Barden NN3020KM SP51W33 Precision Cylindrical Roller Bearing – 100mm ID x 150mm OD x 37mm Width – New

The Beaver Precision NN3020KM SP51W33 is a double row cylindrical roller bearing designed for machine tool main spindle applications where high radial load capacity, rigidity, and running accuracy are required. Bore diameter measures 100 mm, outside diameter measures 150 mm, and width measures 37 mm, conforming to standard NN30 series dimensions for this size. The K suffix designates a 1:12 tapered bore that allows the user to set radial internal clearance precisely by drawing the inner ring up the tapered shaft. The M designation indicates a machined brass cage that is roller guided, suitable for higher rotational speeds and higher operating temperatures than polymer cages. SP class corresponds to ISO P5 dimensional accuracy and ISO P4 running accuracy. The W33 suffix indicates an annular lubrication groove and three lubrication holes in the outer ring, allowing relubrication during service without disassembly. The double row configuration places two rows of cylindrical rollers between a triple ribbed inner ring and a separable plain outer ring, providing high radial stiffness in a compact axial envelope. The outer ring is separable from the inner ring assembly, which simplifies mounting and dismounting in spindle housings. Typical applications include lathe spindles, milling machine spindles, grinding machine work heads, machining center spindles, and other precision rotating assemblies. The part number NN3020KM SP51W33 appears on the original Beaver Precision box label. Cross references include SKF NN3020 KTN9/SP, FAG NN3020 AS K M SP, NSK NN3020MBKRE44CC1P4, and NTN NN3020K.Stock # 0226-179