{"product_id":"starrett-54173-o1-tool-steel-flat-stock-5-8x3-4x18-in","title":"Starrett 54173 O1 Tool Steel Flat Stock 5\/8x3\/4x18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 54173 is an O1 oil-hardening tool steel flat stock bar sized at 5\/8 inches thick, 3\/4 inches wide, and 18 inches long. Manufactured to AISI Type O1 specification, this flat stock is a general-purpose tool steel used for dies, punches, gauges, and cutting tools where moderate wear resistance and good machinability are required. Thickness tolerance is held to plus or minus 0.001 inches, and squareness along all edges is controlled to 0.003 inches per inch. At 2.39 pounds, it ships as a single piece ready for bench work or heat-treat processing. Machinists, toolmakers, and die makers are the primary users of this material.\u003c\/p\u003e\u003cp\u003eO1 tool steel flat stock in this size range is suited for light to medium tooling applications in job shops, maintenance departments, and prototype fabrication environments. The 18-inch length provides workable stock for most standard punch and die sets, fixtures, and gauge blanks. Because O1 is oil-quenching steel, it offers lower distortion during heat treatment compared to water-hardening grades, making it a practical choice when dimensional stability after hardening matters.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel for lower distortion during quench\u003c\/li\u003e\n\u003cli\u003eThickness held to plus or minus 0.001 inches for consistent material removal\u003c\/li\u003e\n\u003cli\u003eEdge squareness controlled to 0.003 inches per inch on all edges\u003c\/li\u003e\n\u003cli\u003eWidth tolerance of 0.000 to minus 0.005 inches for close-fit applications\u003c\/li\u003e\n\u003cli\u003eLength tolerance of plus 0.250 inches ensures full usable length\u003c\/li\u003e\n\u003cli\u003eSingle-piece quantity suitable for one-off tooling and repair work\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard O1 oil-hardening tool steel flat bar for use in toolmaking, die making, and precision machining applications requiring AISI Type O1 material specification.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eTool steel flat stock is worked by machinists and toolmakers using standard milling, grinding, and sawing equipment. When heat treating, follow the quenching procedure appropriate for O1 oil-hardening steel and use proper personal protective equipment during the quench process. Inspect dimensional tolerances before and after heat treatment, as hardening may introduce minor distortion. Secure workpieces firmly before machining to maintain the tight tolerances specified for this stock.\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\/8 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: 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: 54173\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51543042523442,"sku":"54173","price":162.93,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_6e286ad0-9b52-4fbf-bc44-8611c963fbb3.jpg?v=1785914355","url":"https:\/\/voomisupply.com\/products\/starrett-54173-o1-tool-steel-flat-stock-5-8x3-4x18-in","provider":"Voomi Supply","version":"1.0","type":"link"}