{"product_id":"bussola-di-estensione-mk-4-3-24-1047","title":"Extension socket MK 4 \/ 3","description":"\u003cp\u003eMorse taper extension sleeve MT 4\/3 — MT 3 tool holder in MT 4 machine spindles. Fully hardened, internal and external taper ground according to DIN 2187. Made in Austria by Bernardo; Krollit has been the official distributor in Italy since 2007.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eExternal taper:\u003c\/strong\u003e MT 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternal taper:\u003c\/strong\u003e MT 3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard:\u003c\/strong\u003e DIN 2187\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProcessing:\u003c\/strong\u003e Fully hardened, ground taper\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eExternal taper (machine)\u003c\/td\u003e\n\u003ctd\u003eMT 4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal taper (tool)\u003c\/td\u003e\n\u003ctd\u003eMT 3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eDIN 2187\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProcessing\u003c\/td\u003e\n\u003ctd\u003eFully hardened, ground taper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eLogistics\u003c\/h3\u003e\n\u003cp\u003eOriginal spare parts available with 3–5 working days shipping. Customer support in Italian available.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is a MT 4\/3 extension sleeve used for and when is it necessary?\u003c\/summary\u003e\n\u003cp\u003eThe MT 4\/3 extension sleeve has an MT 4 external taper (fits into the machine) and an MT 3 internal taper (holds the tool). It allows you to mount tools with MT 3 Morse taper shanks on machines with MT 4 Morse taper spindles — the larger number is the machine taper, the smaller is the tool taper. The extension sleeve allows the smaller tool to fit into the larger spindle, maintaining DIN 2187 concentricity.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDifference between an extension sleeve and a reduction sleeve?\u003c\/summary\u003e\n\u003cp\u003eAn extension sleeve takes a smaller taper (tool) into a larger spindle (machine): MT 4\/3 → the machine has MT 4, the tool has MT 3. A reduction sleeve does the opposite — it takes a larger taper into a smaller spindle. They are not interchangeable. Always check which one you need before purchasing.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do you remove the sleeve from the Morse taper spindle?\u003c\/summary\u003e\n\u003cp\u003eWith the ejector pin (drawbar) that slides into the spindle hole: insert the pin from the opposite side and strike with a hammer. Alternatively, use the flat extraction wedge inserted into the spindle slot. Never force it with improvised tools — the Morse taper is self-locking and lateral force can damage the spindle.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDelivery times?\u003c\/summary\u003e\n\u003cp\u003eOriginal spare parts available with 3–5 working days shipping. Customer support in Italian available.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"Bernardo","offers":[{"title":"Default Title","offer_id":50725246009672,"sku":"24-1047","price":72.52,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0891\/2139\/0920\/files\/24-1047_1.jpg_1.jpg?v=1750407853","url":"https:\/\/www.krollit.com\/products\/bussola-di-estensione-mk-4-3-24-1047","provider":"Krollit","version":"1.0","type":"link"}