Timken Fafnir 2MM312WI DUL Super Precision Duplex Bearing Set - ABEC 9 - 60mm Bore - New in Box m00148

The Timken Fafnir 2MM312WI DUL is a super precision angular contact ball bearing matched set offered here as two factory sealed boxes. Each box contains a duplex DUL configuration (two universally ground bearings arranged for light preload), making this offering a total of two matched pairs. The 2MM designation indicates ABEC 7 (ISO Class 4) precision per the original Fafnir nomenclature, while the carton markings on the visible label also reference ABEC 9-MMV tolerance class with bore deviation of 5 micrometers and outside diameter deviation of 6 micrometers. The 312 size code places this bearing in the medium 300W series with a 60 mm bore, 130 mm outside diameter, and 31 mm width per Timken published reference data for this part number. WI construction provides full shoulders on both sides of the inner ring and a low shoulder on the outer ring, characteristic of standard angular contact ball bearings used in machine tool spindle applications. The CR suffix indicates a phenolic resin cage, and the DUL preload designation pairs the bearings with light preload for combined radial and axial load capacity in both directions when mounted face to face or back to back. Labels indicate the bearings were manufactured in the USA and tested per ABMA Standard 13. Typical applications include CNC machine tool spindles, high speed grinding spindles, precision turning centers, and ball screw support assemblies where stiffness, runout accuracy, and elevated rotational speed are required. Original factory shrink wrap and outer cartons are intact in the photos provided. Part number markings: 2MM312WI CR DUL.

Stock # 0226-148