SNR7211CDUJ74Angular Contact Ball Bearing – Straight Bore, 55 mm ID, 100 mm OD, 21 mm Width, Open, 15° Contact Angle, Light Preload.

Product Description

What this part is

SNR 7211CDUJ74 super-precision angular contact ball bearing, ISO 72 series, 55 x 100 x 21 mm. Brand: SNR. Manufacturer Part Number: 7211CDUJ74. Bearing Type: Angular contact ball bearing. Bore: 55 mm. Outside Diameter: 100 mm. Overall Width: 21 mm. Bore Type: Straight. Number Of Rows: 1. Rolling Elements: Ball. Closure Type: Open.

Decoding the designation

Contact Angle: 15°, carried by the C in 7211C. Preload: Light, carried by the J74 code. Precision Class: ISO P4, equivalent to ABEC 7. Cage Material: Phenolic. Series: 7200. Searchable forms of the designation: 7211CDUJ74, 7211-C-DU-J74, 7211 C DU J74, 7211-C-J74, 7211C.

What these specs mean in practice

A 15° contact angle favours speed and radial rigidity over thrust capacity, which suits a machine-tool spindle position. Light preload keeps the ball complement in contact under a modest set force, giving repeatable running accuracy with low heat generation. ISO P4 holds tighter bore, outside diameter and running accuracy than standard class, locating the shaft more closely and running with less vibration. The 72 series carries a heavier section than the 70 series on the same bore, so it takes more load in the same shaft position. The phenolic cage is light and quiet at speed.

Quantity and configuration

Unit Quantity: 1 Pc. One bearing from a factory matched pair, universally ground so it sets against a like bearing at the stated preload.

Interchange guidance

Cross-Reference 1: SKF 7211 CDGA/P4A. Cross-Reference 2: FAG B7211-C-T-P4S-UL. Cross-Reference 3: NSK 7211CTYNDULP4. Fafnir carton equivalent: 2MM211WI CR DUL. A same-envelope bearing at a different contact angle is a related size rather than a substitution.