{"product_id":"starrett-54187-o1-tool-steel-flat-stock-3-4-x-3-4-x-18-in","title":"Starrett 54187 O1 Tool Steel Flat Stock 3\/4 X 3\/4 X 18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 54187 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die work, and precision machining applications. Manufactured to AISI Type O1 specifications, this flat stock measures 0.75 inches thick, 0.75 inches wide, and 18 inches long, with a weight of 2.39 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications that require tight dimensional control before heat treatment. Machinists, tool and die makers, and precision fabricators work with this material when building punches, dies, gauges, and cutting tools that will be oil-quenched to final hardness.\u003c\/p\u003e\u003cp\u003eO1 tool steel flat stock is a standard material in job shops, toolrooms, and maintenance departments where custom tooling is fabricated in-house. This bar is supplied in the annealed condition, ready for machining to final profile before oil-hardening heat treatment. The 18-inch length accommodates a wide range of tooling blanks without requiring additional cutoff from longer bar stock. It is commonly used in both low-volume production tooling and one-off repair or replacement tool situations.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel construction for predictable heat treat response\u003c\/li\u003e\n\u003cli\u003eThickness and squareness tolerance of plus or minus 0.001 inches for precision fitment\u003c\/li\u003e\n\u003cli\u003eWidth tolerance of 0.000 to minus 0.005 inches for consistent stock sizing\u003c\/li\u003e\n\u003cli\u003eLength tolerance of plus 0.250 inches for reliable minimum usable length\u003c\/li\u003e\n\u003cli\u003eEdge squareness held to 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 O1 tool steel flat bar for use in toolrooms and machine shops requiring AISI Type O1 oil-hardening material in 0.75-inch by 0.75-inch cross-section stock.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eO1 tool steel flat stock is worked by machinists and tool and die makers using conventional milling, grinding, and turning equipment. Machine to final dimensions in the annealed state before heat treatment. Oil-hardening heat treatment should be performed by qualified personnel following established metallurgical guidelines for AISI O1 steel. Consult applicable shop safety standards when handling cutting fluids and quench oils during the hardening process.\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: 0.75 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 0.75 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: Edge: All 0.003 inches per inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 2.39 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: 54187\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51540926300466,"sku":"54187","price":189.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_c9036526-b3cd-4fdd-847f-d4274f0b243d.jpg?v=1785865998","url":"https:\/\/voomisupply.com\/products\/starrett-54187-o1-tool-steel-flat-stock-3-4-x-3-4-x-18-in","provider":"Voomi Supply","version":"1.0","type":"link"}