{"product_id":"hertel-66693581-screw-machine-drill-bit-letter-u-hss-tin","title":"Hertel 66693581 Screw Machine Drill Bit Letter U Hss Tin","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 66693581 is a screw machine length drill bit sized to Letter U (0.3680 inches decimal) with a 135-degree split point and a titanium nitride (TiN) coating over a high-speed steel body. Screw machine length drills are shorter than jobber-length bits, providing greater rigidity and reduced deflection in production drilling, CNC, and turret lathe applications. The split point geometry allows the bit to start on contact without a center punch, while web thinning keeps cutting forces manageable. Overall length is 3.125 inches with a flute length of 1.8125 inches. The right-hand spiral flute evacuates chips efficiently during through-hole and blind-hole operations.\u003c\/p\u003e\u003cp\u003eThis drill bit is suited for production shop environments, machine shops, and tool rooms where tight-tolerance holes in the 0.3500 to 0.4000 inch range are required. The heavy-duty grade construction makes it appropriate for ferrous and non-ferrous metals where a jobber-length bit would flex or chatter. It installs in any drill press, CNC machining center, or turret lathe with a straight-shank chuck capable of accepting a 0.3680-inch diameter shank. Each package contains one bit.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eLetter U size: 0.3680 inches decimal, fitting the 0.3500 to 0.4000 inch drill bit size range\u003c\/li\u003e\n\u003cli\u003e135-degree split point starts on contact  -  no center punch required\u003c\/li\u003e\n\u003cli\u003eTiN coating improves surface hardness and reduces friction at the cutting edge\u003c\/li\u003e\n\u003cli\u003eScrew machine (stub) length body adds rigidity and minimizes runout vs. jobber-length bits\u003c\/li\u003e\n\u003cli\u003eWeb-thinned parallel web reduces thrust load during entry\u003c\/li\u003e\n\u003cli\u003eRight-hand regular spiral flute design for consistent chip evacuation\u003c\/li\u003e\n\u003cli\u003eNo coolant-through requirement  -  compatible with flood, mist, or dry cutting setups\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a screw machine length replacement or production drill bit for any straight-shank chuck or collet system accepting a 0.3680-inch shank diameter; typical applications include drill presses, CNC machining centers, and turret lathes working in the Letter U bore size.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is performed by machinists or tool-room personnel. Power down and lock out the machine before loading or unloading the bit from the chuck or collet. Verify chuck capacity matches the 0.3680-inch shank diameter before tightening. Inspect the cutting edges and TiN coating for wear or chipping before each production run  -  do not use a bit with a damaged point, as it will produce out-of-tolerance holes.\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 Inch)\u003c\/strong\u003e: 0.3680 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.8125 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3680 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: High-Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiN (Titanium Nitride)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral\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: Parallel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Thinning\u003c\/strong\u003e: Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size Range\u003c\/strong\u003e: 0.3500 to 0.4000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: HERTEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 66693581\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51743326765362,"sku":"66693581","price":21.02,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/0d5e575e92a965ac6d05c546a7aae11d.jpg?v=1788845675","url":"https:\/\/voomisupply.com\/products\/hertel-66693581-screw-machine-drill-bit-letter-u-hss-tin","provider":"Voomi Supply","version":"1.0","type":"link"}