{"product_id":"chicago-latrobe-48921-screw-machine-drill-bit-21-64-in-hss","title":"Chicago-latrobe 48921 Screw Machine Drill Bit 21\/64 in Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe CHICAGO-LATROBE 48921 is a screw machine length drill bit designed for general-purpose drilling in a wide range of materials. Built from high-speed steel (HSS) with a bright\/uncoated finish, it features a 21\/64-inch (0.3281-inch) diameter and a left-hand cutting direction, making it suited for applications that require reverse-rotation drilling. The 118-degree standard point angle and web-thinned tip promote clean entry and reduce walking on start. Overall length is 2-15\/16 inches, keeping the bit compact and rigid for short-reach drilling tasks. This bit is used by machinists, maintenance technicians, and trade professionals working with non-ferrous metals, plastics, and wood.\u003c\/p\u003e\n\u003cp\u003eThe 48921 fits into standard drill chucks and CNC machine spindles accepting straight-shank tooling at 0.3281 inches (8.33 mm) shank diameter. Its screw machine length design provides extra rigidity compared to jobber-length bits, which reduces deflection in close-tolerance or repetitive production drilling. Primary workpiece materials listed by the manufacturer include aluminum, copper, magnesium, slate, thermoplastic, and wood. The 1-11\/16-inch flute length handles moderate chip evacuation needs in shallow-to-medium depth holes. Series 157L denotes the left-hand orientation within the CHICAGO-LATROBE product line.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eLeft-hand cutting direction for reverse-rotation drilling and broken-fastener extraction applications\u003c\/li\u003e\n  \u003cli\u003eHSS construction with bright\/uncoated finish for use in non-ferrous metals, plastics, and wood\u003c\/li\u003e\n  \u003cli\u003eWeb-thinned, parallel-web tip geometry reduces thrust and improves point centering\u003c\/li\u003e\n  \u003cli\u003eScrew machine length body provides increased rigidity and reduced deflection versus jobber-length bits\u003c\/li\u003e\n  \u003cli\u003eStraight shank at 0.3281 inches diameter fits standard drill chucks and collet holders\u003c\/li\u003e\n  \u003cli\u003eManufactured to ISO standards with a diameter tolerance of +0.0000 to -0.0010 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a general-purpose replacement or production drill bit for use in any standard straight-shank drill chuck or collet system accepting a 0.3281-inch shank. Suitable for benchtop drill presses, hand drills, and CNC drilling operations targeting aluminum, copper, magnesium, slate, thermoplastic, and wood workpieces.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstall and remove drill bits with the machine fully powered off and the spindle at a complete stop. Secure the straight shank firmly in the chuck or collet to the full depth of the shank before tightening. Left-hand bits require the drill or machine to be set to reverse rotation to cut; confirm spindle direction before engaging the workpiece. Inspect the cutting edges and point geometry before each use and replace the bit if chipping or excessive wear is present.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 21\/64 inches (0.3281 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 2-15\/16 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1-11\/16 inches (1.6875 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.3281 inches (8.33 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 1-1\/4 inches (1.2500 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 118 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Left Hand\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\u003eShank Type\u003c\/strong\u003e: Straight\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Standard\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Parallel, Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: High-Speed Steel (HSS)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: Bright\/Uncoated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Length Type\u003c\/strong\u003e: Screw Machine\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Materials\u003c\/strong\u003e: Aluminum, Copper, Magnesium, Slate, Thermoplastic, Wood\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: +0.0000 to -0.0010 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandards\u003c\/strong\u003e: ISO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 157L\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Performance\u003c\/strong\u003e: General Purpose\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.0549 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: CHICAGO-LATROBE\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 48921\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CHICAGO-LATROBE","offers":[{"title":"Default Title","offer_id":51755150147890,"sku":"48921","price":24.18,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/518c0de47979ead31d0df119a6682214.jpg?v=1788951572","url":"https:\/\/voomisupply.com\/products\/chicago-latrobe-48921-screw-machine-drill-bit-21-64-in-hss","provider":"Voomi Supply","version":"1.0","type":"link"}