Frequently Asked Questions | NTN Bearing
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? . Paired arrangements for angular contact bearings are designated as “D2” (universal flush ground pair), “DB” (matched back-to-back pair), “DF” (matched face-to-face 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. Part Number, Old Bearings Number, Brand, Bearing Type, Size(ID*OD*Width). AETNU305NU305, 32305 bearing, AET, CylindricalRollerBearings, 25mm*62mm*17mm. AETNU306NU306, 32306 bearing, AET, CylindricalRollerBearings, 30mm*72mm*19mm. AETNU307NU307, 32307 bearing, AET NTN 6304 Bearings,NTN 6304 Bearing Size And Price.