{"product_id":"starrett-57490-a2-tool-steel-flat-stock-1-16x3-4x18-in","title":"Starrett 57490 A2 Tool Steel Flat Stock 1\/16x3\/4x18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 57490 is an A2 air-hardening tool steel flat stock bar used in toolmaking, die work, fixture building, and precision machining applications. Measuring 0.0625 inches thick, 0.75 inches wide, and 18 inches long, this flat stock ships in a ready-to-machine condition and holds tight dimensional tolerances throughout. The A2 grade designation indicates an air-hardening medium-alloy tool steel that offers good dimensional stability during heat treatment, making it a standard choice for blanking dies, punches, form tools, and similar components that require predictable hardening response. Machinists and tool-and-die makers rely on this material when they need consistent stock thickness and reliable alloy performance.\u003c\/p\u003e\u003cp\u003eThis flat stock is suited for job shop, maintenance, and production toolroom environments. It is appropriate for fabricating cutting tools, gauges, jigs, and fixture components in both prototype and short-run production settings. The 18-inch length provides enough material for most standard toolmaking cuts without excessive waste. The stock ships in the annealed condition, making it ready for milling, grinding, or EDM operations prior to heat treatment.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eA2 air-hardening tool steel for predictable, low-distortion heat treatment\u003c\/li\u003e\n\u003cli\u003eThickness tolerance of plus or minus 0.001 inches for consistent stock removal planning\u003c\/li\u003e\n\u003cli\u003eWidth tolerance of plus 0.000 to 0.005 inches\u003c\/li\u003e\n\u003cli\u003eLength tolerance of plus 0.250 inches\u003c\/li\u003e\n\u003cli\u003eSquare tolerance of plus or minus 0.001 inches\u003c\/li\u003e\n\u003cli\u003eAnnealed condition allows machining before hardening\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a general-purpose A2 tool steel flat stock suitable for toolmaking, die making, and precision fixture applications where air-hardening alloy steel is specified.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eCutting and machining of tool steel flat stock should be performed by qualified machinists or tool-and-die makers using appropriate cutting fluids and tooling rated for alloy steels. Heat treatment to harden A2 steel requires controlled atmosphere or vacuum furnace equipment and should be performed according to the alloy manufacturer's published heat-treat specifications. Always allow stock to reach a safe handling temperature before measuring or further machining after any thermal operation. Follow applicable shop safety standards for handling and storing tool steel stock.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: Tool Steel, AISI A2 Air-Hardening\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness\u003c\/strong\u003e: 0.0625 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: plus 0.000 to 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\u003eSquare Tolerance\u003c\/strong\u003e: plus or minus 0.001 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.24 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: 57490\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51540548485426,"sku":"57490","price":68.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/dd4885fbdd426ecb0fa6c3cc24fba2db_41406ea3-4339-4eb6-9e10-9e00af428427.jpg?v=1785858190","url":"https:\/\/voomisupply.com\/products\/starrett-57490-a2-tool-steel-flat-stock-1-16x3-4x18-in","provider":"Voomi Supply","version":"1.0","type":"link"}