Material:52100 Chrome Steel Construction：Cylindrical roller bearings, double row, super-precision Bore Type:Tapered K: Tapered bore, taper 1:12 SP: Dimensional tolerances to ISO class 5, geometrical tolerances to class 4 Weight:0.66KgMain Dimensions Bore diameter (d):60mm Outer diameter(D):95mm Width(B): 26mm Limiting rating Pu:12.7Kn Dynamic load ratings (Cr): 73.7KN Static load rating (Cor): 106KN Limiting speeds grease :9000 rpm Limiting speeds oil:10000rpm ABUTMENT DIMENSIONS Abutment diameter shaft (da)min.:66.5mm Abutment diameter housing(Da)min.:87mm Abutment diameter housing(Da)max.:88.5mm Oil nozzle position (not for variants with TNHA cage) dn:85mmThese bearings are therefore particularly well suited for machine tool spindles where the bearing arrangement must accommodate heavy radial loads and high speeds, while providing a high degree of stiffness, double row bearings are more suitable for heavier loads. Double-row cylindrical roller bearings have two structures: cylindrical inner bore and conical inner bore (the bearing rear code plus K). The conical inner hole can also play the role of micro-adjustment of the clearance, and can simplify the structure of the positioning device and facilitate installation and disassembly. Commonly used double row cylindrical roller bearings have the following types: NN series, NNU series, and NNF series.Tolerances: SP, UP, SP and UP for 1:12 tapered bore. NN3012KTN/SP Super-precision Double-row cylindrical roller bearing Suffix description K:Tapered Bore, Taper 1:12 TN: PA66 cage SP:Special Precision Class For Machine Tool Bearings: Dimensional Accuracy Approximately To P5, Running Accuracy Approximately To P4 Super-precision cylindrical roller bearings are characterized by: High speed capability High radial load carrying capacity High rigidity Low friction Low cross-sectional height
