RHP7208TSULP4Super-Precision Angular Contact Ball Bearing – 40 mm ID, 80 mm OD, 18 mm Width, Open, Phenolic Cage, Light Preload, P4

Product Description

What this part is

RHP 7208TSULP4 single-row super-precision angular contact ball bearing. Bore 40 mm, outside diameter 80 mm, width 18 mm. ISO 72 series, size 7208, straight bore, open both faces. RHP is a British maker, now part of NSK.

Decoding the designation

Cage Type: machined, outer-ring guided. Cage Material: laminated phenolic, from T, rated to 120 °C. Grouping: SUL, single universally ground to light preload. Precision Class: P4, equivalent to RHP EP7 and ABEC 7. Series: ISO 72. Base Number: 7208.

Specifications

Manufacturer: RHP (NSK). Part Number: 7208TSULP4. Base Number: 7208. Bearing Type: single-row super-precision angular contact ball bearing. Series: ISO 72 (7200). Bore: 40 mm (1.5748 in). Outside Diameter: 80 mm (3.1496 in). Width: 18 mm (0.7087 in). Bore Type: straight. Number of Rows: 1. Rolling Elements: steel balls. Cage Type: machined, outer-ring guided. Cage Material: phenolic, laminated fabric. Preload: light. Mounting Arrangement: universally matchable (SUL). Internal Clearance: N/A. Closure Type: open. Precision Class: P4 (RHP EP7, ABEC 7). Shaft Abutment Diameter (da): 47 mm minimum. Housing Abutment Diameter (Da): 73 mm maximum. Housing Fillet Radius (ra): 1 mm maximum. Chamfer (r): 1.1 mm minimum. Chamfer (r1): 0.6 mm minimum. Material: chrome bearing steel. Mass: 0.36 kg (0.80 lb). Maximum Temperature: 120 °C. Minimum Temperature: -30 °C. Design Units: metric. Harmonization Code: 8482.10.50.28. Country of Origin: United Kingdom.

What these specs mean in practice

A machined phenolic cage riding on the outer ring land runs light, damps well and holds up to 120 °C, which is why it is the standard super-precision spindle cage. Light preload removes play without adding much heat. P4 tolerances hold radial and axial runout tight, which shows up as lower running vibration and closer tool location on a spindle. Because the preload is ground into the ring faces, this bearing carries no radial internal clearance class.

Quantity and configuration

Unit Quantity: 1 Pc. One bearing, universally ground to light preload. Universal grinding lets it pair with any other bearing of the same designation back-to-back, face-to-face or in tandem, arriving at the ground preload with no spacer grinding.

Interchange guidance

The carton carries three schemes for this envelope: RHP 7208-T-SUL-P4, the RHP B-series form 7208TADUEP7, and the Fafnir cross MM208WICRDUL. SKF 7208 CDGA/P4A and FAG B7208-C-T-P4S-UL are 15° bearings on the same 40 x 80 x 18 mm envelope, so they are related sizes.