{"title":"3\u00264-Jaw Metal Lathe Chucks","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003eShop metal lathe chucks for common turning and workholding applications. This collection includes 3-jaw and 4-jaw lathe chucks in popular sizes such as 80mm \/ 3 inch, 100mm \/ 4 inch, and 125mm \/ 5 inch. Choose from self-centering lathe chucks for quick setup or independent 4-jaw lathe chucks for more flexible workpiece adjustment. Selected options include reversible jaws and chuck keys.\u003c\/p\u003e","products":[{"product_id":"3-jaw-self-centering-chuck","title":"3 Jaw Self Centering Chuck for Mini Metal Lathe","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eThe Autobox 3 jaw self centering chuck is a K11-series scroll chuck sized for hobbyist and bench lathes. All three jaws advance and retract simultaneously via a single scroll plate, centering round and hex stock automatically with each tightening. Available in 3\", 4\", and 5\" body diameters to match the capacity of your lathe spindle.\u003c\/p\u003e\u003ch2\u003eAvailable Options\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3 inch (80mm)\u003c\/strong\u003e — K11-80 — fits smaller mini lathes and rotary table work\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 inch (100mm)\u003c\/strong\u003e — K11-100 — the most common size for 7x10 through 7x14 mini lathes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 inch (125mm)\u003c\/strong\u003e — K11-125 — for 8x16 and similar larger bench lathes\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eThree-jaw scroll mechanism: single T-key tightens all three jaws simultaneously for fast, repeatable centering\u003c\/li\u003e\n\u003cli\u003eRunout tolerance ≤0.05mm (0.002\") — consistent with K11 series specification\u003c\/li\u003e\n\u003cli\u003eReversible jaws: standard internal jaws for gripping round and hex stock; reverse for clamping larger OD workpieces\u003c\/li\u003e\n\u003cli\u003eHardened steel jaws — heat-treated for wear resistance\u003c\/li\u003e\n\u003cli\u003eChuck key included — T-handle wrench ships with every unit\u003c\/li\u003e\n\u003cli\u003eThree mounting bolt holes for direct spindle nose attachment (back plate or adapter may be required — see Compatibility section)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eBody Diameter\u003c\/th\u003e\n\u003cth\u003eSKU\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eK11-80\u003c\/td\u003e\n\u003ctd\u003e3\" \/ 80mm\u003c\/td\u003e\n\u003ctd\u003eK11-80\u003c\/td\u003e\n\u003ctd\u003e$54.95\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eK11-100\u003c\/td\u003e\n\u003ctd\u003e4\" \/ 100mm\u003c\/td\u003e\n\u003ctd\u003eK11-100\u003c\/td\u003e\n\u003ctd\u003e$69.95\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eK11-125\u003c\/td\u003e\n\u003ctd\u003e5\" \/ 125mm\u003c\/td\u003e\n\u003ctd\u003eK11-125\u003c\/td\u003e\n\u003ctd\u003e$84.95\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cstrong\u003eJaw type:\u003c\/strong\u003e Reversible (internal + external use)\u003cbr\u003e\u003cstrong\u003eDrive:\u003c\/strong\u003e Single-scroll, 3-pinion bevel gear\u003cbr\u003e\u003cstrong\u003eRunout:\u003c\/strong\u003e ≤0.05mm (0.002\")\u003cbr\u003e\u003cstrong\u003eMounting:\u003c\/strong\u003e 3-bolt pattern, flat-back — spindle nose adapter or back plate required for most mini lathes\u003c\/p\u003e\u003ch2\u003eCompatibility\u003c\/h2\u003e\u003cp\u003eThis 3 jaw self centering chuck mounts to the lathe headstock spindle nose. Compatibility depends on your spindle nose type and bolt circle diameter — most mini lathes require a threaded or D1-style adapter back plate (sold separately). The 4\" (K11-100) is the most commonly used size for 7x10 through 7x14 mini lathes.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHarbor Freight 7x10 Central Machinery (#93212) — headstock MT3 spindle, requires adapter back plate\u003c\/li\u003e\n\u003cli\u003eHarbor Freight 7x12 Central Machinery (#44142) — requires adapter back plate\u003c\/li\u003e\n\u003cli\u003eSieg C2 \/ SC2 \/ C3 mini lathe — requires adapter back plate\u003c\/li\u003e\n\u003cli\u003eGrizzly G8688 (7x12) — requires adapter back plate\u003c\/li\u003e\n\u003cli\u003eGrizzly G0765 (7x14) — requires adapter back plate\u003c\/li\u003e\n\u003cli\u003eAutobox 7x14 \/ 8x16 — designed to accept K11-100 (4\") and K11-125 (5\") with included spindle adapter\u003c\/li\u003e\n\u003cli\u003eLittleMachineShop HiTorque 7x16 — requires adapter back plate\u003c\/li\u003e\n\u003cli\u003eMicro-Mark 7x16 — requires adapter back plate\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Verify your lathe's spindle nose thread or bolt circle diameter before ordering. Message us with your machine model and we will confirm the correct adapter.\u003c\/p\u003e\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e1× K11-series 3-jaw self-centering chuck (your selected size)\u003c\/li\u003e\n\u003cli\u003e1× T-handle chuck key (wrench)\u003c\/li\u003e\n\u003cli\u003e1× Set of reverse jaws\u003c\/li\u003e\n\u003cli\u003e3× Mounting bolts\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cem\u003eNote: Adapter back plate for your specific spindle nose is sold separately.\u003c\/em\u003e\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eQ: Do I need a back plate or adapter to mount this chuck?\u003c\/strong\u003e\u003cbr\u003eA: Yes, for most mini lathes. This chuck uses a flat-back 3-bolt pattern. You will need a threaded or D1-style adapter back plate to match your lathe's spindle nose. Contact us with your lathe model and we can point you to the correct adapter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the difference between the 3\", 4\", and 5\" sizes?\u003c\/strong\u003e\u003cbr\u003eA: The size refers to the outer body diameter of the chuck. The 4\" (K11-100) is the most common fit for 7x10 through 7x14 mini lathes. The 3\" (K11-80) is for smaller machines or rotary table use. The 5\" (K11-125) is suited for 8x16 and larger bench lathes where the headstock can support the added diameter and mass.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I use this chuck to hold square or irregular stock?\u003c\/strong\u003e\u003cbr\u003eA: No — a 3-jaw self-centering chuck is designed for round and hex stock only. The three jaws move simultaneously, so they cannot independently adjust to grip irregular shapes. For irregular or off-center workpieces, see our 4-jaw independent chuck.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: What is the runout accuracy of this chuck?\u003c\/strong\u003e\u003cbr\u003eA: The K11 series is rated at ≤0.05mm (0.002\") TIR. Real-world runout also depends on adapter fit, jaw condition, and workpiece surface. If you need tighter concentricity, indicate stock diameter and we can advise on jaw selection.\u003c\/p\u003e\u003ch2\u003eWhy Buy from Autobox\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eShips from our US warehouse in Toledo, OH — typical 3-5 business day delivery\u003c\/li\u003e\n\u003cli\u003eUS-based customer support — email us your lathe model and we'll confirm fit\u003c\/li\u003e\n\u003cli\u003e30-day returns, no restocking fee\u003c\/li\u003e\n\u003cli\u003eK11-series chuck: the same scroll-chuck standard used in vocational programs and small machine shops across North America\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Autobox","offers":[{"title":"3 inch","offer_id":46727460159625,"sku":"K11-80","price":54.95,"currency_code":"USD","in_stock":true},{"title":"4 inch","offer_id":46727460192393,"sku":"K11-100","price":69.95,"currency_code":"USD","in_stock":true},{"title":"5 inch","offer_id":46727460225161,"sku":"K11-125","price":84.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0762\/4923\/5593\/files\/3_4jawchuck.webp?v=1778730983"},{"product_id":"4-jaw-independent-chuck","title":"4 Jaw Independent Chuck for Metal Lathe — 3\", 4\", 5\"","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Autobox K72 series 4 jaw independent chuck gives you individual control over each jaw — unlike a self-centering chuck where all jaws move at once, each jaw on this chuck adjusts separately via its own screw. That means you can grip square stock, rectangular bar, castings, forgings, and irregular shapes, or deliberately offset a round workpiece for eccentric turning. Available in 3\" (80mm), 4\" (100mm), and 5\" (125mm) diameters to fit mini lathes and bench lathes commonly used by hobbyist machinists.\u003c\/p\u003e\n\u003ch2\u003eAvailable Options\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\" (80mm) — K72-80\u003c\/strong\u003e: suited for smaller mini lathes and light workpieces, $52.95\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4\" (100mm) — K72-100\u003c\/strong\u003e: most common size for 7\" swing mini lathes, $62.95\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5\" (125mm) — K72-125\u003c\/strong\u003e: suited for larger mini lathes and bench lathes with adequate swing clearance, $74.95\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndividual jaw adjustment\u003c\/strong\u003e: each of the four jaws moves independently via a dedicated adjustment screw — no scroll plate, no linked movement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eK72 series construction\u003c\/strong\u003e: hardened steel jaws and body; K72 series is the industry-standard designation for 4-jaw independent lathe chucks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGrips any cross-section\u003c\/strong\u003e: round, square, rectangular, hex, octagonal, or irregular — any shape that fits within the jaw travel range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEccentric and off-center turning\u003c\/strong\u003e: deliberately position a round workpiece off-center for crankshaft-style operations, offset bores, and cam lobes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChuck key included\u003c\/strong\u003e: T-handle chuck wrench included for adjusting each jaw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree diameter options\u003c\/strong\u003e: 80mm (3\"), 100mm (4\"), and 125mm (5\") to match your lathe's swing and your workpiece size\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eK72-80\u003c\/th\u003e\n\u003cth\u003eK72-100\u003c\/th\u003e\n\u003cth\u003eK72-125\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChuck diameter\u003c\/td\u003e\n\u003ctd\u003e80mm (3\")\u003c\/td\u003e\n\u003ctd\u003e100mm (4\")\u003c\/td\u003e\n\u003ctd\u003e125mm (5\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of jaws\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJaw type\u003c\/td\u003e\n\u003ctd\u003eIndependent (single-acting)\u003c\/td\u003e\n\u003ctd\u003eIndependent (single-acting)\u003c\/td\u003e\n\u003ctd\u003eIndependent (single-acting)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eK72-80\u003c\/td\u003e\n\u003ctd\u003eK72-100\u003c\/td\u003e\n\u003ctd\u003eK72-125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice\u003c\/td\u003e\n\u003ctd\u003e$52.95\u003c\/td\u003e\n\u003ctd\u003e$62.95\u003c\/td\u003e\n\u003ctd\u003e$74.95\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis chuck mounts to the headstock spindle nose of your lathe. Most mini lathes use an MT3 headstock taper with a threaded spindle nose — an adapter backplate (sold separately) is required to mount this chuck to your spindle. Verify your spindle nose thread and diameter before ordering. Confirmed compatible machines:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSieg C2 \/ SC2 \/ C3 (MT3 headstock, verify spindle thread for backplate sizing)\u003c\/li\u003e\n\u003cli\u003eHarbor Freight 7x10 #93212 (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eHarbor Freight 7x12 #44142 (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eGrizzly G0765 7x14 (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eGrizzly G8688 7x12 (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eLittleMachineShop HiTorque 7x16 (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eAutobox 7x14 \/ 8x16 (MT3 headstock)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure if this fits your spindle? Email us a photo of your spindle nose — we will confirm before you order.\u003c\/p\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1x K72 series 4-jaw independent chuck (your selected size)\u003c\/li\u003e\n\u003cli\u003e1x T-handle chuck key \/ chuck wrench\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: adapter backplate is NOT included. Most mini lathe installations require a backplate matched to your spindle nose thread and diameter. See our compatible backplates or contact us with your lathe model.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp data-start=\"198\" data-end=\"557\"\u003e\u003cstrong data-start=\"198\" data-end=\"295\"\u003eQ: What is the difference between a 4-jaw independent chuck and a 4-jaw self-centering chuck?\u003c\/strong\u003e\u003cbr data-start=\"295\" data-end=\"298\"\u003e\u003cstrong data-start=\"298\" data-end=\"304\"\u003eA:\u003c\/strong\u003e A 4-jaw self-centering chuck moves all jaws together, so round and square stock centers quickly. A 4-jaw independent chuck adjusts each jaw separately, so it can hold irregular shapes and offset round work for eccentric turning, but setup takes longer.\u003c\/p\u003e\n\u003cp data-start=\"559\" data-end=\"930\"\u003e\u003cstrong data-start=\"559\" data-end=\"662\"\u003eQ: When should I choose a 4-jaw independent chuck instead of a 3-jaw or 4-jaw self-centering chuck?\u003c\/strong\u003e\u003cbr data-start=\"662\" data-end=\"665\"\u003e\u003cstrong data-start=\"665\" data-end=\"671\"\u003eA:\u003c\/strong\u003e Choose a 4-jaw independent chuck when you need to hold square, rectangular, hex, or irregular stock, perform eccentric turning, re-center a part for a second operation, or grip castings and forgings. For routine round stock, a self-centering chuck is faster.\u003c\/p\u003e\n\u003cp data-start=\"932\" data-end=\"1243\"\u003e\u003cstrong data-start=\"932\" data-end=\"1007\"\u003eQ: Do I need an adapter backplate to mount this chuck on my mini lathe?\u003c\/strong\u003e\u003cbr data-start=\"1007\" data-end=\"1010\"\u003e\u003cstrong data-start=\"1010\" data-end=\"1016\"\u003eA:\u003c\/strong\u003e Yes, in most cases. This chuck has a flat back with mounting holes and does not thread directly onto the spindle. You need a backplate matched to your spindle nose thread and register size. If unsure, send us your lathe model.\u003c\/p\u003e\n\u003cp data-start=\"1245\" data-end=\"1535\"\u003e\u003cstrong data-start=\"1245\" data-end=\"1295\"\u003eQ: Which size should I choose — 3\", 4\", or 5\"?\u003c\/strong\u003e\u003cbr data-start=\"1295\" data-end=\"1298\"\u003e\u003cstrong data-start=\"1298\" data-end=\"1304\"\u003eA:\u003c\/strong\u003e Choose based on your lathe’s swing and workpiece size. The 4\" K72-100 is the most common for 7x10 and 7x14 mini lathes. The 3\" K72-80 suits lighter work. The 5\" K72-125 needs enough swing clearance, so confirm fit before ordering.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Autobox","offers":[{"title":"3 inch","offer_id":46727462322313,"sku":"K72-80","price":52.95,"currency_code":"USD","in_stock":true},{"title":"4 inch","offer_id":46727462355081,"sku":"K72-100","price":62.95,"currency_code":"USD","in_stock":true},{"title":"5 inch","offer_id":46727462387849,"sku":"K72-125","price":74.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0762\/4923\/5593\/files\/4JawIndependentChuck.webp?v=1778731233"},{"product_id":"4-jaw-self-centering-chuck","title":"4 Jaw Self Centering Chuck for Metal Lathe — 3\", 4\", 5\"","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eThe Autobox K12 series 4 jaw self centering chuck mounts to your lathe's headstock spindle nose and grips round or square stock using all four jaws simultaneously. Unlike a 4-jaw independent chuck — where each jaw is adjusted separately — the K12 self-centering scroll mechanism moves all four jaws in unison with a single wrench, delivering quick, repeatable centering without dial-indicator setup. Available in 3-inch (80 mm), 4-inch (100 mm), and 5-inch (125 mm) diameters to suit mini lathes through medium bench lathes.\u003c\/p\u003e\n\u003ch2\u003eAvailable Options\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3 inch (80 mm)\u003c\/strong\u003e — K12-80 — $64.95 — suited to 7x10 and 7x12 mini lathes; compact footprint for small-bore turning\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 inch (100 mm)\u003c\/strong\u003e — K12-100 — $79.95 — most popular size for 7x14 and 8x16 mini lathes; balanced capacity and rigidity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5 inch (125 mm)\u003c\/strong\u003e — K12-125 — $94.95 — for medium bench lathes; larger through-bore capacity for longer stock\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimultaneous 4-jaw scroll drive:\u003c\/strong\u003e one bevel pinion turns the scroll, moving all four jaws together — faster setup than a 4-jaw independent chuck\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eK12 series construction:\u003c\/strong\u003e hardened scroll plate and jaw serrations; body material matched to K12 industry standard for chuck runout ≤0.05 mm (0.002\")\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReversible jaws:\u003c\/strong\u003e internal jaws for gripping shaft OD; flip to external jaw configuration for larger-diameter OD or face-plate work\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour-jaw grip on square stock:\u003c\/strong\u003e four contact points give more secure grip on square bar than a 3-jaw, with less risk of jaw marks on round stock than an independent chuck\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChuck key included:\u003c\/strong\u003e T-handle bevel-drive chuck wrench included with each size; fits all four pinion sockets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree sizes, one product page:\u003c\/strong\u003e select 3\", 4\", or 5\" diameter from the variant dropdown — same K12 mechanism, scaled to your machine\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003e3 inch (K12-80)\u003c\/th\u003e\n\u003cth\u003e4 inch (K12-100)\u003c\/th\u003e\n\u003cth\u003e5 inch (K12-125)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChuck diameter\u003c\/td\u003e\n\u003ctd\u003e80 mm (3.15\")\u003c\/td\u003e\n\u003ctd\u003e100 mm (3.94\")\u003c\/td\u003e\n\u003ctd\u003e125 mm (4.92\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eK12-80\u003c\/td\u003e\n\u003ctd\u003eK12-100\u003c\/td\u003e\n\u003ctd\u003eK12-125\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNumber of jaws\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003ctd\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eJaw type\u003c\/td\u003e\n\u003ctd colspan=\"3\"\u003eReversible — internal and external configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDrive mechanism\u003c\/td\u003e\n\u003ctd colspan=\"3\"\u003eScroll plate (self-centering) — all 4 jaws move simultaneously\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRunout (TIR)\u003c\/td\u003e\n\u003ctd colspan=\"3\"\u003e≤0.05 mm (≤0.002\") at jaw faces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMounting method\u003c\/td\u003e\n\u003ctd colspan=\"3\"\u003eBolt-on to spindle nose via back plate (back plate sold separately)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChuck wrench included\u003c\/td\u003e\n\u003ctd colspan=\"3\"\u003eYes — T-handle bevel-drive wrench\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003eThis chuck mounts to the lathe headstock spindle nose via a bolt-on back plate. \u003cstrong\u003eA matching adapter back plate is required and sold separately\u003c\/strong\u003e — the chuck does not mount directly into the MT3 headstock taper. Select a back plate matched to your specific spindle nose thread and register diameter.\u003c\/p\u003e\n\u003cp\u003eCompatible lathe models (with appropriate adapter back plate):\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSieg C2 \/ SC2 \/ C3 mini lathes (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eHarbor Freight 7x10 #93212 and 7x12 #44142 (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eGrizzly G0602, G0765 (7x14), and G8688 (7x12) (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eLittleMachineShop HiTorque 7x16 (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eAutobox 7x14 and 8x16 mini lathes (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eSouth Bend 9\" lathe (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eJet BD-X series bench lathes (MT3 headstock)\u003c\/li\u003e\n\u003cli\u003eAtlas \/ Craftsman 12\"x36\" (MT3 headstock)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure if your lathe's spindle nose matches? Message us with your lathe model — we'll confirm the correct back plate before you order.\u003c\/p\u003e\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 × K12 series 4-jaw self-centering chuck (size as selected)\u003c\/li\u003e\n\u003cli\u003e1 × T-handle chuck wrench (fits all 4 pinion sockets)\u003c\/li\u003e\n\u003cli\u003e1 × Set of jaw mounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Adapter back plate is NOT included. A back plate matched to your spindle nose thread and register is required for installation.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the difference between a 4-jaw self-centering chuck and a 4-jaw independent chuck?\u003c\/strong\u003e\u003cbr\u003eA: In a self-centering chuck (this K12 series), all four jaws move simultaneously through a single scroll gear — turn any of the four bevel pinion sockets and all jaws tighten or open together. This centers round or square stock automatically and quickly. In a 4-jaw independent chuck (our K72 series, sold separately), each jaw is adjusted individually using its own screw. Independent chucks allow precise off-center or eccentric workholding and can grip irregular shapes, but require a dial indicator and more setup time. If you mostly turn round or square bar and want fast centering, choose this self-centering K12. If you need off-center or irregular workholding, choose the K72 independent chuck.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Autobox","offers":[{"title":"3 inch","offer_id":46727462420617,"sku":"K12-80","price":64.95,"currency_code":"USD","in_stock":true},{"title":"4 inch","offer_id":46727462453385,"sku":"K12-100","price":79.95,"currency_code":"USD","in_stock":true},{"title":"5 inch","offer_id":46727462486153,"sku":"K12-125","price":94.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0762\/4923\/5593\/files\/4_Jaw_Self_Centering_Chuck_Jaw_Key.webp?v=1778731625"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0762\/4923\/5593\/collections\/3_4_jaw_chuck.webp?v=1777948184","url":"https:\/\/autoboxtoolworks.com\/collections\/3-4-jaw-metal-lathe-chucks.oembed","provider":"AutoBoxToolWorks","version":"1.0","type":"link"}