{"product_id":"starrett-54158-o1-tool-steel-flat-stock-0-5x4-5x18-in","title":"Starrett 54158 O1 Tool Steel Flat Stock 0.5x4.5x18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 54158 is an O1 oil-hardening tool steel flat stock bar used in toolmaking, die-making, and precision machining applications. Manufactured to AISI Type O1 material specification, this flat stock measures 0.5 inches thick, 4.5 inches wide, and 18 inches long, with a weight of 11.48 pounds. Thickness tolerance is held to plus or minus 0.001 inches, making this stock suitable for applications where dimensional consistency is critical before and after heat treatment. It is typically purchased by toolmakers, machinists, and die makers who need reliable, machinable stock that responds predictably to oil-quench hardening.\u003c\/p\u003e\u003cp\u003eO1 tool steel flat stock is a standard material for fabricating punches, dies, gauges, jigs, fixtures, and cutting tools in both job shops and production machine shops. This piece is suited to low-to-medium production tooling where good wear resistance and ease of machining in the annealed state are required. The 18-inch length provides enough material for a range of tooling blanks or can be cut down to specific component lengths. Industrial supply houses, tooling distributors, and machine shops stock this grade for on-demand toolmaking work.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eAISI Type O1 oil-hardening tool steel for consistent heat-treat response\u003c\/li\u003e\n\u003cli\u003eThickness tolerance of plus or minus 0.001 inches for dimensional precision\u003c\/li\u003e\n\u003cli\u003eWidth tolerance of 0.000 to minus 0.005 inches\u003c\/li\u003e\n\u003cli\u003eLength tolerance of plus 0.250 inches\u003c\/li\u003e\n\u003cli\u003eEdge squareness held to 0.003 inches per inch across all edges\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 standard O1 oil-hardening tool steel flat stock blank suitable for general toolmaking, die-making, and precision fixture fabrication where AISI Type O1 material specification is required.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eCutting and grinding of tool steel flat stock should be performed by a qualified machinist using appropriate coolant to prevent localized overheating of the material. Heat treatment, including oil quenching and tempering, should follow established procedures for AISI O1 tool steel and should be performed by qualified personnel familiar with tool steel metallurgy. Secure workholding and proper personal protective equipment are required during all cutting, grinding, and handling operations. Edges are sharp as-supplied and should be handled accordingly.\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: 0.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth\u003c\/strong\u003e: 4.5 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: 11.48 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: 54158\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51542176923954,"sku":"54158","price":432.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_c122a4ac-4a29-40b6-9a34-78f4136a980c.jpg?v=1785894247","url":"https:\/\/voomisupply.com\/products\/starrett-54158-o1-tool-steel-flat-stock-0-5x4-5x18-in","provider":"Voomi Supply","version":"1.0","type":"link"}