{"product_id":"starrett-57004-o1-tool-steel-flat-stock-3-8x2x18-in","title":"Starrett 57004 O1 Tool Steel Flat Stock 3\/8x2x18 in","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 57004 is a precision-ground flat stock bar made from AISI Type O1 oil-hardening tool steel. It measures 3\/8 inch thick, 2 inches wide, and 18 inches long, with tight dimensional tolerances of +0.010 to +0.015 inches on thickness and width, and a length tolerance of +0.250 inches. Edge squareness is held to 0.003 inches per inch across all edges. This stock is used by machinists, toolmakers, and die makers who need a reliable, weldable, and machinable blank that responds predictably to oil-quench hardening. At 3.82 pounds, it is a practical size for benchtop layout and cutting operations.\u003c\/p\u003e\u003cp\u003eO1 tool steel flat stock is a standard choice for fabricating punches, dies, gauges, jigs, fixtures, and general-purpose tooling. The 3\/8-inch thickness makes it suitable for applications requiring moderate cross-section strength before or after hardening. This bar is sized for single-piece use in a machine shop or tool room and arrives ready for layout, machining, and heat treatment. It is appropriate for both production tooling and one-off prototype work where dimensional consistency and material traceability matter.\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 and width held to +0.010 to +0.015 inches tolerance\u003c\/li\u003e\n\u003cli\u003eEdge squareness: 0.003 inches per inch on all edges\u003c\/li\u003e\n\u003cli\u003eLength tolerance of +0.250 inches for single-piece cut stock\u003c\/li\u003e\n\u003cli\u003e3\/8 x 2 x 18 inch dimensions suit a wide range of tooling blanks\u003c\/li\u003e\n\u003cli\u003eShips as a single piece — no minimum quantity beyond one bar\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 general machine shop, toolroom, and die-making applications where AISI Type O1 material specification is required.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eMachining and grinding of O1 tool steel should be performed by qualified machinists using appropriate cutting fluids and tooling rated for hardened or pre-hardened steel. Heat treatment — including austenitizing and oil quenching — should follow the material manufacturer guidelines and be performed by personnel familiar with tool steel processing. Always wear appropriate PPE when cutting, grinding, or heat-treating steel stock. Verify final dimensions after any heat treatment, as some dimensional change is normal during hardening.\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: 2 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: +0.010 to +0.015 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth Tolerance\u003c\/strong\u003e: +0.010 to +0.015 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength Tolerance\u003c\/strong\u003e: +0.250 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEdge Squareness\u003c\/strong\u003e: 0.003 inches per inch, all edges\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3.82 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: 57004\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51544627151154,"sku":"57004","price":162.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/6555d28ffd7e02d6cc316d25961d7428_019a35b7-c9f9-4d29-9314-914419d6c598.jpg?v=1785931965","url":"https:\/\/voomisupply.com\/products\/starrett-57004-o1-tool-steel-flat-stock-3-8x2x18-in","provider":"Voomi Supply","version":"1.0","type":"link"}