{"product_id":"mandrino-a-3-griffe-ps3-250-d5","title":"3-jaw lathe chuck Bernardo PS3-250 \/ D5","description":"\u003cp\u003eThe Bernardo 3-jaw chuck PS3-250 \/ D5 is a lathe chuck for professional use, with a diameter of 250 mm and a weight of 32 kg. Krollit, official Bernardo distributor since 2007.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eChuck size: 250\/D5\u003c\/li\u003e\n\u003cli\u003eDiameter: 250 mm\u003c\/li\u003e\n\u003cli\u003eTaper: 5\u003c\/li\u003e\n\u003cli\u003eB: 103.5 mm\u003c\/li\u003e\n\u003cli\u003eD (max.): 82.578 mm\u003c\/li\u003e\n\u003cli\u003eE: 76 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWho uses the PS3-250 \/ D5 3-jaw chuck and for what purpose\u003c\/h3\u003e\n\u003cp\u003eMachine shops and artisan turners use the PS3-250 \/ D5 3-jaw chuck as a clamping accessory on metal lathes, ensuring secure clamping and centering of the workpiece during turning, drilling, and grooving operations.\u003c\/p\u003e\n\u003ch3\u003eIts place in the Bernardo range\u003c\/h3\u003e\n\u003cp\u003eThe Bernardo 3-jaw chuck PS3-250 \/ D5 is part of the Bernardo lathe chuck range, 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 support for selection assistance.\u003c\/p\u003e\n\u003ch3\u003eKrollit logistics and support\u003c\/h3\u003e\n\u003cp\u003eShipping in 3-5 business days from Krollit warehouse for spare parts and accessories. Italian-speaking customer support available for technical documentation and compatibility verification with the reference machine. Krollit is an official distributor since 2007.\u003c\/p\u003e\n\u003ch3\u003eWho is the PS3-250 \/ D5 3-jaw chuck for?\u003c\/h3\u003e\n\u003cp\u003eThe PS3-250 \/ D5 3-jaw chuck is recommended for the following professional profiles:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMachine shops and artisan turners\u003c\/strong\u003e: secure clamping of round or hexagonal workpieces on metal lathes during turning, drilling, and grooving operations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUsers with a compatible flanged Bernardo lathe\u003c\/strong\u003e: original replacement or upgrade for Bernardo range lathes (profi, hobby, etc.) with A2 mounting conforming to DIN 55029.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIrregular or non-round workpieces\u003c\/strong\u003e: for non-symmetrically centered workpieces, consider 4-jaw independent chucks or universal faceplates.\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\u003eDiameter\u003c\/td\u003e\n\u003ctd\u003e250 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTaper\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eB\u003c\/td\u003e\n\u003ctd\u003e103.5 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eD (max.)\u003c\/td\u003e\n\u003ctd\u003e82.578 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eE\u003c\/td\u003e\n\u003ctd\u003e76 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eF1\u003c\/td\u003e\n\u003ctd\u003e104.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCam-lock bolts\u003c\/td\u003e\n\u003ctd\u003e6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChuck size\u003c\/td\u003e\n\u003ctd\u003e250\/D5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax. speed\u003c\/td\u003e\n\u003ctd\u003e2000 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApprox. weight\u003c\/td\u003e\n\u003ctd\u003e32 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 3-jaw chuck?\u003c\/summary\u003e\n\u003cp\u003eSelf-centering 3-jaw chucks are for cylindrical, hexagonal, and 3-6-9-12 sided workpieces. The jaws move together with a single key (self-centering).\u003c\/p\u003e\n\u003cp\u003eIt is the most common chuck on lathes: quick clamping of symmetrical workpieces, typical concentricity precision 0.03-0.1 mm depending on the body material (steel = better precision, cast iron = standard).\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 the 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 250 mm diameter suitable for?\u003c\/summary\u003e\n\u003cp\u003eSuitable for medium-sized workpieces (max. Ø ~220 mm): professional lathes.\u003c\/p\u003e\n\u003cp\u003eThe nominal diameter of the chuck indicates the maximum body size, not the maximum workable workpiece size. Clamping capacity depends on the jaw opening (typically 60-70% of the nominal Ø).\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does the D5 mounting indicate?\u003c\/summary\u003e\n\u003cp\u003eThe D5 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 closing with cams, disassembly in 30 seconds without tools.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow is chuck precision maintained?\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 ground 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":50726466421064,"sku":"21-1055F1","price":785.93,"currency_code":"EUR","in_stock":true}],"url":"https:\/\/www.krollit.com\/products\/mandrino-a-3-griffe-ps3-250-d5","provider":"Krollit","version":"1.0","type":"link"}