{"product_id":"guhring-9038990017800-micro-drill-bit-1-78-mm-carbide","title":"Guhring 9038990017800 Micro Drill Bit 1.78 Mm Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe GUHRING 9038990017800 is a solid carbide micro drill bit engineered for precision drilling in demanding metalworking applications. It features a 1.78 mm diameter with a 140-degree faceted point angle and a TiAlN coating that extends tool life in abrasive materials. The flute length measures 12 mm, with an overall length of 38 mm and a 3 mm straight-cylindrical shank. A web-thinned point reduces thrust load and improves centering accuracy at entry. This drill is designed for use by machinists, tool-and-die makers, and precision fabricators working with small-bore hole requirements.\u003c\/p\u003e\n\u003cp\u003eThis drill bit is suited for drilling cast iron and steel in production and maintenance machining environments. The 5xD flute-to-diameter ratio supports moderate-depth holes up to a maximum drilling depth of 9.33 mm. The right-hand spiral flute geometry promotes efficient chip evacuation in both CNC and manual drilling operations. Series 3899 positions this tool for high-precision micro-hole work where tight diameter tolerance and consistent geometry are required across repeated cycles.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eSolid carbide construction in material grade K40 for rigidity and wear resistance in ferrous materials\u003c\/li\u003e\n  \u003cli\u003eTiAlN coating improves heat resistance and extends cutting tool life in cast iron and steel\u003c\/li\u003e\n  \u003cli\u003e140-degree faceted point angle with web thinning reduces entry thrust and improves hole position accuracy\u003c\/li\u003e\n  \u003cli\u003eStraight-cylindrical shank at 3 mm diameter fits standard collet and drill chuck toolholders\u003c\/li\u003e\n  \u003cli\u003eh7 diameter tolerance on the drill body supports close-tolerance hole requirements\u003c\/li\u003e\n  \u003cli\u003eRight-hand cut with regular spiral flute for consistent chip flow and surface finish\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style precision micro drill for use in CNC machining centers, drill presses, and manual machines equipped with toolholders accepting a 3 mm straight-cylindrical shank. Primary workpiece materials are cast iron and steel.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstall this drill bit into a clean, properly sized collet or drill chuck and verify runout before cutting. Power down and lock out the machine spindle before changing tooling. Follow shop-standard speeds and feeds for solid carbide micro drills in the target workpiece material, as excessive feed rate is the primary cause of micro-drill breakage. Coolant-through is not supported by this tool; use external coolant or misting as appropriate for the material being drilled.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 1.78 mm (0.0701 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 140 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Faceted\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 38 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 12 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 9.33 mm (0.367 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 3 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\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\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeb Thinning\u003c\/strong\u003e: Web-Thinned\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial Grade\u003c\/strong\u003e: K40\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiAlN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: h7\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 5xD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Cast Iron, Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 3899\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.01 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: GUHRING\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 9038990017800\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GUHRING","offers":[{"title":"Default Title","offer_id":51747618521394,"sku":"9038990017800","price":49.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a3b1ff8f610a0e8d8a5a6079767ab2b1_645c7abd-a6ec-4368-801c-f7e5aadc46f6.jpg?v=1788883547","url":"https:\/\/voomisupply.com\/products\/guhring-9038990017800-micro-drill-bit-1-78-mm-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}