{"product_id":"starrett-58898-o1-tool-steel-flat-stock-3-8x5-8x36-in","title":"Starrett 58898 O1 Tool Steel Flat Stock 3\/8x5\/8x36 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 58898 is an O1 oil-hardening tool steel flat stock bar intended for toolmakers, machinists, and die makers who need a precision-ground blank for fabricating punches, dies, gauges, cutting tools, and similar toolroom components. Manufactured to AISI Type O1 specification, this bar measures 3\/8 inches thick by 5\/8 inches wide by 36 inches long and weighs 2.39 pounds. Thickness and squareness tolerances are held to plus or minus 0.001 inches, making it suitable for applications where dimensional accuracy before heat treatment is critical. O1 tool steel offers good machinability in the annealed state and responds well to oil-quench hardening.\u003c\/p\u003e\u003cp\u003eThis flat stock is used in toolroom and machine shop environments for producing short-run tooling, jigs, fixtures, and wear components. Its pre-ground surfaces reduce setup time when milling or grinding to final dimensions. Typical users include toolroom machinists, die makers, and maintenance technicians working in manufacturing facilities, metalworking shops, and industrial maintenance departments. The 36-inch length allows blanks to be cut to multiple shorter pieces as needed for individual tooling projects.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel for predictable heat-treat response\u003c\/li\u003e\n\u003cli\u003eThickness tolerance of plus or minus 0.001 inches for precision fitment before hardening\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 0.015 inches\u003c\/li\u003e\n\u003cli\u003eSquareness held to 0.003 inches per inch on all edges\u003c\/li\u003e\n\u003cli\u003eSingle 36-inch bar per package — ready to cut to length\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a standard AISI O1 oil-hardening tool steel flat bar suitable for general toolroom fabrication wherever O1 grade flat stock at 3\/8 x 5\/8 x 36 inches is specified.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eCutting and machining of this bar should be performed in the annealed state using appropriate metalworking equipment; wear proper PPE including eye protection and cut-resistant gloves when sawing or grinding. Heat treating to final hardness requires controlled furnace equipment and an oil quench — this work is typically performed by a qualified toolroom machinist or heat-treat specialist following the material supplier guidelines for O1 steel. Finished tooling should be inspected for dimensional compliance after hardening and tempering before placing in service.\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: 3\/8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 5\/8 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\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\u003ePackage Quantity\u003c\/strong\u003e: 1\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: 58898\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51538831966514,"sku":"58898","price":128.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_732b9b93-a5c6-4995-b595-145e9d105296.jpg?v=1785827840","url":"https:\/\/voomisupply.com\/products\/starrett-58898-o1-tool-steel-flat-stock-3-8x5-8x36-in","provider":"Voomi Supply","version":"1.0","type":"link"}