{"product_id":"bk40-thk-ball-support-unit","title":"BK40 THK Ball Screw Support Unit","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eTHK square fixed-side support unit for ball screws with a 40 mm bearing journal diameter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe BK40 contains a factory-preloaded P5 angular-contact bearing set in a DF arrangement, providing accurate shaft positioning and high axial rigidity. Its compact housing allows straightforward installation without additional bearing adjustment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe unit is supplied complete with its housing, bearing set, holding lid, collars, seals, lock nut and locking screw.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eProduct characteristics\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCategory: Ball screw support units\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eManufacturer: THK\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSeries: BK\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eDesign: Square support unit\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMounting position: Fixed side\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBearing journal diameter: 40 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBearing arrangement: DF angular-contact arrangement\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBearing accuracy: P5\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBearing used: 7208 equivalent\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePreload: Factory adjusted\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eWeight: 6.500 kg\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCountry of origin: Japan\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eMain dimensions\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eShaft diameter d: 40 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eLength L: 61 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eL1: 18 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eL2: 76 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eL3: 15 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHousing width B: 160 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHousing height H: 110 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHousing thickness b: 80 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eShaft centre height h1: 60 mm ±0.02 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eB1: 100 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eH1: 90 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eE: 37 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMounting-hole pitch P: 130 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eC1: 33 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eC2: 14 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSquare dimension T: 50 mm\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eMounting-hole dimensions\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThrough-hole diameter d1: 18 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCounterbore diameter d2: 26 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCounterbore depth h: 17.5 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHolding-lid thread M: M8\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCollar dimensions\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCollar outside diameter D: 49.4 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCollar thickness t: 15 mm\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eLoad ratings\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eBasic dynamic axial load rating Ca: 44.1 kN\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eStatic permissible axial load: 27.1 kN\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAxial rigidity: 270 N\/μm\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eComponents supplied\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eHousing: 1\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePrecision bearing set: 1\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHolding lid: 1\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCollars: 2\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSeals: 2\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eLock nut: 1\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eHexagonal socket-head locking screw with set piece: 1\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe BK40 is designed for the fixed end of a ball screw and can be paired with a THK BF40 supported-side unit.\u003c\/span\u003e\u003c\/p\u003e","brand":"THK","offers":[{"title":"Default Title","offer_id":58559439405437,"sku":"BK40-THK","price":625.02,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0588\/9684\/2842\/files\/THKBKImage1_3e40d63f-7884-4bf3-81ee-e17e43ce2bb6.jpg?v=1787156003","url":"https:\/\/bearing-king.co.uk\/products\/bk40-thk-ball-support-unit","provider":"Bearing King","version":"1.0","type":"link"}