RHP7208ETDUMAngular Contact Ball Bearing Duplex Pair — 40 mm ID, 80 mm OD, 18 mm Width, Open, 25°, Medium Preload, Phenolic Cage

Product Description

What this part is

A matched duplex pair of RHP 7208ETDUM angular contact ball bearings. Each bearing has a 40 mm bore, 80 mm outside diameter and 18 mm width, is open on both faces and runs a straight bore. The pair is universally ground with medium preload built in.

Decoding the designation

7208 identifies an angular contact ball bearing in the ISO 72 medium dimension series with a 40 mm bore. E sets a 25° contact angle in the RHP scheme. T denotes a phenolic cage. DU marks the bearings as a universally ground duplex set and the following M sets medium preload. P0 is the normal precision class, equivalent to ABEC 1. The carton also carries B7208X3TADUMEP1, which reads consistently in the RHP B-series scheme: X3 confirms the 25° angle and EP1 the normal class.

What these specs mean in practice

The 72 medium series is heavier in section than a 70 light series bearing of the same bore, so it carries more load in an 80 mm housing. A 25° contact angle gives greater thrust capacity and axial stiffness than a 15° bearing at a lower speed ceiling. Medium preload delivers more rigidity than a light-preload set with correspondingly higher friction. Normal class tolerances suit general machinery and pump service rather than precision spindle work.

Load and speed data

Dynamic and static load ratings, limiting speed and temperature limits are published in the specification table on this page.

Quantity and configuration

Two bearings, supplied as a matched universal duplex set. Each is single row and open, with no snap ring, seals or shields.

Fitting notes

Universal grinding allows assembly back-to-back, face-to-face or in tandem. A back-to-back or face-to-face arrangement locates the shaft axially in both directions and develops the built-in medium preload as the rings are clamped; tandem mounting shares thrust in one direction only. A single row alone takes thrust in one direction. The set is matched and stays together as supplied.

Interchange guidance

A substitution needs the same 25° angle, the same medium preload and the same normal class. A 7208 with a 15° or 40° angle, a different preload letter, or a P4 or P5 precision class shares the 40 x 80 x 18 mm envelope but is a related size rather than an equivalent.