{"product_id":"osg-61539-screw-machine-drill-bit-3-90-mm-tin-hss","title":"Osg 61539 Screw Machine Drill Bit 3.90 Mm Tin Hss","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe OSG 61539 is a screw machine length drill bit designed for high-performance drilling in metalworking and industrial applications. Built from high-speed steel with a titanium nitride (TiN) coating, it delivers extended tool life and reduced friction during cutting. The bit measures 3.90 mm in diameter with a 54 mm overall length, making it well-suited for short-hole drilling where rigidity and accuracy matter. The 130-degree faceted point geometry reduces thrust and improves chip evacuation on entry. Web thinning further lowers cutting resistance, particularly when drilling harder alloys. Licensed machinists, toolmakers, and maintenance mechanics are the primary installers and users of this bit.\u003c\/p\u003e\u003cp\u003eThis drill bit is intended for use in screw machines, CNC machining centers, drill presses, and hand-held power tools where a straight-cylindrical shank is compatible. It is suited for drilling steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. The short screw machine length provides greater stability and reduced deflection compared to jobber-length bits, making it a preferred choice in production drilling environments where hole position tolerance is critical.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTiN coating increases surface hardness and extends tool life on ferrous and non-ferrous materials\u003c\/li\u003e\n\u003cli\u003e130-degree faceted point angle reduces walking and improves entry accuracy on flat and curved surfaces\u003c\/li\u003e\n\u003cli\u003eWeb-thinned, tapered web configuration lowers thrust and improves chip flow\u003c\/li\u003e\n\u003cli\u003eScrew machine length body provides superior rigidity and minimizes deflection in deep setups\u003c\/li\u003e\n\u003cli\u003eRight-hand spiral flute with regular helix efficiently clears chips from the cut zone\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank at 4.00 mm diameter fits standard collets and drill chucks without modification\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eCompatible with steel, stainless steel, aluminum, aluminum alloy, and aluminum silicate workpieces. Fits standard drill chucks and collet systems accepting a 4.00 mm straight-cylindrical shank. Part of the OSG Series 1100 high-performance drill line.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis bit is installed and operated by machinists and maintenance mechanics using screw machines, CNC drilling centers, or manual drill presses. Secure the shank fully in the chuck or collet before operation and verify runout is within acceptable tolerance before drilling production parts. Use appropriate cutting fluid or coolant for steel and stainless steel applications to maintain cutting edge integrity. Inspect the cutting edge for wear or chipping before each use and replace the bit if the TiN coating is fully worn through at the cutting edge.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 3.90 mm (0.1535 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 54 mm (2.126 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 22 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 4.00 mm (0.1575 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 130 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Faceted\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: High-Speed Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\/Finish\u003c\/strong\u003e: TiN (Titanium Nitride)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\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\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Length Type\u003c\/strong\u003e: Screw Machine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute-to-Diameter Ratio\u003c\/strong\u003e: 5xD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Materials\u003c\/strong\u003e: Steel, Stainless Steel, Aluminum, Aluminum Alloy, Aluminum Silicate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter Tolerance\u003c\/strong\u003e: +0 to -0.018 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 1100\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.005 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: OSG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 61539\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"OSG","offers":[{"title":"Default Title","offer_id":51747401531698,"sku":"61539","price":42.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/239c8d83d6ceb15c626b4037e11192c9.jpg?v=1788879509","url":"https:\/\/voomisupply.com\/products\/osg-61539-screw-machine-drill-bit-3-90-mm-tin-hss","provider":"Voomi Supply","version":"1.0","type":"link"}