{"product_id":"cleveland-c15927-jobber-drill-bit-wire-21-cobalt-135-deg","title":"Cleveland C15927 Jobber Drill Bit Wire 21 Cobalt 135 Deg","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe CLEVELAND C15927 is a cobalt jobber-length drill bit sized to wire gauge #21 (0.1590 inches diameter). Built from M42 cobalt high-speed steel with an oxide coating, it is designed for heavy-duty drilling in superalloys, stainless steel, and other tough materials. The 135-degree split point reduces walking at startup and lowers thrust force. A fast-spiral, two-flute design with a web-thinned, tapered web improves chip evacuation and cutting efficiency. Overall length is 3.25 inches with a flute length of 1.0625 inches and a straight-cylindrical shank of 0.1590 inches diameter. It conforms to ASME B94.11M and carries a NAS specification designation.\u003c\/p\u003e\u003cp\u003eThis bit is suited for production and maintenance drilling operations where standard high-speed steel bits wear prematurely. Typical applications include aerospace component work, industrial maintenance, and precision metalworking where superalloy, heat-resistant alloy, and hardened steel workpieces are encountered. The right-hand cutting direction and fast spiral make it appropriate for use in handheld drill motors, drill presses, and CNC setups handling difficult-to-machine materials. Series 3780 bits are classed as heavy-duty grade for demanding shop environments.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eM42 cobalt HSS construction resists heat buildup in hard and superalloy materials\u003c\/li\u003e\n\u003cli\u003e135-degree split point starts on contact, reducing drill walking and required thrust\u003c\/li\u003e\n\u003cli\u003eOxide coating provides additional surface hardness and lubricity\u003c\/li\u003e\n\u003cli\u003eFast-spiral, two-flute geometry promotes efficient chip removal\u003c\/li\u003e\n\u003cli\u003eWeb-thinned tapered web reduces cutting resistance at the center of the bit\u003c\/li\u003e\n\u003cli\u003eStraight-cylindrical shank fits standard drill chucks without adapters\u003c\/li\u003e\n\u003cli\u003eConforms to ASME B94.11M; NAS specification designation; Heavy Duty grade\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as a heavy-duty replacement or stock bit for applications requiring a wire gauge #21 (0.1590 inches) diameter hole in superalloys, stainless, and similarly hard metals. Fits any standard drill chuck accepting a 0.1590-inch straight-cylindrical shank.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eThis bit is installed by machinists, toolroom technicians, and industrial maintenance trades using drill presses, mill-drill machines, or hand drills. Secure the straight shank firmly in the chuck before use. Use appropriate cutting fluid or coolant — note this bit does not support coolant-through delivery — and ensure workpiece is clamped securely to prevent movement during drilling. Inspect the cutting edges for wear after use in superalloy materials, as even cobalt bits experience accelerated edge wear in high-nickel alloys.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Wire)\u003c\/strong\u003e: #21\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Size (Decimal Inch)\u003c\/strong\u003e: 0.1590 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Material\u003c\/strong\u003e: Cobalt (M42 HSS)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Point Angle\u003c\/strong\u003e: 135 degrees\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoint Type\u003c\/strong\u003e: Split\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Type\u003c\/strong\u003e: Spiral (Fast)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Flutes\u003c\/strong\u003e: 2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCutting Direction\u003c\/strong\u003e: Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish \/ Coating\u003c\/strong\u003e: Oxide\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeb Configuration\u003c\/strong\u003e: Tapered, Web-Thinned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 3.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFlute Length\u003c\/strong\u003e: 1.0625 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Length\u003c\/strong\u003e: 2.1875 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Diameter\u003c\/strong\u003e: 0.1590 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Straight-Cylindrical\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Diameter Tolerance\u003c\/strong\u003e: -0.0007 to 0.0000 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary Workpiece Material\u003c\/strong\u003e: Superalloy\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Bit Grade\u003c\/strong\u003e: Heavy Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries\u003c\/strong\u003e: 3780\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard\u003c\/strong\u003e: ASME B94.11M\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecification Designation\u003c\/strong\u003e: NAS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoolant Through\u003c\/strong\u003e: No\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1 pound\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: CLEVELAND\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: C15927\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"CLEVELAND CONTROLS","offers":[{"title":"Default Title","offer_id":51717458690354,"sku":"C15927","price":14.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/02e10a3a26bea41aaf797649b8e4efcc_066bc5c9-c704-4773-a3d7-b92aa3fec7bb.jpg?v=1788540801","url":"https:\/\/voomisupply.com\/products\/cleveland-c15927-jobber-drill-bit-wire-21-cobalt-135-deg","provider":"Voomi Supply","version":"1.0","type":"link"}