{"product_id":"sumitomo-u101172-screw-machine-drill-bit-0-4531in-carbide","title":"Sumitomo U101172 Screw Machine Drill Bit 0.4531in Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SUMITOMO U101172 is a screw machine length drill bit engineered for precision drilling in ferrous materials. Built from solid carbide with a coated finish, this bit delivers consistent performance in demanding production environments. It features a 135-degree split point for reduced walking and self-centering entry without a pilot hole. The straight-cylindrical shank seats securely in standard drill chucks and tool holders. At 0.4531 inches (29\/64 inch) in diameter, it covers a wide range of close-tolerance hole applications. Machinists, tool and die technicians, and CNC operators are the primary users of this bit in shop and production settings.\u003c\/p\u003e\n\u003cp\u003eThis bit is designed for drilling cast iron and steel in screw machine, turret lathe, and CNC drilling applications. The screw machine length profile — shorter than jobber length — provides added rigidity and reduced deflection when drilling in these materials. With a flute-to-diameter ratio of 2xD and a tapered web configuration, it handles moderate depths efficiently. The maximum drilling depth is 1.1707 inches, making it well suited to through-hole and shallow blind-hole work in production runs requiring consistent hole geometry and finish quality.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction for hardness and wear resistance in ferrous materials\u003c\/li\u003e\n  \u003cli\u003e135-degree drill point angle for self-centering entry and reduced thrust force\u003c\/li\u003e\n  \u003cli\u003eCoated finish extends tool life and improves chip evacuation\u003c\/li\u003e\n  \u003cli\u003eScrew machine length design increases rigidity and reduces deflection vs. jobber length\u003c\/li\u003e\n  \u003cli\u003eTapered web configuration supports strength at the cutting edge\u003c\/li\u003e\n  \u003cli\u003eStraight-cylindrical shank fits standard drill chucks and tool holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use in cast iron and steel workpieces. Fits standard straight-shank drill chucks and tool holders accepting a 0.4531-inch shank. Part of the Sumitomo MDW-GS series drill bit family.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation and use should be performed by qualified machinists or CNC operators familiar with carbide tooling. Ensure the tool holder or chuck is clean and properly torqued before operation to prevent runout. Carbide is brittle — avoid side loading, interrupted cuts beyond the tool rating, or dropping the bit on hard surfaces. Follow machine manufacturer guidelines for spindle speed and feed rate recommendations appropriate to the workpiece material and hole depth.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 0.4531 inches (29\/64 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.9370 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.8504 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 2.0866 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 1.1707 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Point Length\u003c\/strong\u003e: 0.0938 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 2xD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Coated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Cast Iron, Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter Tolerance\u003c\/strong\u003e: h8\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: MDW-GS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Length Type\u003c\/strong\u003e: Screw Machine\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.25 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: SUMITOMO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: U101172\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SUMITOMO","offers":[{"title":"Default Title","offer_id":51749525717298,"sku":"U101172","price":252.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f5948c33debd081497d2210bce18456e.jpg?v=1788907210","url":"https:\/\/voomisupply.com\/products\/sumitomo-u101172-screw-machine-drill-bit-0-4531in-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}