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6. DUPLEX ARRANGEMENT. DB: Duplex pair, back to back mounting. DF: Duplex pair, face to face mounting. DT: Duplex pair, tandem mounting. G: Single bearings, flush ground universal mount for DB, DF and DT arrangement. GD2: Pair of universally mountable bearings. +A: Spacer (A is nominal width of spacer in mm).What is the nomenclature for Precision Bearings (P4, P5, Tolerances)?; What is the difference between T & D1 or what is the designation for an oil hole? What is the designation for . DB arrangements have a large spread between the bearing centers and should be selected when a rigid shaft is required for the application.
Technical Data. NTN. PRECISION. ROLLING. BEARINGS. Main Spindle. Bearings. Ball Screw Support. Bearings. APPENDIX. NTN PRODUCTS Db. 2. Table 2.9 Fundamental tolerance IT. Classification of nominal dimension mm. Fundamental tolerance IT value μm over incl. 6. 10. 18. 30. 50. 80. 120. 180. 250. 315. 400.
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