{"product_id":"starrett-54400-o1-tool-steel-flat-stock-5-16x3-1-2x36-in","title":"Starrett 54400 O1 Tool Steel Flat Stock 5\/16x3-1\/2x36 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 54400 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die making, jig fabrication, and precision machining applications. Manufactured to AISI Type O1 specification, this flat stock measures 5\/16 inch thick, 3-1\/2 inches wide, and 36 inches long, and weighs 11.16 pounds. O1 tool steel is a cold-work oil-hardening alloy known for its dimensional stability during heat treatment and its ability to hold a sharp edge after hardening. Thickness tolerance is held to plus or minus 0.001 inch, making this stock suitable for close-tolerance tooling work where pre-ground stock dimensions are critical to layout and machining.\u003c\/p\u003e\u003cp\u003eThis flat stock is used in machine shops, tool and die shops, and precision fabrication environments. Typical applications include blanks for punches, dies, gauges, cutting tools, and fixtures. The 36-inch length provides adequate material for most shop floor cutting operations. Width tolerance runs from 0.000 to minus 0.005 inch, and length tolerance is held to plus 0.015 inch. Edge squareness is maintained at 0.003 inch per inch across all edges. Machinists and toolmakers typically cut this stock to rough size before heat treating and finishing to final dimension.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel for predictable hardening in oil quench\u003c\/li\u003e\n\u003cli\u003eThickness tolerance of plus or minus 0.001 inch for close-tolerance tooling blanks\u003c\/li\u003e\n\u003cli\u003eEdge squareness held to 0.003 inch per inch on all edges\u003c\/li\u003e\n\u003cli\u003e36-inch length supports common shop floor rough-cutting operations\u003c\/li\u003e\n\u003cli\u003eWidth tolerance 0.000 to minus 0.005 inch for consistent stock removal planning\u003c\/li\u003e\n\u003cli\u003eLength tolerance plus 0.015 inch ensures full nominal length is always met\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 toolmaking, die making, gauge fabrication, and fixture construction in machine shop and tool and die environments.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eO1 tool steel flat stock is machined, ground, and heat-treated by qualified toolmakers or machinists. Rough-machine to near-net shape before oil hardening to minimize post-heat-treat distortion. Always use appropriate personal protective equipment and follow shop safety protocols when cutting, grinding, or heat-treating tool steel. Heat treatment parameters should follow AISI O1 guidelines and be performed by personnel experienced with tool steel metallurgy.\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: 5\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 3-1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 36 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 0.015 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: 11.16 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: 54400\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51541736685874,"sku":"54400","price":452.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_39234aaa-5611-4c88-ae63-b96905052e4b.jpg?v=1785883505","url":"https:\/\/voomisupply.com\/products\/starrett-54400-o1-tool-steel-flat-stock-5-16x3-1-2x36-in","provider":"Voomi Supply","version":"1.0","type":"link"}