{"product_id":"guhring-9038990006400-micro-drill-bit-size-72-solid-carbide","title":"Guhring 9038990006400 Micro Drill Bit Size 72 Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe GUHRING 9038990006400 is a solid carbide micro drill bit sized at wire gauge 72 (0.0252 inches decimal), designed for precision drilling in demanding industrial and machining environments. Built from K40-grade solid carbide and coated with TiAlN for heat resistance and extended tool life, this bit delivers consistent performance in tight-tolerance applications. It features a 140-degree faceted point with web thinning to reduce thrust and improve centering at entry. The spiral flute design with a 5xD flute-to-diameter ratio promotes chip evacuation in shallow holes. Overall length is 38 mm with a 3 mm straight-cylindrical shank sized to an h7 tolerance for accurate chuck fitment. Installed by machinists and tool-and-die professionals on CNC and manual drilling equipment.\u003c\/p\u003e\n\u003cp\u003eThis micro drill bit is suited for precision drilling in cast iron and steel workpieces where small-diameter, close-tolerance holes are required. The 140-degree point angle is well matched to harder ferrous materials, reducing walking and improving entry accuracy. With a maximum drilling depth of 6.04 mm (0.2380 inches) and a flute length of 7.00 mm, it is intended for shallow through-holes and blind holes in production and prototype machining. The straight-cylindrical shank fits standard collet chucks and drill chucks compatible with 3 mm shank tooling. Part of the Guhring Series 3899 micro drill family.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eK40-grade solid carbide construction for rigidity and wear resistance in ferrous materials\u003c\/li\u003e\n  \u003cli\u003eTiAlN coating improves heat resistance and extends tool life in steel and cast iron\u003c\/li\u003e\n  \u003cli\u003e140-degree faceted point with web thinning reduces thrust and improves entry accuracy\u003c\/li\u003e\n  \u003cli\u003eSpiral flute with 5xD ratio promotes consistent chip evacuation in shallow holes\u003c\/li\u003e\n  \u003cli\u003eh7 shank diameter tolerance ensures accurate, repeatable chuck registration\u003c\/li\u003e\n  \u003cli\u003eRight-hand cut, regular spiral type for standard CNC and manual drilling setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with standard collet chucks or drill chucks accepting a 3 mm straight-cylindrical shank. Primary workpiece materials are cast iron (material code K) and steel (material code P) as specified by the manufacturer for the Series 3899.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eMicro drill bits of this diameter require a rigid, well-trammed spindle setup to prevent deflection and breakage. Secure the shank fully in a precision collet or drill chuck before operation, and confirm runout is within tolerance for the application. Reduce feed rates and spindle speeds incrementally when dialing in a new setup with carbide micro tooling. Avoid side loading the bit during entry or retraction, as solid carbide at this diameter is brittle under lateral force.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Wire)\u003c\/strong\u003e: 72\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.0252 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Solid Carbide (K40 grade)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiAlN\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\u003eWeb Thinning\u003c\/strong\u003e: Web-Thinned\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 (Regular)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 7.00 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 5xD\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 38.00 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 3.00 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter Tolerance\u003c\/strong\u003e: h7\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 6.04 mm (0.2380 inches)\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\u003eCoolant Through\u003c\/strong\u003e: No\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: 0.003 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: 9038990006400\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GUHRING","offers":[{"title":"Default Title","offer_id":51748348690738,"sku":"9038990006400","price":46.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a3b1ff8f610a0e8d8a5a6079767ab2b1_ee9ac7a4-1c5d-488f-bdb8-e68413350c12.jpg?v=1788892785","url":"https:\/\/voomisupply.com\/products\/guhring-9038990006400-micro-drill-bit-size-72-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}