{"product_id":"starrett-54079-o1-tool-steel-flat-stock-0-25x3-5x18-in","title":"Starrett 54079 O1 Tool Steel Flat Stock 0.25x3.5x18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 54079 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 0.25 inches thick, 3.5 inches wide, and 18 inches long. Thickness tolerance is held to +\/- 0.001 inches, making it suitable for applications where dimensional accuracy is critical before hardening. At 4.48 pounds per piece, this is a solid, single-length bar intended for cutting to final dimensions by machinists, tool and die makers, and metalworking professionals.\u003c\/p\u003e\u003cp\u003eO1 tool steel is widely used in cold-work tooling, blanking dies, punches, gauges, and cutting tools. This flat stock is appropriate for both job shop and production toolmaking environments. It ships in the annealed condition, ready for rough machining prior to oil-quench hardening and tempering. The 18-inch length accommodates a range of part layouts without excessive waste. Edge squareness is held to 0.003 inches per inch across all edges, supporting accurate layout and setup directly from stock.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel — consistent composition for predictable heat treat response\u003c\/li\u003e\n\u003cli\u003eThickness tolerance of +\/- 0.001 inches for precise pre-grind stock allowance planning\u003c\/li\u003e\n\u003cli\u003eWidth tolerance of 0.000 to -0.005 inches — stock runs at or slightly under nominal width\u003c\/li\u003e\n\u003cli\u003eLength tolerance of +0.250 inches — full usable length guaranteed with positive overrun\u003c\/li\u003e\n\u003cli\u003eEdge squareness held to 0.003 inches per inch on all edges\u003c\/li\u003e\n\u003cli\u003eSupplied in annealed condition for machinability prior to hardening\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose O1 tool steel flat stock suitable for toolmaking, die making, and precision machining applications requiring oil-hardening material in 0.25 inch by 3.5 inch cross-section.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eCutting, grinding, and machining of tool steel should be performed by qualified machinists or tool and die makers using appropriate coolant to prevent work hardening at cut edges. Heat treatment — including oil quenching and tempering — should follow AISI O1 specifications and be performed by personnel familiar with tool steel heat treat procedures. Always use proper personal protective equipment when handling and cutting metal stock. Secure workpieces firmly before 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: 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 3.5 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: +\/- 0.001 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth Tolerance\u003c\/strong\u003e: 0.000 to -0.005 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Tolerance\u003c\/strong\u003e: +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: 4.48 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: 54079\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51541480702258,"sku":"54079","price":213.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_3d5b840f-813f-458a-b29e-be11d653c087.jpg?v=1785877351","url":"https:\/\/voomisupply.com\/products\/starrett-54079-o1-tool-steel-flat-stock-0-25x3-5x18-in","provider":"Voomi Supply","version":"1.0","type":"link"}