{"product_id":"sumitomo-u101073-screw-machine-drill-bit-0-25in-carbide","title":"Sumitomo U101073 Screw Machine Drill Bit 0.25in Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe SUMITOMO U101073 is a solid carbide screw machine length drill bit designed for high-performance drilling in ferrous and hard materials. Built to MDW-HGS series specifications, it features a 135-degree split point for accurate starts and reduced thrust, and a straight-cylindrical shank for reliable chuck retention. At 0.25 inches in diameter and 3.4646 inches overall length, this bit handles demanding production environments where short, rigid tooling is required. Coolant-through capability supports high-speed operation and helps manage heat in difficult workpiece materials. Intended for use by machinists and tool-and-die professionals in CNC and manual drilling applications.\u003c\/p\u003e\n\u003cp\u003eThis drill bit is rated for cast iron, stainless steel, and steel workpieces. The screw machine length designation indicates a shorter flute-to-shank ratio compared to jobber-length bits, providing added rigidity and reduced deflection in tight setups or multi-spindle machines. A flute-by-diameter ratio of 3xD and a maximum drilling depth of 0.9050 inches make it well suited for shallow, precise bores in production machining environments. The h8 diameter tolerance ensures consistent fit in tight-tolerance boring and reaming sequences.\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 reduces walking and lowers entry thrust\u003c\/li\u003e\n  \u003cli\u003eCoolant-through design supports high-speed feeds and extends tool life\u003c\/li\u003e\n  \u003cli\u003eStraight-cylindrical shank compatible with standard drill chucks and collets\u003c\/li\u003e\n  \u003cli\u003eTapered web configuration adds core strength across flute length\u003c\/li\u003e\n  \u003cli\u003eh8 diameter tolerance for consistent fit in precision machining sequences\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003ePart of the SUMITOMO MDW-HGS series, rated for use in cast iron, stainless steel, and steel workpieces. Drill bit size range for this series is 0.2500 to 0.3000 inches.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation and use should be performed by a qualified machinist familiar with CNC or manual drilling equipment. Ensure the spindle and workpiece are fully secured before operation, and confirm coolant lines are connected and flowing before engaging coolant-through function. Do not exceed manufacturer feed and speed recommendations for the target workpiece material, as solid carbide is brittle and susceptible to breakage under excessive lateral load. Inspect the cutting edge for chipping before each use.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 0.25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.4646 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.2795 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: 0.9050 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\u003eDrill Point Length\u003c\/strong\u003e: 0.0518 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Margins\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 3xD\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\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\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: Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Cast Iron, Stainless Steel, Steel\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-HGS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.05 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: U101073\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SUMITOMO","offers":[{"title":"Default Title","offer_id":51755808194866,"sku":"U101073","price":166.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/273dfa319f52cccf0d312190c086814e.jpg?v=1788959941","url":"https:\/\/voomisupply.com\/products\/sumitomo-u101073-screw-machine-drill-bit-0-25in-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}