{"product_id":"hertel-74131939-screw-machine-drill-bit-letter-t-cobalt","title":"Hertel 74131939 Screw Machine Drill Bit Letter T Cobalt","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe HERTEL 74131939 is a screw machine length drill bit designed for high-production drilling in metal fabrication, machining, and maintenance applications. Built from cobalt steel and coated with TiAlN (titanium aluminum nitride), this bit delivers extended tool life in hard and abrasive materials. The 135-degree split point reduces walking and thrust load on entry, allowing faster, cleaner starts without a center punch. At 3-1\/16 inches overall length with a 1-3\/4 inch flute length, the stub-style body provides rigidity for accurate hole placement. The straight-cylindrical shank fits standard drill chucks. Size T corresponds to 0.3580 inches decimal equivalent.\u003c\/p\u003e\u003cp\u003eThis bit is suited for drilling ferrous metals, stainless steel, cast iron, and high-hardness alloys where standard HSS tooling wears prematurely. The screw machine length format is common on CNC machining centers, turret lathes, and drill presses where reduced stick-out improves hole straightness and minimizes chatter. Machinists, tool-and-die makers, and maintenance technicians working in industrial and commercial environments use this style of bit for production runs and precision work. The regular spiral and parallel web configuration supports consistent chip evacuation in through-hole applications.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCobalt steel construction for superior heat and wear resistance in hard materials\u003c\/li\u003e\n\u003cli\u003eTiAlN coating extends tool life and reduces friction at elevated cutting temperatures\u003c\/li\u003e\n\u003cli\u003e135-degree split point for self-centering entry and reduced thrust\u003c\/li\u003e\n\u003cli\u003eWeb-thinned, parallel web for improved chip flow and reduced torque\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank fits standard drill chucks without adapters\u003c\/li\u003e\n\u003cli\u003eScrew machine (stub) length provides extra rigidity for accurate hole geometry\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use in standard drill chucks and collet holders accepting straight-cylindrical shanks. Fits drilling applications requiring a Letter T (0.3580 inch) diameter hole in the 0.3500 to 0.4000 inch drill size range.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use of this bit should be performed by qualified machinists or maintenance personnel familiar with drill press, lathe, or CNC equipment operation. Secure the shank fully in the chuck or collet and verify runout before cutting. Always wear appropriate eye protection and follow shop safety protocols for rotating tooling. Disengage spindle power completely before changing or inspecting the bit.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Letter)\u003c\/strong\u003e: T\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.3580 inches\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\u003eOverall Length\u003c\/strong\u003e: 3-1\/16 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1-3\/4 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\u003ePoint Type\u003c\/strong\u003e: Split\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: TiAlN\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: Spiral\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\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\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.4 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: HERTEL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 74131939\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HERTEL","offers":[{"title":"Default Title","offer_id":51739404599602,"sku":"74131939","price":22.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/78f949619e39248df49521b277f821e6.jpg?v=1788814184","url":"https:\/\/voomisupply.com\/products\/hertel-74131939-screw-machine-drill-bit-letter-t-cobalt","provider":"Voomi Supply","version":"1.0","type":"link"}