{"product_id":"jacobs-jcm6309-keyed-drill-chuck-jt3-tapered-mount","title":"Jacobs JCM6309 Keyed Drill Chuck JT3 Tapered Mount","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe JACOBS JCM6309 is a keyed drill chuck designed for use with JT3 tapered spindles on stationary and portable drilling equipment. It accepts round-shank tooling from 0.18 to 0.80 inches in diameter, covering a wide range of twist drills, step drills, and similar cutting tools. The chuck body is constructed of steel with a plain bearing design and a 2.54-inch sleeve diameter. At closed position, overall length measures 4.06 inches, dropping to 3.14 inches open. Tightening is performed with a K4 key, providing positive, repeatable clamping force suited to production and maintenance drilling operations.\u003c\/p\u003e\u003cp\u003eThis chuck is appropriate for drill presses, lathes, and other machine tools fitted with a JT3 Jacobs taper spindle nose. It is a common specification in industrial maintenance shops, fabrication facilities, and trade settings where consistent chuck runout is required. Total indicated runout (TIR) is rated at 0.004 inches, making it suitable for general-purpose hole-making work where moderate accuracy is needed.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eCapacity range: 0.18 to 0.80 inches for broad tooling compatibility\u003c\/li\u003e\n\u003cli\u003eJT3 tapered mount for secure, interference-fit spindle attachment\u003c\/li\u003e\n\u003cli\u003eKeyed design with K4 key for positive clamping and repeatable grip\u003c\/li\u003e\n\u003cli\u003eSteel chuck body for durability in production and maintenance environments\u003c\/li\u003e\n\u003cli\u003eTIR of 0.004 inches for consistent general-purpose drilling accuracy\u003c\/li\u003e\n\u003cli\u003e2.54-inch sleeve diameter with plain bearing construction\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned to fit machine tool spindles with a JT3 (Jacobs Taper No. 3) tapered mount, including drill presses, lathes, and similar equipment configured for this standard taper.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a qualified machinist or maintenance technician. Before mounting, ensure the machine spindle is fully powered down and locked out per OSHA lockout\/tagout procedures. Clean both the spindle taper and chuck taper bore of oil, chips, and debris before seating. Drive the chuck onto the taper with a soft-faced mallet or arbor press to achieve full interference fit  -  do not hammer directly on the chuck sleeve or jaw assembly.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMinimum Chuck Capacity\u003c\/strong\u003e: 0.18 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Chuck Capacity\u003c\/strong\u003e: 0.80 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount Type\u003c\/strong\u003e: Tapered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Size\u003c\/strong\u003e: JT3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKey Type\u003c\/strong\u003e: Keyed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKey Number\u003c\/strong\u003e: K4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBearing Type\u003c\/strong\u003e: Plain\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChuck Material\u003c\/strong\u003e: Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSleeve Diameter\u003c\/strong\u003e: 2.54 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosed Length\u003c\/strong\u003e: 4.06 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Length\u003c\/strong\u003e: 3.14 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIR\u003c\/strong\u003e: 0.004 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 3.08 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 27112800\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: JACOBS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: JCM6309\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JACOBS CHUCK","offers":[{"title":"Default Title","offer_id":67906021163314,"sku":"JCM6309","price":425.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/f59e5959c4a22ea0757cc9b003f2bcd9.jpg?v=1791162879","url":"https:\/\/voomisupply.com\/products\/jacobs-jcm6309-keyed-drill-chuck-jt3-tapered-mount","provider":"Voomi Supply","version":"1.0","type":"link"}