100 to +0.0150 inches for close-tolerance machining starts\u003c\/li\u003e\n\u003cli\u003eEdge squareness held to 0.003 inches per inch on all edges\u003c\/li\u003e\n\u003cli\u003eLength tolerance of +0.2500 inches — full positive allowance, no undersize cuts\u003c\/li\u003e\n\u003cli\u003eAnnealed condition allows conventional milling, drilling, and grinding before hardening\u003c\/li\u003e\n\u003cli\u003eSingle-piece packaging (Pkg Qty 1) with no minimum order beyond one bar\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose O1 tool steel flat stock blank suitable for toolroom, die shop, and maintenance machining applications requiring AISI Type O1 oil-hardening material in a 0.25 x 3 x 18 inch form factor.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eMachining and heat treatment of tool steel should be performed by a qualified machinist or toolmaker familiar with AISI O1 oil-hardening procedures. Secure the bar firmly in a milling vise or on a surface grinder magnetic chuck before stock removal. Heat treatment — including austenitizing temperature, soak time, and oil-quench procedure — should follow the material manufacturer's published guidelines; improper quenching can cause cracking or warping. Allow the bar to reach ambient temperature before layout work to ensure accurate measurement.\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: 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 3 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\u003eSquareness\u003c\/strong\u003e: 0.003 inches per inch on all edges\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3.83 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: 56980\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51538840977714,"sku":"56980","price":240.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_92688695-d18e-42db-9804-68d41dff2497.jpg?v=1785828044","url":"https:\/\/voomisupply.com\/products\/starrett-56980-o1-tool-steel-flat-stock-1-4x3x18-in","provider":"Voomi Supply","version":"1.0","type":"link"}