{"product_id":"jack-a4c-chl-7","title":"JACK A4C-CHL-7 Single Needle Heavy Duty Double Capacity Hook Lockstitch Industrial Sewing Machine – Complete Setup, Table \u0026 Stand Included","description":"\u003cp\u003eThe \u003cstrong\u003eJACK A4C-CHL-7\u003c\/strong\u003e is the \u003cstrong\u003eheavy-material version\u003c\/strong\u003e of the JACK A4C — the same fully automatic, direct drive lockstitch, set up from the factory for thick work. Where the standard A4C runs a DB×1 needle and a 5 mm stitch for apparel, the CHL-7 steps up to a \u003cstrong\u003eDP×5 (#18–21) needle\u003c\/strong\u003e, a \u003cstrong\u003e7 mm maximum stitch length\u003c\/strong\u003e and a \u003cstrong\u003elarge double-capacity hook\u003c\/strong\u003e, with top speed set to 3,500 stitches per minute for clean penetration on heavy material.\u003c\/p\u003e\n\u003cp\u003eThe double-capacity hook carries a larger bobbin, so the machine runs longer between bobbin changes — the stop that costs the most time on long, thick seams. Feed force is managed by JACK's \u003cstrong\u003eNTB system\u003c\/strong\u003e: the \u003cstrong\u003eOctopus Nine-brain AI chip\u003c\/strong\u003e reads the material as thickness changes and sets the feed force on its own, while the 0-degree thread path lowers thread tension so the thread breaks less often.\u003c\/p\u003e\n\u003cp\u003eEverything else is the A4C you already know: \u003cstrong\u003eautomatic thread trimmer, presser foot lifter, backtack and needle positioner\u003c\/strong\u003e, stitch length set by stepper motor in 0.1 mm steps, central oil-pan lubrication and a USB port on the head. It ships complete with table and stand.\u003c\/p\u003e\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eJACK A4C-CHL-7 single needle lockstitch machine head \u003cstrong\u003e(ships assembled)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eIntegrated direct drive motor with built-in operation panel\u003c\/li\u003e\n\u003cli\u003eIndustrial sewing table and stand\u003c\/li\u003e\n\u003cli\u003eDP×5 (#18–21) needles and bobbins for the double-capacity hook\u003c\/li\u003e\n\u003cli\u003eStandard presser foot and accessories\u003c\/li\u003e\n\u003cli\u003eOperator's manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-material version of the A4C\u003c\/strong\u003e — factory-configured for thick work, not an apparel machine pushed past its range\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLarge double-capacity hook\u003c\/strong\u003e — bigger bobbin, longer runs between bobbin changes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDP×5 (#18–21) needle system\u003c\/strong\u003e — needle sizes made for thick denim, canvas and vinyl\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7 mm maximum stitch length\u003c\/strong\u003e — long, strong stitches for heavy seams and topstitching\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNTB system with Octopus Nine-brain AI chip\u003c\/strong\u003e — adjusts feed force in real time as material thickness changes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e0-degree thread path\u003c\/strong\u003e — lower thread tension and fewer thread breaks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully automatic\u003c\/strong\u003e — thread trimmer, presser foot lifter, backtack and needle positioner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStepper-motor stitch length\u003c\/strong\u003e — set to 0.1 mm, with quieter backtacking\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree function buttons at the needle bar\u003c\/strong\u003e — half stitch, add a stitch and backtack, without reaching for the panel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect drive motor built into the head\u003c\/strong\u003e — no belt, quiet running, lower power draw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3,500 stitches per minute\u003c\/strong\u003e — speed matched to heavy-material penetration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e13 mm presser foot lift\u003c\/strong\u003e — clears stacked, thick assemblies\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentral oil-pan lubrication\u003c\/strong\u003e and \u003cstrong\u003eUSB port\u003c\/strong\u003e on the head for a fan or phone charging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThick denim and jeans construction — heavy seams and multi-layer joins\u003c\/li\u003e\n\u003cli\u003eWorkwear, uniforms and heavy garment production\u003c\/li\u003e\n\u003cli\u003eCanvas goods, bags and heavy totes\u003c\/li\u003e\n\u003cli\u003eVinyl, coated and laminated materials\u003c\/li\u003e\n\u003cli\u003eFootwear and shoe upper assembly\u003c\/li\u003e\n\u003cli\u003eAwnings and outdoor heavy textiles\u003c\/li\u003e\n\u003cli\u003eLong heavy seams where bobbin changes slow the line down\u003c\/li\u003e\n\u003cli\u003eShops already running the A4C that need a dedicated heavy-material station with the same controls\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eJACK\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eA4C-CHL-7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMachine Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle Needle Direct Drive Lockstitch, Heavy-Material Version\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStitch Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLockstitch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHeavy materials\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Needles\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNumber of Threads\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNeedle System\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDP×5 (#18–21)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Sewing Speed\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3,500 SPM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Stitch Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7 mm (stepper motor, 0.1 mm adjustment)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePresser Foot Lift\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5–13 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFeed Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDrop Feed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFlatbed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHook\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLarge double-capacity hook\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAI System\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNTB — Octopus Nine-brain AI chip with 0-degree thread path\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThread Trimmer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAutomatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePresser Foot Lifter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAutomatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBacktack\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAutomatic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNeedle Positioner\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMotor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDirect drive, built into the head\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eControl\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuilt-in operation panel; 3 function buttons at the needle bar\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLubrication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCentral, oil pan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUSB Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes (fan \/ phone charging)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMachine Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e695 × 295 × 550 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight (Net \/ Gross)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e36 \/ 42 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eComplete setup with table and stand\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAssembly\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eShips Assembled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"JACK","offers":[{"title":"Default Title","offer_id":67617637335342,"sku":"A4C-CHL-7","price":1695.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0732\/1514\/8334\/files\/01-jack-a4c-chl-7-principal.jpg?v=1791056689","url":"https:\/\/suprasewing.com\/products\/jack-a4c-chl-7","provider":"Supra Sewing Online, Llc","version":"1.0","type":"link"}