{"product_id":"yg-1-d4147221-screw-machine-drill-bit-letter-u-cobalt-tin","title":"YG-1 D4147221 Screw Machine Drill Bit Letter U Cobalt Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe YG-1 D4147221 is a screw machine length drill bit designed for high-productivity drilling in metal fabrication, machining, and maintenance applications. Built from cobalt high-speed steel with a titanium nitride (TiN) coating, this bit handles tough materials including alloy steels, stainless steel, and cast iron where standard HSS tooling falls short. The 135-degree split point geometry reduces walking on entry and cuts axial thrust, allowing faster penetration without a center punch in most setups. At 0.3680 inches (Letter U), it covers a commonly called-out size in precision hole work and tap drilling. The straight shank is compatible with standard drill chucks across a wide range of machines.\u003c\/p\u003e\u003cp\u003eThis drill bit is suited for screw machine operations, CNC drilling centers, drill presses, and hand-held power drills where a shorter, stiffer flute length improves rigidity and reduces deflection in production environments. The screw machine length profile is shorter than a jobber-length bit, making it ideal for tight clearance setups or high-volume repetitive drilling where chatter and bit flex are concerns. It is a practical choice for machinists, tool and die techs, and maintenance mechanics working with ferrous and non-ferrous metals.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCobalt construction for heat resistance in hard and abrasive materials\u003c\/li\u003e\n\u003cli\u003eTiN coating extends surface hardness and reduces friction at the cutting edge\u003c\/li\u003e\n\u003cli\u003e135-degree split point reduces thrust and eliminates walking on entry\u003c\/li\u003e\n\u003cli\u003eScrew machine length body provides increased rigidity over jobber-length bits\u003c\/li\u003e\n\u003cli\u003eRight-hand cut with regular spiral flute geometry for efficient chip evacuation\u003c\/li\u003e\n\u003cli\u003eStraight shank fits standard 3-jaw drill chucks without adapters\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or direct tooling option for screw machine drill bit applications requiring a Letter U size at 0.3680 inches with a straight shank and standard drill chuck fitment.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstall into a properly sized and tightened drill chuck before powering on the machine. Secure the workpiece firmly before drilling to prevent rotation and bit breakage. Use cutting fluid or coolant appropriate to the base material when drilling ferrous metals to preserve coating life and edge integrity. Inspect the cutting edge before use and replace if chipping or wear is observed, as a damaged split point will increase thrust and reduce hole quality.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: U\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal)\u003c\/strong\u003e: 0.3680 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Cobalt\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiN (Titanium Nitride)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Split Point\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\u003eFlute Type\u003c\/strong\u003e: Regular Spiral\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.37 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 23241635\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: YG-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: D4147221\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"YG-1","offers":[{"title":"Default Title","offer_id":67919154610482,"sku":"D4147221","price":25.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ba133c57650d636a3cb0e4cd54d4ec66.jpg?v=1791276094","url":"https:\/\/voomisupply.com\/products\/yg-1-d4147221-screw-machine-drill-bit-letter-u-cobalt-tin","provider":"Voomi Supply","version":"1.0","type":"link"}