RHP7003CTDUMP4Super-Precision Angular Contact Ball Bearing Duplex Pair — 17 mm ID, 35 mm OD, 10 mm Width, Open, 15°, Medium Preload, Phenolic Cage

Product Description

What this part is:

A matched duplex pair of RHP 7003CTDUMP4 super-precision angular contact ball bearings. Each bearing has a 17 mm bore, 35 mm outside diameter and 10 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:

7003 identifies an angular contact ball bearing in the ISO 70 light series with a 17 mm bore. C sets a 15° 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. P4 is the precision class, equivalent to ABEC 7. The carton also carries 7003X2TDUMEP7, which reads consistently in the RHP B-series scheme: X2 confirms the 15° angle and EP7 the equivalent precision grade.

What these specs mean in practice:

A 15° contact angle favours speed and radial stiffness over thrust capacity, the standard choice for high-speed spindles and small precision drives. Medium preload gives more axial and radial rigidity than a light-preload set, at the cost of higher friction and heat generation, so it suits work where positional stiffness matters more than the last increment of speed. The phenolic cage is light and self-lubricating with a service ceiling around 120 °C.

Load and speed data:

Dynamic and static load ratings and the limiting speed 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 15° angle, the same medium preload and the same P4 or EP7 class. The light-preload 7003CTDULP4 shares this envelope and angle but carries a different preload, making it a related part rather than a substitute; the same applies to a 25° 7003 or a lower precision class. Cross-references: Fafnir 2MM9103WI-CR-DUM and NSK 7003CTRDUMP4.