{"product_id":"mandrino-a-4-griffe-dk12-400-d8","title":"Bernardo 4-jaw lathe chuck DK12-400\/D8","description":"\u003cp\u003eThe Bernardo 4-jaw chuck DK12-400\/D8 is a professional-grade lathe chuck with a diameter of 400 mm and a weight of 101 kg. Krollit has been the official Bernardo distributor since 2007.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eChuck size: 400\/D8\u003c\/li\u003e\n\u003cli\u003eD - Diameter: 400 mm\u003c\/li\u003e\n\u003cli\u003eTaper: 8\u003c\/li\u003e\n\u003cli\u003eD1 (max.): 139.734 mm\u003c\/li\u003e\n\u003cli\u003eD2: 171.4 mm\u003c\/li\u003e\n\u003cli\u003eD3: 130 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho uses the DK12-400\/D8 4-jaw chuck and for what\u003c\/h3\u003e\n\u003cp\u003eMechanical workshops and artisan turners use the DK12-400\/D8 4-jaw chuck as a clamping accessory on metal lathes, ensuring secure clamping and workpiece centering during turning, drilling, and grooving operations.\u003c\/p\u003e\n\u003ch3\u003eIts place in the Bernardo range\u003c\/h3\u003e\n\u003cp\u003eThe Bernardo 4-jaw chuck DK12-400\/D8 is part of Bernardo's range of lathe chucks, distributed in Italy by Krollit since 2007. The Bernardo range includes models of various categories and performances: to choose the right machine for your use case, you can consult the Bernardo catalog on Krollit or contact customer service for selection support.\u003c\/p\u003e\n\u003ch3\u003eKrollit logistics and support\u003c\/h3\u003e\n\u003cp\u003eShipping within 3-5 business days from Krollit warehouse for spare parts and accessories. Customer service in Italian available for technical documentation and compatibility verification with the reference machine. Krollit has been an official distributor since 2007.\u003c\/p\u003e\n\u003ch3\u003eWho is the DK12-400\/D8 4-jaw chuck for\u003c\/h3\u003e\n\u003cp\u003eThe DK12-400\/D8 4-jaw chuck is recommended for the following professional profiles:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical workshops and artisan turners\u003c\/strong\u003e: Secure clamping of round or hexagonal workpieces on metal lathes for turning, drilling, and grooving operations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsers with a Bernardo lathe with a compatible flange\u003c\/strong\u003e: Original replacement or upgrade for Bernardo range lathes (profi, hobby, etc.) with A2 mount according to DIN 55029.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIrregular or non-round shaped workpieces\u003c\/strong\u003e: For non-symmetrically centered workpieces, consider independent 4-jaw chucks or universal platforms.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eChuck size\u003c\/td\u003e\n\u003ctd\u003e400\/D8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD - Diameter\u003c\/td\u003e\n\u003ctd\u003e400 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTaper\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD1 (max.)\u003c\/td\u003e\n\u003ctd\u003e139.734 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD2\u003c\/td\u003e\n\u003ctd\u003e171.4 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD3\u003c\/td\u003e\n\u003ctd\u003e130 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH1\u003c\/td\u003e\n\u003ctd\u003e126 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. speed\u003c\/td\u003e\n\u003ctd\u003e1000 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApprox. weight\u003c\/td\u003e\n\u003ctd\u003e101 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen to use a 4-jaw chuck?\u003c\/summary\u003e\n\u003cp\u003eSelf-centering 4-jaw chucks are for square and 4-8 sided workpieces. The jaws move together with a single key.\u003c\/p\u003e\n\u003cp\u003eThe self-centering 4-jaw chuck (not independent jaws) clamps square or octagonal workpieces symmetrically. For off-center (eccentric, asymmetrical) clamping, independent jaw chucks are needed.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat material is the chuck body made of?\u003c\/summary\u003e\n\u003cp\u003eThe material is indicated in the title: steel (PO series) for maximum precision, cast iron (DK\/PS series) for standard use.\u003c\/p\u003e\n\u003cp\u003eThe choice depends on intensity of use and required tolerance: steel for production and precision, cast iron for general use.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat workpieces is the Ø 400 mm diameter suitable for?\u003c\/summary\u003e\n\u003cp\u003eSuitable for medium-large workpieces (max. Ø ~360 mm): industrial lathes.\u003c\/p\u003e\n\u003cp\u003eThe nominal diameter of the chuck indicates the maximum body size, not the maximum machinable workpiece size. Clamping capacity depends on jaw opening (typically 60-70% of nominal Ø).\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the D8 mounting indicate?\u003c\/summary\u003e\n\u003cp\u003eThe D8 code (Camlock according to DIN 55029) identifies the size of the lathe spindle nose: D3-D5 for small lathes, D6-D8 for medium, D11-D15 for industrial.\u003c\/p\u003e\n\u003cp\u003eCheck the mounting of your lathe before purchase: the interface flange must exactly match the code. Camlock = quick-release with cams, disassembly in 30 seconds without tools.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow to maintain chuck precision?\u003c\/summary\u003e\n\u003cp\u003eRegular cleaning of the spiral mechanism, periodic lubrication with specific chuck grease, concentricity check every 6 months with a dial indicator.\u003c\/p\u003e\n\u003cp\u003eA jaw that moves with difficulty indicates chips or rust in the mechanism: disassemble, clean, and grease. Concentricity is checked by mounting a rectified bar and measuring with a dial indicator: acceptable tolerance 0.03-0.1 mm depending on the model.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Bernardo","offers":[{"title":"Default Title","offer_id":50726485524808,"sku":"21-0842","price":1445.95,"currency_code":"EUR","in_stock":true}],"url":"https:\/\/www.krollit.com\/products\/4-jaw-chuck-dk12-400-d8","provider":"Krollit","version":"1.0","type":"link"}