{"product_id":"jacobs-31415-keyless-drill-chuck-5-8-in-4mt-taper-shank","title":"Jacobs 31415 Keyless Drill Chuck 5\/8 in 4MT Taper Shank","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe JACOBS 31415 is a keyless drill chuck designed for heavy-duty drilling applications on machine tools equipped with a No. 4 Morse taper (4MT) spindle. The chuck accepts drill shanks and tooling from 7\/64 inch (0.118 inch) up to 5\/8 inch (0.630 inch), covering the full range of standard twist drills, end mills with straight shanks, and other round-shank tooling commonly used in production and maintenance machining. The keyless design allows for fast, hand-tightened tool changes without a chuck key. Ball bearing construction supports smooth rotation up to 4000 RPM. The sleeve diameter is 2.13 inches and closed length is 3.78 inches. Machinists, tool-and-die technicians, and maintenance trades install this chuck on drill presses, lathes, and milling machines.\u003c\/p\u003e\n\u003cp\u003eThe JACOBS 31415 is suited for both job-shop and industrial maintenance environments where a reliable, repeatable 4MT taper chuck is needed. The integral shank mount seats directly into a No. 4 Morse taper spindle bore, eliminating the need for a separate arbor. Typical applications include production drilling on floor-model drill presses, quill-mounted setups on knee mills, and tailstock use on engine lathes where a 4MT taper is standard. The steel chuck body handles the radial and axial loads generated by moderate-to-heavy drilling and reaming cycles. Total indicated runout (TIR) of 0.0016 inch supports accurate hole placement and clean entry cuts.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eKeyless operation for fast tool changes without a chuck key\u003c\/li\u003e\n  \u003cli\u003eCapacity range from 7\/64 inch to 5\/8 inch for broad tooling compatibility\u003c\/li\u003e\n  \u003cli\u003eNo. 4 Morse taper integral shank mounts directly to 4MT spindle bores\u003c\/li\u003e\n  \u003cli\u003eBall bearing construction rated to 4000 RPM\u003c\/li\u003e\n  \u003cli\u003eTIR of 0.0016 inch for accurate, repeatable chuck runout\u003c\/li\u003e\n  \u003cli\u003eSteel chuck body for durability under production drilling loads\u003c\/li\u003e\n  \u003cli\u003eSleeve diameter of 2.13 inches and closed length of 3.78 inches\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for machine tool spindles with a No. 4 Morse taper (4MT) bore, including drill presses, engine lathes, and milling machines that use an integral shank taper mount without a separate arbor.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation is performed by machinists or qualified maintenance technicians. Before mounting, power down and lock out the machine spindle per OSHA lockout\/tagout procedures. Clean the 4MT spindle bore and chuck shank thoroughly to remove oil, chips, and debris before seating the taper to ensure full contact and accurate runout. Drive the chuck shank firmly into the spindle bore with a soft-faced mallet; do not use a steel hammer directly on the chuck body. To remove, use the appropriate drift and knockout bar for 4MT tapers.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMinimum Capacity\u003c\/strong\u003e: 7\/64 inch (0.118 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Capacity\u003c\/strong\u003e: 5\/8 inch (0.630 inch)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMount Type\u003c\/strong\u003e: Integral Shank\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMounting Size\u003c\/strong\u003e: 4MT (No. 4 Morse Taper)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShank Type\u003c\/strong\u003e: Taper\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eKey Type\u003c\/strong\u003e: Keyless\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBearing Type\u003c\/strong\u003e: Ball\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: 2.13 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eClosed Length\u003c\/strong\u003e: 3.78 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOpen Length\u003c\/strong\u003e: 3.35 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTIR\u003c\/strong\u003e: 0.0016 inch\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum RPM\u003c\/strong\u003e: 4000\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 4.375 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: JACOBS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 31415\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JACOBS CHUCK","offers":[{"title":"Default Title","offer_id":67915132764466,"sku":"31415","price":628.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/831eda33ac548dab93039724da052a02.jpg?v=1791252373","url":"https:\/\/voomisupply.com\/products\/jacobs-31415-keyless-drill-chuck-5-8-in-4mt-taper-shank","provider":"Voomi Supply","version":"1.0","type":"link"}