{"product_id":"guhring-9038990003800-micro-drill-bit-0-38mm-solid-carbide","title":"Guhring 9038990003800 Micro Drill Bit 0.38mm Solid Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe GUHRING 9038990003800 is a solid carbide micro drill bit designed for precision drilling in demanding industrial and toolroom applications. Built from K40-grade carbide and coated with TiAlN for heat and wear resistance, this bit operates at a 0.38 mm diameter with a 140-degree faceted point that delivers accurate entry and clean hole geometry. The right-hand spiral flute configuration evacuates chips efficiently, while the web-thinned point reduces thrust and minimizes deflection at small diameters. Licensed machinists, tool-and-die technicians, and precision manufacturing shops are the typical end users for this class of tooling.\u003c\/p\u003e\n\u003cp\u003eThis drill bit is suited for precision micro-hole drilling in cast iron and steel workpieces. With a flute-to-diameter ratio of 5xD and a maximum drilling depth of 5.43 mm, it handles shallow-to-moderate depth holes in ferrous materials common to mold making, die work, medical device manufacturing, and electronics component fabrication. The straight-cylindrical shank at 3.00 mm diameter allows direct chucking in standard collet or drill chuck setups on CNC machining centers, drill presses, and precision manual machines.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e0.38 mm cutting diameter with h7 diameter tolerance for tight, consistent hole sizing\u003c\/li\u003e\n  \u003cli\u003eTiAlN coating provides elevated-temperature wear resistance in ferrous and abrasive materials\u003c\/li\u003e\n  \u003cli\u003e140-degree faceted point with web thinning reduces entry thrust and improves positional accuracy\u003c\/li\u003e\n  \u003cli\u003eK40-grade solid carbide construction delivers rigidity and edge retention at micro scale\u003c\/li\u003e\n  \u003cli\u003e5xD flute-to-diameter ratio supports drilling depths up to 5.43 mm\u003c\/li\u003e\n  \u003cli\u003eRight-hand spiral flute promotes efficient chip evacuation in blind and through-hole applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as a Series 3899 micro drill bit for use in cast iron and steel workpieces. Suitable for use in any precision spindle or collet system accepting a 3.00 mm straight-cylindrical shank.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation and operation of micro drill bits should be performed by qualified machinists or toolroom technicians familiar with high-speed precision drilling. Before mounting, ensure the spindle or collet is clean and free of runout, as any eccentricity at this diameter scale significantly increases breakage risk. Use the lowest feasible entry feed rate and confirm spindle speed matches the manufacturer recommendations for the workpiece material. Never apply side load to the bit during drilling operations.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 0.38 mm (0.0150 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 38.00 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 6.00 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 3.00 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 5.43 mm (0.2140 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\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 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\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDiameter Tolerance\u003c\/strong\u003e: h7\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\u003ePrimary Workpiece Material\u003c\/strong\u003e: Cast Iron, Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 5xD\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: 9038990003800\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GUHRING","offers":[{"title":"Default Title","offer_id":51728549118258,"sku":"9038990003800","price":51.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/a3b1ff8f610a0e8d8a5a6079767ab2b1_c4bd36c1-9466-4984-86ae-c60af5ccb33a.jpg?v=1788693164","url":"https:\/\/voomisupply.com\/products\/guhring-9038990003800-micro-drill-bit-0-38mm-solid-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}