{"product_id":"kennametal-4151638-screw-machine-drill-bit-1-70mm-carbide","title":"Kennametal 4151638 Screw Machine Drill Bit 1.70mm Carbide","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe KENNAMETAL 4151638 is a screw machine length (stub) drill bit designed for precision drilling in metalworking and machining applications. Built from solid carbide and coated with TiAlN (TiN tip) for heat and wear resistance, this bit handles demanding materials encountered in production environments. It measures 1.70 mm in diameter with an overall length of 58.00 mm (2.2835 inches) and features a 140-degree split point for accurate self-starting entry and reduced thrust. The straight-cylindrical shank measures 4.00 mm in diameter, and the maximum drilling depth is 6.00 mm. It is manufactured to DIN 6537K specification.\u003c\/p\u003e\u003cp\u003eThis drill bit is suited for use in CNC machining centers, drill presses, and screw machine operations where tight tolerances and short flute geometry are required. The stub length provides added rigidity, making it appropriate for high-speed production drilling in steel, stainless steel, cast iron, and similar ferrous and non-ferrous materials. It is typically used by machinists, tool-and-die technicians, and CNC operators in job shop and production manufacturing settings. The 3xD flute-to-diameter ratio and tapered web configuration support chip evacuation in short-hole drilling cycles.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSolid carbide construction for rigidity and wear resistance in hard materials\u003c\/li\u003e\n\u003cli\u003eTiAlN multilayer coating with TiN tip for elevated heat resistance and extended tool life\u003c\/li\u003e\n\u003cli\u003e140-degree point angle for accurate entry and reduced walking on entry\u003c\/li\u003e\n\u003cli\u003eStub (screw machine) length provides greater rigidity than jobber-length equivalents\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank at 4.00 mm diameter for standard collet or chuck mounting\u003c\/li\u003e\n\u003cli\u003eManufactured to DIN 6537K specification for dimensional consistency\u003c\/li\u003e\n\u003cli\u003eRight-hand cutting with regular spiral flute for standard chip evacuation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a DIN 6537K-compliant stub drill bit in the KENNAMETAL B041A-CPG series, compatible with any spindle or chuck system accepting a 4.00 mm straight-cylindrical shank.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation and use should be performed by qualified machinists or CNC technicians familiar with carbide tooling. Ensure the spindle or collet chuck is clean and properly torqued before seating the shank to prevent runout, which can fracture carbide at small diameters. Coolant-through is not supported on this bit; external coolant or cutting fluid is recommended to manage heat. Avoid hand-feeding against carbide tooling — use controlled feed rates appropriate for the workpiece material and machine rigidity.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter\u003c\/strong\u003e: 1.70 mm (0.0669 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 58.00 mm (2.2835 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 9.00 mm (0.3543 inches)\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\u003eShank Length\u003c\/strong\u003e: 28.00 mm (1.1024 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Drilling Depth\u003c\/strong\u003e: 6.00 mm (0.2362 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\u003eDrill Point Length\u003c\/strong\u003e: 0.26 mm (0.0103 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTool Material\u003c\/strong\u003e: Solid Carbide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoating\u003c\/strong\u003e: TiAlN Multilayer with TiN Tip\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-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute by Diameter Ratio\u003c\/strong\u003e: 3xD\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter Tolerance\u003c\/strong\u003e: -0.014 to 0.000 mm (-0.0006 to 0.0000 inches)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Length Type\u003c\/strong\u003e: Stub\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification\u003c\/strong\u003e: DIN 6537K\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: B041A-CPG\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity\u003c\/strong\u003e: 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.03 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: KENNAMETAL\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 4151638\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"KENNAMETAL","offers":[{"title":"Default Title","offer_id":51736879759666,"sku":"4151638","price":94.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/027550a92e9fb7c9c67a753ee7e2e1a8_167ee802-4e0e-43c8-8c19-dd9439236958.jpg?v=1788781455","url":"https:\/\/voomisupply.com\/products\/kennametal-4151638-screw-machine-drill-bit-1-70mm-carbide","provider":"Voomi Supply","version":"1.0","type":"link"}