RHP7216TDULP4Super-Precision Angular Contact Ball Bearing – 80 mm ID, 140 mm OD, 26 mm Width, Open, Light Preload, ABEC 7

Product Description

What this part is

RHP 7216TDULP4 super-precision angular contact ball bearing. Bore: 80 mm. Outside diameter: 140 mm. Width: 26 mm. Series: 7200. Base number: 7216. Single row, open, bearing steel rings and balls. The carton carries three designation schemes for the same bearing: RHP 7216 T DUL P4, RHP B-series 7216TDU EP7, and Fafnir MM216WI CR DUL. Searchable forms include 7216TDULP4, 7216-T-DUL-P4, 7216TDULP4-1/2PR, 7216TDUEP7, 7216B and MM216WICRDUL.

Decoding the designation

Contact Angle: Not specified. Cage: machined laminated phenolic, outer-ring land-riding, rated to 120 °C, from the RHP T and the Fafnir CR positions. Preload: light, from the DUL position. Precision Class: ABEC 7 / ISO P4, confirmed twice as P4 and as RHP EP7. Running accuracy, radial and axial runout: P4.

What these specs mean in practice

ABEC 7 tolerances give tighter running accuracy and lower running vibration than standard class, which is what holds a spindle on centre at speed. The machined phenolic cage is light, self-lubricating and quiet, and suits oil-mist and oil-air lubrication to 120 °C. Ground-in light preload removes shaft play and sets stiffness without shims or spring packs. Operating temperature: –30 to +120 °C. Mass: 3.20 lb.

Quantity and configuration

One bearing — a single half of a factory DUL duplex pair, which is what the -1/2PR marking on the carton records. It mounts as a single bearing, or pairs with a second piece of the same designation. Total width across a full DUL pair: 52 mm.

Fitting notes

Light preload is ground into the ring faces, so clamping the rings solid against the shaft shoulder and housing shoulder sets the preload. Because preload is ground in, this bearing carries no radial internal clearance class.

Interchange guidance

The 80 x 140 x 26 mm super-precision section is shared with Fafnir 2MM216WI-DUL and 3MM216WI-DUL, and with SKF 7216 CD/P4A and 7216 ACD/P4A, which are related sizes at 15° and 25° respectively. Matching on envelope, precision class, cage and preload gives a direct fit; the contact angle is selected to suit the spindle’s thrust and speed duty.