RHP7020CTDULP4Super Precision Angular Contact Ball Bearing – Matched Pair, Straight Bore, 100 mm ID, 150 mm OD, 24 mm Width, Open, 15° Contact Angle, Universal Light Preload

Product Description

What this part is

RHP 7020CTDULP4 is a matched pair of super-precision angular contact ball bearings. Each bearing measures 100 mm bore, 150 mm outside diameter and 24 mm width, giving 48 mm total width across the pair. Rings and balls are chrome bearing steel, the cage is machined laminated phenolic and both faces are open.

Decoding the designation

7020 is the ISO 70 dimension series with a 100 mm bore. In the RHP scheme C denotes a 15° contact angle, T a machined laminated phenolic cage guided on the outer ring, DUL a universally matchable duplex ground to light preload, and P4 ABEC 7 precision. The carton also carries the Fafnir designation 2MM9120WI CR DUL, whose 2MM prefix independently confirms the 15° angle and whose CR code confirms the phenolic outer-land-riding cage.

What these specs mean in practice

A 15° contact angle favours speed and radial stiffness over thrust capacity, which is why it is the usual choice for high-speed machine tool spindles. Light preload keeps heat generation and running torque low while still removing all internal play. The machined phenolic cage is light, quiet and tolerant of marginal lubrication, and is rated for continuous service to 120 °C.

Load ratings and speed

Basic dynamic load rating 95.0 kN and basic static load rating 77.0 kN, both per bearing. Limiting speed 9,200 rpm on grease and 14,000 rpm on oil. Approximate mass 1.27 kg per bearing.

Quantity and configuration

Two bearings. Universally matchable grinding allows the pair to be stacked back-to-back, face-to-face or in tandem, with the light preload established by the ground ring offset rather than by shims. A preloaded set carries no radial internal clearance, so clearance class does not apply.

Fitting notes

Rings are pressed on their own faces, never through the ball complement. Shaft and housing seats ground to the super-precision fit tables give the preload its intended value. Face marking lines are aligned when stacking so the intended arrangement is held.

Interchange guidance

SKF 7020 CD/P4ADGA, FAG B7020-C-T-P4S-DUL and NSK 7020CTRDULP4 share the envelope, the 15° angle and the light preload, and are direct equivalents. Fafnir 2MM9120WI CR DUL is the Timken equivalent. RHP 7020ETDULP4 shares the envelope and preload at a 25° angle, making it a related size rather than an interchange.