{"product_id":"osg-6156911-screw-machine-drill-bit-letter-i-tialn-hss","title":"Osg 6156911 Screw Machine Drill Bit Letter I Tialn Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe OSG 6156911 is a screw machine length drill bit sized to Letter I (0.2720 inch \/ 6.91 mm) and designed for high-performance drilling in steel, stainless steel, aluminum, and other non-ferrous materials. Built from vanadium high-speed steel and finished with a TiAlN coating, the bit runs a 120-degree, 4-facet point with web thinning to reduce entry force and improve chip evacuation. Overall length is 3.0709 inches (78.00 mm) with a 34.00 mm flute length and a straight cylindrical shank of 8.00 mm (0.3150 inch) diameter. The compact screw machine length makes it well suited for CNC machining centers, turret lathes, and other setups with limited tool clearance.\u003c\/p\u003e\n\u003cp\u003eThis drill is intended for production and job-shop environments where consistent hole quality and tool life in demanding workpiece materials are required. The 5xD flute-to-diameter ratio and tapered web configuration support reliable chip flow in interrupted or deep-entry passes. It is appropriate for machinists and toolroom professionals working with ferrous and non-ferrous stock, particularly in applications where a standard jobber-length drill would be too long or insufficiently rigid. The right-hand, regular spiral flute geometry suits standard spindle rotation on conventional and CNC machine tools.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLetter I size: 0.2720 inch (6.91 mm) diameter with a tolerance of +0 to -0.022 mm\u003c\/li\u003e\n  \u003cli\u003eTiAlN coating extends tool life in steel and stainless steel applications\u003c\/li\u003e\n  \u003cli\u003e120-degree, 4-facet point with web thinning reduces thrust and improves centering\u003c\/li\u003e\n  \u003cli\u003eVanadium high-speed steel construction for toughness in high-performance cutting\u003c\/li\u003e\n  \u003cli\u003eScrew machine (stub) length at 3.0709 inches OAL increases rigidity over jobber-length designs\u003c\/li\u003e\n  \u003cli\u003eStraight cylindrical shank (8.00 mm) fits standard drill chucks and collet holders\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or direct-use cutting tool for machine setups requiring a Letter I screw machine length drill bit with a straight shank. Suitable for use in drill chucks and collet systems accepting an 8.00 mm straight shank. Primary workpiece materials include steel, stainless steel, aluminum, and non-ferrous alloys per OSG Series 1100 specifications.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified machinist following standard toolroom practices. Secure the shank fully in a properly sized chuck or collet and verify runout before engaging the workpiece. Ensure the machine spindle is fully stopped and locked out before inserting or removing the bit. Do not exceed the tool manufacturer's recommended feeds and speeds for the workpiece material and coating type.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: I\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.2720 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (mm)\u003c\/strong\u003e: 6.91 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 120 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: 4 Facet\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.0709 inches (78.00 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 34.00 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3150 inch (8.00 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Vanadium High Speed Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiAlN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpiral Type\u003c\/strong\u003e: Regular\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute-to-Diameter Ratio\u003c\/strong\u003e: 5xD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter Tolerance\u003c\/strong\u003e: +0 to -0.022 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Steel, Stainless Steel, Aluminum, Non-Ferrous\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 1100\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: 0.035 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: OSG\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 6156911\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51727742501170,"sku":"6156911","price":79.11,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/8fb891b805ec4cc06a9fbb22f4b9e646.jpg?v=1788681542","url":"https:\/\/voomisupply.com\/products\/osg-6156911-screw-machine-drill-bit-letter-i-tialn-hss","provider":"Voomi Supply","version":"1.0","type":"link"}