{"product_id":"top-tool-250mm-4-jaw-independent-plain-back-clamping-15-250mm","title":"TOP-TOOL 250mm \/ 10-Inch 4-Jaw Independent Lathe Chuck, Plain Back, Clamping Range 15–250 mm (0.59–9.84 in), T-Key","description":"\u003ch2\u003eProfessional 250mm \/ 10-Inch 4-Jaw Independent Lathe Chuck (Plain Back)\u003c\/h2\u003e\n\u003cp\u003eThe TOP-TOOL \u003cstrong\u003efour-jaw independent\u003c\/strong\u003e chuck holds round, square, rectangular, and irregular parts by adjusting \u003cstrong\u003eeach jaw separately\u003c\/strong\u003e. Unlike a self-centering scroll chuck, you can \u003cstrong\u003edial in concentricity\u003c\/strong\u003e with a dial indicator or intentionally \u003cstrong\u003eoffset\u003c\/strong\u003e the work for boring or turning eccentric features. This listing is the \u003cstrong\u003eplain back\u003c\/strong\u003e configuration—machine an \u003cstrong\u003eadapter plate\u003c\/strong\u003e to match \u003cstrong\u003eD1\u003c\/strong\u003e, \u003cstrong\u003eD2\u003c\/strong\u003e, and the bolt pattern (adapter not included).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEnvelope reference:\u003c\/strong\u003e combined internal-jaw and external-jaw ranges cover approximately \u003cstrong\u003e15–250 mm (0.59–9.84 in)\u003c\/strong\u003e depending on jaw orientation and setup.\u003c\/p\u003e\n\u003ch3\u003eMaterials\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eComponent\u003c\/th\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody\u003c\/td\u003e\n\u003ctd\u003eHigh-grade gray cast iron (HT200 \/ HT300 class, series dependent)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJaws\u003c\/td\u003e\n\u003ctd\u003eHardened steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eScrew\u003c\/td\u003e\n\u003ctd\u003eHardened steel \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eClamping ranges\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eInternal jaws (A–A1):\u003c\/strong\u003e 15–130 mm — typical OD gripping with jaws in the standard orientation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExternal jaws (B–B1):\u003c\/strong\u003e 80–250 mm — clamping larger diameters \/ reverse-jaw style holding per factory chart.\u003c\/p\u003e\n\u003cp\u003eUse the jaw positions and factory instructions that match your operation; the \u003cstrong\u003eoverall span\u003c\/strong\u003e above is a quick reference only.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndependent jaws:\u003c\/strong\u003e Four separate adjustments for square, round, or off-center work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlain back (D1\/D2):\u003c\/strong\u003e Recess diameter \u003cstrong\u003eD1 = 100 mm\u003c\/strong\u003e, depth \u003cstrong\u003eh = 6 mm\u003c\/strong\u003e; bolt circle \u003cstrong\u003eD2 = 120 mm\u003c\/strong\u003e; \u003cstrong\u003e4× M12\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThrough hole D3:\u003c\/strong\u003e 65 mm for bar work (confirm against your bar stock).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeights:\u003c\/strong\u003e \u003cstrong\u003eH = 117.5 mm\u003c\/strong\u003e overall, \u003cstrong\u003eH1 = 82 mm\u003c\/strong\u003e body thickness reference.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT-Key included\u003c\/strong\u003e for jaw adjustment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cp\u003e\u003cem\u003eDimensions from factory K72-series plain-back table; clamping from K72 clamping-range chart.\u003c\/em\u003e\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChuck diameter (D)\u003c\/td\u003e\n\u003ctd\u003e250 mm (9.84 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD1 (mounting recess diameter)\u003c\/td\u003e\n\u003ctd\u003e100 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eh (recess depth)\u003c\/td\u003e\n\u003ctd\u003e6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD2 (bolt circle diameter)\u003c\/td\u003e\n\u003ctd\u003e120 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD3 (through hole)\u003c\/td\u003e\n\u003ctd\u003e65 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH (overall height)\u003c\/td\u003e\n\u003ctd\u003e117.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH1 (body thickness)\u003c\/td\u003e\n\u003ctd\u003e82 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal jaws (A–A1)\u003c\/td\u003e\n\u003ctd\u003e15–130 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal jaws (B–B1)\u003c\/td\u003e\n\u003ctd\u003e80–250 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting\u003c\/td\u003e\n\u003ctd\u003e4× M12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNet weight\u003c\/td\u003e\n\u003ctd\u003e21.3 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eShafts, rings, and rounds where you want manual control of runout.\u003c\/li\u003e\n\u003cli\u003eSquare or rectangular billets; weldments and castings with uneven OD.\u003c\/li\u003e\n\u003cli\u003eLight eccentric turning when the machine and setup allow.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eLathe swing must clear diameter \u003cstrong\u003eD\u003c\/strong\u003e and fully extended jaws. Build or purchase an adapter that matches \u003cstrong\u003eD1\u003c\/strong\u003e, \u003cstrong\u003eD2\u003c\/strong\u003e, and the listed bolt pattern.\u003c\/p\u003e\n\u003ch3\u003eMaintenance\u003c\/h3\u003e\n\u003cp\u003eKeep jaw slides clean; lubricate per factory practice with \u003cstrong\u003echuck grease\u003c\/strong\u003e or light oil suitable for slideways.\u003c\/p\u003e\n\u003ch3\u003eSafety\u003c\/h3\u003e\n\u003cp\u003eNever leave the chuck key engaged; respect safe RPM for size and balance.\u003c\/p\u003e","brand":"TOP-TOOL","offers":[{"title":"Default Title","offer_id":46879007867065,"sku":null,"price":212.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0735\/9542\/0857\/files\/K7280-630.png?v=1776302833","url":"https:\/\/toptool.ca\/fr\/products\/top-tool-250mm-4-jaw-independent-plain-back-clamping-15-250mm","provider":"TOP-TOOL","version":"1.0","type":"link"}