{"product_id":"sumitomo-u101091-screw-machine-drill-bit-0-277in-carbide","title":"Sumitomo U101091 Screw Machine Drill Bit 0.277in Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe SUMITOMO U101091 is a solid carbide screw machine length drill bit designed for precision drilling in demanding production environments. Measuring 0.277 inches (Letter size J) in diameter with a 135-degree split-point geometry, it delivers fast, accurate hole entry with minimal walking. The overall length is 2.874 inches, making it compact and rigid for high-speed drilling applications. With a 2-flute straight-cylindrical shank and tapered web configuration, this bit is built to handle cast iron and steel workpieces. It is part of the MDW-GS series and carries an h8 diameter tolerance for tight dimensional control in close-tolerance work.\u003c\/p\u003e\u003cp\u003eThe U101091 is suited for production machining, job shop drilling, and CNC applications requiring short, rigid tooling. Screw machine length bits like this one are commonly used in turret lathes, screw machines, and machining centers where minimal overhang and high rigidity reduce deflection. Primary workpiece materials include cast iron and steel, making it a practical choice for general metalworking and precision component manufacturing. The flute-to-diameter ratio is 2xD, supporting chip evacuation in shallow to moderate-depth holes without coolant-through features.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\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 reduces entry thrust and minimizes workpiece deformation\u003c\/li\u003e\n\u003cli\u003eTapered web design improves self-centering and reduces chisel edge contact\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank for standard collet and chuck compatibility\u003c\/li\u003e\n\u003cli\u003eh8 diameter tolerance ensures consistent fit in precision toolholders\u003c\/li\u003e\n\u003cli\u003e2-flute geometry promotes efficient chip evacuation in cast iron and steel\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style screw machine length drill bit for use in standard straight-shank collets, drill chucks, and toolholders compatible with 0.277-inch diameter shanks across CNC machining centers, turret lathes, and screw machines.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis drill bit is installed by machinists and CNC tooling technicians using standard collet chucks or drill chucks rated for the shank diameter. Ensure the machine spindle is fully stopped and locked before changing tooling. Confirm runout and tool projection meet the requirements of the workpiece drawing before beginning a production run. Coolant-through is not supported on this bit; verify that external coolant or cutting fluid delivery is adequate for the workpiece material and cutting parameters.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: J\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 0.277 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter Tolerance\u003c\/strong\u003e: h8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2.874 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.299 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1.575 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 0.884 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Length\u003c\/strong\u003e: 0.057 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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Length Type\u003c\/strong\u003e: Screw Machine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: MDW-GS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.1 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\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: U101091\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SUMITOMO","offers":[{"title":"Default Title","offer_id":51752991424818,"sku":"U101091","price":105.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f2070befcebaf623666c68d7b2418ba9.jpg?v=1788931918","url":"https:\/\/voomisupply.com\/products\/sumitomo-u101091-screw-machine-drill-bit-0-277in-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}